CA2097289C - Sheet stack and dispenser package therefor - Google Patents

Abstract

A stack (10) of individual pre-cut sheets (11) and a dispenser for those sheets are disclosed. The dispenser (20) affords reci-procating movement of the stack within the dispenser to afford individual dispensing of the sheets. Optionally, the dispenser (20) may be mounted on the wrist of a user to afford convenient dispensing.

Description

Sheet Stack and Dispenser Package Therefor Technical Field The=_ present invention relates generally to pre-cut lengths of pressure sensitive adhesive coated sheets for p joining one surface to another surface and dispenser packages for such sheets.
Background Art The art is replete with structures for adhesive coated sheets adapted to connect or join one surface to another surface. Tape from #810 MAGICTM brand transparent tape available from Minnesota Mining and Manufacturing Company, St. Paul, Minnesota i:~ used extensively for a variety of purposes and is conventionally dispensed from a roll of such tape on a ro:Ll type dispenser such as the dispensers disclosed in Walker et al. U.S. Patent Number 4,928,864 and Reinecke U.S.
Design Patenr_ 116,599. Such a roll of tape must be manually cut by cutting means which is located on the dispenser. It is difficult fo:r the user to manually cut precise, uniform lengths of the adhesive coated tape from the roll as it is difficult to repeatedly measure the=_ lengths precisely. Such a tape/dispenser combination is not suitable for situations which require quick and efficient dispensing of precisely uniform, pre-cut lengths of adhesive coated tape.
It is also known to dispense MAGICTM brand transparent

2~ tape from a pad of tape strips as described in Emmel U.S.
Patent 4,650,706. Emrnel discloses a pad of tape strips where the length of a tape tab :Formed at one end of each tape strip extending from one end toward an opposite end is progressively greater from one side of the pad to the other. Emmel teaches

3~ that separation of the tape strip with the longest tape tab may be accomplished by gras~p.ing the tape tab and peeling the strip from the pad without reparation of the next adjacent strip.
Thus, a person desiring a sheet must manually separate an edge of a top sheet from the rest of the sheets in the stack and peel that sheet away, which is inconvenient, particularly when only one hand is available to remove the sheet. Such a stack is not suitable for s=Ltuat;ions where the user requires the use of both hands for operations other than the dispensing of the tape, such as, for example, gift wrapping.
Mewtens U.S. Fat=ent 4,895,746 discloses a stack of adhesive coated sheet:, such as labels comprising release means and attachment means which provide means for easy release of the top sheen in the :tack of sheets. Mertens does not disclose placing the release means on alternating opposite edges of the sheets in the stack. Thus, similar to the tape strips taught by Emmel, a person desiring a sheet must 'manually separate an edge of a top sheet from the rest of the sheets in the stack and peel that sheet away, which is inconvenient, particularly when onl~r one hand is available to remove the sheet. Mertens also does not disclose a container for the adhesive coated sheet: adapted to enclose and protect the sheets.
Heretofore it i:~ known to provide a stack of partially adhesive coated sheets stacked with the adhesive coating along alternate opposite sides of the stack to thereby releasably adhere the sheets together. Such sheets may be conveniently dispensed from a container using only one hand.
Sheets from Post-itTM brand note pads and Post-itTM brand Tape FlagsTM available from. Minnesota Mining and Manufacturing Company of St. Paul, Minnesota are use extensively as such sheets. Post.-itTU brand Tape FlagsTM and an associated dispenser are disclosed in U.S. Patent 4,770,320 to Miles et al. Z-stacked sheets and associated dispensers are disclosed in U.S. Patents Loder 4,562,938; Loder 4,586,629; Smith

4,416,392; arid Merten:~ 4,653,666 and are also disclosed in EPO 399830. Such sheets are not suitable for joining or connecting a pair of ~~urfaces together, however, because relatively small percentages of such sheets are coated with repositionab7_e pressuz-e sensitive adhesive. Also, such sheets are not suitable for joining or connecting a pair of surfaces together because the pressure sensitive adhesive is a relatively weak adhesive, because some of the sheets are made of paper and easily become damaged, and because the sheets are at least partially opaque so that they obscure more of the joined surfaces than desired.
Disclosure of. the Invention The present invention provides a stack of pre-cut sheets coated with a relatively strong, aggressive adhesive that can be used to adhere two surfaces together. The ;tack of sheets has a large portion of each individual sheet coated with a relatively aggressive adhesive to provide secure engagement between two _oined surfaces, withstand relatively heavy handling without damage and yet provide an uppermost sheet which may be easily removed from the top of the stack and have its surface firmly adhered to a substrate along all of :its sides and edges, and c~o~es not obscure a significant part of the joined surfaces. The present invention is also directed to a simple, inexpensive arid effective dispenser for dispensing the flexible sheets from t:h~~ stack.
According to the present invention there is provided a stack of pre-cut sheets disposed one on top of another, each sheet comprising a backing having first and second opposite major side surfaces and first and second opposite ends with the first end of each sheet being in alignment with the second end 3a of an adjacent sheet in the stack, and a layer of adhesive permanently adhered to the first side surface of the sheet backing, the layer of adhesive of each sheet being releasably adhered along the second surface of the adjacent (lower) sheet in the stack. Each of: the sheets comprises release means for providing a f=first adhesion level along a first end portion of each of the sheets adjacent the first end of the backing between the layer of adhesive ~'20972~9 wv ~-~mu,snu ~crm~m;u~j~~ , and the second side surface of the adjacent (lower) sheet in the stack. The fixst adhesion Level provides a sufficiently low release force (e. g. preferably less than 50 grams par inch; 1.97 grams/mm) between the adhesive coating and the adjacent (lower) sheet to afford sliding movement between the aide surfaces of the adjacent ahBets along the first end portion. Attachment means are present for providing a second adhesion level along a second end portion of each of the sheets adjacent the second end of the backing between the layer of adhesive and the second side surface of the adjacent sheet in the stack to which the layer of adhesive is releasably adhered. The second adhesion level provides a release force (preferably between 4 and 15 ounces per inch; which is between 5 grams/mm and 17 grams/mm) that is higher than the low release force along the first end portion and firmXy adheres the sheet to the adjacent (lower) sheet in the stack during sliding movement of the sheet relative to the adjacent sheet along the ri.rst 2o end poztion while affording peeling away (e. g. manual) of the sheet along the second end portion.
The release means for providing the first adhesion level and the attachment means for providing the second adhesion level can comprise a variety of 2~ structures including, but not limited to one or combinations of (1) providing a uniform coating of the lama pressure sensitive adhesive an each of the sheets together with a coating of low adhesion backsize on the portion of the upper surface of each sheet only along 3o the first end portion, or providing different low adhesion backsixes on the upper surface of each sheet along the first and second end portions, with the low adhesion~backsize in the first end portion having the greatest release factor; (2) making the coating of ~S pressure sensitive adhesive along each of the sheets discontinuous along the first end portion and continuous along the second end portion, or discontinuous along both portions with greater discontinuities along the first end portion than slang the second; and/or (3) ~ .~ .....< . -...,.:_ '.- , _. ... J
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''. 2~ 9 ~2-89 W~ _ _ 10370 PC:1~/US4! /4R~ ~9 . , . .
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using different pressure sensitive adhesives along the two end portions. For example, a stack or the sheets may comprise a layer of adhesive coated over an entire first major side surface or the backing of each of the sheets, the attachment means may comprise a layer of medium release low adhesion backaize (L,AH) coated over at least a portion of the second major side surface adjacent the second end of the sheet, and the release means may comprise a layer of premium release low 1,Q adhgsivn backsize (LAB) coatBd over a portion Qf the second major side surface adjacent the first end of the sheet. In this example, the sheets in the stack may have a length along a longitudinal axis and a width along a direction perpendicular to the longitudinal axis of the stack. The layer of premium release low adhesion backsize (LAS) i~ continuous, extends from the rirst end a! the backing along the length of the sheet and comprises between ten (10) and eighty (80) percent of the area of a side or the backing of each sheet in the stack. Preferably the premium release low adhesion backsize (LAH} layer comprises generally about thirty-seven and one-half percent of the area of a side of the backing of each Sheet in the stack.
Generally, as used herein, "sheet material"
means a generally flat, flexible structure, preferably acetate, brightened acetate film, unbrightened acetate film, thermoset film, thermoplastic film, polyester, polypropylene, vinyl, paper, metal foil or combinations of the above mentioned materials. Preferably the sheet material is transparent to allow a user to sae the underlying substrate.
Low adhesion backsixe refers to a material which readily releases from a layer of pressure sensitive adhesive and includes, but is net limited to, silicones, fluorocarbons, acrylates, urethanes, chrome complexes, grafted or block siloxane hydrocarbons, and blends of these materials. examples of various low adhesion backsizes are found in U.S. Patents 4,421,904 to Eckberg et al.; 4,313,988 to Kpshar et al.; and 4,279,717 to Eckberg et al.. Other low adhesion backsizes which may be used according to t:he present invention are described in U.S. Patents 2,607,711 to Hendricks; 2,876,894 to Dahlquist;
and 2 , 532 , 011 to Dahlquist: et al .
Generally, as used herein, "premium release low adhesion backsize" means an adhesive/backsize interaction with a minimum release force of 100 grams per inch or lower, and "medium release low a<~hesion backsize" means an adhesive/backsize interaction with a release force of at least 150 grams per inch or higher.
The pressure sensitive adhesive may be of an acrylic, silicone, rubber-resin, or any other suitable composition. For example, the adhesive m.ay comprise acrylic adhesive IOA
(95%)/AA (4.50) Iso-octyl acrylate/Acrylic Acid. Adhesives for use with the present invention are described in U.S. Patents 4,699,842 to Jorgensem et al.; 3,578,622 to Brown et al.;
3,331,729 to Danielson et al.; 2,926,105 to Steinhauser et al.
and 4,835,21'7 to JorgE=n.sen et al. A relatively weak adhesive such as Acrylic Micro;~phe-res (IOA-ammonium acrylate) is also 2~ contemplated as an adhesive for use according to the present invention. For example, the relatively weak adhesive may be prepared according to L'.S. Patent 3,691,140 to Silver.
The dispenser o.f the present invention comprises walls having surfaces defining a cavity adapted to receive the stack. The walls include (1) a bottom abutment wall defining a bottom surface, (2) end walls defining end surfaces at opposite ends of the bottom surface and having generally parallel outer ends, and (3) arcuate wall portions generally opposite the bottom abutment wall e~a;ending generally toward each _2972$9 wO - ..... i~370 Pt';~'IU5~1-i08.t.b,9 , other from the outer ends and having spaced distal suds, the arcuate wall portions defining arcuate friction surface portions. Opposed outlet surfaces are provided at the distal ends and define an opening through the walls.
The arcuate friction surface portions and the bottom surface are shaped to afford reciprocating movement of the stack of sheets within the cavity in response to forces applied to the stack to sequentially io remove sheets from the stack through the opening, and to position the uppermost sheets of the stack adjacent the arcuate friction surface portions with the second end portion of the uppermost sheet i.n the stack projecting through the opening so that by grasping that second end z5 portion, the uppermost sheet in the stack can be manually pulled through the opening and will carry with it the second end portion of the sheet beneath it in the stack to which the uppermost sheet ie adhered by the adhesive coating, placing that second and portion in a 2o position where it also may be grasped and pulled to withdraw that sheet from the stack. The arcuate friction surface portions are further shaped to provide means for affording sliding movement of the adhesively joined first end portioh of the uppermost sheet and the 25 second end portion of they sheet beneath the uppermost sheet between the second side surface of a subsequent sheet in the stack and the adjacent arcuatB friction surface portion, and for making sufficient frictional engagement with the second aide surface of the sheet 30 beneath the uppermost sheet to restrict the movement of.
the sheet beneath the uppe~nost sheet between the rest of the stack and the adjacent arcuate friction surface portion to-thereby afford peeling Reparation between the uppermost sheet and the sheet beneath it after the 35 uppermost sheet is withdrawn cram the dispenser.
Brief Description of the prawing 2o97z$~
fVG _/10370 PCT/US'?t/OE~59 .

The present invention will be further described with reference to the accompanying drawing wherein like reference numerals refer to like parts in the several views, and wherein:
Figure lA is a sectional side view of a sheet in the first embodiment of stack according to the present invention;
Figure la is a sectional side view of a sheet in the first siabodiment of stack according to the present invention which includes a primer layer;
Figure iC is a top view of the sheet of Figure 1B showing first and second end portions;
Figurs 2 is a perspective view of a first embodiment of stack of sheets according to the present invention;
Figure 3A is a sectional side view of the first embodiment oL stack according to the present invention;
Figure 3B is a sectional side view of a second alternative embodiment of stack according to the present invention;
Figure ~C is a sectional side view of a third alternative embodi~aent of stack according to the present invention;
2s Figure 4 is a perspective view of a first embodiment of dispenaar container according to the preBent invention containing n stack of sheets also according to the present invention, and illustrating a weighted base far the dispenser;
Figure 5 is a sectional view of the dispenser, stack of sheets and base of the present invention shown in Figure 4 taken approximately along lines 5-5 of Figure 4;
Figures 6A-6D sequentially illustrate the movement of the stack, an uppermost sheet in the stack and a sheet beneath the uppermost sheet relative to the dispenser as the uppei-~most sheet is withdrawn from the dispenser illustrated in Figure 4 with the weighted base~~.~
omitted to show detail;

Figure 7 is a top view of the first embodiment of dispenser container according to the present invention;
Figure 8 is a top view of a second embodiment of dispenser according to the present invention;
Figure 9 is a sectional view of the second embodiment of dispenser according to the present invention taken approximately along 1_i_nes 9-9 of Figure 8;
Figure 10 i:~ a perspective view of a third alternative embodiment:: of dispenser container according to the present invention conl~aining a stack of sheets also according to the present invention;
Figure 11 i:~ a sectional view of the dispenser and stack of sheets of Figure 10 taken approximately along lines 11-11 of Figure 10;
Figure 12 is a ;sectional view of the dispenser and stack of sheets of Fi<~u.re 10 taken approximately along lines 12-12 of Figure 10, and.
Figure 13 is a representation of a test performed on the dispenser and sta~~k. according to the present invention.
2~ Detailed Description Referring now to Figures lA, 1B, 1C, 2, 3A and 6A
through 6D of the drawing, there is shown a first embodiment of a stack 10 (Figure 3A) of sheets 11 according to the present invention, each of which sheets 11 comprise a backing B having a coating of pressure ~;ensitive adhesive 2 on a first rriajor side surface 3 by which the sheet 11 may be adhered to a sheet beneath it in the stack. 10, a second major side surface 5, and opposite first 4 and second 6 ends with the first end 4 of each sheet backing in aligrLm~=nt. with the second end 6 of an adjacent sheet to form the stack 1Ø
Release means 8 provide a first adhesion leve:L along a first end portion 15 of each of the sheets 11 adjacent the

5 first end 4 of the backing B between the layer of adhesive 2 and the second side surface 5 of the adjacent (lower) sheet in the stack 10. The first adhesion level provides a sufficiently low release f=orce (e. c). preferably less than 50 grams per inch;
1.97 grams/mm) between the adhesive layer 2 and the adj<~cent 10 (lower) sheet: to afford sliding movement (e. g. see Figures 6A-6D) between the side surfaces 3, 5 of the adjacent sheets (e.g. the sheet 14 beneath the uppermost sheet and the sheet 16 below the sheet 14, Figure 6C) along the first end portion 15.
Attachment means 9 provide a second adhesion level along a second end portion 17 of each of the sheets adjacent the second end 6 of the backing B :between the layer of adhesive 2 and the second side surface 5 of the adjacent (lower) sheet in the stack to which the layer of adhesive 2 is releasably adhered.
The second adhesion level provides a release force (preferably between 4 and 15 ounces per inch; 5 grams/mm and 17 grams/mm) that is higher than the low release force along the first end portion 15 and firmly adheres the sheet (e.g. 12) to the adjacent sheet (~.g. 14) in the stack during sliding movement of t:he sheet (e. g. 14) relative to the adjacent sheet (e. g. 16, see Figure E>C) along the first end portion 15 while affording peeling away (e. g. manual) of the sheet (e.g :12) along the se<:ond end portion 17 (see Figure 6D).
Preferably, the layer of pressure sensitive adhesive is uniform, of the same adhesive composition, and has an adhesion to glass of 7_ess than 15 ounces per inch (17 grams/millimeter)., For example, the adhesive may comprise acrylic adhesive IOA(95%)/AA (4.5%) Iso-octyl acrylate/:~crylic Acid. Adhesives for use with the present invention are l0a described in U.S. Patents 4,699,842 to Jorgensen et al.;
3,578,622 to Brown et al.; 3,331,729 to Danielson et al.;
2,926,105 to Steinhauser et al., and 4,835,217 to Jorgensen et al.
Figure 1B is :~.imilar to Figure lA except that a primer 7 has been added to the second major side ffO 1037U PCT/U5Q1/08d69 , surface 5 of the backing H of the sheet 11.
Additionally, a primer (not shown) may be added to the first major side suxfaGe 3 of the backing H of the sheet 11. The primers are optional and where the release means 8 or the adhesive 2 does not naturally adhere to the sheet 11, primers known in the art raay be used without affecting the release perfonaanae o! the release means 8 or the adhesive 2.
Figure iC illustrates a generally rectangular sheet z1 having a longitudinal axis A defining a length L (preferably 2.0 inches, 5.08 centimeters) and a width w. The area of the~first end portion 15 of the sheet 11 Shawn in Figure 1C is the length Y (preferably 0.75 inches, 1.90 centimeter) of the release means 8 multiplied by the length Z (the width of the sheet, preferably 0.75 inches, 1.90 centimeters). The area of the second end portion 17 of the sheet 11 shown in Figure iC is the length X of the attachment means 9 multiplied by the length Z (the width of the sheet).
2o Generally, the first end portion 15 extends from the first edge 4 along the length of the sheet 11 and comprises between ten (10) and eighty (80). percent of the wren of a aide of each sheet 11 in the stack 10.
Preferably, the first end portion. l5 comprises generally about thirty-seven and one-half percent of the area of a side (fvr example 5) of the backing B of each sheet 11 in the stack. CorrespondingXy, the second end portion 17 extends from the e~econd edge 6 along the length of the sheet 11 and comprises between twenty (20) ~o and ninety (90) percent of the area of a side of the ' backing B of each sheet in the stack 10. Preferably, the second end portion 17 comprises generally about sixty-two and one-half percent of the area of a side oI
each sheet in the stack. It should De noted that the 3S sheet il shown in Figure iC is rectangular, however, various shapes are included within the scope of the invention including but not limited to square, circular, triangular and polygonal shapes and combinations thereof. ".
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:y... .~

209~'~~9 lfG _../10310 Y~"i/US9tlU$ih9 zn order to individually dispense a single sheet 11 from the stack 10 of sheets, the release means 8 should provide a release force of Iess than about 50 grams per inch (1.97 grams/mm) along the first end portion 15, and the attachment means 9 should provide a release force of greater than about 4 ounces per inch (5 grams/mm) and less than about 15 ounces per inch (1?
grams/mm) along the second end portion 17. If the release force of the release means 8 is too high (e. g.
greater than about 50 grams per inch), only one sheet will peel off the top of the stack 10 since the high release force would prevent the sliding movement of the two uppermost sheets 12, 14 in the stack 10 relative to the subsequent adjacent sheet 16 (For example, see Figures 6A-6D). If the release force of the attachment means 9 is too high (e.g. greater than 15 ounces per inch), it becomes difficult to peel the uppermost sheet 1Z from the sheet 14 beneath it and an undesirable "chaining" results wherein several sheets are 2o concurrently dispensed without separating. If the release force of the attachment means 9 is too lvw (e. g.
less than 4 ounces per inch), however, there is no sliding movement of the two uppermost sheets 12, 14 in the stack 10 relative to the subsequent adjacent sheet z5 16 since the uppermost sheet 12 would peel off the sheet i4 below the uppermost sheet before the sliding could accur. Preferably the release means 8 has a release force of about 2 grams per inch (.09? grams/mm) alone the fir6t end poxtion 15 and the attachment means 9 30 should provide a release force of about 4 ouncss per inch (5 grams/mm) along the second end portion 17.
Referring now to Figure 3A of the drawing, there is'shown an example of a first embodiment of a stack of sheets according to the present invention, 35 generally designated by the reference numeral 10. The ~Cack 10 of sheets 11 may comprise a layer of adhesive 2 coated over an entire first major side surface 3 of the backing B of each of the sheets I1, a first layer of medium release low adhesion backsize 1 (LA8) coated over a second major side surf=ace 5 of the backing B along at least the second en.d portion. 17 adjacent the second edge 6 of the sheet 11, and a second. layer of premium release low adhesion backsize 1' (LAB) coated over the second major side surf=ace 5 along the first end portion 15 adjacent the first edge 4 of the sheet 11. The backing i3 may comprise for example, an acetate backing as described in TJ.S. Patent 2,927,868. The sheets 11 are stacked with the premium release low adhesion backsize 1' (LAB) on each successive sheet disposed along alternative 1C opposite ends of adjacent sheet 11 in the stack 10 with the first end 4 of one sheet aligned with the second end 6 of the adjacent sheets and wi.tlz the adhesive coating 2 of one sheet releasably adhering the one sheet to the second major side surface 5 of a successive (lower) sheet to maintain the sheets 1~~ in the stack 10. It should be noted that while Figure 3A
illustrates t:he premium release low adhesion backsize 1' coated on top of the medium release low adhesion backsize l, the stack could be constructed with the premium release low adhesion backsize 1' coated directly to the second major side surface 5 2C> of the backing B of the sheet 11.
Ref=erring now to Figure 3B of the drawing, there is shown a second alternative embodiment of a stack of sheets according to the present invention, generally designated by the reference numeral l0A which has many parts that are essentially 25 the same as the parts of the stack 10 of sheets 11 and which have been identified by the same reference number to which the suffix "A" has been added.. In Figure 3B, the release means 8A
for providing the fir:~t adhesion level, and the attachment means 9A for providing the second adhesion level comprise 30 making the coating of pressure sensitive adhesive 2A on the 13a backing B of each of the sheets 11A discontinuous 18 along the first end portion 15A and continuous 18' along the second end portion 17A. Such a stack l0A may include only a single layer lA of low 1~'~ .~ ~~~ f~ . ~ ~'~~LJS91-~l8th.9 '. .. ~ ..

adhesion backsize along the second maker surface 5A of the backing B of sheet 11A. Alternatively the release means 8A for providing the first adhesion level, and the attachment means 9A for providing the second adhesion level may comprise making the coating of pre$sure sensitive adhesive 2A on the backing B of each of the sheets ilA discontinuous in both portions (not shown) with greater discontinuities in the first end portion 15A than in the second end portion 1?A.
Referring now to Figure 3C of the drawing, there is shown a third alternative embodiment of a stack of sheets according to the present invention, generally designated by the reference numeral 108 which has mt~ny parts that are essentially the same as the parts of the stack 10 of sheets 11 and which have been identified by the same reference number to which the sutrix "e" has been added. In Figure ~C, the release means 89 for providing the first adhesion level and the attachment means 9B for providing the second adhesion level 2o comprise changing the composition of the coating of pressure sensitive adhesive 2B along the first 15B and ~ the second 1'7B end portions. Like the stack loA, the stack lOB may include only a single layer iH df low adhesion backsize along the second major surface 5I3 of the backing a of sheet 11H. As an example of the stack loB, the adhesive 13 used along the first end portion i5B may be a relatively weak or low aggressive adhesive, such as described in U.S. patent 3,691,140 to Silver.
An adhesive that is particularly suitable for use along the first end portion 15B may comprise Acylic Adhesive or Acrylic microspheres. The adhesive 1s8 used in the second acLhesian zone 17a ~aay be a relatively aggressive or strong~adhesive, such as Acrylic Adhesive, Rubber resins, or Kraton. Adhesives for use with the present :~5 invention may be prepared t~ccording to U.s. Patents ~,699,8a2 to Jorgensen et al. and x,835,217 to Jorgensen et al.
The pre-cut sheets of the present invention are particularly useful for tasks which generally !209728 WC - '10370 FCi/US91/08IG9 require the use of both hands for operations other than the dispensing Qf the tape, such as for example, gift wrapping, wire marking and highlighting.
Referring now to Figures 4 through 7 of the 5 drawing, there is shown a first embodiment of dispenser according to the present invention generally designated by the reference numeral 20. The dispenser 20 is used in dispensing the flexible sheets from the stack (e. g.
10) also according to the present invention as described i0 above, The dispenser of the present invention comprises walls 22 having surfaces defining a cavity 23 which is adapted to receive the stack 10. Those walls 22 include a bottom abutment wall 24 defining a bottom 15 surface 24', end walls 25 defining end surfaces 25' at opposite ends of the bottom surface 24' and having generally parallel outer ends 26, and arcuate wall portions 28 generally opposite the bottom abutment wall 24 extending gensrally toward each other from the outer ends 26 and having spaced distal ends 29. Ths arcuate wall portions 28 define arcuate friction surface portions 28' which extend between the outer ends 26 and the distal ends 29.
Opposed outlet surfaces 32 are provided at the distal ends 29 and define an opening 34 through the walls 22. The arcuate friction surface portions 28' and the bottom surface 24' may be shaped to cause the stack 10 to be arched to thereby generally conform the upper surface of the stack to to the arcuate friction surface portion 28' of the arcuate wall portions 28. As illustrated in Figure 6A, the arcuate wall portions 28 are cylindrically concave about a pair of spaced axes A1, A2 parallel to the outer ends 26 and defining distinct radii RI, R2 of generally the same length (preferably 2.54 inches, 6.54 centimeters to the arcuate friction surface portion). The arcuate wall parti.ons 28 have an arc length of preferably about 1.75 inches (4.45 centimeters). The bottom abutment wall 24 may be arcuate, cylindrically concave about an axis A3 spaced _2497289 wo .~mo3~o 1~ rcmus~nos~m~ .
Prom the axes A1, A2 and defining a radius R3 (preferably 2.28 inches, 5.59 centimeters to the bottom surface) with the lateral distance D between the axis A3 and either axis A1 ar A2 preferably approximately .141 inches (.36 Centimeters) such that the width W oI the cavity 23 increases from the opening 34 toward the end walls 25.
Alternatively the arcuate wall portions 28 and the bottom abutment wall 24 could be Ilat planar elements formed by straight portians or a combination of straight or arcuate portions provided the overall effect is to position the uppermost sheets in the stack 10 proximate the arcuate friction surface portions 28' of the arcuate wall portions 28 and provides the function i5 described below during dispensing oL sheets 11 from the dispenser 20.
The arcuate friction surface portions 28' and the bottom surface 24' are shaped to afford reciprocating movement of the stack 10 of sheets within the cavity 23 in response to forces applied to the stack 10 to sequentially remove sheets from the stack through the opening 34, and to position the uppenaost sheets of the stack to adjacent the arcuate friction surface portions 2g' with the second end portian 17 of the..
uppermost sheet 12 in the stack projecting through the S
opening 34. Hy grasping that second end portion 17, the uppermost sheet 12 in the stack can be manually pulled through the opening 34 and will carry with it the second and portion 17 of the sheet 14 beneath it in the stack 3o to which the uppermost sheet 12 is adhered by the adhesive coating 2, placing that second end portion 17 in a position where it also may be grasped and pulled to withdraw that sheet 14 from the stack 10.
The arcuate friction surface portions 28' are further-shaped to provide means for affording sliding movement of the adhesively joined first end portion 15 of the uppermost sheet 12 and the second end portion 17 of the sheet 14 beneath the uppermost sheet between the second side surface 5 of a subsequent sheet 16 (Figure .. . .2097289 WO '10370 17 P'r'r,'US91608159 GC) in the stack 1o and the adjacent arcuate friction surface portion 28', and for making sufficient frictional engagement with the second side surface 3 of the sheet 14 beneath the uppermost sheet to restrict the movement of the sheet 14 beneath the uppermost sheet between the rest of the stack 10 and the ad~ttcent arcuate friction surface portion 28' to thereby afford pealing separation between the uppermost sheet 12 and the sheet 14 beneath it after the uppermost sheet 22 is to withdrawn from the dispenser 20 (sae Figure 6D).
The friction surface wall portions x8 and the bottom abutment wall 24 are ~paCed to define the cavity width W therebetween (Figure 6A) which, as a result of the spacing between the axis A3 and the axes Al and A2, increases from the opening 34 of the dispenser toward either end walls 25. This shape of the Cavity 23 has been found to be particularly suitable for causing the top two sheets in the stack 10 to form the shape shown in Figure 6C. This shape has been found to provide 2o efficient dispensing of the sheets. Also, the cavity 23 has an overall arc length generally defined by the length along the bottom abutment wall 24 which is greater than the length L of the stack 10 to afford the reciprocating movement of the stack 10 of sheets within the cavity 23. The cavity width W increases from the opening 34 of the dispenser 20 toward the end walls 25 to provide additional room in the cavity 23 near the end walls 25 to prevent buckling of the stack 10 as the uppermost sheet 12 is being dispensed, particularly when 3o the stack to is depleted to the last few sheets.
Buckling of the stack 10 causes undesirable consequences such as a loss of the remaining sheets in the Stack within the dispenser and damage to the sheets.
The use of a bottom sheet on the stack 10 that 3S is mare stiff than the other sheets 11 in the stack has been found to insure movement of the last few sheets 11 in the stack to positions adjacent the upper portion of the cavity 23 so that those last few sheets will be dispensed one at a time rather than all at once. The ~ 209?2~~
~C'r/ USp : /Q~; ~9 bottom sheet should not have any adhesive 2 adhered along its bottom surface to afford sliding movement along the bottom surface 24'.
The opposed outlet surfaces 32 at the spaced distal ends 29 of the arcuate friction surface portions 28' define the opening 34. The opposed outlet surfaces 32 era spaced proximate one another to provide peeling separation between the uppermost sheet 12 and the sheet 14 beneath the uppermost sheet and also prevent those sheets from being concurrently dispensed without separating. As best seen in Figure 7, the outlet surfaces 32 may include means in the farm of a plurality of ribs 37 extending from a di$tal end of one friction surface portion 28' toward the other far preventing the adhesive 2 of the sheets 11 from "wetting" the opposed outlet surfaces 32. when the opposed outlet surfaces 32 become "wet" with the adhesive, the opening 34 becomes clogged and it becomes difficult to dispense the sheets il as the adhesive z on the opposed outlet surfaces 3z zo causes the uppermost sheets in the stack 10 to adhere to the dispenser 20. Such action obstructs the passage of the sheets 11 through the opening 34.
The distance between a pair of ribs 37 located on opposite outlet surfaces 32 should be at least 0.060 inches (.15 centimeters) but not more than 0.25 inches (0.64 centimeters) and preferably .080 inches (0.20 centimeters). The spacing between a pair of ribs 37 located an opposite outlet surfaces 32 has bean found to be important and should be sufficiently wide to allow 3Q the uppermost sheet 12 and the sheet 14 beneath the uppermost sheet to pass through the opening 34 in the shape shown in Figure 6C without causing one portion of the adhesive coated first major side 3 of the backing B
of the sheet 14 beneath the uppermost sheet to contact another portion of the same side 3 of the sheet 14.
Such contact between portions of the same adhesively coated side 3 of the backing 8 of sheet 14 causes many undesirable results such as a pinching of the sheet ~.4 and a "chaining" effect whereby several preselected SUBSTITUTE SWEET

pg wa ~ io3~o P~fus~tio~~~~~ .

sheets are concurrently dispensed without separating.
The spacing between a pair of ribs 37 located on opposite outlet surfaces 32 should also be sufficiently narrow to afford peeling separation between the uppermost chest 12 and the sheet beneath the uppermost sheet l4 after the uppermost sheet 12 ht~s bean completely withdrawn from the dispenser 20 (e. g. Figure 6D). Should the spacing between the ribs 37 located on opposite outlet surfaces 32 be too wider, they entire to stack of sheets 10 may tend to be withdrawn from the cavity 23 when the user attempts to withdraw the uppermost sheet 11, particularly when the stack of sheets 1o is depleted to only a few remaining sheets.
The walls 22 of the dispenser 20 may be included in a unitary structure (e. g., a polymeric raolding of polystyrene, or a metal casting or a length of extrusion), and the arcuate wall portions 28 may include base portions 31 {Figure 7) adjacent the outer ends z5 and flexible cantilever portions 33 which extend 2o toward each other from the base portions 31 and toward the spaced distal ands 29. As shown in Figure 6B (cf.
Figure 6A), the flexible cantilever portions 33 deflect in response to forces applied to the stack 10 to remove the uppermost chest 12 from the stack 10. Making the flexible cantilever portions 33 flexible to afford such deflection decreases the amount of force required to remove the uppermast sheet 12 from the stack 10. It is believed that providing flexible cantilever portions provides a more desirable angle or orientation between the stack 10 and (1) the flexible cantilever portions 33 and (2) the opposed outlet surfaces 32 while the uppermost sheet 12 in the stack to i.s being dispensed.
The flexib'i~lity of the flexible cantilever portions 33 may be controlled by a variety of factors such as the length of the groove G dividing the arcuate wall portions 28 into the flexible cantilever portions 33 and the base portions 31, and the material used to construct the dispenser zo.
'~~'~~~~ 5~~~~T
SASS

,~ 20 g~~°~~
H-( ! ;/10370 ~C'I~/US?1/OE:59 , The end walls 25, the arcuate wall portions 28, and the opposed outlet surfaces 32, and the bottom abutment wall 24 extend transversely entirely through the dispenser 20 generally parallel to the axes A1, A2 5 and A3 so that the cavity 23 has an end opening 27 opening through a side 39 of the dispenser 20, through which end opening 27 the stack 10 may be i.nse7Ctable into the cavity 23. optionally, the di&penSer ZO may include a removable shield 44 adjacent the aide 39 and covering 10 the opening 27. The shield 44 provides protection for the stack 10 as it reciprocates within the cavity 23.
The shield 44 may be relaasably attached to the dispenser 20 by a pair of cylindrical mounting pins (not shown) integral with the shield 44 which may be press 15 fit into a pair of cylindrical apertures 45 defined by appropriately shaped surfaces in the dispenser 20 (See Figures 6A-5D). During use, the shield A4 may be removed to afford replacement of a depleted stack through end opening 27 and thereafter replaced on the 2o dispenser 20 to cover the end opening 27.
Figures 4 and 5 illustrate a weighted base 50 for use with the dispenser 20 and the stack IO of sheets according to the present invention. Means in the form of a close, tight friction fit between the outer surfacr~s z0 of the dispenser 2o and surface& defining a chamber 51. in the weighted base 50 taay be used to anchor the dispenser 20 to the weighted base 50. Preferably, the means for anchoring the dispenser 20 to the weighted base 50 should be releasable to afford removal of the dispenser 20 from the weighted base 50 to thereby afford replacement of a depleted stack 10 of sheets.
Alternatively, along with a friction tit, the means for anchoring' the dispenser to the weighted base 50 may comprise one or more flanges (not shown) integral with the weighted base and extending laterally adjacent a top portion of the dispenser when the dispenser is loaded into the weighted base portion. The flanges each may include detent means adapted to fit into surfaces defining grooves (not shown) located along a top portion ~ _, ~>,_ , .q.. s ~
~ ' : 's.v ~. ~ a i i WC ~ /10370 '1 F~f/:JS~1/C8I69 , of the dispenser to releasably retain the dispenser within the weighted base.
As illustrated in Figure 5, the weighted based 50 may further includs walls defining e~ xeplace~ment stack supply chamber 52. The replacement stack supply chamber 52 may be used to store additional replacement stacks R prior to their use.
The weighted base 50 may include two separate pieces including a base portion 53 and an upper portion 5~ having wallB defining a hollow 55. The base portion 53 is adapted to be detached i~om the upper portion 54 to provide means for filling the hollow 55 with ballast 56 such as sand, gravel or rocks. The base portion 35 may be snap-tit, glued, heat sealed or ultrasonically welded to the upper portion 54 to provide the weighted base 50.
The dispenser 20 of the present invention need not include the weighted base 50 and instead the dispenser 2o may include means in the form of rectangular foam pads (not shown) adhered to a base surface 41 of the dispenser 20 and having a costing of pressure sensitive adhesive on their surfxcese opposite the base surface 41 that may prior to use be covered with a release liner (not shown) for adhesively anchoring the dispenser 20 to a substrate.
Alternatively, the dispenser 20 may include a magnet (not shown) adhered to the base surface 41 for magnetically anchoring the dispenser 20 to a metal substrate.
3~ Referring now to Figures 8 arid 9 of the drawing, there is shown a second alternative embodiment of dispenser according to the present invention, generally'designated by the reference numeral 40 which has many parts that are essentially the same as the parts of the dispenser 20 and which have been identified by the same reference number to which the suffix "A" ha$
been added. The dispenser 40 is generally identical to the dispenser 20 except that the dispenser 40 further includes means in the form of lead-in guides 42 located 20972~~
1~'f'~"~'Z/ I Oa70 ?,~ t"~ T/'JS91/E~8169 , ~ _ , . ' adjacent the end opening 27A for assisting in the loading of a replacement stack 10 of sheets ih the cavity 23A when the existing supply of sheets 11 is depleted. The lead-in guides 42 era located adjacent the aide 39A of the dispenser 40 that includes the and opening 27A. There is no shield in the embodiment shown in Figures 8 and 9.
Referring now to Figures 1o through 12 of the drawing, there is shown a third alternative embodiment l0 of dispenser according to the present invention, generally designated by the reference numeral 1G0. The dispenser 10o is used in dispensing the rlexible sheets from the stack (e. g. 10) also according to the present invention as described above. The dispenser 100 is particularly suitable for uses where the user requires the use of both hands for operations other than the dispensing of tape, such as in gift wrapping, wire marking and highlighting.
Like the dispenser 20, the dispenser 100 zo comprises walls 122 having surfaces defining a cavity 123 which is adapted to receive the stack 10. Those walls 122 include a bottom abutment wall 124 defining a bottom surface 124', end walls 125 defining end surfaces 125' at opposite ends of the bottom surrace 124' and having generally parallel outer end$ 126, and arcuate wall portions 1Z8 generally apposite the bottom abutment wall 124 extending generally toward each other from the outer ends 126 and having spaced distal ends 129. The arGUate wall portions 128 define arcuate fx'iCtion surface portions 128' Which extend between the outer ends 126 and the distal ends 1.29.
The bottom abutment wall 124 extends between lower end's.121 of the end walls 125 which ors located opposite and spaced from the outer ends 126. The walls 122 of the dispenser 100 may be included in a lightweight, unitary structure (e. g. a polymeric molding of polystyrene) with the bottom wall 124 attached to the rest of the dispenser 100 by an integral hinge 130 adapted to mount the bottom wall 124 far pivotal 2097~~9 _ _ ~ ~. .. . . ... ~~v a.~w !JY Jl. 1W 7G~ ' G~.
V~'O yt/10370 ,~3 PCT/US91/08169 movement with respect to the friction wall portions 128 between an open position (Figure 12 dashed lines) atfording access to the cavity 123 to replace a depleted stack and a closed position (Figure 12 solid lines) with the stack of sheets 10 enclosed within the cavity 123.
Such a configuration is referred to as a "bottom loading" dispenser. It should be noted that the first and second embodiments of dispenser discussed above may also be modified to become "bottom loading" dispensers by hawing their bottom wall portions pivotally hinged with respect to the rest of the dispenser.
At the ride of the bottom wall 124 opposite the hinge i3o, the dispenser loo may include one or more hooks 139 adapted to engage a flange 138 extending laterally from the dispenser 100 to retain the bottom wall 124 in the closed position.
An integral wristband 136 may be attached to the dispenser 100 adjacent both end walls 125 tv afford convenient mounting of the dispenser 100 to the wrist o:
a user. Means 131 in the form of cylindrical mounting ribs 133 adapted to be press fit into apertures 135 may be provided to afford adjustment of the wXistbarid 136 to accommodate wrists of various sizes. The means 131 may comprise any suitable attachment structure such as, but not limited to, hook and loops, a clamp or a spring wristband.
Opposed outlet surfaces 132 are provided at the distal ends 129 and define an opening 134 through the walls 122. The arcuate friction surface portions 128~ and the bottom surface 124' may be shaped to cause the stack 10 to be arched to thereby generally conform the upper ~aurface of the stack 10 to the arcunte friction surface portion iZ8' of the areuate wall portions 128. as illustrated in Figure 11, the friction 3S surface portions 128 arid tile bottom wall 124 ate cylindrically concave about an axis A10 parallel to the upper ends 126 and defining radii R10 (preferably 1.25 inches, 3.17 centimeters inner diameter with an arc length of 3.5 inches, 8.9 centimeters) and R20 1'V~, ~2/t03~U 24 PCT/US911O81G9 .
(preferably 1.47 inches, 3.7 centimeters inner diameter with an arc langt2i of 3.66 inches, 9.3 centimeters).
Alternatively the friction surface portions 128 and the bottom abutment wail 124 could be flat planar elements formed by straight portionec or a combination of straight ar arcuate portions provided the overall effect is to position the uppermost sheets in the stack 10 proximate the friction surface wall portiana 128 and provides the function described below during dispensing of aheeta~ 11 from the dispenser 100.
Unlike the dispenser 20, the friction surface wall portians 128 and the bottom abutment wall 124 of the dispenser 100 are spaced to define a generally uniform cavity width W therebetween (Figure 11).
Like the.dispenser 20, the cavity ix3 has an overall surface length generally defined by the length along the bottom abutment wall 124 which is greater than the length L of the stack 10 to afford reciprocating movement of the stack 10 of sheets within the cavity 123 2o in response to forces applied to the stack to sequentially remove sheets 11 from the stack 10 through the opening 134. The arcuate friction surface portions 128' and the bottom surface 124' of the dispenser 100 are shaped to afford reciprocating movement of the stack l0 of sheets within the cavity 123 in response to forces applied to the stack 10 to sequentially remove sheets from the stack through the opening 134, and to position the uppermost sheets of the stack 10 adjacent the arcuate friction surface portions 128' with the second end portion 17 of the uppermost sheet 12 in the stack projecting through the opening 134. By grasping that end portion 1?, the uppermost sheet 12 in the stack can be manually pulled through the opening 134 and will carry with it the second end portion 17 of the sheet 14 beneath it in the stack to which the uppermost sheet 1z is adhered by the adhesive coating 2, placing that second end portion 1~ in a position where it also may be grasped and pulled to withdraw that sheet 14 from the stack 10.

W0 9.., 10310 ~5 PCT/L1S91/081b9 .
The opposed outlet surfaces 132 at the spaced distal ends 229 of the Friction surface portions 128 define the opening 134. The opposed outlet surfaces 132 are spaced proximate one another to provide peeling separation between the uppermost sheet 12 and the sheet 14 beneath the uppermost sheet and also prevent the uppermost sheet and the sheet beneath the uppermost sheet from being concurrently dispensed without separating. As best seen in Figure 12, the outlet surfaces 132 may include means in the form of a plurality of ribs 137 extending from a distal end of one friction surface wall portion 128 toward the other for preventing the adhesive 2 of the sheets 11 Irom "wetting" the opposed outlet surfaces 32, the distance between a pair of ribs 137 located on opposite outlet surfaces 132 should be at least 0.060 inches (.15 centimeters) but not more than 0.25 inches (0.64 centimeters) and preferably .080 inches (0.20 centimeters).

A stack of sheets of the type described with reference to Figure 3A were. made as follows. Example 'S (1) was prepared by coating a 2.0 Mil 6 inch (15.24 centimeter) wide brightened acetate film with a medium release Low Adhesion Back$ize (LAB) octyl-Decylacrylate/Methyl- Acrylate/Acrylic Acid (known as t~ Terpolymer) with the following monomer ratios:
(54/31/15) at 5% solids in Toluene. The medium release LAB was applied with a 250 Ruling Mil knurled rotogravure' and dried at lso degrees Fahrenheit, 65 degrees Celsius. The matte (second) side of the acetate film was coated with the medium release LAB along the ~S entire second side surface. The acetate Iilm Was then stripe coated with a premium release Low Adhesion Backsize (LAB) GE-9300 Epoxy silicone U.V, polymer commercially available from GE Silicones 260 Hudson River Waterford, NY 12188. The GE-930p premium release ~ 2 0 9~7 ~~
wc. Imo3~o z6 PGTlUS91/~1816~r , Epoxy silicone wasp applied by using a 3 tall U.V.
coater. The application roll used was a polyurethane rubber roll with i inch wide raised edges to produce a stripe 1 inch (2.54 centimeters) w#.de. The stripe was located 0.25 inches (.63 centimeters) off each edge of a 6 inch (15.24 centimeters) wide roll of acetate film.
The acetate film was then primed over the first mayor side surface with an acrylate primer at 5% solids in toluene. The primer was applied using a ratogravura io 12o-pyramidal knurled roll and dried at 150 degrees Fahrenheit, 65 degrees Celsius. The premium release low adhesion backsize (Epoxy silicone LA.B) was applied on tap op the medium release LAB. This created the desired differential release system for dispensing fully adhesive coated sheets, a$ discussed above.
The adhesive comprises 95% Iso-Octyl Acrylate 45% Acrylic acid as a solution copolymer 55% solids.
The adhesive was t~pplied to the first side surfaces at 4 grains/4 inch x 6 inch. The adhesive may be prepared, for example, as described in U.S. patent 4,699,842 to Jorgensen et al. The pressure sensitive adhesive was applied using a fluid bearing die and dried at 150 degrees Fahrenheit, 65 degrees Celsius. The acetate backing was then slit in 3 inch (7.62 centimeters) stockrolls and z-stacked into a pad of sheets. The pads contain 5a to 73 sheets of fully coated material .75 inch (1.9 centimeters) wide and Z inch (5.08 centimeters) in length.
brag force measurement. The stack of sheets of the type described with reference to Figure 3A Was placed in a dispenser of the type described with reference to Figures 4, 5, 6A through 6D and 7. Drag force measurements were made an the pads using the fallowing test procedure: The pad is placed in the dispenser as shown in Figure 6A and the dispenser is attached to a l00o gram weight metal block using adhesive backed material. The metal block is then placed on the base of a (DFG-2) DIGITAL FORCE GRAM GAUGE
commercially available from Servca 6100 Blue Circle .209?2..~
WO . 10370 ~ 7 PLT/US91 /9S 169 Drive, Minnetonka, MN. The base is raised to a height of 0 to 4 inches (7.62 centimeters to 10.16 centimeters) and the uppermost tape strip is attached to a clip extended from the gauge. The base is then allowed to drop in frBe fall under the force of gravity. As the base falls one 0.75 inch x 2 inch (1.9 centimeters x 5.0 centimeters) piece of tape is dispensed from the dispenser. The procedure is repeated until all sheets in the pad are dispensed. Each sheet contains a medium release length X (see Figure iC) of 1.25 inches (3.2 centimeters) and a premium release length Y (see Figure iC) of 0.75 inches (1.90 centimeters). The results for example-1 appear in Table-1. The resultant force being pneasured is the total drag force or peak drag force to dispense one, sheet from the dispenser. It is believed that the drag force actually measures two forces: (1) the force to dispense the uppermost sheet 12 from the dispenser 20 and (2) the force to peel the uppermost sheet 12 from the sheet 14 beneath it (see Figure 6D).
The entire pad is dispensed to determine how the peak drag force is changing throughout the pad stack. This is illustrated in a graph of examples 1-4 in Figure 13.
Example-2 was prepared in the same manner as example-1 except 2.0 Mil unbrightened acetate was used and the medium release low adhesion backsize composition was octyl-oecylacrylate/Methyl Acrylate/ACrylic Acid 50/45/5. The testing procedure fox example 2 is the same as the testing procedure for example 1 and the results appear in Table-2.
3o Example-~ was also prepared in the same manner as examples 1 and 2 except that the medium release low adhesion b~_cksize (LA)3) was of the following composition: Octyl-decyl Acrylate/methyl Acrylate/Acrylic Acid at the following monomer ratios:
57/31/12. The drag force results appear in Table-3.
For all examples the mean, medium, minimum, and maximum total drag forces are provided. A minimum drag force of about 180 grams is necessary to dispense SUBSTITUTE St~EET

w' . z~ ~ 037o Pcrn~s9=_ ~os~s~ .

the pads in the dispenser shown in Figure 6A-6D (Figure 13) .
The preferred drag force is between 300 to 500 grams. These drag forces era critical to the tunction of the pad in the dispensary. The function of the stack and the dispenser are dependent upon the proper combination of medium release LAB's and premi.u~oa release T~A.B~s discussed above. In example-1 the mean drag force is 304 grams, the median is 328 grams, minimum is 253 to grams, and the maximum is 403 grams. Generally, there are two types of failures. A failure occurs when the subsequent sheet does not pop out of the dispenser during the drag forts test. A second failure occurs when multip7.e sheets are concurrently dispensed without separating.

2097.89 \'VU 9_ .U37U tsCT/tr91/38t69 , T7~BLE 1 FORCE FORCE FORCE
SAMPLE ~ _( GRAMS SAMPL E ~( GRAMS5~1.~E ,~ GRAMS
) ~ ) ~ ) 2 287 27 277 52 3?2 FAIL

6 274 31 307 56 327

7 300 32 277 57 371

8 293 33 341 58 378

9 254 36 269 59

10 253 35 288 60

11 254 36 269 61

12 270 37 300 62

13 267 38 296 63

14 280 39 365 64

15 300 40 403 65

16 253 41 265 66 ?.5 17 263 42 342 6?

7.6 268 43 349 68 MEAN. . . ... . . 304 STANDARD . .
. . . DEVIATION. 38 MEDIAN. . . . . . 328 NUMBER OF SAMPLES . .
. . . . 58 MINIMUM . . . . . 253 NUMBER OF FAILURES. . .
. . . .2 MAXIMUM . . . . . d03 NUMBER OF MULTIPLES . .
. . . .0 .Hr r ;";% lr i/~''i ~"' 'r'''J'~.j~~ j 1 '~.~J

~ 2097x89 1~G _/ 10370 3o x'CT/U3911~8169 BACKSHEET . . . . . .14 mil POLYESTER
BACKING . . . . . . .2.0 mil BRIGHTENED ACETATE FILM
PRIMER. . . . . . . .PH-167 APPLIED WITFI A 120 PYRAMI DAI
MEDIUM RELEASE LAB. .TER.POLYMER ODA/MA/AA 54/3I/15 PREMIUM RELEASE LAB .G.E. EPOXY SILICONE 9300 3~
CATYLIST
CATALYST. . . . . . .G.E. 9310C 3~
ADHESIVE. . . . . . .ISO-OCTYLACRYLATE/ACRYLIC ACID
95/4.5 4.0 GRAINS/4"X6" (24 inches square) ;i ':..
.:: .
r '~ y.~.

~.Zpg wo s ~. , 0370 rcrm~pm~~b9 .

FORCE FORCE I~ ORCE
SAMPLE j"~~RAMS ,SAMPLE ~' ,~G~ SAMPLE ~' f C
~' 1 1 x22 26 253 51 214 s 234 31 241 5s .~o 8 23? 33 2Z0 58 241 Z27 40 247 6b 16 2.40 41 249 66

17 237 42 230 67 19 243 ~i4 230 69 21 239 4fi 237 71 22 260 47 209 7~

MEAN. . .. .- . . 235 STANDARD . . .
. . DEVIATION 15 .

MEDIAN. .. . . . . 250 NUMBER SAMPLES . . .
. OF . 60 MINIMUM . .. . . . 209 NUMBER FAILURES . . .
. OF . 0 MAXIMUM . . .. . . 290 NUMHFrFt MUL2'IPLES.. . .
. OF 0 ~,~09~28~
H'U : ~/ 10370 t'C'T/L~591108169 BACKSHEET . . . . . .14 mil POLYESTER
BACKING . . . . . . .2.0 mil BRIGHTENED ACETATE FILM
PRTME,R. . . . . . . .PFi-16? APPLIED WITH A 120 PYRAMIDAL
MEDIUM RELEASE LAE. TERPOLYMER Mc-a86 ODA/MA/AA

PREMIUM RELEASE LA.B .G.E. EPOXY SILICONE 9300 3~
CATYLIST
CATAIrX6T. . . . . . .G.E. 9310C 3~
ADHESIVE. . . . . . .ISO-OCTYLACRYLATE/ACRYLIC ACID
95/4.5 4.0 GRAINS/4"X6" (24 inches square) ,gyp ~ __ U37U PCT/USQI/QR169 FORCE FORCE FORCE
S~'jpLE j G~S_1. SAMPL E # jGRAM S 1 SAMPLE ! GRAMS
~ # 1 4 309 29 258 5d 199 5 303 30 258 55 337.

11 287 36 26? 61 14 299 39 286 &4

18 258 d3 327 68

19 286 44 279 69

20 297 45 249 70

21 288 46 271 71

22 312 47 313 72

23 288 48 241 73

24 307 49 254 74 2S 309 50 2B4 ?5 MEAN. . . . : . 282 STANDARD . .
. . DEVIATION. 27 . .

MEDIAN. . . . . 279 NUMBER SAMPLES . . . .
. . OF . 57 MINIMUM . . . . 199 NUMBER FAILURES. . . .
. , OF . 0 MAXIMUM . . . . 359 NUMBER MULTIPLES . . .
. . OF . 0 209~~
wo . 1030 3~ PCT/U591/ORlh9 .

BACKSHEET . . . . . 14 Iail POLYESTER

BACKING .. . . . . . Z.0 mil BRIGHTENED ACETATE FILM

PRIMER. .. . . . . . PH-167 APPLIED WITH A 120 PYRAMIDAL

MEDIUM RELEASE LAB . R1-8705 ODA/AA/MA 5?/12/31 APPLIED

PREMIUM RELEASE LA.B. G.E. EPOXY 9300 SILICONE

CATALYST. . . . . . .G.E. 9310C 3t ADHESIVE. . . . . . .ISO-OCTYLACRYLATE/ACRYLIC ACID

95/4.5 @ 4.0 GRAINS/4"X6~ (24 inches square) _2097289 w-o : ~o:~~o r~~riU~oliot~~s9 .
T7LeI,R 4 5,,~~ 1GRAMS1 SAMP LE ~ lGI3 A~ (GRAMS' SAMPLE ~

, 10 3 251 28 277 "~3 246 5 257 30 262 55 ~ 257 6 2!36 31 237 56 313 2~ 18 243 43 266 68 24 2?9 49 259 74

25 21S 50 299 ?5 MEAN.. . . .~. . STANDARD DEVIATION. . . . 24 . 263 .

35 MEDIAN . . . . . NUMBER SAMPLES . . . . 58 . 266 OF .

MINIMUM. . . . . NUMBER FAILURES. . . . 0 . 214 OF .

MAXIMUM . . . . NUMBER MULTIPLES . . . 0 . 31B OF .

we ua3~o ;'[T/US91.'~$1~9 , S~ARY EXAMPLE 4 HACXSHEET . . . . . .14 mil POLYESTER
BACKING . . . . . , 2.0 mil UNBRIGHTENED ACETATE FILM
PRIMER. . . . . . . PH-167 APPLIED WITH A 120 PYRAMIDAL
MEDIUM RELEASE LAH. .TERPOLYMER ODA/MA/AA 54/34/12 PREMIUM RELEASE LAH .G.E. 9300 EPOXY SILICONE 9340 3~ CATYLIST
CATALYST. . . . . . .G.E. 9310C 3~
ADHESIvE. . . . . . .ISO-OCTYLACRYLATE/ACRYLIC ACID
95/4.5 @ 4.0 GRAINS/4~~X6~~ (24 inches square) Release force measurements of differential release system: This test method measured the release force required to separate the pressure sensitive 2o adhesive coating on one sheet =rom the medium release low adhesion backsize and the premium release coated surfaces of the underlying sheet. A 3 inch Wide stuck roll was used for each example 1-4. A sample of each stock roll is adhered to a platform on a constant rate extension device, next a 1 inch x 3 inch sample of one of the stock rolls is adhered to the medium release low adhesion backsize (LAB) and peeled otf the top sheet at ~so degrees by moving the platform at a speed of 229 cm/min in a direction parallel to the surfaces of the 3o two attached sheets. The average force required to remove the sample from the medium release LAB and premium release LAB is reported as the release force value of tie sheet tv the LAB. For examples 1-4 the results are shown in Table-5.

~_zos~?.~.s WO 9.., 10370 PCT/U~~t/CE:69 Table-5 Example Release force Relaase force MEDIUM LAB PREMIUM LAH
s grams/ grams/ grams/ grams/
inch centimeter inch centimeter 1 128 50.4 4 l.s 2 150 59 6 2.4 3 100 39.4 4 2.4 4 I40 55 4 Z.4 1~ The present invention has now been described with reference to several embodiments thereof. It will be apparent to those skilled in the art that many changes or additions can be made in the embodiments described without departing from the scope of the 2o present invention. Far example, a release liner may be utilized to produce a differential release pad. Also, pattern coated low adhesion backsizes and adhesives may be used to produce the desired results. Known corona treatment of silicones may also be used to produce the ?5 desired release characteristics in the pad. Thus, the scope of the present invention should not be limited to the structures described in this application, but only by structures described by the language of the claims and the equivalents of those structures.

Claims (43)

1. A dispenser (20; 40; 100) for flexible sheets from a stack (10; 10A; 10B) of pre-cut sheets (11; 12, 14, 16) disposed one on top of another, each second (5) opposite major side surfaces and first (4) and second (6) opposite ends with the first end (4) of each sheet being in alignment with the second end (6) of an adjacent sheet in said stack (10), and a layer of adhesive (2) permanently adhered to the first side surface (3) of said sheet backing (B), the layer of adhesive (2) of each sheet (11; 12, 14, 16) being releasably adhered along the second side surface of the adjacent sheet in said stack (10), said sheets comprising release means (8; 8A; 8B) for providing a first adhesion level along a first end portion (15) of each of said sheets (11; 12, 14, 16) adjacent said first end (4) of said backing (B) between said layer of adhesive (2) and the second side surface of the adjacent sheet in the stack to which said layer of adhesive (2) is releasably adhered, which first adhesion level provides a sufficiently low release force between said adhesive coating layer (2) and the adjacent sheet to which the adhesive is releasable adhered to afford sliding movement between the side surface (3 and 5) of the adjacent sheets (14 and 16) along said first end portion (15), and attachment means (9; 9A; 9B) for providing a second adhesion level along a second end portion (17) of each of said sheets (11: 12, 14, 16) adjacent said second end (6) of said backing (B) between said layer of adhesive (2) and the second side surface (5) of the adjacent sheet in the stack (10) to which said layer of adhesive is releasably adhered, which second adhesion level provides a release force that is higher than said sufficiently low release force along said first end portion (15) and firmly adheres the sheet (12) to the adjacent sheet (14) in the stack during sliding movement of the sheet (14) relative to the adjacent sheet (16) along said first and portion (15) while affording peeling away or the sheet (12) from the stack (10) along said second end portion (17), the dispenser (20; 40, 100) comprising:
walls (22) having surfaces defining a cavity (23) adapted to receive the stack (10), said walls (22) including;
a bottom abutment wall (24) defining a bottom surface (24'), end walls (25) defining end surfaces (25') at opposite ends of said bottom surface (24') and having generally parallel outer ends (26), arcuate wall portions (28) generally opposite said bottom abutment wall (24) extending generally toward each other from said outer ends (26) and having spaced distal ends (29), said arcuate wall portions defining arcuate friction surface portions (28'), opposed outlet surfaces (32) at said distal ends (29) defining an opening (34) through said walls (22), said arcuate friction surface portions (28') and said bottom surface (24') being shaped to afford reciprocating movement of the stack (10) of sheets within the cavity (23) in response to forces applied to the stack (10) to sequentially remove sheets (12,14, 16)~from the stack through said opening (34), and to position the uppermost sheets of the stack adjacent the arcuate friction surface portions (28') with the second end portion (17) of the uppermost sheet (12) in the stack projecting through the opening (34) so that by grasping that second end portion, the uppermost sheet (12) in the stack can be manually pulled through the opening (34) and will carry with it the second end portion (17) of the sheet (14) beneath it in the stack to which the uppermost sheet (12) is adhered by the adhesive coating layer (2), placing that second end portion (17) in a position where it also may be grasped and pulled to withdraw that sheet (14) from the stack, said arcuate friction surface portions (28') being shaped to provide means for affording sliding movement of the adhesively joined first end portion (15) of the uppermost sheet (12) and the second end portion (17) of the sheet (14) beneath the uppermost sheet (12) between the second side surface (5) of a subsequent sheet (16) in the stack and the adjacent arcuate friction surface portion (28'), and for making sufficient frictional engagement with the second side surface (5) of the sheet (14) beneath the uppermost sheet to restrict the movement of the sheet beneath the uppermost sheet between the rest of the stack (10) and the adjacent arcuate friction surface portion (28') to thereby afford peeling separation between the uppermost sheet (12) and the sheet (14) beneath it after the uppermost sheet (12) is withdrawn from the dispenser (20; 40; 100).

2, A dispenser for sheets according to claim 1 wherein said arcuate wall portions (28) include base portions (31) adjacent said outer ends (26) and flexible cantilever portions (33) extending toward each other from said base portions (31), and said flexible cantilever portions are adapted to deflect in response to forces applied to the stack to remove the uppermost sheet (12) from the dispenser to thereby decrease the amount of force required to remove the uppermost sheet from the dispenser.

3. A dispenser far sheets according to claim 1 wherein said arcuate wall portions (28) and said bottom abutment wall (24) are shaped to arc the stack (10).

4. A dispenser for sheets according to claim 1 wherein said opposed outlet surfaces (32) are spaced proximate one another to provide peeling separation between the uppermost sheet (12) and the sheet (14) beneath the uppermost sheet and to prevent the uppermost sheet (12) and the sheet (14) beneath the uppermost sheet from being concurrently dispensed without separating.

5. A dispenser for sheets according to claim 1 wherein said opposed outlet surfaces (32) include means for preventing the adhesive of said sheets from wetting the opposed outlet surfaces.

6. A dispenser for sheets according to claim wherein said means for preventing the adhesive of said sheets from wetting the opposed outlet surfaces (32) comprises a plurality of ribs (37) extending generally towards each other from said opposed outlet surfaces (32).

7. A dispenser for sheets according to claim 6 wherein the distal ends of said ribs (37) are spaced from each other at least 0.15 centimeters~
but not more than 0.64 centimeters~.

8. A dispenser for sheets according, to claim 1 wherein said walls (22) of said dispenser are included in a unitary structure.

9. A dispenser for sheets according to claim 1 wherein said arcuate wall portions (28) are generally cylindrically concave about spaced axes (A1, A2) parallel to said outer ends (26) which define radii (R1, R2) for each arcuate wall portion, and said arcuate wall portions (28) extend toward each other along a path from said outer ends (26) of said end walls.

10. A dispenser for sheets according to claim 9 wherein said bottom abutment wall (24) is generally arcuate and cylindrically concave about an axis (A3) spaced from said axes (A1 and A2) for said arcuate wall portions such that said width to of said cavity (23) increases from the opening (34) toward the end walls (25), said bottom abutment wall axis (A3) defining a radius (R3) for said bottom abutment wall (24), and said bottom abutment wall (24) extends between inner ends of said end walls (25) which are located opposite and spaced from said outer ends (26) of said end walls.

11. A dispenser for sheets according to claim wherein said radii of said arcuate wall portions (28) are approximately equal and are approximately inches 6.54 centimeters with an arc length of approximately 4.45 centimeters, and said radius of said bottom abutment wall (24) is approximately 5.59 centimeters.

12. A dispenser for sheets according to claim 1 wherein said end walls (25), said arcuate wall portions (28), said opposed outlet surfaces (32), and said bottom abutment wall (24) extend transversely entirely through said dispenser so that said cavity has an end opening (27), the stack (10) being insertable into said cavity through said end opening (27).

13. A dispenser for sheets according to claim 12 wherein said dispenser further includes means for assisting in the loading of a replacement stack of sheets in the cavity (23A) when the existing supply of sheets is depleted.

14. A dispenser for sheets according to claim 13 wherein said means for assisting in the loading of a replacement stack of sheets in the cavity when the existing supply of sheets is depleted comprises lead-in guides (42).

15. A dispenser (10: 40: 100) for sheets according to claim 1 further including means for anchoring said dispenser to a substrate.

16. A dispenser for sheets according to claim 15 wherein said means for anchoring said dispenser to a substrate comprises a magnet with first and second surfaces with the first surface adhesively attached to the bottom wall (41) of the dispenser and the second surface of the magnet in contact with a metallic substrate.

17. A dispenser for sheets according to claim 15 wherein said substrate comprises a weighted base portion (50).

18. A dispenser for sheets according to claim 17 wherein said weighted base portion (50) includes surfaces defining a replacement stack supply chamber (52).

19. A dispenser for streets according to claim 17 wherein said weighted base portion (50) comprises a base portion (53) and an upper portion (54) having walls defining a hollow (55), said base portion (53) being adapted to be detached from the upper portion (54) to provide means for filling the hollow with ballast.

20. A dispenser for sheets according to claim 1 wherein said cavity (23) has an overall surface length which is greater than the length (L) of said stack to prevent buckling of said stack (10) as the uppermost sheet (12) is being dispensed.

22. A dispenser for sheets according to claim 1 wherein said arcuate wall portions (128) and said bottom abutment wall (124) are generally cylindrically concave about the same axis (A10) which is parallel to said outer ends (126) and which defines radii (R10 and R20) for said arcuate wall portions and said bottom abutment wall, said outer ends (126) of said end walls (125) are spaced above said bottom abutment wall (124) and said arcuate wall portions (128) expend toward each other along an aligned path from said outer ends (126).

22. A dispenser for sheets according to claim 21 wherein said radius (R20) of said friction surface portions is approximately 6.54 centimeters and said radius (R10) for said bottom abutment wall (124) is approximately 5.59 centimeters.

23. A dispenser for sheets according to claim 21 further including means for anchoring said dispenser to a substrate.

24. A dispenser for sheets according to claim 23 wherein said substrate comprises the wrist of a user and said means for anchoring said dispenser comprises an adjustable wristband (131).

25. A dispenser for sheets according to claim 21 wherein said cavity (123) has an overall surface length which is greater than the length of said stack (10) to prevent buckling of said stack as the uppermost sheet is being dispensed.

26. A stack (10; 10A: 10B) of pre-cut sheets (11: 12, 14, 16) disposed one on top of another, each sheet (11) comprising a backing (B) having first (3) and second (5) opposite major side surfaces and first (4) and second (6) opposite ends with the first end of each sheet being in alignment with the second end of an adjacent sheet in said stack (10), and a layer of adhesive (2) permanently adhered to the first side surface (3) of said sheet backing (B) with at least some adhesive generally adjacent the first and second ends or each of said sheets, the layer of adhesive (2) of each sheet (11; 12, 14, 16) being releasably adhered along the second side surface (5) of the adjacent sheet in said stack (10), said sheets (11; 12, 14, 16) comprising:
release means (8: 8A, 8B) for providing at first adhesion level along a first end portion (15) of each of said sheets (11; 12, 14, 16) adjacent said first end (4) of said backing (B) between said layer of adhesive (2) and the second side surface of the adjacent sheet in the stack to which said layer of adhesive (2) is releasably adhered, which first adhesion level provides a sufficiently low release force between said adhesive layer (2) and the adjacent sheet to which the adhesive is releasable adhered to afford sliding movement between the side surfaces (3 and 5) of the adjacent sheets (14 and 16) along said first end portion (15), and attachment means (9; 9A: 9B) for providing a second adhesion level along a second end portion (17) of each of said sheets (11; 12, 14, 16) adjacent said second end (6) of said backing (B) between said layer of adhesive (2) and the second side surface (5) of the adjacent sheet in the stack (10) to which said layer of adhesive is releasably adhered, which second adhesion level provides a release force that is higher than said sufficiently low release force along said first end portion (15) and firmly adheres the sheet (12) to the adjacent sheet (14) in the stack during sliding movement of the sheet (14) relative to the adjacent sheet (16) along said first end portion (15) while affording peeling away of the sheet (12) from the stack (10) along said second end portion (17).

27. A stack (10) of sheets according to claim 26 wherein said release means (8: 8A: 8B) provides a first adhesion level of less than about ~1.97 grams/mm~, and said attachment means (9; 9A:
provides a second adhesion level of greater than about grams/mm~- and less than about grams/mm~.

28. A stack of sheets according to claim 27 wherein said release means (8; 8A, 8B) includes a coating of silicone premium release low adhesion backsize (LAB) (1') along said second side surface (5) of said backing (B), said layer of pressure sensitive adhesive (2) comprises a uniform, pressure sensitive adhesive of the same adhesive composition, and has an adhesion to glass of less than grams/millimeter~.

29. A stack (10) of sheets according to claim 26 wherein said layer of adhesive (2B) comprises a pressure sensitive adhesive which has a different composition along said first (15B) and second (17B) end portions to provide at least portions of said release (8B) and attachment (9B) means.

30. A stack (10) of sheets according to claim 26, wherein said release means (8: 8A; 8B) includes a discontinuous coating of pressure sensitive adhesive (18) on each of the sheets (11; 12, 14, 16) along the first end portion (15) and a continuous coating of pressure sensitive adhesive (18') along the second end portion (17).

31. A stack (10) of sheets according to claim 26, wherein said first end portion (15) is continuous, extends from said first end (4) along the length of said backing (B) and comprises between ten (10) and eighty (80) percent of the area of a side of said backing (B) of each of the sheets (11: 12, 14, 16) in said stack.

32. A stack (10) of sheets according to claim 31, wherein said first end portion (15) comprises generally about thirty-seven and one-half percent of the area of a side of said backing (B) of each of the sheets (11; 12, 14, 16) in said stack (10).

33. A stack (10) of sheets according to claim 26, wherein said release means (8) includes a discontinuous coating of pressure sensitive adhesive along each of the sheet backings in the first and second end portions with the coating of pressure sensitive adhesive in the first end portion (15) more discontinuous than the coating of pressure sensitive adhesive in the second end portion (17).

34. A stack of sheets according to claim 26 wherein: said attachment means (9: 9A; 9B) comprises a layer of medium release low adhesion backsize (LAB) (1) coated over at least a portion of said second major side surface (5) adjacent said second end (6) of each of said sheets, and said release means (8; 8A; 8B) comprises a layer of premium release low adhesion backsize (LAB) (1') coated over a portion of said second major side surface (5) adjacent said first end (4) of each of said sheets.

35. A stack of sheet, according to claim 34 wherein said sheets (11: 12, 14, 16) in said stack haves a length along a longitudinal axis (A) and a width along a direction perpendicular to the longitudinal axis of the stack (10), and said layer of premium release low adhesion backsize (LAB) (1') is continuous, extends from said first end of said backing (B) along the length of each of said sheets (11: 12, 14, 16) and comprises between ten (10) and eighty (80) percent of the area of a side of the backing (B) of each sheet in said stack.

36. A stack of sheets according to claim 34, wherein said premium release low adhesion backsize (LAB) layer (1') comprises generally about thirty-seven and one-half percent of the area of a side of the backing (B) of each sheet in said stack.

37. In combination, a stack (10; 10A: 10B) of pre-cut sheets (11: 12, 14, 16) and a dispenser (20; 40;
100) for flexible sheets from said stack of pre-cut sheets disposed one on top of another, each sheet (11;
12. 14, 16) comprising a backing (B) having first (3) and second (5) apposite major side surfaces and first (4) and second (6) opposite ends with the first end (4) of each sheet being in alignment with the second end (6) of an adjacent sheet in said stack (10), and a layer of adhesive (2) permanently adhered to the first side surface (3) of said sheet backing (B), the layer of adhesive (2) of each sheet (11; 12. 14, 16) being releasably adhered along the second side surface (5) of the adjacent sheet in said stack (10), said sheets comprising release means (8: 8A: 8B) for providing a first adhesion level along a first end portion (15) of each of said sheets (11; 12, 14, 16) adjacent said first end (4) of said backing (B) between said layer of adhesive (2) and the second side surface of the adjacent sheet in the stack to which said layer of adhesive (2) is releasably adhered, which first adhesion level provides a sufficiently low release force between said adhesive coating layer (2) and the adjacent sheet to which the adhesive is releasable adhered to afford sliding movement between the side surfaces (3 and 5) of the adjacent sheets (14 and 16) along said first end portion (15), and attachment means (9; 9A; 9B) for providing a second adhesion level along a second end portion (17), of each of said sheets (11; 12, 14, 16) adjacent said second end (6) of said backing (B) between said layer of adhesive (2), and the second side surface (5) of the adjacent sheet in the stack (10) to which said layer of adhesive is releasably adhered, which second adhesion level provides a release force that is higher than said sufficiently low release force along said first end portion (15) and firmly adheres the sheet to the adjacent sheet (14) in the stack during sliding movement of the sheet (14) relative to the adjacent sheet (16) along said first end portion while affording peeling away of the sheet (12) from the stack (10) along said second end portion (17), the dispenser (20; 40; 100) comprising:
walls (22) having surfaces defining a cavity (23) adapted to receive the stack (10), said walls (22) including:
a bottom abutment wall (24) defining a bottom surface (24'), end walls (25) defining end surfaces (25') at opposite ends of said bottom surface (24') and having generally parallel outer ends (26), arcuate wall portions (28) generally opposite said bottom abutment wall (24) extending generally toward each other from said outer ends (26) and having spaced distal ends (29), said arcuate wall portions (28) defining arcuate friction surface portions (28'), opposed outlet surfaces (32) at said distal ends (29) defining an opening (34) through said walls (22), said arcuate friction surface portions (28') and said bottom surface (24') being shaped to afford reciprocating movement of the stack (10) of sheets within the cavity (23) in response to forces applied to the stack (10) to sequentially remove sheets (12, 14, 16) from the stack through said opening (34), and to position the uppermost sheets of the stack adjacent the arcuate friction surface portions (28') with the second end portion (17) of the uppermost sheet (12), in the stack projecting through the opening (04) so that by grasping that second end portion (17), the uppermost sheet (12) in the stack can be manually pulled through the opening (34) and will carry with it the second end portion (17) of the sheet (14) beneath it in the stack to which the uppermost sheet is adhered by the adhesive coating layer (2), placing that second end portion (17) in a position where it also may be grasped and pulled to withdraw that sheet (14) from the stack, said arcuate friction surface portions (28') being shaped to provide means for affording sliding movement of the adhesively joined first end portion (15) of the uppermost sheet (12) and the second end portion (17) of the sheet beneath the uppermost sheet between the second side surface (5) of a subsequent sheet (16) in the stack and the adjacent arcuate friction surface portion (28'), and for making sufficient frictional engagement with the second side surface (5) of the sheet (14) beneath the uppermost sheet to restrict the movement of the sheet (14) beneath the uppermost sheet between the rest of the stack (10) and the adjacent arcuate friction surface portion (28') to thereby afford peeling separation between the uppermost sheet (12) and the sheet (14) beneath it after the uppermost sheet (12) is withdrawn from the dispenser (20; 40; 100).

38. A stack of sheets according to claim 26 wherein said release means (8) provides a first adhesion level of greater than 2 grams per inch and less than about 1.97 grams/mm.

39. A stack (10; 10A; 10B) of successive sheets (12, 14, 16) disposed one on tip of another, including at least a first, uppermost sheet (12), a second sheet (14) beneath and adjacent the uppermost sheet and a third sheet (16) beneath and adjacent the second sheet, each of said sheets comprising:
a backing (B) having first (3) and second (5) opposite side surfaces and first (4) and second (6) opposite ends with the first end (4) of each sheet in alignment with the second end (6) of an adjacent sheet in said stack (10), and an adhesive (2; 2A; 2B) generally permanently adhered to the first side surface (3) of said sheet backing (B) with at least some adhesive generally adjacent the first and second ends of each of said sheets, the adhesive (2; 2A; 2B) of each sheet adapted to releasably adhere said sheet along the second side surface (5) of the adjacent sheet in said stack;
at least two of said sheets comprising:
release means (8) generally adjacent said first end (4) of a sheet for providing a first adhesion level between the adhesive (2) of the sheet and the second side surface (5) of the adjacent sheet in the stack, attachment means (9) generally adjacent said second end of the sheet for providing a second adhesion level between the adhesive (2) of said sheet and the second side surface (5) of the adjacent sheet in the stack;
wherein said first adhesion level provides a sufficiently low release forces between the adhesive (2) of the sheet and the second side surface of the adjacent sheet such that when the sheet comprises said second sheet (14), the first adhesion level affords sliding movement between a first portion (15) of the side surface of the second sheet (14) and the third sheet (16), wherein said second adhesion level provides a release force that is higher than said sufficiently low release force, such that when the sheet comprises said second sheet (14), the second adhesion level firmly adheres a second portion (17) of the second sheet (14) to the third sheet (16) in the stack during the sliding movement of the first portion (15) of the second sheet (14) relative to the third sheet (16), and when the sheet comprises said first sheet (12), said second adhesion level affords peeling away of said first sheet (12) from said second sheet (14).

40. A stack of sheets according to claim 39 wherein said release means provides a first adhesion level of greater than 2 grams per inch and less thin about 1.97 grams/mm.

41. A stack of sheets according to claim 39 wherein said release means includes a premium release.
low adhesion backsize (LAB).

42. A stack of sheets according to claim 39 wherein said release means provides a first adhesion level of less than about 1.97 grams/mm, and said attachment means provides a second adhesion level of greater than about 3 grams/mm and less than about 17 grams/mm.

43. A stack or sheets according to claim 39 wherein said first and second adhesion levels are greater than zero, and sand first adhesion level is different than said second adhesion level.