US3163350A - Carton - Google Patents

Description

J. A. ZINN Dec. 29, 1964 CARTON 2 Sheets-Sheet l Filed March 5, 1962 i l l Dec. 29, 1964 J. A. ZINN 3,163,350

CARTON Filed March 5, 1962 2 Sheets-Sheet 2 Hu &

Il [mi mi United States Patent O 3,163,356 QAR'IGN lutins A. Zinn, 3%() W. North Ave., Stone Park, Ill. Filed Mar. 5, 1952, Ser. No. 177,388 2 Claims. (Cl. 229-48) My invention relates to a carton made of paper or the like and is intended for use as a container for various uses and purposes, including milk and other liquids for transportation as units and also may be used for various kinds of frozen foods, as well as powdered and desiccated substances of various types and kinds and also may be used for the packaging of small hardware materials such as nails, screws, or the like.

Another object of my invention is the provision of a carton made of paper which can be formed on location from blanks and folded in such manner that sides and end portions are fashioned into a leak-proof package construction, particularly at the bottoms of the packages where leakage of iiuids usually takes place.

Another and further object of my invention is the provision of a carton, particularly for use in handling tluids and in which certain portions of the flexible material of which the carton is composed are folded inward in overlapped relation with each other to form a bottom for the carton in which the surface levels of portions of the inwardly folded material are raised to a level corresponding to the level of the adjacent material so that when the surfaces are glued together, the overlapped surfaces are sealed so tightly that leakage will not result.

Another and further object of my invention is the provision of a carton having a leak-proof bottom construction and also having a bottom which is in a common plane on its outside surface so that the package when stood on end will remain and which when racked together will present a solid package without rocking or the like.

Another and further object of my invention is the provision of a liquid container in carton form having a bottom formed of a plurality of inwardly folded and overlapped iaps or extensions cemented or glued together under considerable pressure against the end of a mandrel about which the carton is formed, the end of the mandrel having a plurality of recesses therein of varying contours and depths to receive various groups of designated superimposed iiaps and tabs so that when complete the bottom of the carton is so formed that it has a shallow depth plane simulating an integrally formed bottom to provide strength and secure closure against leakage.

Another and further object of my invention is the provision of a carton both for the transportation and marketing of fluids such as milk and the like, as well as frozen foods and hardware, in which the side walls are strengthened by providing doubled wall material by making the walls of a plurality of thickness of material and thereafter folding and placing the additional thickness of material in such manner that it forms a liner for the carton thereby enabling a carton which is suciently strong for the handling of milk and the like in gallon size cartons, if desired.

Another and further object of my invention is the provision of a carton having double side walls which is sufiiciently strong so that when fashioned into a carton the double wall thickness will sustain a heavy load of material without bulging outwardly, thereby preventing the close packing of filled vcartons into larger units for shipping and handling purposes.

Another and further object of my invention is the provision of a double wall carton in which a liner for the main body is provided providing a double walled thickness in which the grain of the liner and the grain of the outer walls of the container may be crossed at a right .angle to each other thereby providing a much stronger FIG. 3 is an elevational view of the bottom of the` carton illustrating the partially formed bottom end after the initial step has been taken to form the bottom.

FIG. 4 is an end view of the carton with the overlapped bottom flaps on the front and rear walls inwardly folded in overlapped relation with each other.

FIG. 5 is an elevational view of the bottom of the carton at the completion of the steps described in FIGS. 2,

3, and 4. f

FIG. 6 is a sectional view across the bottom of a double Walled carton taken on line 6-6 of FIG. 5.

FIG. 7 is a cross sectional front-to-rear view taken on line 7-7 of FIG. 5.

FIG. 8 is a cross sectional View taken from the front to rear of the carton on line 8 8 of FIG. 5.

FIG. 9 is a sectional View taken on line 9 9 of FIG. 1 showing a double walled carton.

FIG. 10 is an elevational view of thev outer face of a blank from which either a single walled .or a double side walled carton may be fashioned.

FIG. 11 is an elevational view of the outer face of a liner which is fitted against'the inner face of the blank as shown in FIG. l() yto form a double walled structure;

and

FIG. 12 is a view showing the liner combined with the blank shown in FIG. l() with the outer face of the blank of FIG. l1 applied to the inner face of the blank shown in FIG. 10 prior to the combined blanks being fashioned into a double walled structure. i

Referring now specifically to the drawings and in which like reference characters refer to like parts throughout, a carton 1t) is shown which is fashioned from a carton blank lta shown in elevation in FIG. 10 of the drawings, and which consists of a front panel 11, a pair of side panels 12 and 13 connected to the front panel at its side by crease lines 14 and 15 extending vertically of the blank 10a on each side of the front panel 11. A pair of narrow panels 16 and 17 are provided at each side of the blank lila and which are secured to the side panels 12 and 13 by crease lines 1S and 19 extending vertically of the blank 10a, the side panel 17 being serrated along its outer free edge for a double Walled carton as hereinafter described, but should be straight for a single walled carton. When the blank lila is folded into the carton 1i), the panels 16 and 17 overlap each other at their outer edges a sufficient distance to form a strong joint and are glued together thereby forming a rear panel having the same width and contour as the front panel 11 in the final assembly yof the carton, and providing a seam which extends centrally of the carton 10 throughout its entire length.

The lower end portion of the blank lila, designated as a whole as 20, is an extension of each of the panels hereinabove described, and is defined by a crease line 21 extending across the blank 19a and across the vertical crease lines 14, 15, 1S, 19 which form a plurality of iiaps and tabs hereinafter described and which, when folded e inward in certain superimposed relations with each other on the crease line 21-after the blank 19a has been folded along the vertical crease lines and glued together in a Vrectangular form, forms the bottom of the carton.

An upper portion of the blank lita designatedas a whole as 22, is provided which has a crease line 25 lextending transversely across the blank lila and which marks the division of the extensions of the panels 11, 12, 13, 16 and 17 to form a top closure for the carton 1t) when fashioned into form, and also a pour spout for the carton after the carton has been opened for use. A second transverse crease line 26 extends across the blank 16a which is spaced outward. from the crease line and deiines a plurality of tabs (hereinafter described) which extend outward from the flaps defined by the score lines 14, 15, 18, and 19 which form a top closure for the carton 1t?. The crease lines 21, 25 and 26 are slightly curved with respect toa base line substantially horizontal to each of these crease lines as they f `crossV the front panel 11 at its top and bottom because the panels 11, 12, 13, 16 and 17 are slightlyfnarrower at their lower ends than at their upper ends thereby producing a carton 10 which is slightly greater in cross sectional area at its top thany at the bottom and therefore the carton is'slightly tapered for easy shipment and handling, although the panels may be straight sided if desired, thereby producing a straight sided carton.

The verticalV crease lines 14, 15, 18 and 19 and the horizontal crease lines 21, 25 and 26 are secured by the use of scoring or crease rules applied edgewise to the outside surface of the blank 16a on selected lines over slots or shallow grooves in a die`supporting the blank 10a outer face of the blank 19a with corresponding, very l slight elevated "ribs being formed on the innerfface of the blank 10a. The blank 10a is thereafter folded inward about a mandrel` lb illustrated and described in my copending applicationV Serial` No. 177,389 tiled March 5, 1962, and the working end of which mandrel is shown in FIGURE 2, to ultimate form by pressure applied to the outside of the blank 10a thereby folding it around the mandrel 10b and around the corners of the mandrel 10b which produces sharp, right outside angled corners on the carton 10, with the inside corners being slightly rounded in either a single or double Vwalled structure and therefore the `fibres of the paper are not broken, but are compressed and slightly deformed thereby retaining Vthe ,full tensile strength of the material, andr producing neat appearing outside corners.

A flap 27 is formed at the lower end of the front panel 11 with sealing tabs 28 and 29. thereon at each side of the liap 27 with the crease lines 14 and 15 extending between the flap 27 and the sealing tabs 28 and 29. A

serrated area 3d is provided on the flap 27 having the serrations extending longitudinally of the flap 27 'with similar serrated areas 31 and 32 on the sealing tabs 28 and 29 respectively having the serrations extending transversely of the said tabs. The serrated areas 30, 31 and 32 are formed by pressure dies having spaced teeth thereon with valleys therebetween preferablyrapplied tov the outer faces of the ap 27 and tabs 28 and 29 which deforms the flat surfaced blank of these areas on both sides into ribs and valleys, the function of which tabs and valleys are more fully described hereinafter.

A liap 33 is provided at the end of the side panel'12, flap 33 having'a base portion 34 defined by crease line 21 and diagonal crease lines 35 and 36 with slits 37 and 38 continuing from the ends of the crease lines 35 and 36 outward which separates the major portion of the flap 33 from the sealing tab 29 along one of its sides with a sealing tab 39 being formed on the opposite side of Y 4 blank 10a is fashioned into a carton 10, forms a part ofthe bottom of the completed carton 10.

A liap 41 is provided on the lower end of the panel 13 and is defined by the crease line '21 and short angularly extending crease lines 42 and 43 on each side of the base portion 44 of the flap 41 and is severed at 45l and le at each oftits sides which separates the major portion of the flap i1 from-the sealing tab 28, and from a sealing tab 47 on the side of the flap 48 formed as an extension of the panel 16 and defined by the crease lines 13, 21, and 43 and is severed from the major portion of flap 41 at 46, bothof which fiaps 41 and 48 form a part of the bottom of the assembled carton 10 as hereinafter described.

The panel 17 is provided with a serrated edge 49 for use in a double walled carton and is underlapped against the inside face of a portion of the panel 16 to form a back panel of width and contour equal to the front panel 11 as hereinafter described.

The top portion 22 of the blank 10a above the crease line 26 hasl a plurality of extensions thereon which, when folded on the crease lines hereinafter described, forms a closure for the top of the carton which, when folded and broken at designated places and parts of the extensions rearranged, forms a pouring spout for the contents of the carton.

A flap 5ft is formed as an extension of the frontV panel 11 as defined by the cross crease line 25 and the vertical crease lines 14 and 15, and has a portion 51 thereon defined by the crease line 26 and a second crease line 52 which is perforated partially of its length at 53 to form a tear line with a tab 54 at the outer side of the portion 51 defined by the crease line 52 with a diagonal crease line 55 tbereacross with a short diagonal create line 56 extending across the portion 51.

A ap 57 is provided which is an extension of the side panel 12 and is defined by the crease lines 15 and 19 at each of its sides and has crease lines .and 59 therein extendng diagonally partially thereacross which intersect each other at the crease line 26 and merge into a straight crease line 60 extending across a tab 61, which separates the tab V#51 into twov sections 62 and 63 respectively. A liap 64 is formed as an extension of the side panel 13 and is defined by the horizontal crease line 25 and the vertical crease lines 14 and 13 and has two diagonal crease lines 65 and 66 extending from the lower outside corners of the flap 64 inwardly and upwardly to the crease line 26 and to a vertical crease line 67 extending across a flap 6d dividing the ap 68 into two sections 69 and 79. i

A flap 71 is formed at the upper end of the panel 17 and is definedby the vertical crease line 19 and the free edge of the panel 17 and has the crease line 26 extending across the flap 71 with a portion 72 at the outer side thereof divided into two sections 73 and 74 by a short crease line 75 md having a tab 76 on its outer edge connected with the portion 72 by a crease line 77 which is perforated at 78 for a portion of its length to form a tear line when the closed and sealed carton is opened. A diagonal crease line 79 extends across the tab 76 and to the crease line 77 which divides the tab 76 into two sections Si) and 81. A ap 82 is formed at the end of the panel 16 which is defined by the crease lines 1S and 25 with a section 63 thereon defined by the crease lines 25 and 18 and having a tab 84 thereon defined by a crease line 85.

The blank lita as hereinabove described with a straight side to the panel 17 instead of a serrated one, when folded and the bottom portions fitted together forms a single walled carton open at the top and ready to be filled. After the carton is filled the top portion 22 is folded and sealed, or stapled, and the' lledV carton is ready for shipping. When a double walled carton is desired, a liner, designated as a whole as S6, is applied to the blank 19a having a serrated edge 96 at one side thereof, by being laminated or glued thereto by the usual blank laminating or strip laying machine, as shown in FIG. 12 where the liner 86 is shown tted against the inner surface of the blank 19a, with the liner 36 being reversed relative to its position as shown in FIGS. 1 and 2, and is slightly lesser in length than is the distance between the transverse fold lines 21 and 2o' in the blank 10a to permit the closure aps on the ends of the blank 19a to be folded over the ends of the liner 86.

The liner 86 is made with the grain of the paper eX- tending in a verticd direction thereby crossing the grain of the paper from which the outer blank'tla is made at a right angle, which blank 10a is made with the grain of the paper extending horizontally thereby increasing the strength of the side walls of the carton and providing a carton which may be made in gallon sizes if deshed for marketing ordinary liquids such as milk, and in small sizes for other liquids heavier than water, or other liquids as well as metal articles. The bottom and top construction is suiiciently strong to support the load of a large sized container such as a gallon or half gallon size.

The liner S5 is composed of a plurality of panels S7, 8S, 89, 90 and 91 with crease lines 92, 93, 94 and 95 with the free edge 95 of the liner 86 being serrated to match the serrated edge 49 of the blank 19a, which serrated edges are fitted together when the carton blanks are fashioned into a carton, and terminates at its upper and lower ends at the inner edges of the crease lines 21 and 25 to permit the inward folding of the flaps and tabs on the ends of the carton. f

v The crease lines 92 to95 inclusive on the liner S6 are` produced in the same fashion as are the crease lines on the blank 16a except that they are produced with a rule having a slightly greater thickness. If a No. 2 rule is used on the blank 19a, then a No. 3 rule would beproper for use on the liner S6. The rules are applied to the outer face of the liner 36 and produce a very slight depressed line area on the outer face of the blank with very slightly elevated ribs on the inside surface. When the liner 85 and the blank 19a are secured together, the outer face of the liner 85 is placed against the inner face of the carton blank with the ribs along the crease lines in the carton blank tted into the depressed lines in the liner 86, with the top edge of the liner 86 being substantially in register with the lower edge of the crease line 25 in the blank 10a, and the bottom of the liner 85 being substantially in register with the top of the crease line 21, with the ends of the liner 86 forming breakers over which the bottom portion 2i? and the top portion `22 of the blank 19a is folded during the completion of the carton and the closing of the filled carton. In this position the blank 19a and the liner Se are iirmly laminated or glued to each other by the usual blank or strip laying machine thereby forming a unitary structure.

In fashioning the blank 16a into a carton for filling, the blank 10a is first folded around a rectangular shaped tapered mandrel 1Gb and bent rst at the crease lines 14 and 15 with the inner face of the panel 11 being tted against the face of the mandrel and the blank 19a is then folded on the crease lines 18 and 19 with a portion of the panel 16 on its free edge placed in overlapping engagement with the panel 17 which has straight side edges for the single walled carton with the edges overlapped a suicient distance to form a strong side panel and the overlapped portions glued together by pressure against the mandrel with glue having been previously applied to one or both of the meeting faces. The overlapping panels 16 and 17 centrally of the carton with a central seam reduces the quantity of material required for a carton and enables a strong seal to be made where pressure can be more easily applied than if a seal were made at the corner of a carton.

In fashioning the double walled carton, the combined blank 19a and liner 86 are folded around the rectangular 6 shaped mandrel 10b with the combined panels 11 and 89 being rst placed against one face of the mandrel and thereafter the combined panels 12 and liner panel 88 and combined panels 13 and 9d are placed in position on the sides of the mandrel, and thereafter the combined panels 16 and 91 and 17 and 87 folded inwardly against the other face of the mandrel with the edge 95 of the panel 91 underlying the panel 16 and spaced from the outer edge thereof and the serrated edge 49 of the panel 17 overlaying the liner panel S7 and spaced from the free edge thereof Vthe same distance as is the serrated edge 95 on the panel 91 from the free edge of the panel 15. In this manner the serrated edge 49 on the panel 17 is interiitted into the serrated edge 96 on the panel 91 of the liner with a portion of the panel 17 of the liner underlaying the joint of the serrated portions of the liner and carton and a portion of the panel 16 overlays this junction with the engaged surfaces being glued together with fairly heavy pressure thereby forming a very strong junction at this point.V The interlocking of the .serrated edges produces a saw-toothed design which provides rigidity to the seam, also provides a staggered or -oiset seam because both the liner and the carton body are sealed together along an offset line. The tting together of the two saw-toothed portions insures proper registration in the body seaming operation and prevents creeping of the seam in either direction and insures good folding of the bottom flaps in the fashioning of the carton Y and of the bellows top when the carton is closed after `iilling. The mandrel 10b must be made slightly smaller in both transverse directions so as to accommodate the liner 86 within the` blank 19a so the panels of the blank 10a are not forced outward and out of shape when the liner is placed in position. Y p

The lower end of the mandrel 1Gb is formed with a plurality of surfaces thereon having varying depths, the

depths of the surfaces and the elevated portions of this bottom being designed to receive certain designated aps and tabs on a carton blank as hereinabove described so that in the formation of the bottom a fiat-,faced pressure die may be used to seal these various flaps together and at varying levels depending upon the position of the flaps and whether they overlap each other when folded together so that when pressure is applied by the fiat-faced die on the end of the carton, such pressure is'applied equally over the entire bottom area of the carton, thereby forcing the glue-carrying faces of the aps together very firmly and providing a bottom for the carton which is completely sealed against leakage of duid from the carton after being fashioned and glued together. The end surface of the mandrel liib has a rib 97 on one side and a pair of short ribs 98 and 99 on its opposite side, which ribs 97, 98 .and 99 define the top most level of the end of the mandreli An area 10i) is provided between the short ribs 98 and 99 of the same width as these said ribs and one thickness of carton material below the level of the ribs 98 and 99. A pair of ribs 101 and 102 spaced from each other extending from front to rear centrally of the mandrel 1Gb between the ribs 97 on one side and the two ribs 9% and 99 on the opposite side 'are provided, these ribs being lower by two thicknesses of blank material than is the surface of the ribs 97, 98 and 99 and also one thickness of blank material lower than is the area 100, and with a central rectangular area 103 which is defined by a rib 104 connecting the ribs 161 and'102 at one side of the mandrel face and terminating adjacent the depressed area 1111) between the rib portions 98 and 99.

At the edges of the mandrel on the outer side thereof is Ia plurality of rectangular spaces `1115, 196, 107 and 198 which spaces have a depth the same as the area 1613 and are deinedby the ribs 101 and 102 and at their inner edges and partially on their sides by the ribs 97, 98 and 99. Between these areas on each of their sides are rectangularrecesses 109 and 110 which are defined at their inner edge by the ribs 191 and 102, at their sides by the areas 105 and 106 and by 107 vand 10S respectively, and have the greatest depth of any of the recesses which appear on the end of the mandrel and which are the greatest in depth because when the flaps and tabs are folded inward to form the bottom of the carton, the'materialforming the bottom at these particular points consists of five layers of material in thickness.

Triangular shaped recesses 111, 112, 113 and 114 are formed on the outer edges of the mandrel kat the corners thereof with the recess 111 being defined by the rib 97 and space 106, the rib 97 and space 108, the rib98 and space 105, and by the rib 99 and space 107. These triangular shaped recesses 111, 112, 113, and 114 are the same depth as is the area 103, are two thicknesses of material below the line of the ribs 97, 93, and 99, and one thickness of material less in depth thanV are the adjacent spaces 105, 106, 107 and 10S and are adapted to receive the inwardly folded triangular ends of the sealing tabs 28 and 47 and 29 and 39 as hereinafter described. 'Ille recesses Vherein described are all graduated in depth to accommodate varying pluralities of superimposed inwardly folded flaps and t-abs so that when folded inward and glued together the outer surface of all the inward folded tabs will dene substantially a plane surface.. In providing a mandrel of this type, a flat-faced former 'can be used so that the entire bottom surface of the carton is subjected to` equal pressure, thereby insuring that these surfaces are all firmly glued together and anon-leakable bottom is provided for the bottom. This' effect could be Vequalled by using -a plane-faced inside mandrel about which the carton Was formed and providing a die having a face corresponding to the contour of the mandrel, but I find that better results `are secured by providing various depths of recesses in the mandrel and a plane-faced die to secure the best results both as to sealing and strength.

After the carton yhas been formed into-tubular form about the mandrel, with either a single or double sided Wall, the bottom is next formed, first by the application of glue to the inner faces of thesealing tabs 39 and-47 and second by inwardly folding the combined iiaps 40 and 43 which have previously been glued together on a median vertical line onto the end of the mandrel in such position that the entire end of the mandrel is covered except the rib 97 and recesses 111 and 112. This action also results in the inward turning of the tabs 39 and 47 on portions of the fold lines 18 and 19 and on the'diagonal fold lines 36 and 43 so that the inner faces of these` tabs 39 and 47 to which glue has been applied, are against the inner faces of-parts of the base portions 34 and 44 of the ii- aps 33 and 41, and `also brings the inner faces of the triangular ends of the tabs 39 and 47 into engagement with the inside faces of the adjacent triangular portions of the bases 34 and 44 of the sealing liaps 33 and 41 to which the tabs 39 and 47 `are connected. lGlue has previously been applied to the inner faces of the tabs 39 and 47. This movernent brings the double thickness of the overlapped iiaps 40 and 43 onto the area 100 on the mandrel `with the edge of the flaps 40 and 48 terminating short of the rib 97 with the base of the aps 40 and 4S in'engagement with the ribs 93 and 99 and overlying the balance of the surface of the end of the mandrel, with the exception of the rib 97 and recesses 111 and 112. Y

The next movement isrthe inward folding of the flap 27 over the rib 97 on the mandrel and Onto the outer surface of the major portion of the combined flaps`40 and 48 which superimposes the flap 27 over the entire surface of the mandrel except the area` 100, the ribs 98 `and 99 and the triangular recesses 113 and 114, and also turns the tabs 28 and 29 inwardly'on the fold lines 14 and 15 and `also on the diagonal fold lines 35 and 42, which movement overlaps the serrated portionsof the tabs 28 and 29 over the ends of the tabs 39 and y47 and the serrated portion 30 of the flap 27 over the junction line ofV the .flaps 40 and 48 and forces the faces of the triangular ends of the base of the flaps 33 and 41 into engagement 8 with each other, inwhich position the tabs 39 and 47 and 28 and 29 are in parallel planes with the outwardly projecting tabs 33 and 41.

The last and final stepin the formation of the carton is the inward folding of the flaps 33 and 41 and also the inward folding of the overlapped tabs 39 and 47y and 28 and 29 against the outer surface of the flap 27, with the ap 33 overlying the serrated portion 30 of the liap 27 with glue having been applied between these parts and the entire end portion is thereupon subjected to pressure by a flat-surfaced die pushing the inwardly `folded portions Very firmly together and gluing their contacting surfaces together in such fashion that the carton is now ready to bev lled and the bottomof the carton so securely sealed that leakage will not result.

When glue is applied to the inner faces of the tabsV 28 and 29 and to the inner face of the flap 27, additional glue is deposited in the valleys of the areas 30, 31 and 32. A s the flap 27 is pressed against the cornbined iiaps 40 and 48, the glue in the valleys of the'area 30 is forced onto the flap 40 along the edge of the llap 48 and also onto the edge of the liap 48 which results in a firm glued joint of the area 30 to prevent leakage outwardly therefrom while the ribs are tightly glued to the face of the ap 40 preventing transverse leakage along the edge of the flap 43. The same condition exists at the overlapped ends of the tabs 28 and 47 and 29 and 39-where the previously applied gluel in the valleys of the serrated areas 31 and 32 is deposited at the ends ol' the tabs '47 and39 where they are overlapped by the tabs 23 and 29 so that leakage along the valleys Vis prevented. The tops of the ribs of the areas 31 and 32 are also ealsed to the faces of the aps 33 and 41 Vextend acrossV the seal line of the ends of the tabs 29 and 39 and 28 and 47, thereby preventing leakage at these points. I have found in the past that leakage from filled cartons may occur at these three points and that use of the serrated areas prevents such leakage.

1t will be thus understood as the flaps and tabs are inwardly folded and superimposed on each other to produce a bottom end closure for the carton, the plies of material'are built up from a single ply over the ribs 97, 93, and 99 to a five-ply depth over the recesses 109 and 110 until the outer surface of the bot-tom closure, to which pressure is affixed by a sealing die, presents a surface which substantially isin a single plane so that equal pressure is applied on the carton bottom, thereby forcing the surfaces into intimate contact with each other by a die block having a Working surface in a single plane.

The surfaces 109 and 110,therefore have live plies of material thereover, the surfaces 105, 106, 107, and 10S and the corner surfaces 111, 112, 113, and 114 have three plies ofmaterial thereover, the surface 103 has four plies thereover,the surfaces 101, 102 and 104 have three plies thereover, the section has two plies thereover, and the ribs 97, 98, and 99 have only a single ply thereover so that when the combination is forced against the end of the mandrel with considerable pressure, the outer end of the bottom of the carton is substantially in a single plane and every area of the lbottom has been subjected to uniform pressure, which has not been the practice heretofore in the making of these cartons. There will be some slight bending of the flaps and tabs, but not enough to materially affect the secure sealing together of-various flaps and tabs.

While 1 have described more or less precisely the method employed and the apparatus used therewith, I do not wish to be understood as limiting myself thereto, as I contemplate changes in form and the proportion of parts and the substitution of equivalents as circumstances may suggest or render expedient without departing from the spirit or scope of my invention.

What is claimed is:

l. An open ended carton of thin, foldable material having a front panel portion, side panel portions, and

a rear wall portion composed of panels overlapped at their side edges and secured together throughout the length of the carton and having integrally formed flaps at the top thereof to form a bellows closure for the cornpleted carton, and a bottom for the carton composed of a flap integral with the rear wall portion having tabs at each of its sides and turned inward to form a bottom portion for the carton, a flap integral with the front panel having a serrated area thereon, the serraitions of which area extend longitudinally of the flap, the said flap having tabs at each of its ends having serrated areas thereon, the serrations of which extend transversely of the said tabs, the said ilap and tabs being inwardly folded against the outer faces of flap and tabs on the rear wall portion and glued thereto with the serrations on the bottom flap secured to the front Wall panel overlying and extending across the edge of the overlapped outer panel of the rear wall portion and the serrations of the tabs on the bottom flap integral with the front panel overlapping and extending across the ends of the tabs on the sides of the bottom liaps integral with the rear wall portions and foldable aps on each of the side panels 'being inwardly folded and secured to the outer face of the bottom flap integral with the front wall portion of the carton.

2. An open ended carton integrally formed of a thin material folded into a generally rectangular form having a front panel portion, side panel portions and a composite rear wall portion consisting of two panel portions overlapped in their free edges and secured together in the form of a seam through their lengths, the said panels having integrally formed flaps at the tops thereof to form a bellows closure for the completed carton, and a bottom for the carton consisting of a flap portion integrally formed with the composite rear wall and having integrally forrned tabs at each of its ends, the said flap portion and tabs being inwardly folded to form a portion of the bottom of the carton, the said front panel portion having an integrally yformed bottom flap thereon with integrally formed foldable tabs at each end of the said bottom flap, the said bottom ap having a group of serrations -thereon extending longitudinally thereof, the said group being composed of a plurality of individual serrations in parallel side-to-side relation with each other and extending -transversely of fthe said liap, each of the said tabs on the ilap forming a part of the front panel also having a group of serrations thereon extending longitudinally thereof, each group composed of individual serrations in parallel extending side-to-side relation with each other transversely of the said tabs, the said bottorn llap on the front panel portion being inwardly folded against and secured to 'the outer faces of the bottom flaps integral with the outer faces of the bottom flaps of the rear wall portions with the individual rows of serra-tions extending over and spanning the majorpart of the side edges of overlapped flaps on the rear Wall portions, the foldable tabs at each end of the flap in the front wall and the foldable tabs at the sides of the flaps of each of said side wall panels being folded together `in overlapped relation with the individual serrations overlying and spanning the ends of the underlappedtabs, and aps integrally formed in the bottoms of the side wall portions inwardly folded against the flap on the front wail whereby a bottom for the carton is produced.

References (lited in the file of this patent UNITED STATES PATENTS 732,862 Jones July 7, 1903 1,303,687 Leler May 13, 1919 1,546,725 Gaylord July 21, 1925 1,959,193 Boeye May 15, 1934k 2,017,810 Boder et a1. Oct. 15, 1935 2,390,909 Zinn Dec. 11, 1945 2,501,852 Ringler Mar. 28, 1950 2,998,178 Jacke Aug. 29, 1961

Claims (1)

1. AN OPEN ENDED CARTON OF THIN, FOLDABLE MATERIAL HAVING A FRONT PANEL PORTION, SIDE PANEL PORTIONS, AND A REAR WALL PORTION COMPOSED OF PANELS OVERLAPPED AT THEIR SIDE EDGES AND SECURED TOGETHER THROUGHOUT THE LENGTH OF THE CARTON AND HAVING INTEGRALLY FORMED FLAPS AT THE TOP THEREOF TO FORM A BELLOWS CLOSURE FOR THE COMPLETED CARTON, AND A BOTTOM FOR THE CARTON COMPOSED OF A FLAP INTEGRAL WITH THE REAR WALL PORTION HAVING TABS AT EACH OF ITS SIDES AND TURNED INWARD TO FORM A BOTTOM PORTION FOR THE CARTON, A FLAP INTEGRAL WITH THE FRONT PANEL HAVING A SERRATED AREA THEREON, THE SERRATIONS OF WHICH AREA EXTEND LONGITUDINALLY OF THE FLAP, THE SAID FLAP HAVING TABS AT EACH OF ITS ENDS HAVING SERRATED AREAS THEREON, THE SERRATIONS OF WHICH EXTEND TRANSVERSELY OF THE SAID TABS, THE SAID FLAP AND TABS BEING INWARDLY FOLDED AGAINST THE OUTER FACES OF FLAP AND TABS ON THE REAR

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