JP2000229549A - Hollow weave air bag and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hollow weave air bag improving an internal pressure maintaining function and a manufacturing method of it. SOLUTION: A hollow weave air bag can not be reversed because of a joint part in its central part or the like. In the hollow weave air bag, respective surfaces of fibers 18 for the warp and the weft constituting the hollow weave air bag are previously covered with a coating layer forming material 20 (A). After hollow weaving with the fiber 18, the coating layer forming material 20 exposed to the inside face is melted and dried by supplying hot air (B), and consequently, a coating layer is formed on the inside face of the hollow weave air bag. Therefore, gas leakage due to peeling of the coating is not generated in comparison with a hollow weave air bag with a coating layer on the outside, so that an internal pressure maintaining function can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag-woven airbag which is woven into a bag-like shape and has a joining portion functioning as a partition at a predetermined internal position, and a method of manufacturing the same.

[0002]

2. Description of the Related Art An example of a conventional bag-woven airbag and a method of manufacturing the same will be described below with reference to FIGS. Conventionally, as shown in FIG. 15 (A), after weaving a woven fabric having a bag weave structure, a coating for ventilation is applied to both outer surfaces of the cloth 100. The shaded area is the coated area,
Hereinafter, this portion is referred to as “coat layer 102”. Next, FIG.
As shown in FIG. 5B, the cloth 100 is cut into a predetermined shape. Thereby, as shown in FIG.
A bag-woven airbag 1 comprising a bag-shaped base cloth 104 and coat layers 102 applied to both outer surfaces of the base cloth 104
06 is formed. In addition, the shape at the time of cutting is the planar development shape of the woven airbag 106.

[0003]

However, the above-mentioned conventional bag-woven airbag and the method for manufacturing the same are disadvantageous in terms of air vents, and there is room for improvement in this respect. That is, as shown in FIG. 16, in the case of the conventional bag-woven airbag and the method of manufacturing the same, since the coat layers 102 are formed on both outer surfaces of the base cloth 104, the gas from the inflator is introduced into the base cloth 104. When the internal pressure P is applied after flowing, a large tensile force acts instantaneously on the coat layer 102. For this reason, the coat layer 102 cannot completely follow the expanded shape of the base cloth 104, and the coat layer 102
May be peeled off (hereinafter, this phenomenon is referred to as “coat peeling”). If the coat layer 102 comes off,
Gas leaks from that part to the outside, and the woven airbag 10
6, the internal pressure holding function is reduced.

[0004] The present invention has been made in view of the above background, and an object of the present invention is to provide a woven airbag capable of improving the internal pressure holding function and a method of manufacturing the same.

[0005]

According to the present invention, there is provided a bag-woven airbag which is woven into a bag-like shape and has a joint functioning as a partition at a predetermined position inside the bag-woven airbag. A coat layer was formed on the inner surface of the bag,
It is characterized by:

According to a second aspect of the present invention, there is provided a method of manufacturing a bag-woven airbag having a joining portion which is woven into a bag-like shape and has a joint functioning as a partition at a predetermined position inside the bag-like airbag. The coating layer is formed on the inner surface of the woven airbag by melting and drying the coating layer forming material by blowing hot air.

According to a third aspect of the present invention, there is provided a method for manufacturing a woven airbag according to the second aspect, wherein the fibers constituting the woven airbag are coated in advance with a coating layer forming material. It is characterized by:

According to a fourth aspect of the present invention, there is provided a method for manufacturing a woven airbag according to the second aspect, wherein the adhesive is sprayed onto the inner surface of the woven airbag and a coated layer is formed in a cured state. The method is characterized in that hot air is blown after the material is sprayed on the inner surface of the woven airbag in this order or simultaneously.

According to a fifth aspect of the present invention, there is provided a method for manufacturing a woven airbag according to the second aspect of the present invention, wherein the molten coating layer forming material is sprayed onto the inner surface of the woven airbag and hot air is blown. Are performed in this order or simultaneously.

According to a sixth aspect of the present invention, there is provided a bag-woven airbag having a joint portion woven into a bag-like shape and having a joint functioning as a partition at a predetermined internal position, wherein the bag-woven airbag is multi-woven. Thus, an outer bag portion is formed outside the woven airbag, and a coat layer is formed inside the outer bag portion.

According to a seventh aspect of the present invention, there is provided a method of manufacturing a bag-woven airbag having a joining portion which is woven into a bag shape and which functions as a partition at a predetermined position in the bag. After forming the outer bag portion outside the woven airbag by weaving, a fusible coat layer forming material is arranged in the outer bag portion, and the woven airbag is hot pressed to form a coat layer forming material. Is melted to form a coat layer in the outer bag portion.

The present invention according to claim 1 is based on the premise that a bag-woven airbag which is woven into a bag-like shape and has a joining portion functioning as a partition at a predetermined internal position is applied. In the present invention, since the coat layer is formed on the inner surface of the bag-woven airbag, it is possible to prevent instantaneous large tensile force from acting on the coat layer when inflated like a conventional bag-woven airbag. Can be. For this reason, when the bag-woven airbag is inflated, the coating does not peel off, and gas leakage can be prevented.

According to the second aspect of the present invention, the bag-woven airbag is not only woven in a bag shape, but also has a joining portion functioning as a partition at a predetermined position inside. For this reason, the woven airbag cannot be turned over due to the presence of the joint, and there is an inherent difficulty in forming a coat layer on the inner surface of the woven airbag there.

[0014] In the present invention, the coating layer forming material in a cured state or a molten state is melted and dried by blowing hot air on the background of the difficulty in the above-mentioned manufacturing method.
Since the coat layer is formed on the inner surface of the bag-woven airbag, the present invention can be applied to a bag-woven airbag that cannot be turned over. In addition, by applying the method for manufacturing a woven airbag according to the present invention, a coat layer is formed on the inner surface of the woven airbag, so that peeling of the coat does not occur as described above, and gas leakage occurs. This can be prevented.

According to the third aspect of the present invention, the fibers constituting the woven airbag are coated in advance with the coating layer forming material. When a woven airbag is formed using such fibers, the coat layer forming material covering the constituent fibers is exposed on the inner surface of the woven airbag. When hot air is blown into the woven airbag in this state, the coat layer forming material exposed on the inner surface of the woven airbag is melted and dried while the inflated state of the woven airbag is maintained. Thereby, a coat layer is formed on the inner surface of the woven airbag. Therefore, when the woven airbag is inflated, the coat does not peel off,
Gas leakage can be prevented.

Further, in the case of this manufacturing method, since the step of coating the fiber with the coating layer forming material and the step of blowing hot air into the woven airbag are different steps, both steps must be managed independently. Can be. For this reason, quality control becomes easy. Therefore, a high-quality coat layer can be formed.

According to the fourth aspect of the present invention, first, the adhesive is sprayed on the inner surface of the woven airbag, and the cured coating layer forming material is sprayed on the inner surface of the woven airbag in this order. Or it is done simultaneously. This allows
An adhesive is attached to the inner surface of the woven airbag, and a cured coating layer forming material is attached to the adhesive.
Next, hot air is blown into the woven airbag. When the hot air is blown, the cured coat layer forming material is melted and dried while the inflated state of the bag-woven airbag is maintained. Thereby, a coat layer is formed on the inner surface of the woven airbag. Therefore, when the bag-woven airbag is inflated, the coating does not peel off, and gas leakage can be prevented.

In addition, in the case of this manufacturing method, since an adhesive is used, various cured layer-forming materials can be used.

According to the fifth aspect of the present invention, the coating layer forming material in a molten state is blown onto the inner surface of the woven airbag and the hot air is blown in this order or simultaneously. As a result, the molten coating layer forming material is directly adhered to the inner surface of the woven airbag, and the molten coating layer forming material is fused along with the inner surface of the woven airbag by blowing hot air. The coating layer is formed by spreading in a film shape and drying.

Further, in the case of this manufacturing method, since the coating layer forming material in a molten state is used, the use of an adhesive can be omitted.

According to the present invention described in claim 6, according to claim 1,
As in the invention described in (1), it is premised to apply a woven airbag woven into a bag shape and having a joining portion functioning as a partition at a predetermined position inside. In the present invention, by multi-weaving the bag-woven airbag,
Since the outer bag portion is formed outside the woven airbag and the coat layer is formed inside the outer bag portion, the outer bag portion has a ventilation blocking function.

The term "outer bag portion" as used herein refers to a bag-like portion formed by the outer fabric and the inner fabric of the woven airbag. "Forming a layer" means that a coat layer is formed between the outer base fabric and the inner base fabric that constitute the outer bag portion.

The present invention described in claim 7 is also a manufacturing method devised against the background of the difficulty in the manufacturing method described as the operation of claim 2 described above. That is, in the present invention, the outer bag portion is formed outside the bag-woven airbag by first multiply-weaving the bag-woven airbag. Then, a coat layer forming material that can be melted is arranged in the outer bag portion. Next, the coat layer forming material in the outer bag portion is melted by hot-pressing the bag-woven airbag. When the melted coat layer forming material dries and hardens, a coat layer is formed in the outer bag portion.

Here, the meaning of the "outer bag portion" and "the coating layer forming material is disposed in the outer bag portion".
Has the same meaning as described in the operation of the invention of claim 6.

Therefore, the method for manufacturing a woven airbag according to the present invention can be applied to an irreversible woven airbag in the same manner as in the second to fifth aspects of the present invention. . In addition, by applying the method for manufacturing a woven airbag according to the present invention, a coat layer is formed in the outer bag portion outside the woven airbag, so that the outer bag portion has a ventilation blocking function. .

Further, according to the present invention, since the coat layer forming material is separated by the inner base cloth, the inner surface of the woven airbag is different from the invention according to the second to fifth aspects. There is no concern about adhesion of the coat layer forming materials in a molten state to form a coat layer on the substrate. In other words, there is no need to maintain the inflated state of the woven airbag.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] A first embodiment of the present invention will be described below with reference to FIGS.

First, the overall structure of the woven airbag 10 according to this embodiment will be briefly described with reference to FIG.
As shown in this figure, the bag-woven airbag 10 is woven so as to have a bag shape, and is formed in a substantially rectangular shape as a whole. The peripheral portion 12 of the woven airbag 10 is closed so that gas leakage does not occur, and an inflator (not shown) is provided at the front end directly through a bracket or the like or indirectly through a tube or the like. An opening 14 for connection is formed. Further, the center portion of the woven airbag 10 has a function of increasing the deployment speed (inflation speed) by dividing the gas inflow path for inflating the woven airbag 10 into an upper edge side and a lower edge side, and inflating. A curved joint portion 16 having a function of regulating the thickness of the formed woven airbag 10 is formed. This joint 16
This is also a portion through which gas does not pass, similarly to the above-described peripheral portion 12.

The above-described bag-woven airbag 10 is folded in a bellows shape or the like in the bag height direction and stored in a predetermined portion of the vehicle. Specifically, since the woven airbag 10 according to the present embodiment is used for an airbag device for protecting the occupant's head, the body and interior materials extend from the front pillar portion to the roof side rail portion of the vehicle. (That is, between the front pillar inner panel and the front pillar garnish and between the roof side rail and the terminal portion of the roof head lining).

Here, in the present embodiment, as shown in FIG.
8 is coated with a coat layer forming material 20 which is a low melting point resin material. In addition, as the fiber 18, nylon, polyester, or the like can be applied. Further, as the coating layer forming material 20, polyethylene, low melting point polyester, polyurethane, ethylene-vinyl acetate copolymer and the like can be applied. Preferable examples include those using nylon 66 as the fiber 18 and using polyethylene resin (melting point of about 130 ° C.) as the coating layer forming material 20. In this case, the temperature of the hot air 22 is about 160 ° C.

Next, a method of manufacturing the woven airbag 10 according to the present embodiment will be described, and the operation and effects of the present embodiment will be described through the description.

First, the background of devising the woven airbag 10 and the method of manufacturing the same according to the present embodiment will be described. The bag-woven airbag 10 according to the present embodiment is not only woven into a bag shape, but also has a joint portion 16 functioning as a partition at the center. If such a joint does not exist at the center or the like, the woven airbag can be turned over from the opening for connecting the inflator. If you return to the original state again,
The coat layer can be easily formed on the inner surface of the woven airbag. However, this is not possible in the case of the woven airbag 10 of the present embodiment having the joint 16 at the center. There is inherent difficulty in forming a coat layer on the inner surface of the woven airbag 10 having such a structure.

In the present embodiment, the woven airbag 10 is manufactured as follows, against the background of the difficulty in the manufacturing method. First, the surface of the fibers 18 constituting the airbag 10 is covered in advance with a coat layer forming material 20. A cloth (not shown) woven into a bag shape is made using the fibers 18. After the cloth is cut so as to conform to the planar development shape of the woven airbag 10, hot air 22 of about 160 ° C. is blown from the opening 14 for connecting the inflator as shown in FIG. When the hot air 22 is blown into the airbag 10, the hot air 22 is discharged from the opening 14 while circulating around the joint 16 and inflating the airbag 10.

On the other hand, the inner surface of the woven airbag 10 before the hot air 22 is supplied is in a state as shown in FIG. That is, in this state, the fibers 18
The coat layer forming material (coat film) 20 on the surface is not yet melted and is in a cured state. From this state, hot air 22
Is blown into the airbag 10 as described above, since the melting point of the coat layer forming material 20 is about 130 ° C. lower than the temperature of the hot air 22, the portion of the coat layer forming material 20 in contact with the hot air 22 Is melted. Thereby, as shown in FIG. 1 (B), the coat layer forming material 20 of the fiber 18 serving as the warp and the coat layer forming material 20 of the fiber 18 serving as the weft are mutually fused. As a result, as shown in FIG.
4 are formed. The hot air 22 is supplied into the woven airbag 10 until the coat layer 24 is completely dried and maintains the inflated shape, so that the inner surfaces of the woven airbag 10 do not adhere to each other.

According to the above-described manufacturing method, the coat layer 24 can be reliably formed on the inner surface even in the case of the woven airbag 10 having a structure that cannot be turned over due to the presence of the joining portion 16 in the central portion. Can be. Further, in the case of the woven airbag 10 according to the present embodiment manufactured as described above, since the coat layer 24 is formed on the inner side surface, it acts instantaneously when the woven airbag 10 is inflated. It is not affected by a large tensile force. Therefore, in the case of the woven airbag 10 according to the present embodiment, it is possible to reliably prevent the coating layer 24 from peeling off and leaking gas.
As a result, according to the present embodiment, the woven airbag 10
The internal pressure holding function can be improved.

In the case of the method for manufacturing the woven airbag 10 according to the present embodiment, the step of previously covering the fibers 18 with the coating layer forming material 20 and the step of blowing the hot air 22 into the woven airbag 10 are performed. Because it is a heterogeneous process,
Both can be managed separately and independently. Therefore, quality control is facilitated, and a high-quality coat layer 24 can be formed. As a result, according to the method for manufacturing the woven airbag 10 according to the present embodiment, the internal pressure holding function of the woven airbag 10 can be further improved. Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIGS. Note that the same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

The bag-woven airbag 10 according to this embodiment
Is as follows. First, as shown in FIG. 4, the adhesive 26 is sprayed (sprayed) from the opening 14 onto the inner surface of the airbag 10. The bonding force of the adhesive 26 used at this time may be relatively weak, and an application example will be described later. In addition, the concept of “adhesive” described in claim 4 includes not only a literal adhesive, but also has a function corresponding to the adhesive, and is used instead of the literal adhesive. Things are also included.

Next, as shown in FIG.
The powder 28 in a powdered and cured state as a “coat layer constituent material” is sprayed onto the inner surface of the woven airbag 10. As a result, the powder 28 is uniformly adhered to the surface of the adhesive 26 already adhered to the inner surface of the airbag 10.

Thereafter, as shown in FIG.
Hot air 22 is blown into the woven airbag 10. As a result, the powder 28 adhered to the surface of the adhesive 26 is melted by the heat of the hot air 22, fused with each other, and dried to form the coat layer 24 of the first embodiment shown in FIG. You.

The adhesive 26 and the powder 28 in the above configuration include chloroprene, silicon, urethane, polyamide, polyester, polyacryl, polyolefin, fluorine, chlorosulfonated polyethylene, and ethylene-based. Various propylene copolymer materials can be used. Further, as a preferred example of the present embodiment, when nylon 66 is used as a constituent fiber of the woven airbag 10, urethane rubber is used as the adhesive 26 and polyurethane is used as the powder 28. be able to. In this case, the temperature of the hot air 22 is about 200 ° C.

According to the above manufacturing method, since the coat layer 24 is formed on the inner surface of the woven airbag 10, the same operation and effect as those of the first embodiment described above (ie, gas leakage due to peeling of the coat is prevented). Thereby, the effect of improving the internal pressure holding function of the woven airbag 10) can be obtained.

Further, in the case of the manufacturing method according to the present embodiment, since the adhesive 26 is used, the powder 28 made of various resin materials can be used as the cured coating layer forming material. As a result, according to the present embodiment, the degree of freedom in material selection can be increased.

In the present embodiment, the adhesive 26 is sprayed onto the inner surface of the airbag 10 and the airbag 1 is made of a hardened coating layer forming material (powder 28).
Although the spraying of the inner surface of No. 0 was performed in this order, the spraying of the adhesive 26 and the spraying of the powder 28 may be performed simultaneously. For example, as shown in FIG.
When performing the spraying operation, the powder 28 may be placed on the supply airflow of the adhesive 26 at a constant falling speed from above the opening 14 so as to be mixed. Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIG. Note that the same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

The bag-woven airbag 10 according to this embodiment
Is as follows. As shown in FIG. 7, in the present embodiment, the resin 30 as the “coat layer forming material” is used in a molten state. Then, the resin 30 in the molten state is sprayed together with the hot air 22 from the opening 14 onto the inner surface of the airbag 10. As a result, the resin 30 in the molten state is directly attached to the inner surface of the airbag 10 while maintaining the inflated state, and the resin 30 in the molten state is fused with the hot air 22 blown at the same time. The hot air 22 which spreads like a coating along the inner surface of the bag 10 and is continuously fed thereafter
The coating layer 24 is formed by drying.

The molten resin 30 in the above configuration is
As in the second embodiment, chloroprene, silicon, urethane, polyamide, polyester, polyacryl, polyolefin, fluorine, chlorosulfonated polyethylene, ethylene-propylene copolymer Various materials of the system are applicable. In addition, as a preferred example of the present embodiment, when nylon 66 is used as a constituent fiber of the woven airbag 10, a silicone resin can be used. In this case, the temperature of the hot air 22 is about 200 ° C.

According to the above manufacturing method, the coat layer 24 is formed on the inner surface of the woven airbag 10, so that the same operation and effect as those of the first embodiment described above (ie, gas leakage due to peeling of the coat is prevented). Thereby, the effect of improving the internal pressure holding function of the woven airbag 10) can be obtained.

In the case of the manufacturing method according to the present embodiment, since the resin 30 in a molten state is used, the use of the adhesive used in the second embodiment can be omitted. As a result, according to the present embodiment, the number of manufacturing steps can be reduced, which can contribute to cost reduction and the like.

In this embodiment, the molten resin 3
0 is blown into the woven airbag 10 together with the hot air 22. However, the present invention is not limited to this. The blowing of the molten resin into the woven airbag and the blowing of the hot air may be performed in this order. . In this case, it is desirable to blow the hot air 22 before the resin 30 in the molten state is cured. [Fourth Embodiment] Next, a fourth embodiment of the present invention will be described with reference to FIGS. Note that the same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

First, the overall structure of the woven airbag 32 according to this embodiment will be briefly described with reference to FIGS. As shown in these figures, the bag-woven airbag 32 according to the present embodiment is also woven so as to have a bag shape, and is formed in a substantially rectangular shape as a whole. It has the same configuration as the woven airbag 10 according to the embodiment.

However, the bag-woven airbag 32 according to the present embodiment differs from the above-described bag-woven airbag 10 according to the first embodiment in that the airbag 32 is formed as a quadruple fabric. That is, the bag-woven airbag 32 according to the present embodiment
In FIGS. 9 and 10, the peripheral portion 12 and the joining portion 16 of the woven airbag 32 are closed, and this portion is configured as a single woven fabric. Portions other than the peripheral portion 12 and the joining portion 16 in the woven airbag 32 are configured as a quadruple fabric. This allows
The woven airbag 32 according to the present embodiment includes an inner sack portion 34 formed of two inner base fabrics 33 and inflated by inflow of gas from an inflator; It has a structure including a pair of outer bags 36 formed by the base cloth 35. That is, the inner bag portion 34 and the outer bag portion 36 are formed in a bag shape by sharing the inner base cloth 33. These pair of outer bag portions 36
Inside, a coat layer 40 made of a paste-like or powder-like coat layer forming material 38 is uniformly formed.

The coating layer forming material 38 in the above-described configuration is exactly the same as the third embodiment described above, and is made of chloroprene, silicon, urethane, polyamide, polyester, polyacryl, polyolefin, or fluorine. Various materials such as a chlorosulfonated polyethylene type and an ethylene-propylene copolymer type are applicable. In addition, as a preferable example in the case of carrying out the present embodiment, a mode in which a silicon-based resin is used as the coating layer forming material 38 and hot pressing is performed at a hot pressing temperature of about 200 ° C.

Next, a method of manufacturing the woven airbag 32 according to the present embodiment will be described, and the operation and effects of the present embodiment will be described through the description.

First, a pair of outer bag portions 3 is provided outside the inner bag portion 34.
Cloth woven so as to form 6 (not shown)
Is made. After the cloth is cut so as to conform to the planar development shape of the woven airbag 32, the cloth is cut through the opening 14 into the pair of outer bags 36 (that is, between the outer base cloth 35 and the inner base cloth 33). A paste-like or powder-like coat layer forming material 38 is charged (filled) into the formed internal space 41). Next, pressing is performed while heating using a hot press machine 42 shown in FIG. Thereby, the coat layer forming material 38 filled in the pair of outer bag portions 36 is melted. Thereafter, the woven airbag 32 is taken out of the hot press machine 42 and the melted coating layer forming material 38 is dried by natural drying or the like, whereby the coating layer 40 is formed. During the hot pressing, the coat layer forming material 38 charged into the pair of outer bag portions 36 is separated by the inner base fabric 33 constituting the inner bag portion 34, 38 do not touch each other.

According to the manufacturing method described above, the bag is woven so that a pair of outer bags 36 are formed outside the inner bag 34.
Since the coat layer 40 is formed by filling the outer bag portion 36 with the coat layer forming material 38 and hot pressing the same, the structure cannot be turned over due to the presence of the joint portion 16 in the center portion. The present invention can also be applied to the woven airbag 32. Further, in the present embodiment, the coat layer 4 is provided in the outer bag portion 36 constituting the outside of the woven airbag 32.
Since 0 is formed, the outer bag portion 36 is provided with a ventilation blocking function. As a result, according to the present embodiment, the internal pressure holding function of the woven airbag 32 can be improved.

Further, according to the present embodiment, the bag-woven airbag 32 is formed as a quadruple woven fabric, and the pair of outer bags 36 are formed outside the inner bag 34, so that the coat layer 40 is finally formed. There is no concern about the close contact between the coating layer forming materials 38. In other words, the step of maintaining the woven airbag 32 in the inflated state becomes unnecessary.
As a result, according to the present embodiment, the woven airbag 32
Can be easily manufactured.

Furthermore, according to the present embodiment, since the manufacturing method is heating using the hot press machine 42, the quality of the coat layer 40 can be improved as compared with the manufacturing method using hot air. In other words, when hot air is used, the coat layer forming material located on the upstream side with respect to the hot air is first exposed to the hot air, and the coat layer forming material located on the downstream side is exposed to the hot air with a delay. Although there is a possibility that a slight time difference occurs in the time and melting unevenness of the coat layer forming material occurs, in the present embodiment in which the heating is performed using the hot press machine 42, the entire surface of the woven airbag 32 is heated once. Therefore, the amount of heat applied to the coat layer forming material 38 becomes uniform. Therefore, the quality of the coat layer 40 can be improved. [Fifth Embodiment] Next, a fifth embodiment of the present invention will be described with reference to FIGS. Note that the same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

First, the overall structure of the woven airbag 44 according to the present embodiment will be briefly described with reference to FIGS. FIG. 12 is a cross-sectional view (a cross-sectional view corresponding to FIG. 9 described above) of a general portion of the woven airbag 44 according to the present embodiment, and FIG. A cross-sectional view (a cross-sectional view corresponding to FIG. 10 described above) of the portion 46 is shown. As shown in these figures, the woven airbag 44 according to the fourth embodiment is different from the woven airbag 32 according to the fourth embodiment in that the woven airbag 44 according to the present embodiment is also basically configured as a quadruple woven fabric. The same is true.

However, in the bag-woven airbag 44 according to this embodiment, the peripheral portion 12 and the joining portion 46 are both closed, but the peripheral portion 12 is formed as a single woven fabric as in the fourth embodiment. Although configured, the joint 46
Is different from the fourth embodiment in that it is configured as a triple fabric. Thereby, the woven airbag 4
Similarly to the fourth embodiment, the general portion 4 (the cross-sectional portion corresponding to FIG. 9 in the fourth embodiment described above) is located outside the inner bag portion 34 formed by the two inner base fabrics 33. A structure in which a pair of outer bags 36 formed by the inner base cloth 33 and the outer base cloth 35 is formed,
Unlike the fourth embodiment, the portion where the joining portion 46 is formed (the cross-sectional portion corresponding to FIG. 10 in the fourth embodiment) has the same structure as the general portion.
That is, the portion where the joint 46 is formed is also formed by the inner base cloth 33 and the outer base cloth 35 outside the inner bag part 34 formed by the two inner base cloths 33. A pair of outer bag portions 48 are formed. The pair of outer bags 48 newly formed in the present embodiment are mutually communicated with the inner space 41 of the outer bag 36 in the general portion, and form an inner space 50 that is continuous in the bag height direction. Things.

In the outer bag portions 36 and 48 of the woven airbag 44 before the hot pressing step described later, a flexible film-like resin member 5 as a “coat layer forming material” is provided.
2 are inserted and arranged. The resin member 52 may be made of the same material as that of the third embodiment, such as chloroprene, silicon, urethane, polyamide, polyester, polyacryl, polyolefin, fluorine, and chlorosulfonated polyethylene. It is possible to apply various materials such as ethylene-propylene and ethylene-propylene copolymers into a film. As a preferred example of the resin member 52 in the form of a film, a mode in which a silicon-based resin is used and hot pressing is performed at a hot pressing temperature of about 200 ° C. can be mentioned.

According to the above configuration, first, a multiple-woven cloth (not shown) is formed so that a pair of outer bags 36 and 48 are formed outside the inner bag 34. After the cloth is cut so as to conform to the planar development shape of the bag-woven airbag 44, the cloth is cut through the opening 14 into the pair of outer bags 36, 48 (that is, the outer cloth 35 and the inner cloth 33 between the outer cloth 35 and the inner cloth 33). The film-shaped resin member 52 is inserted into the internal spaces 41, 50) formed between them. In addition, since the resin member 52 has flexibility, if it is rounded as necessary, the insertability from the opening 14 is not hindered. Next, pressing is performed while heating using a hot press machine as in the above-described fourth embodiment.
Thereby, the resin member 52 inserted into the pair of outer bag portions 36 and 48 is melted. The melted resin member 52 is
The entire surface area of at least one of the inner side surface of the outer base cloth 35 and the outer side surface of the inner base cloth 33 constituting the outer bag portions 36 and 48 is impregnated. Thereafter, the bag-woven airbag 44 is taken out of the hot press, and the melted resin member 52 is dried by natural drying or the like, whereby a coat layer equivalent to the coat layer 40 shown in the above-described fourth embodiment is formed. Is done. During the hot pressing, the resin members 52 in the molten state are separated by the inner base cloth 33 constituting the inner bag portion 34, so that the resin members 52 in the molten state do not touch each other. .

The same operation and effect as those of the fourth embodiment can be obtained by the above-described manufacturing method. That is, in the present embodiment, the bag-woven airbag 44 is formed as a quadruple woven fabric and the joint 46 is formed as a triple woven fabric. A space 50 can be formed. Thereby, the insertion of the film-shaped resin member 52 becomes possible. And finally, the woven airbag 44
Film-like resin member 5 inside outer bag portions 36 and 48 outside
Since the coat layer formed by melting the outer bag portions 2 is formed, the outer bag portions 36 and 48 have a ventilation blocking function. As a result, according to the present embodiment, the internal pressure holding function of the woven airbag 44 can be improved.

A pair of outer bag portions 3 is provided outside the inner bag portion 34.
Since 6 and 48 are formed, there is no concern about the molten resin members 52 being in close contact with each other. In other words, the step of maintaining the woven airbag 44 in the inflated state is not required. As a result, according to this embodiment, the manufacture of the woven airbag 44 can be facilitated.

Further, according to the present embodiment, since the manufacturing method is heating using a hot press machine, as compared with the manufacturing method using hot air as described in the fourth embodiment, the coating method is used. The quality of the layer can be improved.

In addition, in the present embodiment, as described above,
Since it becomes possible to use the resin member 52 in the form of a film, the resin member 52 can be operably connected to the outer bag portions 36 and 48.
Simply by inserting it inside, it is possible to shift to the hot pressing process. For this reason, the workability can be improved, and from this point, the production of the woven airbag 44 can be facilitated.

Further, by using the resin member 52 in the form of a film, the outer bag portion 36 of the woven airbag 44,
The amount of resin impregnated in the base fabric 48 can be kept constant. Therefore, the thickness of the coat layer can be made uniform, and the quality of the coat layer can be improved from this point as well.

In the present embodiment, the inner bag portion 34 of the woven airbag 44 is formed as a quadruple woven fabric.
, The inner bag portion 34 and the woven airbag 4
4 may be configured as a triple fabric at the connection end with the peripheral portion 12. Thus, the inner bag portion 34 and the peripheral portion 12
In the case where the connection end of the resin member 52 is formed as a triple fabric, there is an advantage that the insertability of the resin member 52 can be further improved.

In each of the above embodiments, the woven airbags 10, 32, and 44 applied to the airbag device for protecting the occupant's head have been described as an example. The invention is not limited to this, and any bag-woven airbag that cannot be turned over (can not be inverted) due to the presence of the joint portions 16 and 46 can be applied. For example, when a predetermined high load is applied to the side of the vehicle, a so-called side air that is swelled from the side of the seat back of the vehicle seat toward the front of the vehicle and interposed between the side door and the body of the occupant. The present invention may be applied to a woven airbag of a bag device, and in this case, the same operation and effect can be obtained.

[0068]

According to the bag-woven airbag according to the first aspect of the present invention, since the coat layer is formed on the inner surface of the bag-woven airbag, it is possible to prevent the peeling of the coat when the bag-woven airbag is inflated. As a result, there is an excellent effect that the internal pressure holding function of the woven airbag can be improved.

According to a second aspect of the present invention, there is provided a method for manufacturing a woven airbag according to the present invention, wherein the coating layer forming material in a cured state or a molten state is melted and dried by blowing hot air into the inner surface of the woven airbag. Since a coat layer is formed on the airbag, it can be applied to a nonwoven bag airbag that cannot be turned over, and if it is applied, the coating will not peel off when the airbag is inflated. As a result, there is an excellent effect that the internal pressure holding function of the woven airbag can be improved.

According to a third aspect of the present invention, in the method for manufacturing a woven airbag according to the second aspect, the fibers constituting the woven airbag are coated in advance with a material for forming a coat layer. Therefore, the quality control can be facilitated, and as a result, there is an excellent effect that the internal pressure holding function of the woven airbag can be further improved.

According to a fourth aspect of the present invention, there is provided a method for manufacturing a woven airbag according to the second aspect of the present invention, wherein the adhesive is sprayed onto the inner surface of the woven airbag and a cured coat layer is formed. After the material is sprayed on the inner surface of the woven airbag in this order or at the same time, hot air is blown, so that various hardened coating layer forming materials can be used. This has an excellent effect that the degree of freedom in selecting a forming material can be increased.

In a fifth aspect of the present invention, there is provided a method for manufacturing a woven airbag according to the second aspect, wherein the molten coating layer forming material is sprayed on the inner surface of the woven airbag and hot air is blown. Since it was decided to perform the blowing in this order or at the same time, the use of the adhesive can be omitted,
As a result, there is an excellent effect that the number of manufacturing steps of the airbag can be reduced.

In the bag-woven airbag according to the present invention, the outer bag portion is formed on the outer side of the bag-woven airbag by multi-weaving the bag-woven airbag, and a coat layer is formed in the outer bag portion. Is formed, a ventilation blocking function is imparted to the outer bag portion, and as a result, there is an excellent effect that the internal pressure holding function of the woven airbag can be improved.

According to a seventh aspect of the present invention, in the method for manufacturing a woven airbag, the outer bag portion is formed on the outside of the woven airbag by multiply woven the woven airbag, and then the outer bag is formed. A fusible coat layer forming material is arranged in the outer bag portion, and the woven airbag is hot-pressed to melt the coat layer forming material to form a coat layer in the outer bag portion. A ventilation blocking function is imparted to the coating layer, and there is no concern that the coat layer constituent materials in the molten state adhere to each other.As a result, the internal pressure holding function of the woven airbag can be improved,
It has an excellent effect of facilitating the manufacture of a woven airbag.

[Brief description of the drawings]

FIG. 1A is an essential part of a bag-woven airbag according to the first embodiment (the fiber surface is covered with a coating layer forming material).
(B) is a schematic diagram showing a state in which a coat layer forming material is melted by hot air to form a coat layer.

FIG. 2 is a front view of the woven airbag according to the first embodiment.

FIG. 3 is a sectional view taken along line 3-3 of the woven airbag shown in FIG. 2;

FIG. 4 is a manufacturing process diagram showing a first step (adhesive spraying step) in the method for manufacturing a woven airbag according to the second embodiment.

FIG. 5 is a manufacturing step diagram showing a second step (powder spraying step) in the method for manufacturing a woven airbag according to the second embodiment.

FIG. 6 is a manufacturing step diagram showing a third step (hot air blowing step) in the method for manufacturing a woven airbag according to the second embodiment.

FIG. 7 is an explanatory view showing a method for manufacturing a woven airbag according to a third embodiment.

FIG. 8 is a front view of a woven airbag according to a fourth embodiment.

FIG. 9 is a sectional view taken along line 9-9 of the woven airbag shown in FIG. 8;

FIG. 10-1 of the woven airbag shown in FIG. 8;
It is a sectional view taken along the line 0.

FIG. 11 is a manufacturing process diagram showing a hot pressing process in the method for manufacturing a woven airbag according to the fourth embodiment.

FIG. 12 is a cross-sectional view corresponding to FIG. 9 and illustrating a structure of a general portion of a woven airbag according to a fifth embodiment.

FIG. 13 is a cross-sectional view corresponding to FIG. 10 and showing a structure of a joint portion of a woven airbag according to a fifth embodiment.

FIG. 14 is an enlarged sectional view of a main part showing an improved example of the woven airbag shown in FIGS. 12 and 13.

15A and 15B are manufacturing process diagrams showing a manufacturing method of a bag-woven airbag according to a conventional example, in which FIG. 15A is a perspective view of a piece, and FIG.
1 is a perspective view of a cut-off woven airbag.

FIG. 16 is a longitudinal sectional view for explaining a problem of the conventional bag-woven airbag.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 bag woven airbag 16 joint 18 fiber 20 coat layer forming material 22 hot air 24 coat layer 28 powder (coat layer forming material) 30 resin (coat layer forming material) 32 bag woven airbag 36 outer bag portion 38 coat layer forming material Reference Signs List 40 coating layer 42 heat press machine 44 bag weaving airbag 46 joining part 48 outer bag part 52 resin member (coat layer forming material)

Claims (7)

[Claims] 1. A bag-woven airbag which is woven into a bag-like shape and has a joining portion functioning as a partition at a predetermined internal position, wherein a coat layer is formed on an inner surface of the bag-woven airbag. Characteristic bag-woven airbag. 2. A method for manufacturing a bag-woven airbag having a joint portion woven into a bag-like shape and having a joining portion functioning as a partition at a predetermined position inside, wherein a coating layer forming material in a cured state or a molten state is heated with hot air. A method for producing a woven airbag, comprising forming a coat layer on the inner surface of the woven airbag by melting and drying by blowing. 3. The method for producing a woven airbag according to claim 2, wherein fibers constituting the woven airbag are coated in advance with a material for forming a coat layer. 4. After blowing the adhesive on the inner surface of the woven airbag and the hardened coating layer forming material on the inner surface of the woven airbag in this order or simultaneously, blow hot air. The method for producing a woven airbag according to claim 2, wherein: 5. The bag-woven airbag according to claim 2, wherein the molten coating layer forming material is blown onto the inner surface of the bag-woven airbag and the hot air is blown in this order or simultaneously. Production method. 6. A bag-woven airbag having a joining portion woven into a bag-like shape and having a joint functioning as a partition at a predetermined position inside the bag-woven airbag. An outer bag portion is formed outside, and a coat layer is formed inside the outer bag portion. 7. A method for producing a bag-woven airbag having a joint portion woven into a bag shape and functioning as a partition at a predetermined internal position, wherein the bag-woven airbag is woven in multiple layers. After the outer bag portion is formed outside the airbag, a fusible coat layer forming material is arranged in the outer bag portion, and the woven airbag is hot pressed to melt the coat layer forming material. A method for manufacturing a woven airbag, comprising: forming a coat layer in a bag portion.