US 3240131 A
Description (OCR text may contain errors)
March 15, 1966 K. D. DOBLE, JR
METHOD OF MAKING A LINED CARTON Original Filed Aug. 27, 1962 I N VEN TOR.
ATTORNEY United States latent O 3,240,131 METHOD OF MAKING A LINED CARTQN Kendall D. Dohle, In, Hingham, Mass, assignor to Pneumatic Scale (Iorporation, Limited, Quincy, Mass., a corporation of Massachusetts Original application Aug. 27, 1962, Ser. No. 219,632, now Patent No. 3,182,883, dated May 11, 1965. Divided and this application June 25, 1963, Ser. No. 290,516 2 Claims. (Cl. 93-36.01)
This application is a division of my copending applica-- tion, Serial No. 219,632, filed August 27, 1962, now US. Patent No. 3,182,883, issued May 11, 1965.
This invention relates to a method of making a lined carton.
The invention has for an object to provide a novel and improved method of forming a lined carton characterized by a novel end closure adapted to produce a strong and substantially leakproof lined carton.
A further object of the invention is to provide an improvement in the lined carton and method of making the same as illustrated and described in the United States patent to John G. Vergobbi, No. 2,950,036, dated August 23, 1960.
With these general objects in view and such others as may hereinafter appear, the invention consists in the method of making the lined carton as hereinafter described and particularly defined in the claims at the end of this specification.
In the drawings illustrating the preferred embodiment of the invention:
FIG. 1 is a plan view of a composite carton blank and lining sheet;
FIG. 2 is an end view illustrating a step in the sequence of wrapping the composite blank about a mandrel;
FIG. 3 is a similar view showing the composite blank completely wrapped about the mandrel providing a tubular structure open at both ends; and
FIGS. 4 and 5 are perspective views illustrating the sequence of forming the end closure.
In general the present invention contemplates a novel lined carton adapted to be produced at relatively high speeds on automatic carton forming machines and whose structure is such as to provide a relatively strong, tight and substantially leakproof lined carton. In accordance with one feature of the present invention the present lined carton is formed from a composite blank comprising a prescored carton blank having side and end wall panels and closing flaps, and a lining sheet secured to the carton blank so that in practice the composite blank may be fed directly into the carton forming machine to perform simultaneous forming and folding operations on the carton blank and lining sheet. It will be apparent that such procedure eliminates the requirement of separate feeding and folding apparatus for the lining sheet and the carton blank and is thus conducive to more economical production. In practice it is preferred to arrange the lining sheet in offset relation to the carton blank so that when the composite blank is wrapped about a mandrel or forming block the overlapping portions of each blank and sheet occur in spaced relation to form separate adhesively secured side seams.
In accordance with another feature of the present invention a novel end closure or bottom closure is provided which includes an elongated lining bottom fold wherein opposed side walls of the extended lining are folded inwardly and adhesively secured in overlapping relation, and the opposed end walls of the lining are folded outwardly to provide triangular end tabs coextensive with the bottom of the carton. In the illustrated embodiment of the invention the end closing flaps which are conventionally Patented Mar. 15, 1966 ice coextensive with the end wall panels of the carton are omitted from the end wall panels and are instead formed integrally with one of the side wall panel closing flaps. In practice the side flaps of the carton are folded down into overlapping relation and adhesively secured to each other and to the lining bottom fold, whereupon the end closing flaps formed integrally with the last folded side flap are folded upwardly together with the triangular lining end tabs and adhesively secured against the end wall panels of the carton. This structure of bottom fold in a lined carton provides a relatively strong and tight and substantially leakproof closure in a rapid and efiicient manner. Furthermore, the present bottom closure structure presents a smooth, even and more attractive bottom wall surface free of projections such as were formerly caused by the end flaps and lining tabs folded against the bottom wall. The present bottom closure thus presents a substantially flush surface providing a flat base free of projections by which a filled container may stand on end with less likelihood of tipping over, and also provides uninterrupted end surfaces on which printed matter may 'be more efficiently and attractively applied.
In accordance with another feature of the present invention the lining sheet and the carton blank are preferably secured together by a single relatively narrow line of adhesive disposed in a medial portion of the composite blank longitudinally of and adjacent a marginal edge of a side wall panel. In the formation of the present rectangular lined carton the composite blank is wrapped about a rectangular forming block by first presenting the intermediate side Wall panel, in which said line of adhesive is disposed, against the bottom face of a horizontally extended forming block. Thereafter, the extended portions of the composite blank are folded upwardly against the sides of the block and then inwardly against the top of the block to present the marginal edges of the lining and the marginal edges of the outer blank into overlapping relation. As a result the extended portions of the lining sheet and the carton blank on both sides of the adhesively secured portion which are free of adhesive connections are free to move relative to each other during the folding of the extended portions about the forming block whereby to prevent buckling of the lining sheet during the folding operation. This structure of bottom fold in a lined carton provides a relatively strong and tight and substantially leakproof closure which may be formed in a rapid and efficient manner.
Referring now to the drawings, 10 represents a composite carton blank and liner comprising a fiat prescored carton blank 12 and a liner sheet 15 wherein the carton blank 12 may comprise any of the usual relatively stiff carton board materials and which is provided with side wall panels 14, 16 and end wall panels 18, 20 provided with top and bottom closing flaps. The top closing flaps may comprise the usual side flaps 22, 24 and end flaps 26, 28, each top closing flap being of a height substantially equal to the width of the end wall panels 18, 20 which corresponds to the thickness of the assembled container. The bottom closing flaps include a side flap 30 extended from the side wall panel 14 which may also be equal in height to the thickness of the assembled container. The side flap 30 is also provided with a pair of opposed laterally extended end flaps 34, 36 formed integrally therewith and which may be of intermediate height as illustrated. A second and relatively short side flap 32 extends from the side wall panel 16. The end wall panels 18, 20 are free of closing flaps. As illustrated in FIG. 1, the carton blank 12 is also provided with a relatively narrow marginal sealing panel or flap 38 extended laterally from the end wall panel 18.
In practice the flat prescored carton blank 12 is preferably provided with pressure sensitive adhesive along selected portions of the inner face thereof prior to assembly with the liner, such adhesive being of the type which is non-adhering until pressure activated. As herein shown, the side wall panel 16 is provided with a relatively narrow strip of pressure sensitive adhesive 45) along the marginal edge thereof for overlapping sealing engagement with the outer face of the sealing flap 38 during the formation of the lined carton. The bottom closing flaps, including the side flap 30 and its integral end flaps 34 and 36, are provided with a pressure sensitive adhesive across the entire inner face of the flap as indicated at 44, and the relatively short side flap 32 is likewise provided with a pressure sensitive adhesive across its entire inner face as indicated at 46. The inner face of the side wall panel 14 is preferably provided with a relatively narrow liquid adhesive strip 42 along a longitudinal marginal portion of the panel and spaced laterally a short distance from the score line 43 connecting the panel 14 to the panel 20 as illustrated. The liquid adhesive is applied to the carton blank before superimposing the lining sheet thereover to adhesively secure the lining sheet to the carton blank and serves as the only connection between the blank and the lining sheet to maintain the blank and the sheet in composite relation during the subsequent folding of the composite structure to produce a lined carton.
The carton lining sheet which may comprise any of the usual or preferred relatively thin and flexible lining materials comprises a rectangular sheet which may also be provided .with pressure sensitive adhesive along selected portions of the inner face thereof prior to assembly with the carton blank. As herein shown, the lining is provided with a pressure sensitive strip of adhesive 54 extended longitudinally adjacent the marginal side edge 56 thereof for overlapping sealing engagement with the opposed marginal side edge 58 of the lining during subsequent formation of the lined carton. The lining sheet 15 is provided with a second pressure sensitive adhesive strip 60 extended transversely adjacent a portion of the lower marginal edge thereof for overlapping sealing engagement with an opposed extended lining portion during the subsequent formation of the lining bottom closure.
In the production of the present lined carton the preformed carton blank 12 is first provided with adhesive, as described, and thereafter a rectangular sheet of lining paper, preferably withdrawn from a supply roll thereof is provided with adhesive, severed to length and positioned on top of the carton blank and adhesively secured thereto by the relatively narrow adhesive strip 42 on the carton blank. As illustrated in FIG. 1, the lining sheet 15 is preferably placed on the carton blank in an offset position so that the marginal edge 56 defining one side of the lining sheet is offset inwardly from the adjacent marginal edge 57 of the carton blank, and the opposed marginal edge 58 defining the other side of the lining sheet extends beyond the adjacent marginal edge 59 of the carton blank. The upper marginal edge 62 of the lining sheet may extend above the top closure flaps, as shown, and the lower marginal edge 64 of the sheet may and preferably will be spaced upwardly from the lower marginal edge of the carton blank.
The composite carton blank and liner 10 thus prepared may then be advanced into operative relation to an elongated forming block or mandrel 66 which is rectangular in cross section, and the composite blank is then wrapped about the forming block in the manner indicated in FIGS. 2 and 3 wherein the panel 14 and the associated lining is placed against the wide bottom face of the rectangular forming block 66, and the extended portions of the composite 'blank and liner are folded upwardly to present the end wall panels 18, and the associated lining portions against the narrow side walls of the block. The sealing flap 38 and associated lining portion are then folded against the top face of the block, and the side wall panel 16 and associated lining portion are also folded against the upper face of the block whereby to present the marginal edge 56 of the lining sheet in overlapping relation to the marginal edge 58 thereof, and whereby to present the marginal edge 57 of the carton blank in overlapping relation to the sealing flap 38. Pressure may then be applied along the spaced or offset overlapping portions of the carton blank and liner sheet, respectively, to effect adherence of the overlapped portions by virtue of the pressure sensitive adhesive strips 54 and 40. It will be observed that in folding the extended portions of the composite carton blank and lining sheet about the forming block from both sides of the sealing line 42 the unconnected lining portions are free to move relative to the carton blank so as to prevent cramping or buckling of the lining sheet within the carton blank during the folding operation.
The composite blank and liner thus wrapped about the forming block and secured together along the overlapped marginal edges of the carton and the lining forms a rectangular tubular structure open at both ends. In practice the composite blank is disposed relative to the forming block so that the outer end of the block is aligned with the bottom score line 68 of the carton blank whereby the bottom closing flaps and the adjacent portions of the lining extend beyond the end of the block in position to be folded over the end of the block to form the bottom end closure.
Referring now to FIG. 4, the first step in the formation of the bottom end closure comprises folding of the extended lining portions to form an elongated fold having triangular end portions or tabs 70, 72 as shown in FIG. 4. This may be accomplished by folding the extended narrower end wall portions of the lining outwardly while simultaneously folding the extended wider side Wall portions of the lining inwardly into overlapping relation, the overlapping portions of the liner being then subjected to pressure to secure the same together by virtue of the pressure sensitive adhesive strip 60. Simultaneously therewith, or immediately thereafter, the relatively narrow side flap 32 is folded down and secured to the folded down lining by pressure to set the pressure sensitive adhesive 46.
The next step in the formation of the bottom end closure comprises folding of the wider side flap 30 inwardly on top of the folded down lining and in overlapping relation to the folded down narrow side flap 32 as shown in FIG. 5. Application of pressure against the side flap 30 will effect adherence of the same to the lining and the side flap 32 by virtue of the pressure sensitive adhesive 44. The integral end fiaps 34, 36 are then folded upwardly together with the triangular tabs 70, 72 of the elongated lining fold against the end wall panels 16, 20, respectively, so that in the completed lined carton the end portions 70, 72 of the lining are interleaved between the end wall panels and the end flaps 34, 36, respectively. Application of pressure will set the pressure sensitive adhesive to secure the end flaps 34, 36 in their folded position. The lined carton thus produced may then be stripped from the forming block and transferred to a conveyor for delivery to carton filling and closing mechanism.
From the above description it will be seen that the present lined carton may be economically produced in a rapid and efiicient manner, wherein a preformed composite carton blank and lining sheet may be introduced to the package forming machine, thus eliminating separate feeding stations for the lining sheet and the carton blank. It will also be observed that the novel bottom end closure wherein the extended triangular lining portions 79, 72 are interleaved between the end wall panels and their respective end flaps formed integrally with the last folded side flap provides a strong and substantially leakproof end closure having a substantially flush bottom free of projections. The preapplied adhesive strips described herein as pressure sensitive to'effect adherence may comprise any of the commercially available adhesives including the heat and pressure sensitive type of adhesive.
\Vhile the preferred embodiment of the invention has been herein illustrated and described, it will be understood that the invention may be embodied in other forms within the scope of the following claims.
Having thus described the invention, what is claimed is:
1. The steps in the method of forming a lined carton on a rectangular forming block which consists in adhesively securing a medial portion of a lining sheet to a medial portion only of a prescored carton blank having opposed side and end wall paneis and having two opposed bottom closure side fiaps wherein one of said side flaps is provided with two opposed end closure flaps formed integrally therewith, said end wall panels being free of bottom closure flaps and said lining sheet including wall portions at the bottom thereof that at least partially overlie said end closure flaps, the remainder of the sheet on both sides of said medially secured portion being free of the carton blank, then Wrapping the composite blank about the forming block starting by presenting said medial portion against one face of the block and progressively folding adjacent adhesive-free portions of the composite blank on both sides of said medial portion against successive adjacent faces of the block to present the op posed and unsecured marginal edges in overlapping rela tion, the unsecured portions of the lining sheet being free to move lengthwise relative to the carton blank during the wrapping operation, adhesively sealing said overlapping portions to provide a tubular structure, forming a lining bottom closure from said overlying bottom lining portions having laterally extended triangular tabs while supported on the block, said tabs being substantially smaller in area than said end closure flaps, folding the bottom closure side flaps into overlapping relation and adhesively securing the same and to present the integral end flaps parallel to and in contiguous engagement with said laterally extended triangular tabs, and then folding the opposed integral end flaps together with said triangular end tabs against opposed end wall panels and adhesively securing the same whereby to provide a smooth and uninterrupted surface on the bottom of the carton free of underlying end closure flaps and triangular lining tabs.
2. The steps in the method of forming a lined carton on a rectangular forming block which consists in adhesively securing a lining sheet to a prescored lining blank having opposed side and end wall panels and having two opposed bottom closure side flaps wherein one of the side wall bottom flaps is relatively short in length and the other side wall bottom flap is of a width equal to the thickness of the carton is provided with two opposed end closure flaps formed integrally therewith, said end wall panels being free of bottom closure flaps and said lining including wall portions at the bottom thereof that at least partially overlie said end closure flaps, Wrapping the composite blank about the forming block to present the opposed marginal edges thereof in overlapping marginal edge relation, adhesively securing said overlapping portions to provide a tubular structure, folding inwardly two opposed side Wall portions at the bottom of the lining and their adjacent bottom closing side flaps and adhesively securing the same, said bottom closing operation providing laterally extended triangular lining end tab portions which are substantially smaller in area than said end closure flaps and presenting the integral end closure flaps parallel to and in contiguous engagement with said triangular end tabs, and then folding said opposed end flaps together with said triangular end tabs against the adjacent end wall panels and adhesively securing the same whereby to provide a smooth and uninterrupted bottom closure free of underlying end closure portions.
References Cited by the Examiner UNITED STATES PATENTS 2,776,607 1/1957 Fischer et al 9336.6 2,950,036 8/1960 Vergobbi 9336.1 X 2,983,421 5/1961 Turpin 229l4 X FRANK E. BAILEY, Primary Examiner.
BERNARD STICKNEY, Examiner.