A CARRIER BAG

Abstract: A carrier bag (10) comprising two main panels (11, 12) connected together by two sides, one of the two sides including at least one bellows (13), the bag having a top edge (15) defining an opening that is designed to be closed, after the bag (10) has been filled, by sticking together (16) the two superposed main panels (11, 12) close to and along the entire length of the top edge (15). According to the invention, the bag includes at least one pull-open tab (17) for opening the bellows (13) and integrally formed with the bellows (13) to project out from the top edge (15) of the bag (10), the pull-open tab (17) being positioned astride a fold line (13a) of the bellows (13) and being restricted to the folding zone of the bellows (13).

Description: A CARRIER BAG The present invention relates in general manner to the field of packaging, and more particularly to a carrier bag comprising two main panels connected together by two sides, one of said sides including at least one bellows, the bag having a top edge defining an opening that is designed to be closed, after the bag has been filled, by sticking together the two superposed main panels close to and along the entire length of said top edge. A particularly advantageous application of the invention lies in packaging granular foods such as pet food pellets. To close presently-known bags of that type, the superposed panels of said bags are sewn together along their top edges. The main drawback of bags of that type is that they are rather difficult to open. To open them, it is necessary first to pull on a rip cord with which the panels are sewn together, and then to grasp one of the panels to separate it from the other. It is difficult to pull the cord out of the stitching, and doing so takes a certain amount of time. Moreover, once the cord has been removed, it is not easy to grasp one of the two panels at the superposed edges. To make that known type of bag easier to open, a notch has been provided in the top edge of one of the two panels, making it easier to take hold of said panel to separate it from the other. However, the notch does not make it possible to avoid the operation of pulling out the cord with which the panels are sewn together, and this remains a major difficulty in opening the bag. Document EP 580 989 discloses packaging in the form of a bag having a reinforced bottom, in particular for packaging liquid, which bag has a tab projecting from its sealed top edge, the tab extending across the entire width of a bellows and serving to locate a cutting-out zone for opening the bellows. Such a bag can only be opened by being cut and that requires a cutting tool to be used. Finally, document US 27838 discloses packaging having an opening notch that enables a package to be opened by tearing it. To mitigate the drawbacks of the prior art, the present invention proposes a novel carrier bag which is easy to open without damaging the bag. More particularly, the carrier bag of the invention comprises two main panels connected together by two sides, one of said sides including at least one bellows, the bag having a top edge defining an opening that is designed to be closed, after the bag has been filled, by sticking together the two superposed main panels close to and along the entire length of said top edge. The bag includes at least one pull-open tab for opening said bellows and integrally formed with said bellows to project out from said top edge of the bag, said pull-open tab being positioned astride a fold line of the bellows and being restricted to the folding zone of said bellows. Thus, in accordance with the invention, the pull- open tab serves to open the bellows without acting on the main panels of the bag. The bag is thus opened cleanly without being damaged. The tab is advantageously formed during a cutting-out operation that already forms a step in the manufacture of the bag, so no additional manufacturing step is required. The following description which is given with reference to the accompanying drawing by way of non- limiting example makes it easy to understand what the invention consists in and how it can be implemented. Figure 1 is a diagrammatic perspective view of a bag of the invention in the closed state, shown partially cutaway at the bottom. Figure 2 shows the Figure 1 bag in the open state. Figure 3 shows how a tube of paper is cut out for the purpose of making a carrier bag as shown in Figure 1. In Figure 1, there can be seen a carrier bag 10 comprising two main panels 11, 12 that are connected together by two sides. Each of the sides includes a gusset or bellows 13, 14. The carrier bag has a top edge 15 formed by the top edges of the panels 11, 12 and of said bellows 13, 14. The top edge 15 defines an opening that is designed to be closed after the bag has been filled. In this case, the carrier bag 10 is made of paper with the inside walls of the bag having a heat-sealing coating, such as a polyethylene-based covering, for example. Advantageously, the polyethylene-based covering may be provided in the form of a sheet of polyethylene stuck to the inside walls of the bag 10 over a strip of a certain width covering the entire length of the top edge 15 of the bag 10. The bag is then closed at 16 by heat sealing together the panels 11, 12 and the bellows 13, 14 along the entire length of the top edge 15 of said bag. In addition, the bag includes two handles 20, 21 stuck via their ends to respective ones of the two panels 11, 12 so that the handles project outwardly from the top edge 15 of the bag, being centered relative to the sides of the panels 11, 12. The handles 20, 21 may be made of paper or of plastics material. As shown in Figure 1, the carrier bag 10 has a pull- open tab 17 which projects outwardly from the top edge 15 of the bag 10. The pull-open tab 17 is placed astride the fold line 13a of the bellows 13 so that when the bag is in the closed state, with the bellows 13 itself being folded together, the tab 17 is folded in half and is located adjacent to the handles 20, 21. In particular, the pull-open tab 17 is restricted to the fold zone of the bellows 13 and does not extend over the entire width of said bellows. Thus, by pulling on said pull-open tab, the bellows is easily opened with the tab remaining attached thereto once open. Advantageously, said internal sheet of polyethylene is provided with extra adhesive at the pull-open tab 17 and beneath it, thereby making it possible to increase the opening force of said tab. The pull-open tab 17 for opening the bellows 13 is integrally formed with said bellows 13. The tab has a rounded outside edge so that when the bellows 13 is open (see Figure 2), the tab forms a spout. In Figure 1, it can be seen that the bottom of the bag is formed by folding and sticking together the bottom edges of the panels 11, 12 and of the bellows 13, 14. The bottom edge 13b of the bellows 13 that has the pull- open tab 17 includes a cutout 18 that is complementary in shape to the pull-open tab 17 of the bellows 13. This cutout 18 is likewise positioned astride the fold line 13a of the bellows 13 and extends in the same direction as said tab. During manufacture of the bag, the cutout 18 is stuck down on the bottom edges of the folded panels. The method of making such a bag is described below with reference to Figure 3. Initially, a strip of paper which is coated with a heat-sealable covering or with flexible material on a face that is destined to become the inside face of the bag has its two longitudinal edges stuck together so as to form a tube 1 travelling in a longitudinal direction X-X' . Thereafter, the tube of paper 1 is cut transversely so as to form tubular portions la of a length that corresponds approximately to the height of the bag that is to be made. When cutting the tube 1 transversely in order to form a tubular portion la that is detached from the remainder of the tube, a cutout 18 is formed with an appropriate tool so as to leave a notch in cutout edge lb of the detached tubular portion la so that a tab 17 of complementary shape projects from the cut edge lc of the remaining tube 1. In subsequent steps, the cutout portion of tube la which has a tab projecting from one edge and a notch cut out in its opposite edge is folded so as to form the main panels and the bellows of the bag. Folding is performed in such a manner that the tab lies astride one of the folds in one of the bellows, with the corresponding cutout notch likewise lying astride the fold of the same bellows. The bottom of the bag is then formed by folding and sticking together the bottom edges of the panels and of the bellows, one of said edges including the notch cutout 18. The handles are stuck to the edge of the bag that has the tab. Each bag is then ready for filling. After a bag has been filled, the top edge of the bag is sealed, thereby sealing the bellows, with the tab then being folded in half. It should be observed that in the folded state, the pull-open tab has an inside face of paper folded in half with paper touching paper, and an outside face that has the heat-sealable coating or covering. Thus, when the top edge of the bag is sealed there is no danger of sticking the halves of the folded tab together since the heat-seal coating or covering is on the outside face thereof. The superposed main panels of the bag are sealed together by heating a region of said panels situated in the vicinity of the top edge along the entire length of said edge, such that the heat-seal covering that covers the inside faces of the bag is heated, thereby enabling said inside faces to be sealed together. Naturally, the present invention is not limited in any way to the embodiment described and shown, and the person skilled in the art will be able to make variations thereto within the spirit of the invention. In particular, in a different embodiment, the carrier bag of the invention could have a tab projecting from each of the bellows. Also, in a variant of the method, it is possible to envisage having the projecting portion of the cutout on the cutoff edge of the detached portion of tube so that the cutout notch of complementary shape is in the cut edge of the remaining length of tube.

Claims: CLAIMS 1/ A carrier bag (10) comprising two main panels (11, 12) connected together by two sides, one of said two sides including at least one bellows (13), the bag having a top edge (15) defining an opening that is designed to be closed, after the bag (10) has been filled, by sticking together (16) the two superposed main panels (11, 12) close to and along the entire length of said top edge (15), the bag being characterized in that it includes at least one pull-open tab (17) for opening said bellows (13) and integrally formed with said bellows (13) to project out from said top edge (15) of the bag (10), said pull-open tab ( 17 ) being positioned astride a fold line (13a) of the bellows (13) and being restricted to the folding zone of said bellows (13). 2/ A bag according to claim 1, characterized in that said pull-open tab (17) forms a pouring spout when the bellows (13) is opened. 3/ A bag according to claim 1 or 2, characterized in that it includes two bellows (13, 14) respectively interconnecting both sides of said main panels (11, 12), with at least one of the two bellows ( 13 ) being provided with a pull-open tab (17). 4/ A bag according to any one of claims 1 to 3, characterized in that it includes a bottom formed by folding and gluing together the bottom edges of said bag (10), one of the bottom edges including a notch cutout (18) that is complementary in shape to the cutout forming said pull-open tab (17) of a bellows (13), said notch cutout (18) being positioned on said bottom edge in such a manner that prior to the bottom being formed, it is in alignment with said tab (17). 5/ A bag according to any one of claims 1 to 4, characterized in that it includes two handles (20, 21) respectively connected to the two main panels (11, 12) of said bag (10), and in that when the bag (10) is in the closed state, said pull-open tab (17) of the bellows (13) is positioned adjacent to said handles (20, 21). 6/ A carrier bag according to any one of claims 1 to 5, characterized in that it is made of paper. 7/ A carrier bag according to claim 6, characterized in that the inside walls of the bag include a heat-seal coating. 8/ A carrier bag according to claim 7, characterized in that the heat-seal coating is a polyethylene-based covering. 9/ A carrier bag according to claim 8, characterized in that the polyethylene-based covering is in the form of a sheet of polyethylene stuck to the inside walls of the bag (10) at the top edge thereof, extra adhesive for said polyethylene sheet being provided immediately below said pull-open tab (17).

Inventors: LAFFON THIERRY, LAFFON, THIERRY
Applicants: LAFFON THIERRY, UNISABI SA, LAFFON, THIERRY, UNISABI SPECIALITES ALIMENTAIRES POUR ANIMAUX
Application year: 1995
Main classification: B65D75
IPC codes: A45C3, B65D30, B65D33, B65D75, B65D77