JPH0487950A - freestanding bag - Google Patents

Abstract

PURPOSE:To obtain the above standing pouch excellent in standing ability and best suited for heating in a microwave oven by generating the seal line of the bottom edge part of the standing pouch in an arcuate form in which the inside measurement of the pouch is a specific multiple of the substantial depth of the bottom part folded. CONSTITUTION:Since side sheets 1 and 1' are directly heat bonded together at notch parts 3 and 3', both side parts of a bottom sheet 2 are prevented from opening at the places of these notches. At a bottom edge part 5, each of the inner surfaces of the bottom sheet 2 folded double is heat bonded to the side sheets 1 and 1' separately in such a manner that nearly arcuate seal lines 6 and 6' are generated. Given that the inside measurement of the pounch, i.e., a value obtained by subtracting the side seal width from the pouch width is A and a value obtained by subtracting the minimum width of the bottom edge seal from a substantial depth of the bottom sheet folded, i.e., the depth of the bottom sheet folded is B, AomegaB=5-2, with 4-3 preferable thereto.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides a self-supporting bag called a scunding bag,
In particular, it relates to a self-supporting bag suitable for cooking in a microwave oven.

[Conventional technology]

As shown in FIGS. 4 to 6, the self-standing bag has a bottom sheet 2 folded in two between the front and rear side sheets 1-1.1'.
The side sheet 1.1' and the side sheet 1.1' and the bottom sheet 2 are heat-sealed at the side edge 4.4', and the bottom sheet 2 is attached to the bottom edge 5.
Then, the side sheets 1.1' and the bottom sheet 1-2 are heat-sealed, respectively, and at the same time, the bottom sheet 2 is fused so that it will not open.

At this time, if the outer surface of the bottom sheet 2 also has heat-sealing properties, it may be fused as it is when heat-sealing the side edges 4 and 4'; If it does not have adhesive properties, create a notch 3.3' or hole as shown in the figure, fuse the side sheet 1.1' through this notch 3.3', etc., and attach the side edge of the bottom sheet 2. The part is fixed to prevent it from opening.

[Problem to be solved by the invention] In the case of such a self-supporting bag, it is required to stably stand on its own in order to improve the filling and sealing process of the contents and the display effect at the time of sale. Therefore, Utsukai Showa 55-1507
46 Publication, Utility Model Application Publication No. 63158848, etc.,
Although it has been disclosed that the bottom of the self-supporting bag protrudes not in a straight line but in an arcuate or folded line shape, handling in the cutting process and other processes in manufacturing the bag becomes very complicated and increases the cost. In addition, Japanese Patent Publication No. 57-7984 and the above-mentioned Japanese Utility Model Publication No. 63-158848 suggest improvements to the shape and dimensions of the bottom seal, improvements to the dimensions of the bottom sheet, etc., but all of them are complicated. , impractical.

Therefore, an object of the present invention is to provide a self-supporting bag that can be manufactured with conventional productivity, has excellent self-supporting properties, and is especially suitable for cooking in a microwave oven.

[Means of problem solving]

In order to solve the above problems, in the present invention, the seal line at the bottom edge of the self-supporting bag is divided by bag inner width (bag inside - side seal width) ÷ actual bottom material folding depth (bottom sheet folding depth - minimum The width of the bottom seal is 5 to 2.

[Effect]

By making the bag self-supporting as described above, the bottom shape of the bag when opened is close to a circle. The closer the shape is to a circle, the more self-supporting it becomes, but on the contrary, the ability to open the bottom when filling with contents decreases. However, when cooking in a microwave oven, a higher degree of self-sustaining stability is required and effective than in normal cooking.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3. Note that the same parts as in FIGS. 4 to 6 showing the conventional example are given the same reference numerals.

The inner surface of the flexible side sheets 1.1' is heat-sealable, and the bottom sheet 2 is placed between the side sheets 1.1'.
Folded and held. When the bottom sheet 2 is opened, the inner surface has heat-fusible properties, and the outer surface does not have heat-fusible properties. In addition, there are notches 3.3 on both sides of the bottom sheet 2.
' is provided. Then, when the side edges 4.4' and the bottom edge 5 are heat-sealed, the side sheets 1.1' are first heat-sealed to each other in the upper part of the side edges 4.4', and the bottom sheet 2 is At this point, the inner surface of the folded bottom sheet 2 and the side sheets 1 and 1' are respectively fused.

However, in the notch 3.3', the side sheet 1.1
′ is directly heat-sealed, so the bottom sheet 2
This prevents both sides of the door from opening. At the bottom edge 5, the inner surface of the folded bottom sheet 2 is connected to the side sheet 1.1' and a substantially arcuate seal line 6.6.
It is heat fused as shown in the picture.

Here, A is the interior of the bag, that is, the side sill width is subtracted from the inside of the bag, and B is the actual bottom sheet folding depth, that is, the bottom sheet folding depth minus the smallest bottom edge seal 11. When doing so, A+B-5 to 2 is good, and 4 to 3 is more preferable.

If A+B exceeds 5, the bag will fall over with the slightest impact, and if it is less than 2, the bag will stand on its own, but the bottom will not open properly when filling the contents, resulting in poor filling (insufficient weighing, etc.). This is because it is easy to occur.

In addition, the seal line 6.6' is as shown in FIG.
It is generally arcuate, and its radius C is preferably about A/2. As the bag becomes smaller than A/2, the internal volume of the bag decreases, and the self-supporting shape also departs from a cylindrical shape, resulting in poor self-supporting stability and bag bottom-openability. On the other hand, as the size becomes larger than A/2, the opening ability of the bag improves, but the self-supporting shape deviates from the cylindrical shape and the self-supporting stability deteriorates.

However, if the radius C of the seal line is set to A/2, then B1 becomes A/2, so A+B=2 can only be achieved.

Further, it is impossible to set C<A/2. Therefore,
In order to vary B by C-A/2, for example, as shown in the figure, an arc of radius C is ascended, and tangents DE at point D', ,D'E
By setting the seal line as indicated by ', B2 can be varied. Once A, C, and B are determined, θ and θ' are determined, and point D is determined.

When the bottom of such a self-supporting bag is opened, it becomes approximately circular as shown in FIG.

The materials for the self-supporting bag are polyester, stretched nylon,
In addition to single or composite materials such as polypropylene, vinylidene chloride, ethylene vinyl alcohol, polyethylene, and ethylene vinyl acetate copolymer, materials laminated with metal foil, paper, etc. can be selected as appropriate.

Next, an experimental example will be given.

The self-standing bag used in this experiment had side sheets of polyester with a thickness of 12μ / aluminum foil with a thickness of 7μ / thickness of 12μ
polyester/thickness 12μ polyester/thickness 70
It is a laminate consisting of 12μ thick polyester/silver colored/15μ thick vinylidene chloride/white colored/15μ thick stretched nylon/60μ thick polypropylene (heat fused layer). It is a laminate consisting of layers).

And inside the bag is 135mm, A = 119mm,
B = 20 to 70 pus, the height of the bag is 170 II + m, the content is 250 g (water), and the filling suitability (out of 100 bags,
(number of bags with filling defects), normal self-sustainability (observe the inclination of the bag at room temperature, number of defective bags out of 10 bags), microwave oven self-sustainability (cut the top of the bag over the entire IIJ and place it in a 500W microwave oven) The following table shows the results of evaluating the number of collapsed bags out of 10 bags after heating for 3 minutes. The overall evaluation is based on the evaluation with emphasis on filling suitability and microwave oven independence, with A being the best, B being good, and C being poor.Evaluation results [effects] According to , a simple structure in which the seal line at the bottom of the self-supporting bag is arched and the inner width of the bag divided by the actual folding depth of the bottom sheet is set in a specific range of 5 to 2 can improve self-reliance, especially in the microwave oven. A self-supporting bag with excellent self-supporting stability during cooking can be obtained, and it is suitable for modern trends, that is, convenience, and has a remarkable effect in practical use.

[Brief explanation of the drawing]

Fig. 1 is a front view of an unfilled self-standing bag showing an embodiment of the present invention, Fig. 2 is a schematic diagram showing the shape of the seal line, Fig. 3 is a bottom view showing the bottom of the self-standing bag, Fig. 4 5 is an exploded perspective view of a conventional self-supporting bag, FIG. 5 is a front view of the self-supporting bag, and FIG. 6 is a perspective view of the same. 1.1'...Side sheet, 2...Bottom sheet, 3.3'...Notch, 4.4'...Side edge, 5...Bottom edge, 6.6'...Seal line. Patent applicant Toyo Aluminum Co., Ltd. (same as above) Kewpie Co., Ltd. (same as above) Agent Fumi Kamata and 2 others

Claims (2)

[Claims] (1) In a self-supporting bag in which the outer surface of the bottom sheet is non-thermal weldable and the opposing side sheets are fused through holes or notches on both sides of the bottom sheet, the seal line at the bottom edge is inside the bag. A self-supporting bag characterized by having an arcuate shape with a width (bag width - side seal width) ÷ actual bottom sheet folding depth = 5 to 2. (2) Claim (1) wherein the center part of the seal line at the bottom edge of the side sheet and the bottom sheet is an arc and both sides are straight lines.
Freestanding bag as described.