CA1148701A - Elastic leg disposable diaper and process for manufacturing same - Google Patents
Elastic leg disposable diaper and process for manufacturing sameInfo
- Publication number
- CA1148701A CA1148701A CA000348631A CA348631A CA1148701A CA 1148701 A CA1148701 A CA 1148701A CA 000348631 A CA000348631 A CA 000348631A CA 348631 A CA348631 A CA 348631A CA 1148701 A CA1148701 A CA 1148701A
- Authority
- CA
- Canada
- Prior art keywords
- elastic strips
- diaper
- elastic
- diapers
- cover sheet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/15577—Apparatus or processes for manufacturing
- A61F13/15585—Apparatus or processes for manufacturing of babies' napkins, e.g. diapers
- A61F13/15593—Apparatus or processes for manufacturing of babies' napkins, e.g. diapers having elastic ribbons fixed thereto; Devices for applying the ribbons
Abstract
Abstract of the Disclosure An improved elastic leg dispos-able diaper and process for manufacturing same; wherein the diaper includes elastic strips extending and being secured to the diaper continuously along the full length of the outside longitudinal edges of the diaper and wherein the elastic strips are secured in the crotch area in stretched elastically-contractible condition forming gathered and extendible side portions in the crotch area for elastic compliance of such side portions to the legs of the wearer.
Description
1~870~
IMPROVED ELASTIC LEG DISPOSABLE DIAPER
AND PROCESS FOR MANUFACTURING SAME
Field of the Invention .
This invention relates to an improved elastic leg disposable diaper and process for manufactur-ing same; wherein, the diaper includes elastic strips extending and being secured to the diaper continuously along the full length of the outside longitudinal edges of the diaper in a new and improved manner and wherein the elastic strips are secured in the crotch area in stretched elastically--contractible - condition forming gathered and elastically-extendible side portions in the crotch area for elastic conformance of such side portions with the legs of the wearer.
Background of the Tnvention , .
Over the past decade, disposable diapers, which include fluid-absorbent interior pads positioned between fluid-permeable top cover sheets and fluid-impermeable bottom cover sheets, have become increasingly popular. These disposable diapers are fabricated and sold in various shapes, sizes and constructions.
More recently, disposable diapers known in the trade as "elastic leg" disposable diapers have been introduced and are gaining popularity.
These disposable diapers are preferably of generally hour-glass configuration including a central crotch-fitting area and outer waist-fitting areas and have elastic strips secured along the outside longitudinal edges of the crotch area of the disposable diapers ii ,q~
.
1~4l~701
IMPROVED ELASTIC LEG DISPOSABLE DIAPER
AND PROCESS FOR MANUFACTURING SAME
Field of the Invention .
This invention relates to an improved elastic leg disposable diaper and process for manufactur-ing same; wherein, the diaper includes elastic strips extending and being secured to the diaper continuously along the full length of the outside longitudinal edges of the diaper in a new and improved manner and wherein the elastic strips are secured in the crotch area in stretched elastically--contractible - condition forming gathered and elastically-extendible side portions in the crotch area for elastic conformance of such side portions with the legs of the wearer.
Background of the Tnvention , .
Over the past decade, disposable diapers, which include fluid-absorbent interior pads positioned between fluid-permeable top cover sheets and fluid-impermeable bottom cover sheets, have become increasingly popular. These disposable diapers are fabricated and sold in various shapes, sizes and constructions.
More recently, disposable diapers known in the trade as "elastic leg" disposable diapers have been introduced and are gaining popularity.
These disposable diapers are preferably of generally hour-glass configuration including a central crotch-fitting area and outer waist-fitting areas and have elastic strips secured along the outside longitudinal edges of the crotch area of the disposable diapers ii ,q~
.
1~4l~701
-2-for ~orming extendible side portions along the crotch area of the diaper ~or elastic compliance to the legs of the wearer, such as has heretofore been available with waterproof panties utilized in diapering infants. Examples of commercial forms of such elastic leg diapers may be seen in The Procter & Gamble Company's U.S. Patent 3,860,003 and Kimberly-Clark Corporation's U.S. Patent 4,050,462.
Although the elastic leg disposable diapers commercialized under each of these two prior art patents are apparently successful in the marketplace, the diapers of these two prior art patents suffer from certain disadvantages relating to the manner in which the elastic strips are secured within the longitudinal edges of the diaper which result in structural deficiencies and an expensive and complicated procedure of inserting such elastic strips.
Although the Procter & Gamble U.S. Patent
Although the elastic leg disposable diapers commercialized under each of these two prior art patents are apparently successful in the marketplace, the diapers of these two prior art patents suffer from certain disadvantages relating to the manner in which the elastic strips are secured within the longitudinal edges of the diaper which result in structural deficiencies and an expensive and complicated procedure of inserting such elastic strips.
Although the Procter & Gamble U.S. Patent
3,860,003 does not fully and clearly disclose the process utilized in inserting the elastic strips - within the longitudinal edges of the disposable diaper, its subsequent U.S. Patent 4,081,301 clearly discloses such process. As may be seen in this Procter & Gamble U.S. Patent 4,081,301 and in the Kimberly-Clark U.S. Patent 4,050,462, both of these elastic leg disposable diaper products involve the insertion of the elastic strips within the longitudinal edges of the disposable diaper being manufactured in serially-interconnected form by a process in which adhesive is intermittently applied to spaced-apart portions or lengths of continuous strips of elastic and the elastic strips are continuously stretched and secured within the longitudinal edges of the disposable diapers so that the portions of the elastic strips having adhesive thereon are secured within the crotch area of the diaper and the lengths ^ .
~8701 of the elastic strips without adhesive thereon are positioned within the longitudinal edges of the outer waist areas of the diaper. With this construc-tionJ when the disposable diapers are cut apart into individual diapers and the elastic strips are cut, the portions of the elastic strips which are un-secured within the waist-fitting portions of the diaper will snap within the diaper leaving loose ends therein and the portion or lengths of the elastic strips secured within the crotch area of the diaper will gather such area forming extendible side portions.
As a result of the above manufacturing process, the snapping in of the loose or unsecured ends of the elastic strips at the outer waist-fitting areas of the diaper sometimes results in damage to the diaper and leaves open passages through the transverse edges of the diaper which may be susceptible to moisture leaks, etc. Also, this prior manufacturing process requires compli-cated and expensive equipment, such as that disclosed in the above-identified Procter ~ Gamble U.S. Patent 4,081,301.
Summary of the Invention Accordingly, it is the object of this invention to provide an improved, elastic leg, disposable diaper and process ~or manufacturing same which over-comes the problems discussed above with prior elastic leg diaper products and their process for manufacture and provides an improved and simplified product and process.
According to this invention there ls prov~ided an improved elastic leg disposable diaper having a central crotch-fitting area and outer waist-fitting areas comprising:
a fluid-permeable top cover sheet;
a fluid-impermeable bottom cover sheet;
a fluid-absorbent interior pad positioned between said top and bottom cover sheets in superimposed position; and ,~ -3-..
- , ' .
1~48701 elastic strips extending and being secured to said diaper along the full length of the outside longitudinal edges of said diaper, and wherein said elastic strips are secured in said crotch area in stretched elastically-contract-ible condition forming gathered and extendible side portions in said crotch area for elastic conformance with the legs of the wearer, said elastic strips being secured to said diaper in said waist areas in less elastically contractible or relaxed condition so as to provide less or no gathering of the side portions in said waist areas.
The present invention also provides a process of securing elastic strips within longitudinal edges of elastic leg disposable diapers having central crotch-fitting areas and outer waist-fitting areas to form gathered and extendible side portions in the crotch area of the diapers during manufacture of such diapers; said process comprising the steps of:
feeding continuous elastic strips from a supply into desired position in contact within the longitudinal edges of the diapers, while effecting adhesive securement therebetween along the entire length of the edges; and alternately stretching and relaxing predetermined lengtks of the continuous elastic strips during said feeding step for adhering the stretched lengths of the continuous elastic strips to the crotch areas and the relaxed lengths of the continuous elastic strips to the waist areas continuously aiong t4e longitudinal edges of the serially-interconnected diapers;
so that, the stretched lengths of the elastic strips will contract and form gathered and extendible side portions in the crotch are~ of the diaper.
The product and process of this invent~on eliminate the problems and disadvantages discussed above and provide a simplified product and process, as will be discussed in more detail in tke detailed~ description of this invention to foilow.
.~ -4-~ ':
114870~
Brief Description of the Drawings Some of the objects and advantages of this invention having been set forth, other objects and advantages will appear when taken in conjunction with the accompanying drawings in which:
Figure 1 is a perspective view of the improved elastic leg disposable diaper of this invention in flat condition with the side portions of the crotch area in an extended position;
Figure 2 is a cross sectional view taken through the crotch area of the diaper and generally along the line 2-2 of Figure l;
~D
3L~ -4a-, -Figure 3 is a cross sectional view taken through one of the outer waist areas of the diaper and generally along the line 3-3 of Figure l;
Figure 4 is a top perspective view of the diaper of Figure l with the side portions of the crotch area in relaxed, gathered and extendible position;
Figure 5 is a cross sectional view taken through one of the longitudinal edges of the relaxed diaper of Figure 4 and generally along the line 5-5 of Figure 4;
Figure 6 is a schematic view illustrating apparatus which is capable of practicing the improved process of this invention;
Figure 7 is a schematic side elevational view of a portion of the apparatus of Figure 6; and Figure 8 is an exploded view of the components of the elastic leg disposable diaper produced by the process of this invention in serially-interconnected form prior to being cut apart in individual diapers and showing the lengths of the elastic strips in stretched and relaxed conditions, respectively, as the strips are inserted into the serially-interconnect-ed diapers during manufacture.
Detailed Oe~cri~ti~ of the Invention In the drawings, Figures 1-5 illustrate the improved elastic leg disposable diaper and Figures 6-8 illustrate the improved process of this invention.
Referring firstly to Figures 1-5, the improved elastic leg disposable diaper, generally indicated at lO, is preferably of generally hour-glass configuration and has a central crotch-fitting area C and outer waist-fitting areas W designed to be placed around the crotch and waist of the wearer when the diaper lO is placed on the wearer in convention-al manner.
, ' ' , . ~ ,.
;
., .
70~
The diaper 10 further includes a fluid-permeable top cover sheet 11, which may be of any suitable construction conventionally utilized in disposable diaper and other absorbent article constructions 5 for being positioned in contact with the wearer of the disposable diaper 10 for receiving and passing therethrough body fluids of the wearer. The diaper lO further includes a fluid-impermeable bottom cover sheet 12, which may be constructed of plastic or other suitable material conventionally utilized in such disposable diaper and other disposable absorbent article constructions for being positioned away from the wearer for preventing the body fluids of the wearer from passing out of the disposable diaper 10. Positioned between the top cover sheet 11 and the bottorn cover sheet 12 is a fluid-absorbent interior pad 13 for absorbing body fluids of the wearer.
As illustrated in Figure 2, this interior absorbent pad 13 may include two layers or may be a single layer or any other suitable construction conventionally utilized in such disposable diaper constructions.
The disposable diaper 10 is secured along its longitudinal and transverse edges by suitable adhesive or other attachment means 14 which secures the top sheet 11 to the bottom sheet 12 and generally provides an envelope around the interior pad which is unsecured at its longitudinal edges and in the central crotch area C to either the top cover sheet or bottom cover sheet to allow the pad to conform to the shape of the diaper when placed in position on the wearer.
The diaper 10 further includes elastic strips 16 extending and being secured by adhesive or other suitable means 17, see Figure 5, to the diaper 10 continuously along the full length of the outside longitudinal edges of the diaper, as ,, l ~L~4S701 indicated in Figures 1, 4 and 5. These elastic strips, as will be explained in detail below, are secured in the crotch area C in stretched elastically-contract-ible condition forming gathered and extendible side portions P in the crotch area C, as shown in Figures 4 and 5, for elastic compliance to the legs of the wearer. Preferably, the elastic strips 16 are secured in the waist areas W in less elastically-contractible or relaxed condition so as to provide less or no gathering of the side portions of the waist areas W, as indicated in Figures 4 and 5.
As may be clearly seen in Figures 1 and 2, the interior absorbent pad 13 extends to close proximity with and within approximately 3/4 of an inch of the elastic strips 16 on both of the longitudinal sides of the diaper lO to provide fluid absorbency in the elastically-contractible side portions P of the diaper 10 .
Considering now the improved process of this invention, reerence may be had to Figures 6 and 7 which show schematically portions of an apparatus suitable for use in the process of producing the improved elastic leg diapers 10 of the present invention. Full details of mechanical connections, drives, etc.
are not illustrated and will not be described herein for purposes of ciarity.
However, details of the constructions and operation of apparatus for assembling such diapers may be seen in prior U.S. Patents Re.28, 139 and 3,984,272, which are assigned to the assignee o the present invention.
Referring now to the apparatus illustrated in Figures 6 and 7, interconnected multi-layer absorbent pads 13, constructed in accordance with disclosure of applicant's co-pending U.S. patent application 046,114 or otherwise, are fed through pairs of driven feed rolls 65, 66 between whick is prov~ided a pad severing means in the form of a rotating cutting roll 67 having a knife blade 68 thereon and an anvil roll 69 which operate to intermittently cut the interconnected multi-layer pads 13 transversely or separation of the inter-. ,,.~, ,, , .: "~
- : :
~1~8701 connected pads 13. The driven feed rolls 66 are driven somewhat faster than the driven feed rolls 65 to effect an overfeeding of the severed multi-layer ab~orbent pads 13 for spacing the pads apart in the further fabrication of the disposable diapers.
Immediately prior to the feed rolls 66, the top cover sheet 11 is fed from a suitable source of supply to feed rolls 66 and through a glue applicator 71 which applies the glue or adhesive 14 of a suitable type in a predetermined pattern transversely across the cover sheet 11 at spaced locations and along the longitudinal edges of the top cover sheet 11 for purposes of gluing the transverse and longitudinal edges of the ultimately fabricated disposable diaper 10 together.
Glue application 71 may comprise any suitable glue applicator for the above purpose and as illustrated herein may include a glue applicator roli 72 having indentations or cups 72' therein ,~. _ ~_ ''" ~
- .
! ':
1~8701 g which collectively are o~ the predetermined configuration of theareas for receiving adhesive 14. The applicator roll 72 may pass through an adhesive supply tank 73 for containing a supply of the adhesive 14.
Simultaneousl~ with the above, the bottom cover sheet 12 i5 fed from a source of supply to feed rolls 66 and into superimposed position under the spaced-apart interior pads 13 and top cover sheet 11 so that all of these components are in superimposed position. The top cover sheet 11 and bottom cover sheet 12 are pressed into contact with each other by the feed rolls 66 and subsequent rolls and are adhesively secured together along longitudinal edges and transverse].y between the separated and spaced-apart absorbent pads 13 to form seriall.y-interconnected disposable diapers 10.
These serially-interconnected diapers are fed through a series of mechanisms, not shown, and are ultimately fed between cutter roll 75 and anvil roll 76 which cut the serially-interconnected diapers 10 transversely between interior pads to form individual diapers 10.
For cooperating with the above-described apparatus and process for manufacturing disposable diapers 10, the present invention has provided an improved process utilizing apparatus, generally indicated at 20, for inserting the elastic strips 16 into the longitudinal edges of the disposable diapers 10 during the above-descrîbeA manufacture and assembly of the diaper 10.
This means 20 for inserting the elastic strips 16 comprises means for feeding continuous elastic strips 16 from a supply 21 into desired position between feed rolls 66 in contact with the longitudinal edges of the serially-interconnected , .
: .
--1,0-- , diapers for adhesive securement therebetween. This feeding means may include driven feed rolls 23 and feed rolls 6~ between which the elastic strips are fed. As may be seen in Figures 6 and 7, the elastic strips are thus inserted along the longitudinal edges of the serially-interconnected diapers 10 at the point in which the top cover sheet 11, bottom cover sheet 12 and spaced-apart interior pads 13 are brought into superimposed position with each other or at the feed rolls 66.
The elastic strips 16 may include a fast acting contact adhesive coating or other type of adhesive already on the strips 16 or such adhesive may be applied by an applicator device 25 which includes an adhesive applicator roll 26 passing through a trough 27 of fast acting adhesive and having indentations or cups 26' therein for picking up and applying adhesive continuously along the elastic strips 16. Regardless of how the adhesive is applied, it is important that the adhesive be fast acting since the elastic strips are being secured in both stretched and relaxed conditions as will be discussed below.
The elastic strip inserting means 20 further includes means for alternately stretching and relaxing predetermined lengths of the continuous elastic strips in timed relationship to the feeding thereof by the feeding means so that the stretched lengths of elastic strips will be adhered to the crotch area C and the substantially relaxed lengths of elastic StLips 16 will be adhered to the waist areas W continuously along the longitudinal edges of the serially-interconnected diapers 10. This is clearly indicated in Figure 8 wherein the portions or lengths of the elastic strips 16 indicated by , .
.
, ' .:
370~
-1,1- , the brackets R are relaxed portions and are secured to the longitudinal edges of the waist areas W of the serially-interconnected diapers 10 and the portions or lengths of the elastic strips indicated by the brackets S are stretched portions and are secured to the longitudinal edges of the cr~tch areas C
of the serially-interconnected diapers 10.
~ he means for alternately stretching and relaxing the predetermined lengths of the elastic strips is shown schematically herein as including the roll 30 connected to the end of a piston and cylinder device 31, 32 which, in turn, is suitably operated and controlled by a device (not shown) which will alternately move the roll 30 into and out of engagement with the elastic strips 16 for intermittently stretching and relaxing the elastic strips 16 so that intermittent stretched and relaxed portions or lengths S and R of the elastic strips 16 will be presentea to the above-described diaper assembly machine in position within the longitudinal edges of the diaper as it is being assembled. The specific design and operation of the mechanism for alternately stretching and relaxing the elastic strips 16 does not form a part of the present invention.
Thus, this invention has provided an improved elastic leg disposable diaper and process for manufacturing same which overcomes problems presented with prior art forms of such diaper and the process and apparatus involved particularly with the insertion of the elastic strips therein.
In the drawings and specification, there have been set forth preferred embodiments of the invention and although specific terms are employed, they are used in a generic and descriptive sense only and not for purposes of limitation.
. :-~', ' ' ~'-.. ~
~8701 of the elastic strips without adhesive thereon are positioned within the longitudinal edges of the outer waist areas of the diaper. With this construc-tionJ when the disposable diapers are cut apart into individual diapers and the elastic strips are cut, the portions of the elastic strips which are un-secured within the waist-fitting portions of the diaper will snap within the diaper leaving loose ends therein and the portion or lengths of the elastic strips secured within the crotch area of the diaper will gather such area forming extendible side portions.
As a result of the above manufacturing process, the snapping in of the loose or unsecured ends of the elastic strips at the outer waist-fitting areas of the diaper sometimes results in damage to the diaper and leaves open passages through the transverse edges of the diaper which may be susceptible to moisture leaks, etc. Also, this prior manufacturing process requires compli-cated and expensive equipment, such as that disclosed in the above-identified Procter ~ Gamble U.S. Patent 4,081,301.
Summary of the Invention Accordingly, it is the object of this invention to provide an improved, elastic leg, disposable diaper and process ~or manufacturing same which over-comes the problems discussed above with prior elastic leg diaper products and their process for manufacture and provides an improved and simplified product and process.
According to this invention there ls prov~ided an improved elastic leg disposable diaper having a central crotch-fitting area and outer waist-fitting areas comprising:
a fluid-permeable top cover sheet;
a fluid-impermeable bottom cover sheet;
a fluid-absorbent interior pad positioned between said top and bottom cover sheets in superimposed position; and ,~ -3-..
- , ' .
1~48701 elastic strips extending and being secured to said diaper along the full length of the outside longitudinal edges of said diaper, and wherein said elastic strips are secured in said crotch area in stretched elastically-contract-ible condition forming gathered and extendible side portions in said crotch area for elastic conformance with the legs of the wearer, said elastic strips being secured to said diaper in said waist areas in less elastically contractible or relaxed condition so as to provide less or no gathering of the side portions in said waist areas.
The present invention also provides a process of securing elastic strips within longitudinal edges of elastic leg disposable diapers having central crotch-fitting areas and outer waist-fitting areas to form gathered and extendible side portions in the crotch area of the diapers during manufacture of such diapers; said process comprising the steps of:
feeding continuous elastic strips from a supply into desired position in contact within the longitudinal edges of the diapers, while effecting adhesive securement therebetween along the entire length of the edges; and alternately stretching and relaxing predetermined lengtks of the continuous elastic strips during said feeding step for adhering the stretched lengths of the continuous elastic strips to the crotch areas and the relaxed lengths of the continuous elastic strips to the waist areas continuously aiong t4e longitudinal edges of the serially-interconnected diapers;
so that, the stretched lengths of the elastic strips will contract and form gathered and extendible side portions in the crotch are~ of the diaper.
The product and process of this invent~on eliminate the problems and disadvantages discussed above and provide a simplified product and process, as will be discussed in more detail in tke detailed~ description of this invention to foilow.
.~ -4-~ ':
114870~
Brief Description of the Drawings Some of the objects and advantages of this invention having been set forth, other objects and advantages will appear when taken in conjunction with the accompanying drawings in which:
Figure 1 is a perspective view of the improved elastic leg disposable diaper of this invention in flat condition with the side portions of the crotch area in an extended position;
Figure 2 is a cross sectional view taken through the crotch area of the diaper and generally along the line 2-2 of Figure l;
~D
3L~ -4a-, -Figure 3 is a cross sectional view taken through one of the outer waist areas of the diaper and generally along the line 3-3 of Figure l;
Figure 4 is a top perspective view of the diaper of Figure l with the side portions of the crotch area in relaxed, gathered and extendible position;
Figure 5 is a cross sectional view taken through one of the longitudinal edges of the relaxed diaper of Figure 4 and generally along the line 5-5 of Figure 4;
Figure 6 is a schematic view illustrating apparatus which is capable of practicing the improved process of this invention;
Figure 7 is a schematic side elevational view of a portion of the apparatus of Figure 6; and Figure 8 is an exploded view of the components of the elastic leg disposable diaper produced by the process of this invention in serially-interconnected form prior to being cut apart in individual diapers and showing the lengths of the elastic strips in stretched and relaxed conditions, respectively, as the strips are inserted into the serially-interconnect-ed diapers during manufacture.
Detailed Oe~cri~ti~ of the Invention In the drawings, Figures 1-5 illustrate the improved elastic leg disposable diaper and Figures 6-8 illustrate the improved process of this invention.
Referring firstly to Figures 1-5, the improved elastic leg disposable diaper, generally indicated at lO, is preferably of generally hour-glass configuration and has a central crotch-fitting area C and outer waist-fitting areas W designed to be placed around the crotch and waist of the wearer when the diaper lO is placed on the wearer in convention-al manner.
, ' ' , . ~ ,.
;
., .
70~
The diaper 10 further includes a fluid-permeable top cover sheet 11, which may be of any suitable construction conventionally utilized in disposable diaper and other absorbent article constructions 5 for being positioned in contact with the wearer of the disposable diaper 10 for receiving and passing therethrough body fluids of the wearer. The diaper lO further includes a fluid-impermeable bottom cover sheet 12, which may be constructed of plastic or other suitable material conventionally utilized in such disposable diaper and other disposable absorbent article constructions for being positioned away from the wearer for preventing the body fluids of the wearer from passing out of the disposable diaper 10. Positioned between the top cover sheet 11 and the bottorn cover sheet 12 is a fluid-absorbent interior pad 13 for absorbing body fluids of the wearer.
As illustrated in Figure 2, this interior absorbent pad 13 may include two layers or may be a single layer or any other suitable construction conventionally utilized in such disposable diaper constructions.
The disposable diaper 10 is secured along its longitudinal and transverse edges by suitable adhesive or other attachment means 14 which secures the top sheet 11 to the bottom sheet 12 and generally provides an envelope around the interior pad which is unsecured at its longitudinal edges and in the central crotch area C to either the top cover sheet or bottom cover sheet to allow the pad to conform to the shape of the diaper when placed in position on the wearer.
The diaper 10 further includes elastic strips 16 extending and being secured by adhesive or other suitable means 17, see Figure 5, to the diaper 10 continuously along the full length of the outside longitudinal edges of the diaper, as ,, l ~L~4S701 indicated in Figures 1, 4 and 5. These elastic strips, as will be explained in detail below, are secured in the crotch area C in stretched elastically-contract-ible condition forming gathered and extendible side portions P in the crotch area C, as shown in Figures 4 and 5, for elastic compliance to the legs of the wearer. Preferably, the elastic strips 16 are secured in the waist areas W in less elastically-contractible or relaxed condition so as to provide less or no gathering of the side portions of the waist areas W, as indicated in Figures 4 and 5.
As may be clearly seen in Figures 1 and 2, the interior absorbent pad 13 extends to close proximity with and within approximately 3/4 of an inch of the elastic strips 16 on both of the longitudinal sides of the diaper lO to provide fluid absorbency in the elastically-contractible side portions P of the diaper 10 .
Considering now the improved process of this invention, reerence may be had to Figures 6 and 7 which show schematically portions of an apparatus suitable for use in the process of producing the improved elastic leg diapers 10 of the present invention. Full details of mechanical connections, drives, etc.
are not illustrated and will not be described herein for purposes of ciarity.
However, details of the constructions and operation of apparatus for assembling such diapers may be seen in prior U.S. Patents Re.28, 139 and 3,984,272, which are assigned to the assignee o the present invention.
Referring now to the apparatus illustrated in Figures 6 and 7, interconnected multi-layer absorbent pads 13, constructed in accordance with disclosure of applicant's co-pending U.S. patent application 046,114 or otherwise, are fed through pairs of driven feed rolls 65, 66 between whick is prov~ided a pad severing means in the form of a rotating cutting roll 67 having a knife blade 68 thereon and an anvil roll 69 which operate to intermittently cut the interconnected multi-layer pads 13 transversely or separation of the inter-. ,,.~, ,, , .: "~
- : :
~1~8701 connected pads 13. The driven feed rolls 66 are driven somewhat faster than the driven feed rolls 65 to effect an overfeeding of the severed multi-layer ab~orbent pads 13 for spacing the pads apart in the further fabrication of the disposable diapers.
Immediately prior to the feed rolls 66, the top cover sheet 11 is fed from a suitable source of supply to feed rolls 66 and through a glue applicator 71 which applies the glue or adhesive 14 of a suitable type in a predetermined pattern transversely across the cover sheet 11 at spaced locations and along the longitudinal edges of the top cover sheet 11 for purposes of gluing the transverse and longitudinal edges of the ultimately fabricated disposable diaper 10 together.
Glue application 71 may comprise any suitable glue applicator for the above purpose and as illustrated herein may include a glue applicator roli 72 having indentations or cups 72' therein ,~. _ ~_ ''" ~
- .
! ':
1~8701 g which collectively are o~ the predetermined configuration of theareas for receiving adhesive 14. The applicator roll 72 may pass through an adhesive supply tank 73 for containing a supply of the adhesive 14.
Simultaneousl~ with the above, the bottom cover sheet 12 i5 fed from a source of supply to feed rolls 66 and into superimposed position under the spaced-apart interior pads 13 and top cover sheet 11 so that all of these components are in superimposed position. The top cover sheet 11 and bottom cover sheet 12 are pressed into contact with each other by the feed rolls 66 and subsequent rolls and are adhesively secured together along longitudinal edges and transverse].y between the separated and spaced-apart absorbent pads 13 to form seriall.y-interconnected disposable diapers 10.
These serially-interconnected diapers are fed through a series of mechanisms, not shown, and are ultimately fed between cutter roll 75 and anvil roll 76 which cut the serially-interconnected diapers 10 transversely between interior pads to form individual diapers 10.
For cooperating with the above-described apparatus and process for manufacturing disposable diapers 10, the present invention has provided an improved process utilizing apparatus, generally indicated at 20, for inserting the elastic strips 16 into the longitudinal edges of the disposable diapers 10 during the above-descrîbeA manufacture and assembly of the diaper 10.
This means 20 for inserting the elastic strips 16 comprises means for feeding continuous elastic strips 16 from a supply 21 into desired position between feed rolls 66 in contact with the longitudinal edges of the serially-interconnected , .
: .
--1,0-- , diapers for adhesive securement therebetween. This feeding means may include driven feed rolls 23 and feed rolls 6~ between which the elastic strips are fed. As may be seen in Figures 6 and 7, the elastic strips are thus inserted along the longitudinal edges of the serially-interconnected diapers 10 at the point in which the top cover sheet 11, bottom cover sheet 12 and spaced-apart interior pads 13 are brought into superimposed position with each other or at the feed rolls 66.
The elastic strips 16 may include a fast acting contact adhesive coating or other type of adhesive already on the strips 16 or such adhesive may be applied by an applicator device 25 which includes an adhesive applicator roll 26 passing through a trough 27 of fast acting adhesive and having indentations or cups 26' therein for picking up and applying adhesive continuously along the elastic strips 16. Regardless of how the adhesive is applied, it is important that the adhesive be fast acting since the elastic strips are being secured in both stretched and relaxed conditions as will be discussed below.
The elastic strip inserting means 20 further includes means for alternately stretching and relaxing predetermined lengths of the continuous elastic strips in timed relationship to the feeding thereof by the feeding means so that the stretched lengths of elastic strips will be adhered to the crotch area C and the substantially relaxed lengths of elastic StLips 16 will be adhered to the waist areas W continuously along the longitudinal edges of the serially-interconnected diapers 10. This is clearly indicated in Figure 8 wherein the portions or lengths of the elastic strips 16 indicated by , .
.
, ' .:
370~
-1,1- , the brackets R are relaxed portions and are secured to the longitudinal edges of the waist areas W of the serially-interconnected diapers 10 and the portions or lengths of the elastic strips indicated by the brackets S are stretched portions and are secured to the longitudinal edges of the cr~tch areas C
of the serially-interconnected diapers 10.
~ he means for alternately stretching and relaxing the predetermined lengths of the elastic strips is shown schematically herein as including the roll 30 connected to the end of a piston and cylinder device 31, 32 which, in turn, is suitably operated and controlled by a device (not shown) which will alternately move the roll 30 into and out of engagement with the elastic strips 16 for intermittently stretching and relaxing the elastic strips 16 so that intermittent stretched and relaxed portions or lengths S and R of the elastic strips 16 will be presentea to the above-described diaper assembly machine in position within the longitudinal edges of the diaper as it is being assembled. The specific design and operation of the mechanism for alternately stretching and relaxing the elastic strips 16 does not form a part of the present invention.
Thus, this invention has provided an improved elastic leg disposable diaper and process for manufacturing same which overcomes problems presented with prior art forms of such diaper and the process and apparatus involved particularly with the insertion of the elastic strips therein.
In the drawings and specification, there have been set forth preferred embodiments of the invention and although specific terms are employed, they are used in a generic and descriptive sense only and not for purposes of limitation.
. :-~', ' ' ~'-.. ~
Claims (8)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An improved elastic leg disposable diaper having a central crotch-fitting area and outer waist-fitting areas comprising:
a fluid-permeable top cover sheet;
a fluid-impermeable bottom cover sheet;
a fluid-absorbent interior pad positioned between said top and bottom cover sheets in superimposed position; and elastic strips extending and being secured to said diaper along the full length of the outside longitudinal edges of said diaper, and wherein said elastic strips are secured in said crotch area in stretched elastically-con-tractible condition forming gathered and extendible side portions in said crotch area for elastic conformance with the legs of the wearer, said elastic strips being secured to said diaper in said waist areas in less elastically contractible or relaxed condition so as to provide less or no gathering of the side portions in said waist areas.
a fluid-permeable top cover sheet;
a fluid-impermeable bottom cover sheet;
a fluid-absorbent interior pad positioned between said top and bottom cover sheets in superimposed position; and elastic strips extending and being secured to said diaper along the full length of the outside longitudinal edges of said diaper, and wherein said elastic strips are secured in said crotch area in stretched elastically-con-tractible condition forming gathered and extendible side portions in said crotch area for elastic conformance with the legs of the wearer, said elastic strips being secured to said diaper in said waist areas in less elastically contractible or relaxed condition so as to provide less or no gathering of the side portions in said waist areas.
2. An improved elastic leg disposable diaper, as set forth in Claim 1, in which said fluid absorbent interior pad extends to within approximately 3/4 of an inch of said elastic strips and is unsecured to said top cover sheet and said bottom cover sheet in said crotch area.
3. An improved elastic leg disposable diaper of generally hour-glass con-figuration defining outer waist-fitting areas and a central crotch-fitting area of reduced width and comprising:
a fluid-permeable top cover sheet;
a fluid-impermeable bottom cover sheet;
a fluid-absorbent interior pad positioned between said top and bottom cover sheets in superimposed position; and elastic strips extending and being secured to said diaper along the full length of the outside longitudinal edges of said diaper, and wherein said elastic strips are secured in said crotch area in stretched elastically-contractible condition forming gathered and extendible side portions in said crotch area for elastic conformance with the legs of the wearer and are secured in said waist area in less elastically-contractible or relaxed condition so as to provide less or no gathering of the side portions in said waist areas.
a fluid-permeable top cover sheet;
a fluid-impermeable bottom cover sheet;
a fluid-absorbent interior pad positioned between said top and bottom cover sheets in superimposed position; and elastic strips extending and being secured to said diaper along the full length of the outside longitudinal edges of said diaper, and wherein said elastic strips are secured in said crotch area in stretched elastically-contractible condition forming gathered and extendible side portions in said crotch area for elastic conformance with the legs of the wearer and are secured in said waist area in less elastically-contractible or relaxed condition so as to provide less or no gathering of the side portions in said waist areas.
4. An improved elastic leg disposable diaper, as set forth in Claim 3, in which said fluid-absorbent interior pad extends to within 3/4 of an inch of said elastic strips and is unsecured to said top cover sheet and said bottom cover sheet in said crotch area.
5. A process of securing elastic strips within longitudinal edges of elastic leg disposable diapers having central crotch-fitting areas and outer waist-fitting areas to form gathered and extendible side portions in the crotch area of the diapers during manufacture of such diapers; said process comprising the steps of:
feeding continuous elastic strips from a supply into desired position in contact within the longitudinal edges of the diapers, while effecting adhesive securement therebetween along the entire length of the edges; and alternately stretching and relaxing predetermined lengths of the continuous elastic strips during said feeding step for adhering the stretched lengths of the continuous elastic strips to the crotch areas and the relaxed lengths of the continuous elastic strips to the waist areas continuously along the longitudinal edges of the serially-interconnected diapers;
so that, the stretched lengths of the elastic strips will contract and form gathered and extendible side portions in the crotch area of the diaper.
feeding continuous elastic strips from a supply into desired position in contact within the longitudinal edges of the diapers, while effecting adhesive securement therebetween along the entire length of the edges; and alternately stretching and relaxing predetermined lengths of the continuous elastic strips during said feeding step for adhering the stretched lengths of the continuous elastic strips to the crotch areas and the relaxed lengths of the continuous elastic strips to the waist areas continuously along the longitudinal edges of the serially-interconnected diapers;
so that, the stretched lengths of the elastic strips will contract and form gathered and extendible side portions in the crotch area of the diaper.
6. A process, as set forth in Claim 5, further including the step of applying the adhesive continuously to the elastic strips during said feeding step along the entire length of the elastic strips.
7. A process of manufacturing elastic leg disposable diapers having a central crotch-fitting area, outer waist-fitting areas and elastically-extendible side portions in the crotch area and comprising the steps of:
superimposing a continuous fluid-permeable top cover sheet, a continuous fluid-impermeable bottom cover sheet and spaced-apart fluid-absorbent interior pads;
securing the top cover sheet and bottom cover sheet together along longitu-dinal edges and transversely between the interior pads to form serially-inter-connected disposable diapers;
securing elastic strips continuously along the entire length of the longidutinal edges of each of the diapers including feeding continuous elastic strips from a supply into desired position in contact within the longitudinal edges of the serially-interconnected diapers, while effecting adhesive securement therebetween, and alternately stretching and relaxing predetermined lengths of the continuous elastic strips during said feeding step for adhering the stretched lengths of the continuous elastic strips to the crotch areas and the relaxed lengths of the continuous elastic strips to the waist areas of the serially-interconnected diapers; and cutting the interconnected diapers transversely between interior pads to form individual diapers;
whereby, the stretched lengths of the elastic strips will contract and form gathered and extendible side portions in the crotch areas of the individual diapers.
superimposing a continuous fluid-permeable top cover sheet, a continuous fluid-impermeable bottom cover sheet and spaced-apart fluid-absorbent interior pads;
securing the top cover sheet and bottom cover sheet together along longitu-dinal edges and transversely between the interior pads to form serially-inter-connected disposable diapers;
securing elastic strips continuously along the entire length of the longidutinal edges of each of the diapers including feeding continuous elastic strips from a supply into desired position in contact within the longitudinal edges of the serially-interconnected diapers, while effecting adhesive securement therebetween, and alternately stretching and relaxing predetermined lengths of the continuous elastic strips during said feeding step for adhering the stretched lengths of the continuous elastic strips to the crotch areas and the relaxed lengths of the continuous elastic strips to the waist areas of the serially-interconnected diapers; and cutting the interconnected diapers transversely between interior pads to form individual diapers;
whereby, the stretched lengths of the elastic strips will contract and form gathered and extendible side portions in the crotch areas of the individual diapers.
8. A disposable elastic leg diaper, produced in accordance with the process of Claim 7.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US085,372 | 1979-10-16 | ||
| US06/085,372 US4325372A (en) | 1979-10-16 | 1979-10-16 | Elastic leg disposable diaper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1148701A true CA1148701A (en) | 1983-06-28 |
Family
ID=22191189
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000348631A Expired CA1148701A (en) | 1979-10-16 | 1980-03-28 | Elastic leg disposable diaper and process for manufacturing same |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4325372A (en) |
| JP (1) | JPS5668101A (en) |
| CA (1) | CA1148701A (en) |
| ES (1) | ES250538Y (en) |
| MX (1) | MX6612E (en) |
| ZA (1) | ZA801795B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5509915A (en) | 1991-09-11 | 1996-04-23 | Kimberly-Clark Corporation | Thin absorbent article having rapid uptake of liquid |
| US5618347A (en) * | 1995-04-14 | 1997-04-08 | Kimberly-Clark Corporation | Apparatus for spraying adhesive |
| US5683752A (en) * | 1992-12-16 | 1997-11-04 | Kimberly-Clark Worldwide, Inc. | Apparatus and methods for selectively controlling a spray of liquid to form a distinct pattern |
| US6037009A (en) * | 1995-04-14 | 2000-03-14 | Kimberly-Clark Worldwide, Inc. | Method for spraying adhesive |
Families Citing this family (29)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4450026A (en) * | 1979-12-21 | 1984-05-22 | Johnson & Johnson Baby Products Company | Method of forming a conformable garment with "killed" elastic portions |
| US4527989A (en) * | 1981-10-26 | 1985-07-09 | Colgate-Palmolive Company | Elasticized disposable diaper |
| GR79772B (en) * | 1983-03-18 | 1984-10-31 | Procter & Gamble | |
| SE446939B (en) * | 1983-05-24 | 1986-10-20 | Duni Bila Ab | INCINENTAL BLADE AND PROCEDURE FOR FIXING ELASTIC BANDS WITH A DIFFICULT BLADE |
| US4642109A (en) * | 1983-12-27 | 1987-02-10 | Paper Converting Machine Company | Method of making elastic diapers and product |
| US4846823A (en) | 1984-07-02 | 1989-07-11 | Kimberly-Clark Corporation | Diapers with elasticized side pockets |
| US5415644A (en) | 1984-07-02 | 1995-05-16 | Kimberly-Clark Corporation | Diapers with elasticized side pockets |
| US4880420A (en) * | 1984-08-17 | 1989-11-14 | Mcneil-Ppc, Inc. | Multiple strand elastic means |
| US4585447A (en) * | 1985-04-15 | 1986-04-29 | Colgate-Palmolive Company | Disposable diaper with intersecting stressed crotch and waist seals |
| US5324277A (en) * | 1985-09-13 | 1994-06-28 | Colgate-Palmolive Company | Diaper provided with an improved elastic fitting |
| US4726807A (en) * | 1986-04-10 | 1988-02-23 | Weyerhaeuser Company | Diaper with elastic margins |
| US5435806A (en) * | 1986-09-26 | 1995-07-25 | Colgate-Palmolive Company | Diaper provided with an improved elastic fitting |
| US4795451A (en) * | 1986-12-18 | 1989-01-03 | The Kendall Company | Absorbent pad |
| US5034008A (en) * | 1989-11-07 | 1991-07-23 | Chicopee | Elasticized absorbent article |
| USH1420H (en) * | 1992-04-30 | 1995-02-07 | Richardson; James W. | Method for attaching discrete, stretched elastic strands to predetermined isolated portions of disposable absorbent products |
| CA2090795A1 (en) * | 1992-11-19 | 1994-05-20 | Donald Joseph Sanders | Method and apparatus for sealing absorbent materials in an absorbent product |
| CA2090797A1 (en) | 1992-12-02 | 1994-06-03 | Mary Anne Bruemmer | Absorbent article having dual barrier means |
| US5895382A (en) | 1993-04-26 | 1999-04-20 | Kimberly-Clark Worldwide, Inc. | Foreshortened containment flaps in a disposable absorbent article |
| US5601544A (en) | 1993-12-23 | 1997-02-11 | Kimberly-Clark Corporation | Child's training pant with elasticized shaped absorbent and method of making the same |
| US5597437A (en) * | 1995-01-12 | 1997-01-28 | Procter & Gamble | Zero scrap absorbent core formation process |
| US5660657A (en) * | 1995-01-31 | 1997-08-26 | Kimberly-Clark Worldwide, Inc. | Composite method for fabricating garments |
| US5705013A (en) * | 1995-02-10 | 1998-01-06 | The Procter & Gamble Company | Method for manufacturing extensible side panels for absorbent articles |
| US7344524B2 (en) * | 1997-11-17 | 2008-03-18 | Kimberly-Clark Worldwide, Inc. | Disposable absorbent underpants |
| US7150731B2 (en) * | 1997-11-17 | 2006-12-19 | Kimberly-Clark Worldwide, Inc. | Disposable absorbent underpants |
| US6969441B2 (en) * | 2000-05-15 | 2005-11-29 | Kimberly-Clark Worldwide, Inc. | Method and apparatus for producing laminated articles |
| US6569139B1 (en) | 2000-06-22 | 2003-05-27 | Kimberly-Clark Worldwide, Inc. | Disposable absorbent underpants for containing body fluid |
| US8395013B2 (en) * | 2004-05-24 | 2013-03-12 | The Procter And Gamble Company | Method for proper placement and positioning of an absorbent article in an undergarment |
| US9682392B2 (en) | 2012-04-11 | 2017-06-20 | Nordson Corporation | Method for applying varying amounts or types of adhesive on an elastic strand |
| US9034425B2 (en) | 2012-04-11 | 2015-05-19 | Nordson Corporation | Method and apparatus for applying adhesive on an elastic strand in a personal disposable hygiene product |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US28139A (en) * | 1860-05-08 | Improvement in sewing-machines | ||
| GB1239736A (en) * | 1969-01-15 | 1971-07-21 | ||
| US3860003B2 (en) * | 1973-11-21 | 1990-06-19 | Contractable side portions for disposable diaper | |
| US3984272A (en) * | 1974-07-25 | 1976-10-05 | Riegel Textile Corporation | Method and apparatus for successively forming disposable diapers |
| US4081301A (en) * | 1975-10-30 | 1978-03-28 | The Procter & Gamble Company | Method and apparatus for continuously attaching discrete, stretched elastic strands to predetermined isolated portions of disposable abosrbent products |
| US4050462A (en) * | 1976-03-29 | 1977-09-27 | Kimberly-Clark Corporation | Disposable diaper with elastically constricted crotch section |
| US4205679A (en) * | 1976-07-23 | 1980-06-03 | Johnson & Johnson | Disposable undergarment |
-
1979
- 1979-10-16 US US06/085,372 patent/US4325372A/en not_active Expired - Lifetime
-
1980
- 1980-03-26 ZA ZA00801795A patent/ZA801795B/en unknown
- 1980-03-28 CA CA000348631A patent/CA1148701A/en not_active Expired
- 1980-05-06 ES ES1980250538U patent/ES250538Y/en not_active Expired
- 1980-05-28 MX MX808849U patent/MX6612E/en unknown
- 1980-10-15 JP JP14310180A patent/JPS5668101A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5509915A (en) | 1991-09-11 | 1996-04-23 | Kimberly-Clark Corporation | Thin absorbent article having rapid uptake of liquid |
| US5683752A (en) * | 1992-12-16 | 1997-11-04 | Kimberly-Clark Worldwide, Inc. | Apparatus and methods for selectively controlling a spray of liquid to form a distinct pattern |
| US5618347A (en) * | 1995-04-14 | 1997-04-08 | Kimberly-Clark Corporation | Apparatus for spraying adhesive |
| US6037009A (en) * | 1995-04-14 | 2000-03-14 | Kimberly-Clark Worldwide, Inc. | Method for spraying adhesive |
Also Published As
| Publication number | Publication date |
|---|---|
| MX6612E (en) | 1985-08-16 |
| US4325372A (en) | 1982-04-20 |
| ZA801795B (en) | 1981-10-28 |
| ES250538U (en) | 1980-07-16 |
| JPS5668101A (en) | 1981-06-08 |
| ES250538Y (en) | 1981-01-16 |
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Legal Events
| Date | Code | Title | Description |
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| MKEX | Expiry |