KR100950658B1 - Plastic packing envelopes for packaging the commodities - Google Patents

Abstract

The present invention relates to a bag for packaging a product that can be easily opened. The packaging bag for merchandise was formed in the adhesive layer (12, 30, 32, 34) treated on the opening of the bag to form a strong adhesive force in the untreated portion by forming the untreated portion (14, 29, 31, 33). According to the present invention, it is possible to solve the difficulty of opening when the LLDPE film is directly welded and bonded, and there is an advantage that the open end formed with the adhesive is tightly sealed and bonded.

Description

PLASTIC PACKING ENVELOPES FOR PACKAGING THE COMMODITIES}

The present invention relates to a synthetic resin bag for merchandise packaging, and more particularly, to a synthetic resin bag for merchandise packaging that can be easily opened only when opening the sealed bag.

The merchandise bag is manufactured so that the bag manufacturer can inject the merchandise from the bag film, leaving only the end of the bag and bonding the bottom and both edges to the bag manufacturer. The bag manufacturer then injects the goods into the bag body. It was made to seal the open part. These films are mostly made of LLDPE films.

Such a conventional bag is difficult to open when opening a package if the product manufacturer directly welds the open end, so that the open end is sealed by applying a thermostatic adhesive to the open end. Therefore, when opening, the sealing end which is sealed and bonded by the adhesive is opened, so that the opening operation is easy.

Manufacturers of bag bodies are exploring a number of ways to make it easier for consumers to open sealed bag packaging. Representative of the film used at this time is a synthetic resin film called an easy peel film (easy peel film), such a film is made of polyethylene, the adhesive portion can be easily opened. Most of these films are used in containers that can open the entire film, such as tofu containers, the adhesive strength of the adhesive used in these films has an adhesive strength of about 600 ~ 1200g / 15mm. Such easy peel film can be used as a cover of a solid container, but cannot be used as a commodity bag such as an envelope.

When the film is applied to the bag, the portion that is not to be opened by the consumer may have a weak adhesive strength, and in some cases, the adhered portion may be separated during packaging and transportation of the product therein.

In general, the packing bag of the lower part and both edges of the LLDPE film is welded to each other, so the strength of this part should be 4kg / 15mm or more to obtain a stable bag that does not break the bag during transportation. Typically, an envelope having an LLDPE film layer on its inner surface is usually not subjected to corona treatment on the LLDPE film on its inner surface, so that even when the adhesive is treated, the required adhesive strength does not appear. In a typical merchandise packaging bag, EVA-based adhesives are applied by a gravure coating method to impart hot-melt properties. However, the adhesive treated in this way has a weak adhesive strength, which can easily be separated.

Particularly, in the bag where both sidewalls of the opening end are folded inwards, a layer is formed at the folded part where both sidewalls are formed in the center part. After adhesion, the adhesive force is weakened by the remaining heat due to the restoring force of the film appearing as it is cooled, so that the air inside the air is released to the outside as the adhesive part is separated.

In the related art, in order to solve such a problem, the present invention has been solved by means for adjusting the adhesive strength of an adhesive. However, weakening the adhesive strength of the adhesive was found to be a problem that the strength of the adhesive strength at the portion where both edges are folded in the center of the bag used by folding both edges of the edge opening end inward.

It is an object of the present invention to improve the drawbacks of the conventional bag described above to provide a synthetic resin bag that can be easily opened and maintained airtightness when opening by reinforcing the strength of the adhesive portion while using a conventional EVA-based adhesive. .

The object of the present invention is achieved by a bag for packaging goods of the invention, which is formed by applying an adhesive for sealing an opening of a bag so that a plurality of point adhesive untreated parts appear.

According to the present invention, a synthetic resin bag for merchandise packaging in which a lower end and two edges are welded, an upper end is opened, and an adhesive layer is formed on the inner surface of the open upper end is sealed, and the adhesive layer formed on the inner surface of the opened end is formed of a plurality of viscous adhesives. Composed of a synthetic resin bag for packaging goods characterized by having an untreated portion.

According to the present invention, in a bag made of an LLDPE film, an untreated part 14, 29, 31, 33 is formed in an adhesive layer 12, 30, 32, 34, which is treated at an open part of the bag. By adjusting the adhesive strength to show the adhesive force, it is possible to solve the difficulty of opening in the case where the LLDPE film is directly welded and bonded in a simple manner.

In particular, according to the present invention it is possible to solve the problem that the sealing is not completely made by the incomplete adhesion in the bent line 27, 28 portion folded inward from the bag folded inward to the center of the conventional side walls.

In the present invention, the bag preferably has at least an LLDPE film layer on the inner surface, and the adhesive preferably uses a conventional synthetic resin adhesive of EVA system.

In general, the adhesion strength of the LLDPE resin bonded to each other is more than 4kg / 15mm, but the adhesive strength of the portion bonded with the EVA adhesive appears to be about 500g / 15mm, the adhesive strength of the bonding site is weaker than when the LLDPE is welded.

According to the present invention, the adhesive is treated on the inner surface of the open end of the synthetic resin bag, and the adhesive layer is treated so that an untreated adhesive pointed portion appears. The untreated adhesive pointy part is formed into a round, quadrilateral or oval shape with a diameter of 0.3-0.6 mm. The untreated adhesive portion is formed such that 6 to 8 are formed in the width direction. The untreated adhesive portion is preferably formed at intervals of 0.3 to 0.6 mm. In the non-adhesive pointed portions, the LLDPE films are bonded to each other, and the adhesive strength of the untreated pointed portions has an adhesive strength of about 100 g / 0.5 mm based on the untreated pointed portions having a diameter of 0.5 mm. Assuming that seven are formed in the width direction of the untreated portion, the sum of the adhesive strengths appearing in the untreated portion is approximately 700 g / 15 mm. Such adhesive force in the untreated point portion of the adhesive is added to the adhesive strength of the adhesive, thereby increasing the adhesive strength of the adhesive portion. The adhesive strength of the adhesive untreated point portion can be adjusted by adjusting the size and number of the adhesive untreated portion.

Thus, when the untreated pointed portion is partially formed in the adhesive coating portion, the airtightness that cannot be solved only by the use of the adhesive can be compensated by the layer formed at the folded portion in the bag where both edges of the open end are folded inwardly.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 is a longitudinal cross-sectional view of a synthetic resin bag for merchandise packaging according to the present invention, the bag according to the present invention is EVA-based adhesive on the inner side surface of one side wall of the LLDPE bag main body 10 in which the lower end and the left and right edges are welded by the welding portion (11) Layer 12 was applied, and a plurality of untreated portions 14 were formed in the adhesive layer 12.

2 is a cross-sectional partial enlarged cross-sectional view of the bag for packaging goods according to the present invention, wherein an adhesive layer 12 is applied to the inner surface of the upper side rear side wall 13 of the bag body 10, and the surface 16 of the bag body 1 is applied. ) Was exposed to the outside in the untreated portion 14. The surface 16 of the bag body, which has not been treated with the adhesive described above, is directly welded to the opposite side wall of the bag in which the bag is sealed.

3 is a perspective view of a portion of the front sidewall 21 of the bag in which both sidewalls are folded inward, and the bag body 20 includes the front sidewall 21, the rear sidewall 22, and the left and right sidewalls 23. , (24); It has (25) and (26). The left sidewalls 23, 24 were folded at the central bend line 27, and the right sidewalls 25, 26 were folded at the center bend line 28. The adhesive layer 30 is applied to the upper end of the inner side of the rear side wall as shown in FIG. 2, and the untreated part 31 is also applied to the upper end of the inner side of the left and right side walls 23 and 25. The adhesive layers 32, 34 were formed so that), 33 appear.

4 is a development view in which a portion of the front sidewall 21 of the bag shown in FIG. 3 is cut away and the sidewall is unfolded. According to FIGS. 3 and 4, the front side wall 21 corresponding to the adhesive layer 30 applied to the rear side wall 22 and the adhesive layers 32 and 34 of both side walls 23 and 25, and Adhesive layers were not formed on the left and right side walls 24 and 26. The reason for not applying the adhesive on the inner surface of the sidewalls 21, 24, and 26 as described above is that when the adhesive layer is formed on this portion, the untreated portion of the treated adhesive on the two opposing sidewalls may not exactly match. In this case, it is because the untreated portion of the adhesive is covered by the opposite side adhesive layer so that an improvement in the adhesive strength at the untreated portion cannot be expected.

FIG. 5 is a plan view from above, with no opening end of the bag shown in FIG. 3, and FIG. 6 is a plan view of the bonded state.

EXAMPLE

Example 1

10 parts by weight of EVA and 5 parts by weight of chlorinated polypropylene are dissolved in 85 parts by weight of an organic solvent to prepare an EVA adhesive composition.

The adhesive layer is formed by applying an adhesive layer to have a width of 1 cm by using a gravure printing method on the inner surface of one side wall of the open upper end of the bag formed of the LLDPE film in which the lower end and both edges are welded and the upper end is opened. However, a plurality of untreated adhesive parts having a diameter of 0.4 mm is applied to the portion to which the adhesive is applied so as to be formed at intervals of 0.4 mm to prepare a product packaging bag of the present invention.

[Example 2]

Apply the adhesive used in Example 1 but apply to the bag as shown in FIG. An adhesive was applied to the back sidewall 21 of the coating bag and the surfaces of the left and right sidewalls 23 and 25. The adhesive was applied in the form of a band of 1.2 cm width and applied so that a circular adhesive untreated portion having a 0.5 mm diameter was formed at 0.5 mm intervals.

1 is a longitudinal cross-sectional view of the synthetic resin bag for packaging goods according to the present invention,

2 is a cross-sectional partial enlarged cross-sectional view of a bag for packaging goods according to the present invention;

3 is a plan view of a portion of the front sidewall of the bag in which both sidewalls are folded inwards;

4 is an exploded view in which a portion of the front sidewall of the bag shown in FIG. 3 is cut out and the sidewall is unfolded;

5 is a plan view from the top, before bonding the unsealed end;

It is a top view of the state which bonded the opening edge part.

Claims (5)

In a package for packaging goods in which the lower end and both edges are welded to each other, the upper end is opened, and the adhesive layers 12, 30, 32, and 34 are applied on the inner surface of the open upper end, a plurality of adhesive layers 12, 30, 32, and 34 are formed. The left and right side walls 23, which have unglued portions 14, 29, 31, 33 of which the adhesive layers 12, 30, 32, 34 are bent with the back side walls 13, 22; The product characterized in that the adhesive is not applied to the front sidewall 21 and the bent left and right sidewalls 24 and 26 formed on (25) and to which the adhesive layer of the above-described sidewall is bonded when bonded. Packaging bags. delete delete delete delete

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