JPS5927385Y2 - bag that can be opened and closed - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement in a bag that can be opened and closed by attaching a belt-like zipper having concave and convex portions that can be freely engaged and detached from each other at the opening of the bag.

Bags with a zipper of this type have been commonly used in various packaging bags in order to facilitate opening and closing operations, but in all cases the zipper is integrally molded into the bag opening of the bag body.

Therefore, in bags with zippers that are entirely made of synthetic resin film with excellent flexibility in order to make it easier to insert items into the package, it is difficult to obtain a sufficient level of engagement between the zippers and the recesses, and the opening of the bag opens naturally. On the other hand, bags with zippers, which are made entirely of synthetic resin film with excellent hardness and strength to ensure the uneven engagement of the zipper, lack the flexibility of the main body and are prone to tearing. However, there were drawbacks such as the fact that it was easy to use and it was a little difficult to insert the items to be packaged.

This idea makes it possible to use a synthetic resin film with excellent flexibility as the film material for the packaging body to make it easier to insert the packaged items, while the zipper is made of hardness and strength to ensure uneven engagement. So that it can be constructed with superior materials,
The purpose of this project is to provide an openable and closable bag that can also have a zipper made of a material different from the film material of the packaging body, and which can be integrally attached to the packaging body. A bag mouth edge 11 on the bag mouth part 6 side of the packaging body 1 which is configured and has a bag mouth part 6
A zipper tape 8 having a convex portion 9 is attached to the bag edge 11 on the other side, and a zipper tape 8 having a concave portion 10 which can be freely engaged with and detached from the convex portion 9 is attached to the bag edge 11 on the other side in the width direction of the bag to form a bag that can be opened and closed. The fastener tapes 8, 8 are made of a different resin material from the film material that does not weld to each other,
Either the inner or outer side of the zipper tape 8 and the bag edge 11 is provided with the bag edge 11 itself or a heat-fusible film 1 separate therefrom.
2. At the same time, the bag itself is attached to either the inside or outside of the zipper tape 8 and the bag mouth edge 11, and is separate from the film material and mutually compatible with the adhered film. A heat-fusible film 12 made of the same material and capable of heat-sealing is attached to the film, and the adhered film and the heat-fusible film are fused together by opening the zipper tape 8 (heat-sealing via L13). The point is that it is intimidating.

Here, the fusion hole that opens in the fastener tape is
As will be made clear in the description of the examples below, there are cases in which the fusion holes are opened in the fastener tape at the same time as the tape is heat-sealed, and fusion holes that are opened in the fastener tape in advance before heat-sealing. shall include both meanings in the case of

Hereinafter, embodiments of this invention will be described based on the drawings.

1 to 3, reference numeral 1 denotes a packaging body, which is made by folding a thermally cuttable film material, such as vinylon film with excellent flexibility, through a gusset 2, and attaching the folded part with the gusset 2 to the bottom of the bag. 3, and by heat-sealing both sides 4 and 5, an open bag opening 6 is formed at the top.
is configured to form a

Reference numeral 7 denotes a belt-shaped fastener, which is made of a pair of narrow fastener tapes 8, 8 made of a resin material different from the film material of the main body 1, for example, polyethylene, which has superior hardness and strength compared to vinylon, which is the film material. The fastener tape 8 on one side has a convex part 9 with a mushroom-shaped cross section continuously integrally molded over the tape's longitudinal direction, while the fastener tape 8 on the other side has an arc-shaped convex part 9 that can be freely engaged with and detached from the convex part 9. The concave portion 10 in the cross section is integrally molded continuously over the longitudinal direction of the tape.

This belt-shaped fastener 7 is integrally attached to the bag opening 6 of the main body 1 by heat-sealing means, but when attaching it, the lower half of the outer surface of the fastener tape 8 on one side is attached to the bag opening 6. attached to the inner surface of the side bag opening rim 11 in the bag width direction, and on the inner surface of the tape 8 and the outer surface of the bag opening rim 11, respectively.
A narrow heat-fusible film 12.12 made of the same material, for example, polypropylene, is attached to both, and the thus polymerized zipper tape 8, bag edge 11, and inner and outer heat-fusible films 12.12 are attached. By inserting a thermal welding blade (not shown) through the bag at intervals in the bag width direction to form a row of fusing holes 13, the inner and outer heat-fusible films 12 and 12 are connected to the zipper tape 8 and the bag opening. The inner periphery of the hole 13 in the edge 11 is fused, and the fastener tape 8 is integrally attached to the bag edge 11 via the fused portion 13a.

The zipper tape 8 on the other side is also the bag opening edge 1 on the other side of the bag opening 6.
In this case as well, the fastener tape 8 is attached integrally to the inner surface of the tape 1 by heat-sealing means in the same manner as in the case of the first embodiment.

The zipper tapes 8, 8 are attached in advance to the edge of the film that is the raw material of the packaging body 1 (the edge that will become the bag mouth edge 11) using the heat-sealing means in the pre-bag making process of the packaging body 1. At the same time, both sides 4 and 5 of the main body 1 are thermally welded and sealed during the bag making process of the rear packing main body 1, and at the same time both longitudinal ends 8a and 8b of the fastener tape 7 are attached to both sides 4 and 5. They are fused together.

In the above embodiment, the zipper tapes 8, 8 are attached to the bag opening edge 11.
As shown in FIG. 4, the tape 8.8 has a heat-sealable film 12.8 on each outer surface of the bag edges 11, 11 as described above. Alternatively, when the heat-fusible film 12 is made of the same material as the film material of the mounting body 1, it may be attached integrally with a heat-sealing means using the heat-sealable film 12 as shown in FIG. 5 or FIG. As shown in FIG. Even if heat-fusion cutting blades (not shown) are inserted into the edge 11 at intervals in the bag width direction and the fusing holes 13 are arranged in a row, the heat-fusible film 12 and the bag edge 11 are not connected to the zipper tape 8. The inner periphery of the hole 13 becomes fused, and the zipper tape 8 can be integrally attached to the bag edge 11 via the fused portion 13a in the same manner as described above. It can contribute to savings.

Furthermore, as shown in another embodiment in FIG. 7, the fastener tape 8 of the belt-shaped fastener 7 has a row of welding holes 13 formed in advance by melt cutting or mechanical punching, and the inside and outside of the holes 13 are both inserted. The heat-fusible film 12 made of the same material and the bag edge 11 are bonded together, and the film 12 and the bag edge 11 are bonded together.
The fastener tape 8 can also be integrally attached to the bag opening rim 11 made of a different material by heat-sealing the two in the hole 13.

In this way, the heat-fusible films 12 and 12 made of the same material attached to the inside and outside of the fastener tape 8, or the film 12 and the bag edge 11 made of the same material are connected to the fusion holes 413 of the fastener tape 8. Since the fastener tape 8 is made of a material different from the film material of the main body 1, the fastener 7 is integrally attached to the main body 1, and therefore the material of the fastener tape 8 is - A resin material with excellent hardness and strength such as bot ethylene can be used to ensure the engagement of the concave portion 10 and the convex portion 9. The fastener tape 8 can be made of a material different from the above-mentioned material, such as vinylon film, etc., which is highly flexible and adaptable to the above-mentioned materials.

8 and 9 show still another embodiment of this invention. In the above embodiment, the upper half of the zipper tape 8 extends above the bag opening edge 11, and only the lower half is attached to the bag opening. In contrast to the case where the zipper tape 8 is integrally attached to the edge 11, in this embodiment, the entire outer surface of the zipper tape 8 is attached to the bag edge 11 in order to attach both the upper part and the lower half of the zipper tape 8 integrally to the bag edge 11. A heat-fusible film 12 made of the same material is attached to the inner surface of the mouth rim 11, and to the top and bottom of the inner surface of the tape 8, and to the outer surface of the bag mouth rim 11. The fusing holes 13 are made by inserting thermal fusing blades (not shown) at intervals in the bag width direction over the upper and lower layers of the inner and outer heat-fusible films 12, 12, the bag edge 11, and the zipper tape 8. They are arranged in two stages, upper and lower, and the inner and outer heat-fusible films 12 and 12 are fused together at the inner peripheral edge of each welding hole 13.

According to this embodiment, the fused portions 13 a of the heat-fusible films 12 and 12 in the fused holes 13 are arranged in two rows, upper and lower, so that the fastener tape 8 is attached to the bag edge 11. In addition, multiple layers of zipper tape 8 and heat-adhesive film 12 are polymerized and integrated on the inside and outside of the bag opening rim 11, making the bag opening 6 more sturdy.
In addition, even if the fastener tape 8 is made of a resin material different from that of the main body 1, the effect that it can be integrally attached to the main body 1 can be obtained in the same manner as in the above embodiment. can.

In this embodiment as well, the fastener tape 8 is
It is possible to attach the heat-fusible film 12 to the outer surface of the bag rim 11 as shown in the illustrated example, and if the heat-fusible film 12 is made of the same material as the packaging body 1, it can be attached to the outer surface of the bag rim 11 as shown in the fifth and sixth illustrated examples. Similar to the above embodiment, the adhesive film 12 only needs to be attached to one side of the fastener tape 8 opposite to the side that contacts the bag opening edge 11.

In addition to the above-mentioned structure, the band-shaped fastener 7 has a structure in which the fastener tape 8 on one side is densely formed with a group of recesses made of small loop-shaped pieces, and the fastener tape 8 on the other side has a protrusion of hooks or mushroom-shaped pieces that can be freely engaged with and detached from the recesses. The present invention can be similarly applied to fasteners with densely packed parts.

As described above, according to this invention, the fastener tapes 8, 8, which are made of a different material from that of the packaging body 1, are attached to the bag opening portion of the packaging body 1.
Since it can be integrally attached to the packaging body 1 and the fastener tape 8, the material selection for the packaging body 1 and the fastener tape 8 can be freely selected.The film material for the packaging body 1 is a thermally welded material with excellent flexibility that makes it easy to store the packaged items. This makes it possible to use a hard and strong resin material that increases the engagement force between the uneven parts 10 and 9 as the material for the fastener tape 8, and prevents unexpected damage to the bag opening 6. There are advantages in that it is possible to obtain a zippered openable bag that does not open and that makes it easy to store items to be packaged, and also enables mass production.

[Brief explanation of drawings]

Fig. 1 is a front view showing an embodiment of the openable bag according to this invention, Fig. 2 is an enlarged sectional view taken along the line II-II in Fig. 1, Fig. 3 is an enlarged sectional view of the main part, and Figs. 7 is a sectional view showing another modified embodiment, FIG. 8 is a front view showing still another embodiment, and FIG. 9 is an enlarged sectional view taken along the line in FIG. 8. 6... Bag opening part, 1... Packing body, 10.
...Concavity, 9...Protrusion, 7...
Zipper, 8...Zipper tape, 13.
... Fusion hole, 12 ... Heat-sealing film, 11 ... Bag mouth rim.

Claims (1)

[Claims for Utility Model Registration] A fastener tape 8 having a convex portion 9 on the bag mouth edge 11 on the side of the bag mouth portion 6 of a packaging body 1 which is made of a heat-meltable film material and has a bag mouth portion 6. In a bag that can be opened and closed, in which a zipper tape 8 having a concave portion 10 that can be freely engaged with and detached from the convex portion 9 is attached to the edge 11 of the bag on the other side in the bag width direction: The zipper tapes 8, 8 are The film material is made of a different resin material that does not weld to each other; on either the inside or outside of the zipper tape 8 and bag mouth edge 11, either the bag mouth edge 11 itself or a heat-fusible film 12 separate therefrom is attached. A material that is different from the film material and is mutually the same as the film material is used to attach an adhered film selected from the above, and to attach the bag itself to either the inside or outside of the zipper tape 8 and the bag mouth edge 11. A heat-fusible film 12 that can be heat-sealed is attached, and the adhered film and the heat-fusible film are heat-sealed to each other through the fusing holes 13 opened in the fastener tape 8. A bag that can be opened and closed freely.