JPH0623861A - Air bag and production thereof - Google Patents

Abstract

PURPOSE:To obtain an air bag used as a heat insulating material or a buffer material and capable of being easily and efficiently produced. CONSTITUTION:An air bag is obtained by successively laminating a pair of polyethylene resin layers 4, 10, a pair of anchor coat layers 6 and a pair of base film layers 2, 12 from the inside to the outside through release layers 8. In this air bag, a check valve not shown in a drawing is arranged between the release layer 8 and the polyethylene resin layer 10 adjacent to the release layer 8 in order to fill the air bag with air and, by introducing air into the air bag from the air injection port of the check valve, the release layer 8 and the polyethylene resin layer 10 are pressed by the pressure of air to be mutually released and, as a result, an air chamber 18 is formed between both layers 8, 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air bag suitably used as a cushioning material, a heat insulating material, an air mat which can be used as a cushion, sheets and the like, and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, as an air bag used as a cushioning material or the like, two sheets of heat-sealing sheets are stacked and molded into a bag by a heat-sealing, An air bag in which air is enclosed is provided. However, in the manufacturing process, since the heat seal is generally made by a pressing die using a heating rod or the like, it is necessary to make a heating rod having a complicated shape, and the work must be intermittent. Therefore, the production efficiency cannot be increased.

[0003]

SUMMARY OF THE INVENTION Therefore, the technical problem to be solved by the present invention is to provide an air bag that can be easily and efficiently manufactured, and to manufacture such an air bag. Is to provide a method for manufacturing the same.

[0004]

In order to solve the above problems, according to the present invention, an air bag having the following structure is provided.

That is, in this air bag, the first base film and the second base film are sandwiched by a release layer having a pattern corresponding to a desired air chamber pattern. Then, they are glued together.

In the above structure, the release layer is interposed between the first and second base films in at least three modes. That is, this release layer comprises the first base film, the first base film,
Between an adhesive layer for adhering two base films, or between a second base film and an adhesive layer, or an adhesive layer and a second base laminated on the first base film. It is interposed between the adhesive layer and the adhesive layer laminated on the film.

In the above structure, if the release layer is interposed between the first base film and the adhesive layer laminated on the first base film, the first base film is provided. Base
Either the first base film or the adhesive layer, which is designed so that when air is press-fitted between the base film and the adhesive layer, it is pressed by the pressure of the air and weakly adheres to the release layer. Peeling occurs at the interface between one and the release layer, and an air chamber is formed between both layers. That is, by feeding air between the layers, an air bag having an air chamber formed corresponding to the pattern can be obtained.

Further, according to the present invention, there is provided a manufacturing method suitable for manufacturing the air bag having the above structure.

That is, in the air bag having the above construction, the release layer is printed by gravure printing, flexographic printing or the like on the first base film or on the first base film. It can be manufactured by forming on the above or the above-mentioned second base film.

By adopting the above method, a release layer having a pattern corresponding to the desired air chamber pattern can be formed continuously, freely and easily, and the production efficiency is greatly improved. Can be raised to

[0011]

Embodiments of the present invention will be described in detail below with reference to FIGS.

First, a first embodiment will be described with reference to FIGS.

FIGS. 1 and 2 are an overall plan view and a partially enlarged view of the air bag according to the present embodiment, respectively, and FIGS.
Shows the cross section of the main part of the air bag shown in FIGS. 1 and 2, respectively. Further, FIG. 6 shows the stacking process of the air bag in order.

As shown in FIG. 3, this air bag comprises a first base film 2, an anchor coat layer 6, a first polyethylene resin layer 4 as an adhesive layer, and a release layer 8. The second polyethylene resin layer 10 serving as an adhesive layer, the anchor coat layer 6, and the second base film 12 are sequentially laminated. 1 and 2
Reference numeral 18 denotes an air chamber of the air bag, and the release layer 8 has a pattern corresponding to a desired air chamber pattern as shown in the drawing, and the first polyethylene resin layer Four
To be laminated. As shown in the figure, the air chamber 18 is formed by connecting a plurality of vertically elongated cells to each other. Corresponding to this pattern, the release layer 8 is made of the first polyethylene-based material. It is formed continuously on the resin layer 4.

On the other hand, in FIGS. 1 and 2, reference numerals 15 and 16 respectively denote an air injection path and its injection port provided for sending air into the air chamber 16, and 14 denotes this injection port 1.
It is a valve film provided in No. 6. This valve film 14
Is a pair of films 14a, 14 as shown in FIG.
One end of each of the films 14a and 14b is bonded to the first polyethylene resin layer 4 and the second polyethylene resin layer 10 from which the release layer 8 has been removed. On the other hand, the other ends of the films 14a and 14b are in close contact with each other, and the valve film 14 functions as a check valve capable of sending air only in one direction from the inlet 16 of the air inlet 15. Is configured.
The hatched portions in FIGS. 1 and 2 have the first polyethylene resin layer 4 without the release layer 8 interposed therebetween.
The portion where the second polyethylene resin layer 10 and the second polyethylene resin layer 10 are bonded is shown.

When air is press-fitted from the air inlet 16, the valve film 14 opens and the air is introduced into the air inlet 15.
Be guided to. Then, due to the air pressure, the release layer 8 and the second polyethylene resin layer 10 which are in a weakly adhered state as shown in FIG.
An air chamber 18 is formed between the layers 8 and 10 as shown in FIG. Then, by further continuing to press in the air, the separation of both layers 8 and 10 extends to the entire air bag, and an air bag having the air chamber 18 as shown in FIG. 1 is formed.

Next, a method of manufacturing the air bag having the above structure will be described with reference to FIG.

First, as shown in (I), for example, 7 to 2
Anchor coat layer 6 was formed on the first base film 2 having a thickness of 5 μm by polyethylene extrusion lamination.
Then, the first polyethylene resin layer 4 is formed on the anchor coat layer to have a thickness of, for example, 15 to 50 μm.

Then, as shown in (II), a release layer 8 having a pattern corresponding to the desired air chamber pattern is gravure-printed or flexographically printed on the first polyethylene resin layer 4. It is formed by printing or the like.

Then, as shown in (III), on the entire surface of the first polyethylene resin layer 4 on which the release layer 8 is formed,
A second polyethylene resin layer 1 made of the same material as the first polyethylene resin layer 4 by extrusion of polyethylene.
No. 0, for example, 15 to 50 μm, and an anchor coat layer 6 made of the same material as that of the first base film 2 was applied on the second polyethylene resin layer 10 7
A second base film of .about.25 .mu.m is laminated.

Then, as shown in FIGS. 1 and 2, at a predetermined portion of the air bag, a part of the interface between the second polyethylene resin layer 10 and the release layer 8 in a weakly adhered state is peeled off. Then, the valve films 14a and 14b are inserted between the two layers 10 and 8, and the release layer 8 is formed in order to enable the seal between the one of the valve films 14a and the first polyethylene resin layer 4.
Remove part of. And each valve film 14a, 14b
As shown in the drawing, one end of each is bonded to the first polyethylene resin layer 4 and the second polyethylene resin layer 10, respectively.

Then, after performing the air filling operation from the air inlet 16 as described above, the air bag is cut into a predetermined length to obtain a finished product.

The following materials are preferable as materials for forming the layers 2, 4, 6, 8, 10, and 12.

That is, the first and second base films 2 and 12
As the material of, for example, polyester or stretched nylon, unstretched nylon, polyester or stretched nylon coated with polyvinylidene chloride, or polyester or stretched nylon or stretched polypropylene subjected to aluminum vapor deposition is preferably used. Examples of materials used for the first and second polyethylene-based resin layers 4 and 10 include low-density polyethylene, linear low-density polyethylene, ethylene-vinyl acetate copolymer, serine, ethylene-methacrylic acid copolymer. And unstretched polypropylene are preferably used. Further, as the material of the anchor coat layer 6, for example, a urethane resin, a titanium resin, an imine resin, an isocyanate resin or the like is preferably used, and as the material of the release layer 8, for example, , A varnish having a simple composition such as a polyamide resin, a cellulose resin, a urethane resin, a cyclized rubber resin, or a chlorinated polypropylene resin, or a mixture of two or more kinds of varnish having these simple compositions, A varnish having a mixed composition is preferably used. The release layer 8 can be colored in a desired color by mixing the varnish with a pigment.

Next, a second embodiment will be described with reference to FIGS.

FIGS. 7 to 9 are sectional views of the air bag according to this embodiment, similar to FIGS. 3 to 5, respectively, and FIG. 10 shows a stacking process of the air bag in sequence. It is shown later.

The air bag according to this embodiment has the same basic structure as that of the air bag according to the first embodiment. The first polyethylene resin layer 4 is eliminated and the release layer 8 is formed on the first base film 2. Is directly laminated to change the mounting position of the valve film 14, so that the peeling position between layers is different from the peeling position shown in the first embodiment. I have to. That is, as shown in FIG. 7, this air bag has a first base film 2 and
The release layer 8, the anchor coat layer 6, the second polyethylene resin layer 10, the anchor coat layer 6, and the second base film 12 are sequentially laminated. There is.

Regarding the mounting position of the valve film 14, on the other hand, as shown in FIG. 8, one ends of the films 14a and 14b are adhered to the first base film 2 and the release layer 8, respectively. Alternatively, a part of the release layer 8 may be removed so that one end of the one valve film 14b is directly bonded to the anchor coat layer 6.

When air is forced in through the air inlet 16 provided with the valve film 14, the valve film 14 opens and the air is guided to the air inlet 15. Then, due to the air pressure, as shown in FIG.
The base film 2 and the release layer 8 are peeled off at the interface, and an air chamber 18 is formed between the layers 2 and 8 as shown in FIG. Then, by further continuing to press in the air, the separation of the layers 2 and 8 extends over the entire air bag, and an air bag having an air chamber 18 having a desired pattern is formed.

Next, a method of manufacturing the air bag having the above structure will be described with reference to FIG.

First, as shown in (I) and (II), the release layer 8 is formed on the first base film 2 by gravure printing or flexographic printing.

Then, as shown in (III), an anchor coat is formed on the entire surface of the first base film 2 on which the release layer 8 is formed.
After the coating layer 6 is applied, polyethylene is extruded on the anchor coating layer 6 to form a second polyethylene resin layer 10 made of the same material as the first polyethylene resin layer. And at the same time, this second polyethylene resin layer 10
The second base film 12 provided with the anchor coat layer 6 is laminated thereon.

Next, at a predetermined position on the peripheral portion of the air bag according to this embodiment, a part of the interface between the first base film 2 and the release layer 8 in the weakly adhered state is peeled off. Then, the valve films 14a and 14b are inserted between the two layers 2 and 8, and one end portion of each of the films 14a and 14b is, as shown in FIG. Adhere to layer 8.

Then, this laminated body is completed as an air bag after the air filling operation step and the cutting operation step as in the case of the first embodiment. The materials and the film thicknesses of the layers forming the air bag according to the second embodiment are the same as the materials and the film thicknesses of the layers forming the air bag of the first embodiment.

By the way, the release layer 8 according to this embodiment is interposed between the first base film 2 and the second polyethylene resin layer 10. As a modified example thereof, the release layer 8 is provided as a second layer. Base film 12 and second polyethylene resin layer 1
And a valve similar to the pair of valve films 14a and 14b used in the first and second embodiments, is adhered to the release layer 8 and the second base film 12, respectively. Is also good.

FIGS. 11 and 12 show modifications of the valves used in the air bladders according to the first and second embodiments and the modifications, respectively.
And a modification of the air injection path.

In FIG. 11, reference numeral 24 is a conventional valve used for a floating bag or the like. As shown in the drawing, the valve 24 includes a cylindrical valve body 24c, a valve seat 24b provided on an inner surface of the body 24c, a valve seat 24b rotatably attached to the inner surface of the body 24c, and a valve seat 24b. The check valve 24a functions in cooperation with each other, and the plug 24d that can be fitted in the inner surface of the air inlet 16 of the valve body 24c.

As an alternative to the valve films 14a, 14b of the first and second embodiments and the modified example, this valve can be used by directly attaching it to the mounting positions of the valve films 14a, 14b.

On the other hand, in FIG. 12, 26 and 25 respectively indicate an air inlet and an air inlet. As shown in the figure, the air injection path 25 is formed to be elongated and meandering, so that the air injection path 2 can be inserted from the air injection port 26.
A function as a check valve is provided so that the air filled in the air chamber 18 does not flow back through the valve 5.
It should be noted that in this modified example, before the air is injected, a liquid material having a viscosity such as silicon is packed in the air injecting passage 25 in advance to better prevent the backflow of the air after the air is injected. You can

[Brief description of drawings]

FIG. 1 is an overall plan view of an air bag according to a first embodiment of the present invention.

FIG. 2 is a partially enlarged view of the air bag shown in FIG.

FIG. 3 is a cross-sectional explanatory view of a main part of the air bag shown in FIG.

FIG. 4 is an enlarged sectional view taken along line IV-IV of FIG.

5 is a state diagram showing a state in which the air bag of FIG. 3 is filled with air.

6 (I), (II), and (III) are cross-sectional views of essential parts showing a manufacturing process of the air bag shown in FIG.

FIG. 7 is an explanatory cross-sectional view of the main parts of an air bag according to a second embodiment of the present invention.

FIG. 8 is a cross-sectional explanatory view of a main part of an air bag according to a second embodiment of the present invention.

9 is a state diagram showing a state in which the air bag of FIG. 7 is filled with air.

10 (I), (II), and (III) are cross-sectional views of essential parts showing a manufacturing process of the air bag shown in FIG. 7.

FIG. 11 is an explanatory diagram showing a state in which a valve modification is applied to the air bladder according to the first and second embodiments of the present invention.

FIG. 12 is an explanatory view showing a state in which a modified example of the air injection passage is applied to the air bladder according to the first and second embodiments of the present invention.

[Explanation of symbols]

2 1st base film 4 1st polyethylene resin layer 6 anchor coat layer 8 release layer 10 2nd polyethylene resin layer 12 2nd base film 14 valve film 14a, 14b
Film 25,25 Air injection channel 16,26 Air injection port 18 Air chamber 24 Valve 24a Check valve 24b Valve seat 24c Valve body 24d Plug

Claims (2)

[Claims] 1. A release layer having a pattern corresponding to a desired air chamber pattern between a first base film (2) and a second base film (12). An air bag characterized by being bonded to each other with 8) sandwiched therebetween. 2. A release layer (1) having a pattern corresponding to a desired air chamber pattern between a first base film (2) and a second base film (12). 8) A method for producing an air bag, which is bonded to each other with the release layer interposed therebetween,
(8) is a method for manufacturing an air bag, which is formed by printing.