JP2002019796A - Easy-open bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bag in which an over-tape is less peeled off but sufficiently adhered thereto, and the over-tape can be neatly and easily unsealed. SOLUTION: One opening part of a bag body 1 is set to be longer than the transverse width of the bag body, a heat-sealant 2d is coated on an inner surface, hot melt adhesives 3a and 3b are provided in a linear manner in the transverse direction at locations forming forward and rear sides in a double- folded condition, a cut tape 4 formed of the synthetic resin such as biaxially oriented polypropylene is adhere to the front side, slits 5a and 5b holding the cut tape are formed in one end of the over-tape, the over-tape 2 with a picking piece 6 formed therein is double-folded and packaged in the forward and rear sides, and the end of the bag body is closed by heating and melting the heat- sealant and the hot-melt adhesive.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an easy-open bag suitable for storing pet food.

[0002]

2. Description of the Related Art A conventional bag for pet foods and the like has one opening portion of the bag body covered with an overtape which is folded and bonded in two. Polypropylene is laminated on the surface of the bag body, and a heat sealing agent is coated or laminated on the adhesive surface of the overtape, and the overtape is attached to the bag body by heat sealing.

However, the adhesive strength of the overtape by heat sealing is not sufficient, and the overtape is partially peeled off from the bag body due to a change in environmental temperature, and the pet food inside leaks from the peeled portion, or There are drawbacks such as small insects invading from the detached part, which is a main cause of the claims.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a bag in which the overtape is sufficiently adhered and there is little fear of peeling off, and the overtape can be opened easily and easily.

[0005]

In order to achieve the above object, a bag according to the present invention has a configuration in which one opening of the bag body is longer than the width of the bag body, a heat sealing agent is applied to the inner surface, and the bag is folded in two. A hot-melt adhesive is provided in a line in the lateral direction on each of the front side and the rear side, and a synthetic resin cutting tape such as biaxially stretched polypropylene is attached to the front side, and one end of the overtape. In the front of the back and the back side, wrap the overtape with a slit that cuts the tape for cutting into a slit and wrap it in two, and fuse it with a heat sealant and hot melt adhesive by heating. And the tab of the cutting tape is separated from the rear side of the overtape.

In the case of a bag whose outer surface has been subjected to a synthetic resin film treatment, the surface of one open end of the bag body is roughened, and the overtape is thermally fused to the roughened surface. In addition, the overtape is formed by sequentially forming a polyethylene layer, an oil-resistant paper, and a heat sealant layer on the inner surface of an outer tape made of paper.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A bag according to the present invention will be described below with reference to a manufacturing process. In FIG. 1, one end of the bag body 1, and in FIG. The bag body 1 is composed of, for example, a three-layer bag of an outer bag 1a made of paper laminated with polypropylene, a middle bag 1b made of polyethylene, and an inner bag 1c made of paper (kraft paper).

The overtape 2 is slightly longer than the width of the bag body 1, and as shown in FIG. 4 (a), an outer layer tape 2a made of paper is provided with a polyethylene layer 2b on the inner surface and an oil-resistant paper 2c on the inner surface. Heat sealant 2 on the inner surface (innermost surface)
d, and the hot melt adhesives 3a, 3b near the front edge (lower edge in the figure) and near the rear edge (upper edge in the figure) as shown in FIG. 3b is provided in parallel with each edge.

Here, for example, an ethylene-vinyl acetate copolymer-based heat sealant is used.

As shown in FIG. 1C, a cutting tape 4 made of a synthetic resin such as biaxially-stretched polypropylene is adhered to the front side of the overtape 2. Further, a slit 6 is formed in one end of the front side of the overtape by inserting slits 5a and 5b for sandwiching the cutting tape as shown in FIG. As shown in FIG. 4E, a peel-off portion 7 of the heat sealant is provided on the rear side of the portion of the overtape 2 which is symmetrical with the knob 6 at the folding line portion LL for folding in two. Form.

[0011] The overtape 2 is folded in two at the front side and the rear side at the fold line LL, and the one end (the lower side in the figure) of the bag body is wrapped, and the hot melt adhesive is heated. Then, the bag is fused with a heat sealant to close the end of the bag body. At this time, the closing strength can be further increased by bending the end portion of the bag body once as shown by reference numeral 8.

A synthetic resin film, for example, a polypropylene film 9 is laminated on the surface of the outer layer bag in the bag body, but the polypropylene makes the adhesive less likely to adhere. Therefore, in the present invention, the polypropylene on the end surface of the portion of the bag body where the overtape is to be fused is heat-fused to form a rough surface of the polypropylene as shown by reference numeral 10 in FIG. 5B.

In order to form the rough surface portion 10 of polypropylene, the polypropylene is heated by sliding the ends of the bag body between the heated upper and lower metal plates (for example, iron plates) by sliding the metal plate. It is formed by melting with a metal plate.

Next, the end 8 of the bag body is bent once as shown in FIG. 3C, and the overtape 2 is bent as shown in FIG.
Wrap the end of the bag body and close the end by heat fusion. At this time, the front side and the rear side of the portion of the over tape that protrudes from the bag body to the left and right are adhered to each other, but one of the knobs 6 is separated from the rear side by the peeling portion 7 of the heat sealant. Has been dissociated.

[0015]

[Action and Effect] The bag manufactured in the above-described process is filled with, for example, a pet food from the upper opening,
After filling, the upper opening is closed by an appropriate means, for example, the opening is bent, and the tape 11 is stuck on the tape as shown in FIG. . The usage state of the bag filled with the pet food is upside down from FIG.

In the present invention, not only the overtape 2 is heat-sealed at one opening of the bag body with a heat sealant but also the overtape is fused to the bag body with a hot melt adhesive. Since the melt has a wider heat-resistant temperature range than the heat sealant, the overtape is unlikely to be peeled off even when the environmental temperature changes during transportation or storage.

Further, in the present invention, since the overtape is fused to a rough end of the synthetic resin film in the bag body, the heat sealing agent of the overtape and the hot melt adhesive are adhered to the bag body. The strength is further increased, and peeling of the overtape can be further prevented.

Therefore, it is possible to prevent the filling material from leaking from the peeling portion of the overtape, or to prevent moisture from entering from the peeling portion to solidify the filling material and to prevent small insects from entering.

Further, since the overtape 2 is provided with a polyethylene layer and an oil-resistant paper on a paper outer layer tape, it is excellent in moisture-proof, water-proof and strength, and does not have a possibility of being broken by moisture or wetness. The opening can be safely closed. Further, since the oil-resistant paper is interposed, the oil content in the contents such as the pet food does not seep out from the overtape, and the overtape can be prevented from being stained with oil.

To remove the filling material, for example, pet food, the bag is opened by tearing the over tape 2 at the top, and the bag of the present invention can easily open the over tape.

That is, by pulling the knob 6 at one end of the cutting tape as shown in FIG. 7, the overtape 2 can be easily torn with the tape. In addition, since the knob 6 is not bonded at the peeling portion 7 of the heat sealing agent, the knob 6 can be easily extracted and the overtape can be cut off efficiently.

It is possible to increase the fusion strength of the overtape to the bag body by corona discharge treatment. However, in the case of corona discharge, it is technically necessary to apply treatment to the entire surface of the bag. There is a disadvantage that the surface becomes slippery and the load easily collapses when placed in a stack.

In the present invention, however, the synthetic resin film is removed by heat melting only at the portion of the bag where the overtape is to be fused instead of the entire surface of the bag, and the overtape is fused. The surface is not slippery, and there is no danger of collapse when stacked.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a bag according to the present invention.

FIG. 2 is an enlarged perspective view of a main part showing an embodiment of a bag according to the present invention.

FIG. 3 is an enlarged perspective view showing a main part of the bag according to the embodiment of the present invention in a longitudinal section.

FIG. 4 is a plan view showing a manufacturing process of the overtape.

FIG. 5 is a plan view showing a manufacturing process of the bag according to the present invention.

FIG. 6 is a perspective view showing a state in which the bag according to the present invention is filled with contents.

FIG. 7 is an enlarged perspective view of a main part during opening of the bag according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bag main body 2 Overtape 3a, 3b Hot melt adhesive 4 Cutting tape 5a, 5b Slit 6 Knob 7 Peeling part 8 End of bag main body 9 Polypropylene film 10 Rough surface part 11 Tape

Claims (3)

[Claims] A hot melt is applied to one of the opened portions of the bag body, which is longer than the lateral width of the bag body, is coated with a heat sealant on the inner surface, and is folded into two portions to become a front side portion and a rear side portion. Adhesive is provided in a line in the horizontal direction, and a cutting tape made of synthetic resin such as biaxially-stretched polypropylene is attached to the front side, and a slit is inserted into one end of the overtape to insert the cutting tape. The formed overtape is folded in two at the front side and the rear side and wrapped, fused by a heat sealant and a hot melt adhesive by heating to close the end of the bag body, and to pick the tape for cutting. The piece is an easy-open bag that has been separated from the back of the overtape. 2. A heat sealing agent is applied to the inner surface of one of the opened portions having a roughened synthetic resin film of the bag body whose outer surface is subjected to a synthetic resin film treatment, the longer opening being longer than the width of the bag body. In the folded state, hot melt adhesive is provided in a line in the horizontal direction on each of the front side and the rear side, and a cutting tape made of synthetic resin such as biaxially stretched polypropylene is attached to the front side. At one end of the overtape, a slit is inserted to cut the tape for cutting, and the overtape with a knob is formed.The overtape is folded in two on the front side and the rear side, and then wrapped with heat sealant and hot melt adhesive by heating. An easy-open bag in which the end of the bag body is closed by fusing, and the knob of the cutting tape is separated from the rear side of the overtape. 3. The overtape according to claim 1 or 2,
An easy-open bag made of a paper outer tape in which a polyethylene layer, oil-resistant paper, and a heat sealant layer are sequentially formed on the inner surface.