JPS6013784Y2 - packaging bag - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a packaging bag.

As a packaging bag, for example, one in which a film is extended from an upper header part provided with a reinforcing sheet and a product packaging part is provided in the lower part is known. No proposal has yet been made in which the packaging portion is made of a heat-shrinkable film.

The reason for this is that while the header section is made of a strong material with a reinforcing sheet, when the product packaging section is configured to be heat-shrinkable, the header section becomes stiff due to the tension caused by the heat-shrinking. It is presumed that this is because the convex deformation not only spoils the appearance but also loses its original function as a header section.

Therefore, although there is a demand for the packaging section to have good adhesion to the stored product, the present situation is that the above-mentioned type of bag body equipped with a header section cannot meet this demand.

The present invention provides a packaging bag in which the product packaging part is made of a heat-shrinkable film even if the bag is of the above type, and the header part does not deform after heat shrinking and can perform its original function. The purpose is to

Therefore, the feature is that in a bag body in which a product packaging section is provided at the bottom by extending a film from an upper header section provided with a reinforcing sheet, the film of the product packaging section is made of a heat-shrinkable film. At the same time, the film of the upper header part is extended below the lower edge of the reinforcing sheet of the header part to form a neck part, and the upper edge of the film of the product packaging part is welded to this neck part, and the film continues to the neck part. Both side edges of the film of the product packaging part are formed into downwardly expanding tapered edges to form shoulders, and the neck part and the shoulders constitute a deformation absorbing part that alleviates heat shrinkage deformation of the product packaging part. It is in.

Embodiments of the present invention will be described below in detail with reference to the drawings. FIGS. 1 to 4 show a first embodiment, in which a bag body 1 includes an upper header section 2 and a lower product packaging section 3.

The header section 1 is constructed by welding covering films 5 and 6 to the front and back sides of a reinforcing sheet 4 made of thick synthetic resin film or synthetic paper, and extending the films 5 and 6 beyond the lower edge of the reinforcing sheet 4. It has a neck 8.

The covering films 5 and 6 are made of polypropylene or polyethylene, and the reinforcing sheet 4 and the covering films 5 and 6 are made of polypropylene or polyethylene.
None of them have heat shrinkability.

The product packaging section 3 is composed of front and back films 9, 10 made of heat-shrinkable films, and these films 9, 1
0 are each welded 11 to the neck portion 8 over the width direction of the bag body 1.

The bag body 1 is manufactured by fusing and welding both side edges 12 and 12 based on the above structure, and although the bag has an opening 13 at the lower end in the illustrated example, the opening 13 can be freely sealed with adhesive or the like as appropriate. be.

Both side edges 12, 12 of the bag body which are melted and welded are connected to the neck part 8.
A shoulder portion 15, which has a tapered edge 13, 13 that widens downward at the upper end portion of the product packaging portion 3, and has a tapered edge 14, 14 that widens downward at a steeper angle at the upper end portion of the product packaging portion 3 that follows this. 1
5.

In the drawing, reference numeral 16 indicates a hanging hole opened in the header section 2, and the covering films 5 and 6 are attached to the reinforcing sheet 4 at the periphery of the hole.
It is welded to 17.

Reference numeral 18 denotes a tear line such as a perforation provided in the product packaging section 3, and is provided on either or both of the front and back films 9 and 10.

According to this first embodiment, said neck part 8 and shoulder part 15.1
5 constitutes a deformation absorbing section 19 that alleviates heat shrinkage deformation of the product packaging section 3.

That is, the product 20 is inserted into the bag body 1 through the lower end opening 13, and the front and back films 9 and 10 near the opening are sealed by welding and welding to each other, and then heated to close the front and back films of the product packaging section 3. When 9 and 10 are heat-shrinked, the product packaging portion 3 is suitably brought into close contact with the product 20 as shown in FIGS. 3 and 4.

At this time, near the upper end of the product 20, the product packaging section 3
is formed to be slightly wider than the neck part 8 via the shoulders 15, 15, so that it will not shrink to a so-called jet shape and will not shrink to a width narrower than the neck part 8 after heat shrinking as a margin. 3, it is contracted into a state in which it is aligned approximately on the same line as the neck portion 8, as shown in FIG.

In addition, the tension of the front and back films 9, 10 due to heat shrinkage forces the neck portion 8, which can be deformed in the direction of separation from each other, on the covering film 5,
Therefore, the reinforcing sheet 4, which threatens the header portion 2, will not directly receive this tension and become a round shape.

5 and 6 show a second embodiment of the present invention, in which the header portion 22 is formed by welding a covering film 26 to one surface of the reinforcing sheet 24 similar to the above, and attaching the film 26 from the lower edge of the reinforcing sheet 24. A neck portion 28 is also provided.

Similarly to the above, neither the reinforcing sheet 24 nor the covering film 26 has thermal shrinkage.

The product packaging section 23 is composed of front and back films 29 and 30 made by half-folding and polymerizing a heat-shrinkable film at the lower end, and the upper edge of the back film 30 is welded 27 to the neck part 28.

The back film 3o is provided with shoulder portions 35, 35 having downwardly expanding tapered edges 34, 34 on both side edges connected to the neck i28, and the opening edge 41 of the front film 29 is formed by the tapered edges m34, 34.
It is located lower than 34.

The bag body 21 is manufactured by fusing and welding both side edges 32, 32 based on these configurations.

An adhesive tape 42 is provided at the upper end of the reinforcing sheet 24,
As shown in FIG. 6, the header portion 22 is bent to the chain line position and the adhesive tape 42 is adhered to the front film 29, so that the opening 43 can be freely sealed.

In this embodiment as well, the neck portion 28 and the shoulder portion 3
5.35 constitutes the deformation absorbing part 19 that relieves heat shrinkage deformation of the product packaging part 23.

FIG. 7 and FIG. 8 are comparative examples to the embodiment of the present invention, and are basically based on the same form as the second embodiment, but
The reinforcing sheet 24 of the header section 22 extends inward from the opening 43 of the product packaging section 23.

Therefore, the reinforcing sheet 2 does not have anything corresponding to the neck part.
The tapered edges 34,3
It forms a shoulder 35.35 with 4.

The ninth example is also a comparative example, and the reinforcing sheet 24
The product packaging part 23 is attached to the covering film 26 near the lower end of the cover film 26.
A back film 30 is welded to the upper end of the front film 29, and an auxiliary film 44 having the same quality as the covering film 26 and not having heat shrinkability is welded to the upper end of the front film 29 to form an opening 43. It forms shoulders 35, 35 with edges 34, 34.

In both of these comparative examples, the shoulder parts 35, 35 constitute the deformation absorbing part 19 that alleviates the heat shrinkage deformation of the product packaging part 23, so compared to the one having a neck part like the embodiment of the present invention. , the ability to absorb deformation is poor.

As a result of the above configuration, the present invention has a header section at the top,
This type of bag has a product packaging section at the bottom.The product packaging section is made of a heat-shrinkable film, which allows products to be stored tightly and stably. By suitably absorbing and relaxing the water through the buffer, it is possible to prevent the header from directly affecting the header, thereby allowing the header to perform its original function.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the first embodiment of the present invention, Fig. 2 is a vertical sectional view of the same, Fig. 3 is a front view showing the product in the stored state,
5 is a front view showing the second embodiment, FIG. 6 is a longitudinal sectional view thereof, FIG. 7 is a front view showing the comparative example, and FIG.
The figure is a longitudinal sectional view of the same, and FIG. 9 is a longitudinal sectional view showing a comparative example. 1.21...Bag body, 2,22...Header section, 3.23...Product packaging section, 4,24...
... Reinforcement sheet, 8, 28 ... Neck, 9,
10,29,30...Front and back films (heat shrinkable film), 15.35...Shoulder, 19...
...Deformation absorption part.

Claims (1)

[Scope of utility model registration request] In a bag body in which a product packaging section is provided at the bottom by extending a film from an upper header section provided with a reinforcing sheet, the film of the product packaging section is constructed of a heat-shrinkable film, and the header section is reinforced. The film of the upper header part is extended below the lower edge of the sheet to form a neck part, the upper edge of the film of the product packaging part is welded to this neck part, and both side edges of the film of the product packaging part continue to the neck part. A packaging bag characterized in that a shoulder is formed on a downwardly expanding tapered edge, and the neck and the shoulder constitute a deformation absorbing part that alleviates heat shrinkage deformation of the product packaging part. .