JPS636038Y2 - - Google Patents

Description

[Detailed explanation of the invention] <Industrial application field> This invention is a carrier bag that can be used when customers take home products purchased at department stores, supermarkets, retail stores, etc., or that can be used a very limited number of times. This is related to.

<Prior art> Conventionally, bags made of plastic film have been widely used because they do not tear even when vegetables containing moisture or fresh foods are placed in them. Used in clothing sales.

However, bags made of this type of film are extremely flexible, so unless the size of the product inside approximately matches the size of the bag, the product or other items will be closer to the center of the bag and the bottom of the bag will be Bags that are made entirely of thick film, such as bags for clothing, are recommended because they sag, look unsightly, and impair fashionability.
A separate piece of cardboard is used at the bottom.

However, in the former case, making the entire film that forms the bag's fabric thick is a waste of resources, and processing, especially heat welding, takes time, increasing processing costs. Also, inserting cardboard like the latter,
It takes a lot of work, and if it gets wet, its rigidity will be lost.

<Problems to be Solved> This invention is intended to reinforce the bottom of such extremely flexible bottom gusset bags made of plastic film, to make the bag look good when carried in the hand, and to be easy to manufacture. The purpose is to reduce manufacturing costs.

<Means for solving the problem> This invention is based on a bottom gusset side seal type carrier bag, in which a reinforcing sheet is provided over almost the entire width of the bottom gusset portion with a length that matches the width of the bag, and at least around the periphery. The reinforcing sheet is attached or welded to the bag-shaped film, and the reinforcing sheet has a direction of 45 degrees from the valley of the bottom gusset at both ends of the reinforcing sheet toward both edges of the reinforcing sheet and the folding depth of the bottom gusset. The plastic film bottom is characterized in that the reinforcing sheet is provided with easy-to-fold lines consisting of several parallel lines that are very close to each other, in the vicinity of positions parallel to both side edges of the bag, on the inner side of both ends of the bag. It is a gazette type carrier bag.

<Function> In this device constructed as described above, a large number of unused bags are stacked flat or stored by hanging them using the handle portion of each bag. When used next time, unfold it like a normal bag and the bottom gusset part will be folded to form a square bottom. At that time, the bag of the several easy-to-fold lines of the reinforcing sheet will have the most stylish square bottom. The reinforcing sheets are bent from the easy bending lines at the positions to form a square bottom bag with a reinforced bottom.

<Effects> In the bag of this invention, which is constructed and operates as described above, a reinforcing sheet is attached to the entire width of the bottom gusset bag, and when the bag is expanded, both the film of the bag and the auxiliary sheet can be folded easily as described above. Since it is folded from the wire, not only the bottom of the bag but also the rising parts near both ends of the bottom are reinforced, creating a strong bottom. However, the degree to which the bag sag is significantly reduced and the appearance is good.

In particular, since the reinforcing sheet's several easy-to-fold lines are formed by several very close parallel lines, the actual bending is done by several lines, and the corner corners of the bag are The bag is not too sharp, and the stress concentration due to the load is not concentrated on one point or line at the bent portion, resulting in a durable bag that can withstand multiple uses rather than just being thrown away.

In addition, even if the position of attaching the reinforcing sheet to the film of the bag is slightly misaligned, this bag has several easy-folding lines in parallel, so the bag can be bent from any of the easy-folding lines. Since the square bottom of the bag is formed, there is no need to increase the processing accuracy of the bag, and manufacturing costs can be reduced.

This invention will now be explained based on a representative example.

Generally, this type of bottom gusset bag B is shown in Figures 1 and 2.
As shown in the figure, the bag is made of a single piece of plastic film 10 that is continuous from one side to the other through a bottom gusset part 11, and both side edges 13 are heat-welded to each other to form a so-called side seal type bag B. It's summery. This invention will be explained in detail based on such a bag B.

<Example 1> (See Figures 3 and 4) A reinforcing sheet 14 that reaches almost the entire width of the bottom gusset part 11 of bag B and has a length corresponding to the width of bag B is placed inside the gusset part 11. The reinforcing sheet 14 is made of the same material as the plastic film 10 of bag B, and can be heat-welded to each other.
Use a film that is equivalent to or thicker than that, or a slightly harder film, or a foam sheet.

As shown in FIG. 4, the reinforcing sheet 14 has a heat-welded seal portion 15 in the shape of a base grain around the entire circumference and in the middle portion thereof.
The reinforcing sheet 14 is attached to the plastic film 10 at the position where it should be bent when the bag B is expanded to form a square bottom, that is, at both ends of the reinforcing sheet 14, from the valley 16 of the bottom gusset part 11, respectively. Several easy-to-bend pieces are placed very close to each other in a direction of 45° toward the edge, parallel to both edges 18 of the reinforcing sheet 14, and inside the folding depth h of the bottom gusset portion 11 from both edges 18. Lines 19 and 20 are provided, respectively. The intervals between the easy bending lines 19 and 20 are approximately 2 to 5 mm, and the number may be approximately 2 to 5, but there is no particular limitation to these numbers.

<Example 2> Unlike the above-mentioned Example 1, reinforcing sheets 14a, 1
4b is divided into left and right parts with the valley 16 of the bottom gusset part 11 as a boundary, and each reinforcing sheet 14
a, 14b are respectively bonded to the bottom gusset part 11 on the entire periphery and in the intermediate position thereof in the form of base grains or coarse knurlings by heat-welding seal parts 15, and easy bending lines 19, 20 are also provided in the same way. (See Figure 5).

<Operations and Effects of Embodiment 1 and Embodiment 2> In each of the embodiments of this invention constructed as described above, when the bottom gusset portion 11 is folded to form a square bottom when the bag B is expanded, the above-mentioned Since the reinforcing sheet 14 also has easy-folding lines 19 and 20, it is easier to form a square bottom shape than one of the several easy-folding lines 19 and 20. Even if the bag is folded and items such as products are placed inside bag B,
Not only the bottom of bag B, but also the lower part of both sides of bag B,
The reinforcing sheet 14 stands up (see FIG. 6),
The bag B is sufficiently reinforced so that the bottom of the bag B does not sag and becomes a good-looking bag B.

In particular, the easy bending lines 19 and 20 of the reinforcing sheet 14
is formed by several parallel lines that are very close to each other, so in reality, the bends are shared by several lines, and the corners are not too sharp and the stress concentration against the load is concentrated at one point or at the bend. It becomes a durable bag B without concentrating on one line, and it can withstand multiple uses without being simply discarded.

Further, a method of manufacturing the bag B having the structure as described above will be explained using the bag shown in FIG. 4 as an example.

First, the both edges 41 of the wide and long bag film material 40 are folded inward by a slight width, and at the same time, the long reinforcing sheet material 42 is sequentially folded inside the bag film material 40. Heat weld in sequence at the center position. Easy folding lines 19 and 20 are provided in advance on this reinforcing sheet material 42 at pitches corresponding to bag B.

Next, the pasted raw fabrics 40 are sequentially folded in half, and the portion where the reinforcing sheet raw fabric 42 is pasted is gusset-folded, and then the easy folding line 19 on the reinforcing sheet raw fabric 42 is folded. Welding together the original fabrics 40 and 42 in the transverse direction at a portion that coincides with the valley 16 of the gusset portion, and cutting or welding the parts,
Obtain bag B with bottom gusset.

In the embodiment of this invention, when manufactured by adopting the above method, the easy bending line 19 and the sealing position of the raw fabrics 40, 42 which become the side edges 13 of the bag B are the positions of the valleys of the bottom gusset part 11. Since there are several easy-folding lines 19 and 20 each, one of them will match the seal position even if there is a slight deviation, so there is a wide tolerance range for seal positioning during manufacturing, and the bag This has the advantage that B can be manufactured easily.

<Unique Effects of Embodiment 1> Since the reinforcing sheet 14 substantially matches the full width of the square bottom, the shape of the bag B does not easily collapse when an item is placed in the bag B.

<Unique Effects of Embodiment 2> Since the reinforcing sheets 14a and 14b are welded separately on the left and right sides, when the empty bag is folded, when the valley 16 of the bottom gusset section 11 is folded, many The bags are not bulky when stored, transported, or sold.

In addition, in each embodiment of this invention, the film 10 of the bag and the reinforcing sheet 14 are bonded together by heat welding, but the invention is the same even if the film 10 and the reinforcing sheet 14 are bonded together by adhesive.

[Brief explanation of the drawing]

The drawings relate to this invention, and FIGS. 1 and 2 are partially vertical perspective views showing an example of a known bottom gusset bag, FIG. 3 is a longitudinal side view of the bottom gusset part of the present invention, and FIG. 5 is a developed plan view of Example 2, FIG. 6 is an enlarged longitudinal sectional front view of an easy bending line, and FIG. 7 is an explanatory view showing an example of a manufacturing method. Codes in the figure: B...Bag, 10...Film for bags,
11...Bottom gusset part, 14...Reinforcement sheet, 1
5... Welded portion, 16... Valley, 19, 20... Easy bending line.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a bottom gusset side seal type carrier bag, a reinforcing sheet covers almost the entire width of the bottom gusset portion with a length that matches the width of the bag, and a bag-shaped film is provided at least in the periphery. The direction is 45 degrees toward both edges of the reinforcing sheet from the valley position of the bottom gusset at both ends of this reinforcing sheet, and the folding depth dimension of the bottom gusset is from both ends of the reinforcing sheet. A bottom gusset type carrier bag made of plastic film, characterized in that the reinforcing sheet is provided with easy-folding lines consisting of several parallel lines that are very close to each other on the inside near positions parallel to both edges of the bag. . 2. The plastic film bottom gusset type handbag according to claim 1, wherein the reinforcing sheet is a single sheet covering the entire width of the bottom gusset portion. 3. The plastic film bottom gusset type carrier bag as claimed in claim 1, wherein the reinforcing sheet is two reinforcing sheets divided into two left and right parts at the valley position of the bottom gusset part. .