US3214080A - Self-mounting litter bag and method of manufacture - Google Patents

Description

Oct. 26, 1965 w. B. WOLFSON SELF-MOUNTING LITTER BAG AND METHOD OF MANUFACTURE 2 Sheets-Sheet 1 Filed May 3, 1963 Inveniofl: B. WbZfiSon,

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SELF-MOUNTING LITTER BAG AND METHOD OF MANUFACTURE Filed May 3, 1963 2 Sheets-Sheet 2 United States Patent SELF-MOUNTING LITTER BAG AND METHOD OF MANUFACTURE William B. Wolfson, West Newton, Mass., assiguor to Republic Foil, Inc., doing business as Consolidated Bag & Foil Division, Somerville, Mass., a corporation of Delaware 1 Filed May 3, 1963, Ser. No. 277,764 Claims. (Cl. 229--53) This invention relates to the manufacture of litter bags and similar paper or paperboard receptacles for general use, and pertains more particularly to improvements in disposable litter bags provided with an exposable area of pressure-sensitive adhesive, whereby the bag may be removably mounted on a convenient supporting surface, such as the panel of a motor vehicle, the frame or post of a bed or chair, or the wall of a room.

I am aware that adhesively mountable litter bags have heretofore been provided for similar purposes, but those known to me have required the use of separate, doublecoated, pressure-sensitive tapes or labels, protected by peelable cover strips, or the use of a separate, peelable, protective strip or sheet normally covering a patch of pressure-sensitive adhesive on the bag. In such prior bags,

a special type of releasable paper or cloth must be ap-' plied to the bag and discarded after removal, and serious problems arise in supplying such tapes or release papers to the bag during its economic and efficient formation in the usual bag making machines.

invention to produce a disposable litter bag of such construction that the use of a separate protective strip is obviated, and to provide a method of manufacture which involves the application of a strip of pressure-sensitive adhesive, as well as a continuous strip of the usual watersoluble adhesive, if used, to the paper web entering the standard bag forming machine, and the application to said web of a marginal coating of a release agent which preferably underlies a subsequently applied pressuresensitive strip.

In accordance with the improved method of manufacture, both of the adhesive strips serve to seal one marginal area of the formed bag to another underlying marard bag making machine, with minor modifications in its 1 operating mechanisms. The bag may be lined, if desired, and as herein suggested, by a layer of metal foil, to afford increased protection and sanitation when wet substances or articles are deposited therein for disposal; and it will be apparent that the bag may be a paper or paperboard receptacle of various sizes and shapes.

Additional advantages resulting from the use and practice of this invention will become evident from the following description of the recommended embodiments illustrated by the accompanying drawings, but it will be understood that the structural details of the litter bag herein shown and described may be varied to suit particular purposes or conditions without departing from the essence of the invention as set forth in the appended claims. In the drawings:

FIG. 1 is a fragmentary plan view of a paper sheet or web marginally coated preparatory to forming a bag in a bag making machine;

; It is accordingly the principal purpose of the present FIG. 2 is an enlarged fragmentary view of a sectional portion of the web of FIG. 1, provided with a foil lining spaced from the coated margin thereof;

FIG. 3 is an elevation, partly broken away, of a litter bag produced by the bag making machine from the lined web of FIG. 2;

FIG. 4 is a view similar to FIG. 3, showing one mode of exposing a pressure-sensitive adhesive area;

FIG. 5 is a view similar to FIG. 4 showing a second mode of exposing such adhesive area; and

FIG. 6 is a similar view illustrating a third optional mode of exposing such adhesive area.

The litter bag chosen for the purpose of illustration in FIGS. 3 to 6 of the drawings is of the gusseted type customarily produced in a standard bag making machine which applies a glue stripe longitudinally of a continuously fed paper web, folds the web into a sealed, flattened tube, applies transverse glue stripes to the exterior of the tube at spaced intervals, cuts the tube transversely into individual bag sections adjacent the respective transverse glue stripes, and then folds and seals an end margin of each section to close the bottom of the finished bag. A bag thus made in a variety of sizes is conveniently used as a receptacle for various commercial products sold in stores and markets, and for other well known purposes.

In accordance with the preferred practice of this invention, the paper web 11 of FIG. 1 has the ordinary glue stripe 12 of aqueous adhesive applied a substantial distance from one longitudinal edge of the web; a relatively wide longitudinal band 13 of a release agent, such as silicone, is applied to that marginal edge of the web in parallel spaced relation to the glue stripe 12; and a relatively narrow longitudinal stripe 14 of a suitable pressure-sensitive adhesive is applied over the silicone coated band 13. The silicone coating is preferably applied first, before the web reaches the bag forming mechanisms of the machine. The adhesive coatings 12 and 14 may then be applied, simultaneously or successively.

The web of FIG. 2 includes an optional lining layer' 15 of metal foil which is preferably laminated to the paper sheet 11 at the time the silicone coating 13 is applied. The foil lining is spaced from the glue stripe 12 and extends, as shown, to the opposite longitudinal edge of the laminated web.

In FIG. 1, the broken lines diagrammatically indicate the approximate positions at which the individual bag sections of the tubed web are transversely severed from the web, as aforesaid. The bracketed areas 16 and 17 of FIG. 2 indicate the approximate width of the partially overlapping-marginal flaps which close the front face of the gusseted bag of FIG. 3, and which are also designated 16 and '17, respectively. The mutual overlap of the underlying flap 17 and the adhesive-coated overlying flap 16 is wider than usual in a bag of this type, due to the combined width of the silicone coated marginal band 13 (with its overcoated strip of pressure-sensitive adhesive 14) and the inwardly spaced, parallel stripe 12 of aqueous adhesive, on the underside of the overlying flap 16.

In the completed litter bag shown in FIGS. 3 to 6, the overlapped flaps 16 and 17 are thus adhesively sealed by the relatively wide strip 14 of pressure-sensitive adhesive and by the relatively narrow strip 12 of water-soluble glue. However, as the strip 14 is spaced from the extreme marginal edge 18 of the overlying flap, that unsealed edge is free to be grasped and lifted to expose a selected area of the pressure-sensitive adhesive. The coating 13 of silicone or other release agent permits the margin of flap 16 to be peeled from the pressure-sensitive adhesive which transfers and firmly adheres to the uncoated paper surface of underlying flap 17, as indicated at 19 in FIGS. 4 to 6; but the two flaps remain sealed by the glue stripe 12.

It will be apparent, however, that the glue stripe 12 may be omitted, if desirable, for some purposes, and that the strip of pressure-sensitive adhesive, widened if necessary to extend beyond the inner edge of the silicone band 13, may serve as the only means for sealing the overlapped flaps. In such optional arrangement, the margin of flap 16 would not be peeled completely away from the adhesive seal.

It is apparent that the pressure-sensitive adhesive strip 14 may be applied to the web margin which constitutes the underlying ba-g flap 17, instead of being superposed on the adhesive-releasing coating 13 of the web margin which constitutes the overlying flap 16 (as previously explained), so long as said adhesive strip and said coating are in contact between the superposed flaps when the bag is completed.

The margin of the overlying flap of the finished bag may be marked or scored in various optional manners to serve as a guide to the user in peeling back, and removing, if desired, a portion of that margin to expose a selected area of the pressure-sensitive adhesive, so that the exposed area may be pressed against a supporting surface for mounting the litter bag in a position convenient to the user.

In FIG. 3, for example, a diagonal line 20 may be printed or scored on the margin of flap 16 to indicate that a triangular tab 21 may be peeled back, as shown in FIG. 4. In FIG. 5, a line 22, parallel to the edge of the flap guides the peeling and tearing back of a rectangular tab 23. In FIG. 6, a scored line 24 extends parallel to the edge of the flap from the open top of the bag to the folded and sealed bottom margin 25 thereof, so that a marginal strip 26 of flap 16 may be peeled downwardly as far as desired, and readily torn off, if preferred.

Indeed, in any of these examples, the peeled marginal tab or strip may be torn away, for it is contemplated that the litter bag will be adhesively mounted by the exposed patch 19 until the bag and its contents are to be discarded as refuse. To facilitate removal of the tabs 21 or 23, the guide lines 20 and 22, respectively, may be scored or otherwise weakened, as suggested above; and it will be appreciated that the guide or scored lines may be located at any selected position on the peelable marginvof the 4 cated by the broken lines in FIG. 1. With such intermittent application, a modified bag having an exposable pressure-sensitive patch of limited length located, for example, at the top of the bag, as indicated in FIG. 3, would be produced by the optional procedure.

It will also be understood, as aforesaid, that a receptacle produced as herein disclosed may be used for purposes other than litter or refuse, and that the receptacle may be made in a variety of shapes and sizes and of paperboard and other suitable materials, as well as of plain or laminated paper. The term litter bag as used in this description of the invention, and in the following claims, is accordingly intended to comprise equivalent receptacles or containers for a variety of purposes.

I claim:

1. A litter bag comprising a sheet of flexible material having opposed overlapping marginal flaps adhesively bonded at one side of the bag, the marginal portion of the overlying flap having a coating of adhesive-release agent extending to and parallel with the edge of the underside of said marginal portion, and a bonding strip of pressuresensitive adhesive extending longitudinally of said marginal portion between said overlapped flaps, in contact with said coating and in spaced parallel relation to said edge, whereby a part of said marginal portion may be peeled away from the underlying flap to expose a bagmounting area of pressure-sensitive adhesive.

2. A litter bag as described in claim 1, the inner longitudinal edge of said strip being spaced from the inner longitudinal edge of said coating, and a longitudinal stripe of aqueous adhesive disposed in spaced parallel relation to said coating and providing a permanent bond between the overlapped areas, from the top of the bag to the bottom thereof.

3. A litter bag as described in claim 1, said coating and said bonding strip extending longitudinally of said marginal portion from the top of the bag to the bottom thereof.

4. A litter bag as described in claim 1, said overlying flap having guide lines indicating the area to be exposed by peeling away such flap part.

5. A litter bag as described in claim 1, said overlying flap having a weakened line extending from the top of the bag in spaced parallel relation to said flap edge to a point near the bottom of the bag, whereby the marginal portion disposed outwardly of said line may be peeled downwardly from the bag top along said line.

References Cited by the Examiner UNITED STATES PATENTS 2,737,860 3/56 Randall 93-35 2,861,735 11/58 Faltin 229,-53 2,894,675 7/59 Stein 2295 3 3,110,231 11/63 Stein 93-35 FRANKLIN T. GARRETT, Primary Examiner.

Claims (1)

1. A LITTER BAG COMPRISING A SHEET OF FLEXIBLE MATERIAL HAVING OPPOSED OVERLAPPING MARGINAL FLAPS ADHESIVELY BONDED AT ONE SIDE OF THE BAG, THE MARGINAL PORTION OF THE OVERLYING FLAP HAVING A COATING OF ADHESIVE-RELEASE AGENT EXTENDING TO AND PARALLEL WITH THE EDGE OF THE UNDERSIDE OF SAID MARGINAL PORTION, AND A BONDING STRIP OF PRESSURESENSITIVE ADHESIVE EXTENDING LONGITUDINALLY OF SAID MARGINAL PORTION BETWEEN SAID OVERLAPPED FLAPS, IN CONTACT WITH SAID COATING AND IN SPACED PARALLEL RELATION TO SAID EDGE, WHEREBY A PART OF SAID MARGINAL PORTION MAY BE PEELED AWAY FROM THE UNDERLYING FLAP TO EXPOSE A BAGMOUNTING AREA OF PRESSURE-SENSITIVE ADHESIVE.

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