JPS6311082Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a valve structure for a gas-tight bag.

[Prior Art] For example, sealed bags made of plastic are often used as toys for young children in the shape of animals.
These sealed bags are equipped with a valve for introducing gas such as air, and the bag is used by introducing air through the valve to inflate the bag. Therefore, it is necessary to provide a valve structure that prevents gas such as air inside the inflated bag from escaping to the outside and contracting during use. Moreover, it is required that the shape of the bag itself is not obstructed.

By the way, as shown in FIG. 1, a conventional valve structure includes a gas introduction part 2 of a gusset type, which is integrated with a plastic sheet constituting a gas-tight bag 1 and has a cylindrical shape with its tip end folded inward. As shown in FIG. 2, there are known types that are integrated with the plastic sheet constituting the gas-tight bag 1 and that have a cylindrical dovetail-shaped gas introduction part 3. The gusset type valve structure shown in Fig. 1 supplies air etc. from the gas introduction part 2, and when the gas-sealed bag 1 expands, the internal pressure of the air causes the cylindrical part folded inward to come into close contact with each other. This prevents the air inside the bag 1 from escaping. In addition, the valve structure shown in Fig. 2 supplies air etc. from the gas introduction part 3, and when the gas-sealed bag 1 expands, the dovetail-shaped constricted part of the gas introduction part 3 comes into close contact with the internal pressure of the air inside. This prevents the air inside the bag 1 from escaping.

[Problems to be solved by the invention] However, in both the valve structures shown in FIGS. 1 and 2, the cylindrical gas introduction parts 2 and 3 are integrally attached to the sealed bag 1, Introduction part 2,
The shape of 3 impairs the appearance of the bag 1. Also,
In the case of the gusset type valve structure, if a flexible plastic sheet is used as the plastic sheet constituting the bag 1, air leakage from the bag 1 can be effectively prevented. When the sheet is made of hard plastic, there is a problem in that the inwardly folded cylindrical portion does not adhere tightly due to the internal pressure of the air in the bag 1, and the air blocking effect is not sufficiently exerted. With the dovetail-shaped valve structure, the air blocking effect inside the bag 1 is low, and especially if the plastic sheet composing it is hard, there is almost no air blocking effect, and the air inside the bag 1 may leak out during use. occurs.

The present invention was made to solve the above-mentioned conventional problems, and it is possible to have high gas barrier performance in the sealed bag and to improve the appearance of the sealed bag without having a cylindrical gas introduction part. The purpose is to provide a valve structure for a gas-tight bag.

[Means for Solving the Problems] The present invention has a gas introduction hole bored at a desired location in a sheet of a gas-tight bag, and at least covers the introduction hole on the inner surface of the sheet, and also covers the gas introduction hole and the bag. a stopper sheet fixed so as to communicate with each other; a ring-shaped seal portion of one or more layers formed by welding the bag sheet and the stopper sheet around the gas introduction hole; and this sheet. This is a valve structure for a sealed bag characterized by having a gas circulation hole opened in a part of the bag.

[Function] According to the present invention, by inserting a straw or the like into the gas introduction hole and supplying air into the sealed bag, the air passes through the gas circulation hole opened in the ring-shaped seal part to create a gas-tight seal. It is supplied between the sheet of the bag and the stopper sheet, and is further supplied into the bag through the communication portion between the sheet of the gas-tight bag and the stopper sheet, and the bag is inflated. Due to this expansion of the bag, the stop sheet comes into close contact with the sheet of the gas-sealed bag, and the communication part between them, the gas communication hole opened in a part of the league-shaped seal part, and the gas introduction hole are also closed. It will be done. As a result, the gas barrier performance within the sealed bag can be significantly improved, and the escape of gas within the bag during use can be reliably prevented. In particular, even if the gas introduction hole of the inflated bag is pressed during use and the stopper sheet is separated from the gas introduction hole,
The air inside the gas-sealed bag is blocked at two or more points: the communication part between the bag sheet and the stopper sheet, and the gas circulation hole opened in at least one ring-shaped seal part. It can prevent gas from escaping. Moreover, since only the gas introduction holes are opened on the outer surface of the sealed bag sheet, the appearance can be improved.

[Embodiments of the invention] Hereinafter, embodiments of the invention will be described in detail with reference to FIGS. 3 and 4.

Reference numeral 11 in the figure is a gas-tight bag formed by sealing the peripheries of two circular plastic sheets 12a and 12b. This bag 11 is provided with a valve 13. This valve 13 is connected to the bag 11
One plastic sheet (e.g. 1
2a) is provided with a gas introduction hole 14 bored therein. On the inner surface of the plastic sheet 12a,
A band-shaped stopper sheet 15 is provided to cover the introduction hole 14 and to communicate between the introduction hole 14 and the inside of the bag 11. That is, the stopper sheet 15 has a seal portion welded together with the two plastic sheets 12a and 12b at both ends, and a seal portion that is welded together with the two plastic sheets 12a and 12b.
and an outer seal part 16 formed by welding at two places along the width direction, and the stopper sheet 16 and one plastic sheet 12 are fixed in a direction substantially parallel to the outer seal part 16.
A communicating portion is formed as an unwelded portion of a.
This stopper sheet 15 is, for example, the bag 11
It is made of plastic that is thinner and more flexible than the plastic sheets 12a and 12b that constitute it. Note that the two plastic sheets 12 are located near both ends of the stopper sheet 15.
When the plastic sheets a and 12b are integrally welded and fixed at the seal portions, a communication portion is formed between the periphery of the stopper sheet 15 excluding the weld portions at both ends and one plastic sheet 12a. The outer seal portion 16 may be omitted. An annular seal portion 17 formed by welding the stopper sheet 15 and the plastic sheet 12a is provided in a portion of the plastic sheet 12a between the gas introduction hole 14 and the outer seal portion 16. . A gas flow hole 18 is opened in a part of the annular seal portion 17 along the longitudinal direction of the stopper sheet 15 .

According to such a configuration, when a straw 19 is inserted into the gas introduction hole 14 of the valve 13 and air is supplied from the straw 19 into the sealed bag 11 as shown in FIG.
a. Stopper sheet 15 and annular seal portion 1
From the space surrounded by
2a and the stopper sheet 15 through the communication part which is an unsealed part, and is supplied into the bag 11.
is expanded. After inflating the bag 11 by supplying a predetermined amount of air into the bag 11, when the straw 19 is removed from the gas introduction hole 14 of the valve 13, as shown in FIG. Due to the internal pressure, the stopper sheet 15 was brought into close contact with one of the plastic sheets 12a in which the gas introduction hole 14 was opened, and the gas introduction hole 14 was opened in the communication part between the sheets 15 and 12a and in a part of the annular seal part 17. Gas distribution hole 1
8. Furthermore, the gas introduction hole 14 is also closed. the result,
The gas barrier performance within the sealed bag 11 can be significantly improved, and the escape of gas within the bag during use can be reliably prevented. In particular, even if the gas inlet hole 14 of the inflated bag 11 is pressed during use and the stopper sheet 15 is separated from the gas inlet hole 14, the air inside the bag 11 will flow through the plastic sheet 12a of the bag 11 and the stopper sheet 15. Since the communication between the bags 15 and the gas distribution hole 18 opened in the annular seal part 17 are blocked in two places, the gas inside the bag can be prevented from escaping, and the bag can be kept in a predetermined inflated state for a long period of time. can be held.

Therefore, according to the valve structure of the present invention, FIGS.
Unlike the conventional valve structure shown in the figure, the cylindrical gas introduction parts 2 and 3 are not attached, so the appearance of the sealed bag can be significantly improved, and as mentioned above, the gas barrier performance inside the sealed bag can be improved. It can be significantly improved. In particular, in the valve structure of the present invention, even if the plastic sheets 12a, 12b constituting the bag 11 are hard and have poor flexibility, the stopper sheet 15 is flexible regardless of the plastic sheets 12a, 12b. It is possible to select one with a high level of gas barrier performance, ensuring good gas barrier performance at all times.

Note that the valve structure of the present invention is not limited to that shown in FIGS. 3 and 4 described above, but may be, for example, the structure shown in FIG. 7 or 8.

That is, the valve 13 shown in FIG. 7 connects two points in the width direction of the stopper sheet 15, which is shorter than that shown in FIG.
2a, and the plastic sheet 12a and the stopper sheet 15 are fixed to the portion of the plastic sheet 12a between the gas introduction hole 14 and the outer seal portion 16. There are double annular seal parts 17a and 17b formed by welding the inner annular seal part 17a in the longitudinal direction of the stopper sheet 15, and the outer annular seal part 17b in the longitudinal direction of the stopper sheet 15. Stopper sheet 1
Gas circulation holes 18a, 18 are provided in the widthwise portions of 5, respectively.
It has an open structure. According to the valve having such a structure, by providing the two annular seal portions 17a and 17b with the gas circulation holes 18a and 18b opened, the bag 1 is made smaller than the valve structure of the previous embodiment.
The gas barrier performance of No. 1 can be further improved.

The valve 13 shown in FIG. 8 is formed by welding both ends of a stopper sheet 15, which is shorter than that shown in FIG. The plastic sheet 12a is fixed by the letter-shaped outer seal portion 16, and is formed by welding the plastic sheet 12a and the stopper sheet 15 to the portion of the plastic sheet 12a between the gas introduction hole 14 and the outer seal portion 16. square shaped seal part 17'
Further, gas flow holes 1 are provided in the longitudinal direction portion of the stopper sheet 15 of the rectangular seal portion 17'.
It has a structure with 8 openings. According to the valve having such a structure, it is possible to achieve the same effect as the valve structure of the above embodiment.

Further, the valve structure according to the present invention is not limited to the case where a single or double ring-shaped seal portion is provided as in the above embodiment, but may be provided with a triple ring-shaped seal portion. The shape of the ring-shaped seal portion may also be arbitrary, such as a circular shape, a square shape, a hexagonal shape, etc.

Further, in the above embodiments, gas (air, etc.) was introduced into the bag using a straw, but the present invention is not limited to this. For example, the bag may be inflated by inserting a nozzle connected to a gas cylinder containing hydrogen gas or the like into the gas introduction hole of the valve.

[Effects of the invention] As detailed above, according to the invention, the gas barrier performance inside the sealed bag is high and the appearance of the sealed bag is improved without having a cylindrical gas introduction part unlike the conventional structure. In addition, it is possible to provide a highly practical valve structure for a gas-tight bag that can achieve diversification of the uses of the sealed bag.

[Brief explanation of the drawing]

Figures 1 and 2 are schematic diagrams showing conventional valve structures, Figure 3 is a plan view of a valve structure for a gas-tight bag showing an embodiment of the present invention, and Figure 4 is a line taken along the - line in Figure 3. FIGS. 5 and 6 are sectional views for explaining the operation of the valve structure of the present invention, and FIGS. 7 and 8 are respectively sectional views showing other embodiments of the valve structure of the present invention. FIG. 11... Gas sealed bag, 12a, 12b... Plastic sheet, 13... Valve, 14... Gas introduction hole, 15... Stopper sheet, 17, 17a,
17b, 17'... Seal portion, 18, 18a, 1
8b...Gas distribution hole.

Claims (1)

[Scope of utility model registration request] a gas introduction hole bored at a desired location on a sheet of a gas-sealed bag; and a stopper sheet fixed to the inner surface of the sheet so as to cover at least the introduction hole and communicate the introduction hole with the inside of the bag. , comprising a single or more ring-shaped seal part formed by welding the bag sheet and a stopper sheet around the gas introduction hole, and a gas circulation hole opened in a part of this seal part. The valve structure of the sealed bag is characterized by: