US1991450A - Paper bag - Google Patents

Description

Feb. 19, 1935. f c. F. DOBLE 1,991,450 PAPER BAG I Filed Jan. 20, 1952 ZSheets-Sheet 1 W74 lNVENTR F M LAM v ATTORNEY Feb. 19, 1935. c. F. DOBLE 1,991,450

PAPER BAG v Filed Jan. 20, 1932 2 Sheets-Sheet 2.

I Z :fyQJ cw M BY Ga A'ITORREY INVENTOR Patented Feb. 19, 1935 UNITED STATES PATENT OFFICE PAPER BAG Application January 20, 1932, Serial No. 587,732

2 Claims.

This invention relates to a paper bag and method of making the same.

In general, the object of the invention is to produce a superior paper bag having the four a corner portions of the body of the bag constructed to possess suflicient rigidity to impart to the bag the appearance of a rectangular carton.

A further and more specific object of the in,- vention is to provide a lined paper bag having the four corner portions of the body thereof creased to form definite corner beads of suflicient,

rigidity to maintain the bag in rectangular form, thus enhancing the appearance thereof and facilitating the filling, .closing and sealing of the bag.

Another object of the invention is to provide a novel and improved method of making the improved bag.

In the drawings illustrating the preferred embodiment of the invention, Fig. 1 is a perspective of the present bag in an "open condition; Fig.2 is a section taken on the line 22 of Fig. 1; Fig. 3 is an enlarged cross-sectional detail of the sheets'for bag and lining; Fig. 4 is a plan view of the bag-forming sheet from which the present bag may be constructed showing the colored and printed area; Fig. 5 is a similar view of a lining sheet; Fig'. 6 is a diagrammatic plan view illustrating the preferredmethod of making the present bag; and Figs. '7 and 8 are diagrammatic views illustrating the operations of feeding and creasing the bag-forming and lining sheets respectively in the production of the present bag. 4 Prior to the present invention, paper bags have been utilized to some extent in the packaging of of the tendency of the bag material to take ir-p regular shapes, particularly oval or round, thus interfering, with the proper registration of the top of the bag under filling openings and under top-closing devices. The use therefore of paper bags in the packaging industry has heretofore been resorted to chiefly because of savings which have been secured in the bag material as compared with the heavier and more rigid board forming the cartons.

In accordance with the present invention, a paper bag and particularly a lined paper bag may be produced in which the corner portions of the body of the bag are reenforced or rendered sufliciently rigid to impart to the bag a definite and more or less permanent rectangular sectional shape, thereby not only enhancing the appearance of the bag and rendering it of greater commercial value from the sales point of view, but also enabling the bag to be handled by existing package machinery with more facility and with less trouble than has heretofore been possible 10 with the ordinary flexible paper bag. Also the rectangular shape imparted to the bag facilitatesthe packing of filled 'bags in shipping containers.

In accordance with the preferred method of reenforcing or stiffening the corner portionsof the bag, these portions are creased to provide substantial and definite corner beads having considerable rigidity, in fact having a rigidity many times that of the intervening portion of the bag between the corner portions. The bag is preferably lined and the lining is preferably provided with creasing which register with and cooperate with the creased comer beads of the bag, pro viding a structure in which the four corner portions of the body of the bag are relatively rigid as compared with the intervening body portion of the bag and imparting to the baga definite and more or less permanent rectangular sectional shape, both beforebeing filled, during itshandling by packaging machinery in the filing and in the closing of the top of the bag, and also also after the bag has been filled. The bag presents the appearance of a carton, and in many ways possesses thedesirable characteristics of a carton, and in addition enables substantial sav ings to be efiected in the cost of the material going into the package.

For some purposes it may be desirable to provide the. bottom of the bag with definite creas- 40 ings forming beads, depending upon the strength and stiffness of the bag forming material. Accordingly, the invention also contemplates a construction of bag in which the four corner portions of the body of the bag are reenforced pref- 4;) erably by creasing to provide corner-beads, and .also in which, if found desirable, the four corners' of the bottom of the bag may be similarly reenforced to assist in maintaining the bag in a definite and more or less permanent rectangular sectional shape.

Referring now to the drawings, 10 represents a paper bag having the usual bottom flaps 12 thereof folded and sealed in the usual manner to form the bottom of the bag. The paper bag provided with reenforced corner portions 14 having a rigidity or stiffness materially greater than that of the intervening portion 15 of the body of the bag, whereby the bag is caused to assume vwhen in an open condition a rectangular appearance such as is illustrated in Figs. 1 and 2, closely approaching that of an ordinary carton. In the preferred embodiment of the invention, the reenforced corner portions 14 of the body of the bag are formedby creasing the corner portions of the bag to form definite beads, illustrated in Figs. 1 and 2.

In practice, the paper bag 10 is preferably provided with a paper lining 20, and in order to develop most efficient reenforcement at the corner portions of the lined bag, the corner-forming portions of the lining 20 are preferably creased to form beads 22 which cooperate with the beads 14 of the paper bag to provide relatively stiff and rigid corners for the body portion of the lined bag 10.

For some purposes, particularly where the character of paper used'in the production of the paper bag is extremely flexible, it may be desirable to reenforce the edges or corners of the bottom-forming portions of the bag, and for this purpose, I prefer to provide creases along the lines 26 in both the lining and bag material to form reenforcing beads for the edges of the bottom of the bag, thus forming a bag having the marginal portions of the bottom of the bag of sufficient stifiness to materially assist in maintaining the bag in a more or less permanent rectangular sectional shape, both during the filling and handling of the bag and during subsequent use of the bag.

In order to increase the stiffness at the top of the bag and to hold the lining and top of the bag together to prevent materials being dropped between the lining and the outer shell of the bag during the filling operation, it is preferred to adhesively aflix the lining to the inside of the top of the bag by a strip of adhesive indicated in Fig. 1 at 30, and which may in practice comprise a strip approximately one-fourth of an inch in width. It is preferred to use glue as the adhesive, which when hardened provides a stiffening band of rectangular shape around the top of the bag and which cooperates with the rigid corner portions to impart to the bag a substantially permanent shape such as is illustrated in Fig 1, or in other words, in a more or less permanent rectangular sectional shape so that during the filling and handling of the bag the rectangular shaped mouth of the bag may be accurately registered with the filling devices and the bag may be transported with more facility, thus enabling the package machinery to operate upon the .bag with more efliciency than has heretofore been possible. During the closing of the top of the filled bag, the folding operations may be performed upon the relatively stiff mouth of the bag with much more facility and efiiciency to produce more uniformly and accurately folded tops than has heretofore been possible with those bags of the flimsy or extremely flexible tops which when struck by a folding device duringthe folding operation tend to assume irregular shapes and to produce unsightly and irregular folds.

Referring now to Figs. 6, 7 and 8, in accordance with the preferred method of making the present lined bag, the bag forming paper sheets, either plain or having the desired printing thereon are fed from a pile 40 by suitable paper feeding mechanism, not shown, to between a pair of creasing dies 42 by which the bead portions 14, and if desired the lines 26 may be formed in the sheet to produce the beads at corners of the body portion of the bag and along the edges of the bottom of the bag. creased, it is fed into operative position with respect to a forming block 43 about which the sheet is folded, as will be described. The lining paper is preferablydrawn from a roll 50, out 01f by a shear 52 to form the lining sheet 20, and the latter is then fed between a pair of creasing dies 54 which operate to crease the lining sheet to form the beads 22 in the lining, and if desired, beads corresponding to the beads 26 in the paper sheet may also be formed by theoperation of the dies. Thereafter the creased sheet is wrapped about a forming block 56, and during the operation of the machine the forming block 56 with the wrapped lining is presented to a position over the previously fed and creased bagforming sheet and the bag is then wrapped around the forming block with the formed lining thereon, producing the lined bag of the shape shown in Fig. 1. Prior to the wrapping of the bag-forming sheet about the previously 'formed lining, provision is made by any suitable mechanism, not shown, for applying the band of glue to the mouth portion of the lining, so that during the wrapping of the bag forming sheet about the lining on the forming block, the bag becomes adhesively affixed at its mouth portion to the lining. The bottom flaps of both the lining and the bag may be folded and adhesively secured together by any suitable form of folding mechanism, not shown, but which is well-known to those skilled in the art of bag forming machines.

While 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. As a-new article of manufacture, a paper bag composed of ordinary thin flexible paper bag stock, of rectangular shape in section, and having adjacent sides at each 'corner portiorr connected together by a creased rounded corner bead whereby to impart to the otherwise unstable bag suflicient rigidity to enable it to preserve its rectangular shape during filling thereof by automatic machinery.

2. As a new article of manufacture, a lined paper bag composed of ordinary thin flexible paper bag stock and a thin flexible lining therefor, said bag being of rectangular sectional shape and both the otherwise unstable bag and the lining having adjacent sides at each corner connected by creased rounded corner beads whereby to impart sufficient rigidity to the lined bag to enable it to preserve its shape during filling by automatic machinery.

CHARLES F. DOBLE.

After the sheet has been thus

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