US2516820A - Lined carton - Google Patents

Description

y 1950 J. w. wlLs fN 2,516,820

LINED CARTON med Dec. 2a, 1946 INVENTOR.

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. end and dispose Patented July 25, 1950 UNITED STATES PATENT OFFICE LINED CARTON John W. Wilson, Middletown, Ohio, assignor to The Interstate Folding Box Company, Middletown, Ohio, a corporation oi Ohio Application December 26, 1946, Serial No. 718,300

Claims. (01. 229-14) Packages comprisingan outer paperboard foldins carton and an inner liner have come into widespread use for the protection of various contents, mostly foodstuifs. The carton is usually of tubular form with enclosing body walls having closure flaps at the ends of the body walls. The liner is a tubular structure of flexible sheet material projecting beyond the body walls at one or both ends. The walls of the liner are adhered to the body walls of the carton so that when the carton is squared up or erected the liner is likewise squared up and hence opened for filling.

In the preferred type of package, the liner has already been closed at the bottom, forming a bag. But since the closed bag end projects beyond the body walls, it is necessary to fold the projecting it within the confines of the carton cross-section before the carton flaps can be closed. This is time-consuming and inconvenient if done by hand; and if done by machine it requires a duplication of apparatus elements or a duplication of the use of folding elements provided for the top of the package.

The primary object of this invention is the provision of a lined, four-panel carton, the liner having a closed end, and the parts of the structure being so related that the act of squaring up the carton produces an automatic folding of the closed liner end.

This and other objects of the invention which will be set forth hereinafter or will be apparent to one skilled in the art upon reading these specifications, I accomplish by that structure and arrangement of parts of which I shall now describe certain exemplary embodiments. Reference is made to the accompanying drawings, wherein:

Figure l is a plan view of a carton blank with which a liner is associated.

Figure 2 is a plan view of the liner itself. Figure 3 is a plan view of the tubes lined carton. Figures 4, 5 and 6 are partial perspective views showing stages of erecting the carton, and the action which thereupon ensues automatically.

Figure 7 is a partial'perspective view showin a the fully erected carton and the fully folded liner end.

Figure 8 is a plan view of a liner of somewhat modified form.

In Figure 1, I have shown a carton having body walls I, 2, 3, and l and a glue flap 5. Short flaps 6 and I have been shown at the ends of the body walls I and 3, while the body wall 2 carries a tuck flap 8. This flap arrangement is exemplary only. Others may be employed including the well known seal-end flap construction at one or both ends of the cartons.

A liner 5 is indicated as positioned on the carton blank in such a way that the carton may be tubed about it, as by folding over the walls 4 and I and adhering the glue flap 6 to the free edge of the wall I. The liner 9 is a tubular member made of any suitable flexible sheet material. The liners hereinafter described may be cut from sheets and individually tubed, or as is preferable, the flexible material in strip form may be tubed about a former with an appropriate, adhesively secured, longitudinal seam. The bag tube thus formed will be cut apart into suitable lengths.

My lining structures are closed at one end, which may be done by the application of adhesive, or the heat sealing of a thermoplastic substance constituting or carried as a coating by the flexible material.

For methods and means for forming liners and for associating them with cartons, reference may be made to the following patents: Re. 20,789, 2,099,257, 2,114,621, and 2,166,388. The procedures there outlined may be followed by me with only such changes as are necessary to form the particular shapes of end closures hereinafter described, and to cut the flexible material accordingly. My formed liners or bags may be combined with cartons in the usual ways. The walls of my liners will be adhered to the body walls of the cartons as is usual, with appropriate care to make sure of proper adhesion adjacent the ends of the body walls next the closed end of the liner.

My lining structures, however, depart from those hitherto current in the art in that the seam forming the bottom closure in the flat tube i not rectilinear, but on the contrary is shaped or angular. The liner 9 is provided with a closure seam II, which as shown is substantially rectangular in'conflguration with the legs of the angle located at about 45 degrees to the longitudinal axis of the bag.

The liner will be associated with the carton in such a way that the ends of the liner closure seam come closely adjacent the ends of the body walls, as will be seen from Figures 1, 3, and 4.

when the structure. illustrated in these figures is erected or squared up, a self folding action occurs in the liner. The liner seam will begin to kink or bend along one of the seam legs, as shown at il in Figure 5. As the squaring up action proceeds and the endportions of the liner come down more nearly into a horizontal plane, a peak forms as most clearly shown at l2 in Figure 6. The final condition of the liner is shown in Figure 7, where the peak has folded itself down, and all parts of the line end approach a horizontal plane. No portion of the liner extends be yond the cross sectional confines of the carton, and while the liner end may depart to some extent from the horizontal plane, all end portions of the liner are in such a position that the flaps or end closure members of the carton may be folded without any preliminary manipulation of the liner.

I explain the action which occurs in this way:

3 The angular seam ll constitutes a stiffening because of the adhesive juncture of the liner walls to each other, and also because of the interposition of added adhesive where that is used. The angular legs of the seam form a truss. As the two flattened corner portions of the carton move apart, and as the opposite corner portions move toward'eaoh other, the truss tends to resist this movement, until one or the other of the legs of the truss bends or kinks as at H in Figure 5.

- I The liner may be made as at la in Figure 8 with the apex of the angle along the central longitudinal axis ii of the liner. In this event, it Ls unpredictable which of the legsvof the angular seam will bend first. Since in some machines it is desirable to have the peak I: of the liner lie always in one direction, I find that I can accomplish this by moving the apex of the angular seam to one side of the central longitudinal axis I! of the liner. This is illustrated in Figures 1, 2, and 3. It results in a slight cocking of the angle and a greater length in one of the legs of the angle than in the other. In a liner so formed, the longer leg of the angle is eil'ec- -tively the weaker, and will bend first as at H.

Modifications may be made in my invention without departing from the spirit of it. Having thus described my invention in certain exemplary embodiments, what I claim as new and desire to secure by Letters Patent is:

1. A carton having enclosing body walls in .flat tubular form in combination with a flat tubular liner having a' portion projecting beyond the ends of said body walls, said liner adhered to said body walls so as to be erected when the carton is erected, the projecting portion of said liner havlng'a flat end closure seam consisting of' two substantially rectangularly related seams, the outor ends of said closure seam approaching the.

ends of said carton body walls and the apex portion of said seam extending outwardly away from the ends of said walls a sufllcient distance to permit separation of said walls during the erection of the carton without rupturing the liner.

2. A carton having enclosing body walls in flat tubular form in combination with a flat tubular liner having a portion projecting beyond the ends of said body walls, said liner adhered to said body walls so as to be erected when the carton is erected, the projecting portion of said liner having a flat and closure seam consisting of two substantially rectangularly related seams, the outer ends of said closure seam approaching the ends of said carton body walls and the apex porticm of said seam extending outwardly away from the ends of said walls a sufllcient distance to permit separation of said walls during the erection of the carton without rupturing the liner, said seam having an angular formation and formed of straight seam sections intersecting in the central portion of the liner to form an angle.

s. A carton having enclosing body walls in flat tubular form in combination with a flat tubular liner having a portion projecting beyond the ends of said body walls, said liner adhered-"to said body walls so as to be erected when the carton is erected, the projecting portion of said liner having a flat end closure seam consisting of two substantially rectangularly related seams. the outer ends of said closure seam approaching the ends of said carton body walls and the apex portion of said seam extending outwardly away from the ends oi said walls a suflicient distance to permit separation of said walls during the erection of the carton without rupturing the liner. said seam having an angular formation and formed of straight seam sections intersecting in the central portion of the liner to form an angle, said angle being substantially degrees. said carton having body walls of substantially the same width.

4. A carton having enclosing body walls in flat tubular form in combination with a flat tubular liner, saidliner adhered to said body walls so as to be erected when the carton is erected. saidliner having an'end closure seam of nonrectilinear form, the ends of said closure seam approaching the tops of said carton body walls and remaining portions of said seam extending away from the tops of said walls a suflicient distance to permit separation of said walls during the erection of'the carton without rupturing the liner, said seam having an angular formation and formed of straight seam sections intersect ing in the central portion of the liner to form an angle, said angle being substantially 90 degrees, said carton having body walls of substantially 'the same width, the apex of said angle lying to one side of the central longitudinal axis of said liner.

5. A knock-down carton comprising body walls in articulation in flat, tubularform, and a flat, tubular liner therein having a portionprojecting beyond the ends of said body walla-said projecting portion tapering from points at the edges of said ilat liner adjacent the 'ends or said" walls to an intermediate point furthest removed from the ends of said body walls, the edges of said tapered portions being sealed together to form a bottom seam-for said liner, and said liner being adhered to said body walls at least adjacent the ends thereof.

6. A knock-down carton having body walls in articulation in flat, tubular form, and a flat, tubular liner within said walls and adhered thereto at least adjacent the ends of said walls, said" liner having a portion projecting beyond the ends of said body walls and having a bottom seam consisting of two substantially rectangularly related seams meeting beyond said walls, the additive dimensions of a part of said projecting portion being substantially equivalentto the distance between corresponding body walls of the carton when the carton is in erected iorm, whereby said part is pulled substantially into a plane including the ends of said body walls when said carton is erected, accompanied by automatic folding of another part of said liner projecting portion.

JOHN W. WILSON.

ans-muons crrnn The following references are of record in the file of this patent:

UNITED STATES PATENTS Number liame Date 2,999,257 Bergstein Nov. 16, 1937 2,323,505 Wilcox July 6, 1943 2,339,156 Davis Jan. 11, 1944 2,377,533 Waters June 5, 1945 2,381,026 Arthur Aug. '7, 1945

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