JP2018114958A - Hollow woven air bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hollow woven air bag that is dense and sufficiently air-tight by using a specific woven texture.SOLUTION: In a hollow woven air bag 100 comprising a bag texture serving as an expansion inflating part 1 and a woven texture serving as a closed part 2 provided adjacent to the peripheral edge of the bag texture, the bag texture uses a 1×1 plain-woven texture B as a basic texture, a woven texture A rougher than the 1×1 plain woven texture is partially introduced into at least one of one-face-side woven fabric serving as an expansion inflating part and the other-face-side woven fabric, and the rough woven texture has higher thread density. For the rough woven texture, at least one of 2×1 plain woven texture, 2×2 plain woven texture and 3×3 plain woven texture can be used. In addition, a woven texture serving as an expansion inflating part in the boundary between the bag texture serving as the expansion inflating part and the woven texture serving as the closed part is formed from only 1×1 plain woven texture (refer to a part 1a formed from 1×1 plain woven texture further on the expansion inflating part side than a border line C).SELECTED DRAWING: Figure 4

Description

  The present invention relates to a bag-woven airbag. More specifically, the present invention is based on a 1 × 1 plain weave structure, and a partially rough weave structure is introduced, and in the coarse weave structure, the yarn density is increased and densified and has sufficient airtightness. The present invention relates to a bag-woven airbag.

  Conventionally, an airbag for a vehicle includes a bag-like portion that is inflated and deployed, and a closed portion that is provided at the periphery of the bag-like portion in order to suppress gas leakage from the bag-like portion. In order to further suppress gas leakage during expansion and deployment, a coating layer made of silicone resin or the like is provided on the outer surface side. Furthermore, in order to suppress gas leakage, the bag-like portion is usually constituted by a 1 × 1 plain weave structure. In this 1 × 1 plain weave structure, the warp is crimped for every weft and becomes an extremely dense structure, so that an air bag having high airtightness can be obtained. On the other hand, since the structure is dense, it is difficult to increase the yarn density and further improve the airtightness.

  In addition, gas leakage is usually suppressed by a coating layer using a silicone resin or the like applied to the outer surface side of the airbag. At that time, if a large amount of coating agent is applied and the coating layer is thickened, the airtightness can be further improved. However, since the coating agent usually has a higher unit price than the raw yarn made of synthetic resin fibers or the like, when a large amount of the coating agent is used, it becomes a cause of the cost increase of the airbag, which is not preferable. Further, when the coating layer is thickened, the airbag becomes rigid, and it is not easy to roll or fold the airbag, and it becomes difficult to store the airbag, and the expansion and deployment performance may be deteriorated.

  There are various types of airbags for vehicles. For example, curtain shield airbags (rollover-compatible airbags and side-impact-compatible airbags) can be cited, and rollover-compatible airbags that require high airtightness have a large amount of coating agent applied. On the other hand, in a side impact compatible airbag that does not require as high airtightness as a rollover compatible airbag, the amount of coating agent applied is relatively small. In any case, as described above, since the coating agent is expensive, the application amount of the coating agent is reduced in the rollover-compatible airbag, and the partial coating only in the required portion is performed in the side collision-compatible airbag. It is preferable to reduce the cost of the bag.

  On the other hand, a bag-woven airbag that inflates and reduces the impact on the object to be protected, and is capable of controlling the internal pressure as required by the woven structure at the boundary between the bag and the closed portion. Is known (for example, see Patent Document 1). Furthermore, a bag-woven airbag having a similar bag-woven structure and having improved internal pressure maintenance performance by suppressing the opening at the boundary between the bag portion and the closed portion is also known (for example, Patent Document 2). reference.).

JP 2013-216213 A JP, 2006-20137, A

  As described in Patent Documents 1 and 2, it is known that in a bag-woven airbag, internal pressure control is performed by a woven structure, in particular, a woven structure at a boundary portion between a bag portion and a closed portion. Also, it may normally be conceived to maintain and control the internal pressure depending on the amount of coating agent applied, the location where it is applied, and the like. However, in airbags such as the bag-woven airbags described in the above-described conventional technology and Patent Documents 1 and 2, a coarse woven structure is partially introduced into a dense woven structure, and the yarn density in the coarse woven structure is increased. Thus, even if the woven fabric is densified and the coating amount of the coating agent is reduced, no attention has been paid to the fact that a bag-woven airbag having a sufficiently high airtightness can be obtained.

  The present invention has been made in view of the above-described conventional situation, and a 1 × 1 plain weave structure is a basic structure, a partially coarse woven structure is introduced, and the yarn density in the coarse woven structure is increased. An object of the present invention is to provide a bag-woven airbag that is dense and has sufficient airtightness even if the coating amount of a high-cost coating agent is reduced or partially applied.

The present invention is as follows.
1. A bag-woven airbag comprising a bag tissue that becomes an inflated and deployed portion, and a woven tissue that becomes a closed portion provided adjacent to the periphery of the bag tissue that becomes the inflated and deployed portion,
The bag structure serving as the inflated and deployed portion has a basic structure of 1 × 1 plain weave structure, and partially on at least one of the woven fabric on one side and the woven fabric on the other side serving as the inflated and deployed portion. A bag woven airbag, wherein a woven structure coarser than the 1 × 1 plain woven structure is introduced, and a yarn density is increased in the coarse woven structure.
2. 1. The coarse woven structure is at least one of 2 × 1 plain woven structure, 2 × 2 plain woven structure, and 3 × 3 plain woven structure. A bag-woven airbag as described in 1.
3. 1. The bag tissue that becomes the inflated and deployed portion at the boundary between the bag tissue that becomes the inflated and deployed portion and the woven tissue that becomes the closed portion consists of only 1 × 1 plain weave tissue. Or 2. A bag-woven airbag as described in 1.
4). When the total of the basic structure and the coarse woven structure is 100%, the coarse woven structure is 15 to 30%. To 3. The bag woven airbag according to any one of the above.
5. Compared with the case where the rough woven structure is not introduced, the coating agent applied to the outer surface side is reduced by 30% by mass at the maximum. To 4. The bag woven airbag according to any one of the above.

In the bag-woven airbag according to the present invention, the bag structure serving as the inflated and deployed portion has a 1 × 1 plain weave structure as a basic structure, a partially coarse woven structure is introduced, and additional raw yarn is driven into the coarse woven structure. The yarn density is increased.
For this reason, all of the bag tissue that becomes the inflated and expanded portion can be densified as compared with the case of a 1 × 1 plain weave structure, and even if the coating amount of the coating agent is reduced, it is dense and has sufficient airtightness. It can be set as the bag-woven airbag which has these. It is also conceivable that the strength of the woven fabric is improved by increasing the yarn density. Accordingly, the same configuration can be applied to various airbags other than curtain shield airbags that require high pressure resistance, such as far-side airbags, knee airbags, and side airbags.

Further, the coarse woven structure may be at least one of a 2 × 1 bag structure, a 2 × 2 bag structure, and a 3 × 3 structure.
In this case, depending on the number of yarns added to increase the yarn density by driving into a coarse woven structure, a bag-woven airbag having a predetermined airtightness can be easily obtained, and at the same time, the coating agent also has a predetermined airtightness. It can be set as a required coating amount for making a bag-woven airbag.
Moreover, it is preferable that the bag structure | tissue which becomes an expansion | deployment expansion | deployment part in the boundary part of the bag structure | tissue used as an expansion | deployment expansion part and the woven structure used as a closed part consists only of 1x1 plain woven structure.
The closed portion at the boundary between the inflated and deployed portion and the closed portion may open due to the gas pressure, and the possibility of opening is particularly high at a site where the gas supplied from the inflator is directly blown. Therefore, if the bag structure serving as the inflated and expanded part at the boundary part is only a dense 1 × 1 plain weave structure, the opening at the closed part can be sufficiently suppressed.
Furthermore, when the total of the basic structure and the coarse woven structure is 100%, if the coarse woven structure is 15 to 30%, the yarn density of the coarse woven structure can be sufficiently increased, Compared to the case of a 1 × 1 plain weave structure, a denser structure can be obtained, and the coating amount of the coating agent can be reduced.
Moreover, compared with the case where the rough woven structure is not introduced, the coating agent applied to the outer surface side can be reduced by 30% by mass at the maximum.
Therefore, it is possible to reduce the cost of the airbag by reducing the amount of the coating agent, which has a higher unit price than the raw yarn.

It is a typical top view of an example of a curtain shield airbag. (A) is a 1 × 1 plain weave texture of the upper cloth of the inflated and deployed portion, (b) is a 1 × 1 plain weave texture of the lower cloth of the inflated and deployed portion, and (c) is a combination of the upper cloth and the lower cloth. It is the weave organization figure seen from the side. FIG. 3 is a structure diagram of one woven fabric and / or the other woven fabric of an inflated and expanded portion in which a rough structure partially made of 2 × 1 plain weave structure is introduced into a basic structure made of 1 × 1 plain weave structure. FIG. 2 is a schematic plan view of a part of a bag-woven airbag including an inflated and deployed portion in which a rough structure partially made of 2 × 1 plain weave structure is introduced into a basic structure made of 1 × 1 plain weave structure and a closed portion; is there.

Hereinafter, the present invention will be described in detail with reference to the drawings.
The items shown here are for illustrative purposes and exemplary embodiments of the present invention, and are the most effective and easy-to-understand explanations of the principles and conceptual features of the present invention. It is stated for the purpose of providing what seems to be. In this respect, it is not intended to illustrate the structural details of the present invention beyond what is necessary for a fundamental understanding of the present invention. It will be clear to those skilled in the art how it is actually implemented.

  The bag-woven airbag 100 of the present embodiment includes a bag tissue that becomes the inflated and deployed portion 1 and a woven tissue that becomes the closed portion 2 provided adjacent to the periphery of the bag tissue that becomes the inflated and deployed portion 1. Moreover, the bag structure used as the expansion | deployment expansion | deployment part 1 makes 1x1 plain-woven structure | tissue B a basic structure (refer FIG. 2), and at least one of the woven fabric of the one surface side used as the expansion | deployment expansion | deployment part 1 and the woven fabric of the other surface side. In this woven fabric, a woven structure A that is partially coarser than the 1 × 1 plain woven structure B is partially introduced. In the coarse woven structure A, the yarn density is increased by driving additional raw yarns.

  The bag structure that becomes the inflated and expanded portion 1 has a basic structure of 1 × 1 plain weave structure B. In this 1 × 1 plain weave structure, warp yarns are crimped for each weft yarn to be woven to form a dense structure, so that the air tightness is high. It can be a woven fabric. On the other hand, since it is a dense structure, it is difficult to increase the yarn density by weaving additional raw yarns, and it is not easy to obtain a denser and airtight woven fabric. Also, in a normal 1 × 1 plain weave structure, when weaving more wefts and trying to increase the yarn density, the crossfell, which is the point where the warp and weft interweave into the fabric, moves to the heel side, It becomes impossible to weave and it becomes impossible to make a denser woven fabric.

  Therefore, in the bag-woven airbag 100 of the present embodiment, at least one of the woven fabric on the one surface side and the woven fabric on the other surface side that becomes the inflating and deploying portion 1 is partially from the 1 × 1 plain woven fabric B. A coarse woven texture A is introduced. Further, in this coarse woven structure A, additional raw yarn that could not be driven in the 1 × 1 plain woven structure B is driven in, the yarn density is increased, and the structure becomes dense. As a result, the entire surface can be made a woven fabric having a high density and sufficient airtightness as compared with a woven fabric composed of a 1 × 1 plain weave structure B, and the coating agent applied to the outer surface side is reduced. You can also.

  The weaving structure A coarser than the 1 × 1 plain weaving structure B is not particularly limited, and examples thereof include plain weaving, twill weaving, and satin weaving, but a plain weaving that is easy to weave when partially introduced is preferable. Further, examples of the plain weave structure include a 2 × 1 plain weave structure, a 2 × 2 plain weave structure, and a 3 × 3 plain weave structure. These rough woven textures A may be used alone or in combination of two or more, but usually only one of them may be used, and it is not particularly necessary to use two or more. That is, in the coarse woven structure A, since crimps are reduced, additional yarn is driven and the yarn density is increased. However, in order to efficiently weave a woven fabric having a desired yarn density, the coarse woven structure A is Only one type is required, and it is not necessary to use various kinds of coarse woven fabrics A in combination.

  Furthermore, in the bag-woven airbag 100, the closed portion 2 may open at the boundary portion C (see FIG. 4) between the inflated and deployed portion 1 and the closed portion 2 during inflation and deployment due to gas pressure. In order to suppress the leakage of gas due to the mesh opening, the bag structure on the side of the inflated / deployed portion 1 at the boundary portion C between the bag tissue serving as the inflated / deployed portion 1 and the woven structure serving as the closed portion 2 is only 1 × 1 plain weave tissue. It is preferable to consist of (refer to the belt-shaped portion of reference numeral 1a in FIG. 4). As described above, the 1 × 1 plain weave structure is dense and has high strength. Therefore, if the bag structure on the side of the boundary portion C to be the inflated and expanded portion 1 is only the 1 × 1 plain weave structure, the closed portion 2 due to gas pressure is used. Can be sufficiently suppressed.

  In addition, it is preferable to set the introduction ratio of the coarse woven structure A into the basic structure 1 × 1 plain woven structure in consideration of the denseness of the woven fabric that will be the inflated and deployed portion 1 and the required airtightness. If the introduction ratio is too small, the airtightness cannot be improved as compared with the case where the entire woven fabric is made into a 1 × 1 plain weave structure even if an additional raw yarn is driven. On the other hand, if it is excessive, it is not easy to efficiently weave, and the strength of the woven fabric may decrease. The introduction ratio of the coarse woven structure A can be 15 to 30% when the total of the basic structure and the coarse woven structure A is 100%, and is preferably 20 to 25% (the introduction ratio is (See FIG. 3 which is 20%). If the introduction ratio of the coarse woven structure A is 15 to 30%, the bag woven airbag 100 can be dense and airtight.

  In the bag-woven airbag 100, a coating layer containing a silicone resin or the like is applied to the entire outer surface side to form a coating layer. In the bag-woven airbag 100 of the present embodiment, the coarse woven structure A is introduced into the 1 × 1 plain-woven structure that is the basic structure, and the yarn density is increased in the coarse woven structure A. Therefore, the woven fabric itself becomes dense and airtightness is improved. Therefore, the coating amount of the coating agent can be reduced. How much weight can be reduced depends on the structure of the coarse woven structure A, the introduction ratio and the number of additional yarns to be driven in, etc., but at least 10% by weight, and at most 30% by weight. Can do. By reducing the amount of the coating agent having a high unit price in this way, the cost of the bag-woven airbag 100 can be reduced.

  The woven structure A coarser than the 1 × 1 plain woven structure B may be introduced into at least one of the woven cloth on the one surface side and the woven cloth on the other surface side that will be the inflated and deployed portion 1. It is preferable to be introduced into the woven fabric and the woven fabric on the other side. Moreover, the coarse woven structure A partially introduced into the woven fabric may be introduced so as to be evenly arranged in the plane direction of the woven fabric, or may be introduced so as to be unevenly distributed. Although this coarse woven structure A is arranged depending on the type of bag-woven airbag, it is usually preferable that the coarse woven structure A is introduced so as to be arranged uniformly in the plane direction of the woven cloth.

  The coarse woven structure A is uniformly arranged in the plane direction of the woven fabric as described above from the viewpoint that the inflation, deployment and the subsequent contraction of the bag woven airbag 100 are made uniform in the plane direction of the airbag. It is preferable to be introduced. For example, as shown in FIG. 4, the coarse woven structure A can be introduced into a plurality of strips that are equally spaced in the oblique direction with respect to the closed portion 2. Further, the coarse woven structure A has a predetermined shape depending on the shape of the inflated and deployed part 1 in the planar direction and the relative positional relationship between the inflated and deployed part 1 and the closed part 2 (for example, see the curtain shield airbag 100 in FIG. 1). It is preferable to arrange so that the performance of expansion, expansion and contraction is expressed.

  Further, the raw yarn that is additionally driven in the coarse weave structure A introduced into the 1 × 1 plain weave structure B may be a weft or a warp. Further, the number of raw yarns to be additionally driven has an upper limit depending on the structure of the coarse woven structure A, the performance of the loom, and the like. For example, the introduction ratio of the coarse woven structure A is the same as the basic structure. When the total with the coarse woven structure is 100%, when it is 20 to 25%, the yarn density in the weft direction can be increased by 5 to 15%, particularly 7 to 13%.

  In the bag-woven airbag 100 of the present embodiment, the inflating and deploying portion 1 (see FIGS. 1 and 4) is made of a bag tissue, and gas supplied from the gas inlet 3 from the inflator flows into the interior when the vehicle collides. As a result, the impact is applied to the occupant's head, face, chest, etc. by expanding and unfolding. The inflated / deployed portion 1 is composed of a bag structure, and a 1 × 1 plain weave structure is a basic structure.

  On the other hand, the closed portion 2 (see FIGS. 1 and 4) is provided adjacent to the peripheral edge of the inflating and deploying portion 1 so that the inflating and deploying portion 1 inflates and expands into a predetermined three-dimensional shape. 1 is a belt-like portion having a low air permeability for suppressing leakage of gas flowing into the gas. The fabric structure of the closed portion 2 is not particularly limited as long as the leakage of the gas that has flowed in can be sufficiently suppressed. The woven structure of the closed portion 2 is not particularly limited, and can be various kinds of structures such as a plain weave structure, an oblique structure, an oblique structure, a satin structure, and a bag weave structure.

  Further, the closed portion 2 may be composed of only one type of woven structure as long as gas leakage from the peripheral edge of the bag-woven airbag 100 (see FIGS. 1 and 4) can be suppressed, but the gas leakage is more sufficiently suppressed. Therefore, the closed portions 2 having different woven structures (such as 2 × 2 structures) may be arranged in the width direction even in different woven structures (for example, plain weave structures) or the same woven structures. In this case, the order in which each of the closed portions 2 having different woven fabrics and / or woven fabrics is connected is not particularly limited, but the inverted bag woven portion made of the inverted bag woven fabric at the boundary between the closed portion 2 and the inflated and expanded portion 1 May be provided.

  Furthermore, in the width direction of the closed portion 2, two or more inverted bag weave portions may be provided adjacent to each other, or two or more inverted bag weave portions may be provided via a plain weave portion or the like. When two or more inverted bag weaving portions are provided adjacent to each other, each adjacent inverted bag weaving portion is formed by one warp and weft constituting the other upper fabric, and one upper fabric is the other. It is formed by the warp and weft constituting the lower fabric. Further, the closed portion 2 may be formed only by a single weave plain weave portion or the like.

  A filament made of a synthetic resin is used for manufacturing the bag-woven airbag 100 of the present embodiment. As this filament, there are a multifilament and a monofilament. Usually, a multifilament is used. The material of the filament is not particularly limited, and filaments made of various synthetic resins can be used. Examples of the synthetic resin include polyester resins such as polyethylene terephthalate, polybutylene terephthalate, and polytrimethylene terephthalate, polyamide resins such as nylon 6 and nylon 66, polyacrylic resins, and polyolefin resins such as polypropylene. As the synthetic resin, polyester resins and polyamide resins are particularly preferable, and polyester resins are more preferable.

  The fineness of the synthetic resin filament such as a multifilament is not particularly limited, and it is preferable to use a multifilament or the like having an appropriate fineness depending on the type of the bag-woven airbag 100, the planar shape, dimensions, and the like. The fineness can be 300-700 dtex, especially 350-650 dtex. If the fineness of the multifilament or the like is 400 to 700 dtex, the closed portion 2 that will be located in the gas ejection direction, the portion adjacent to this closed portion 2 and the closed portion 2 at other positions, and the inflated and deployed portion 1 Can sufficiently suppress gas leakage. Furthermore, since it can be set as the bag-woven airbag 100 which can be easily rolled up or folded for storage, it is preferable.

  In the case of a multifilament, the number of filaments constituting the multifilament is not particularly limited, and can be set according to the fineness and the like, but is preferably 36 to 300, particularly 72 to 200.

  Further, the yarn density of the bag tissue that becomes the inflated and expanded portion 1 is not particularly limited, and can be set according to the fineness of the filament and the fineness of the filament constituting the multifilament, the number of filaments, and the like. This yarn density is the warp direction and the weft direction in any of the 1 × 1 plain weave structure which is the basic structure of the bag structure to be the inflated and deployed portion 1 and the structure in which the raw yarn is driven in addition to the coarse weave structure A. Both can be 40 to 80 lines / inch, particularly 45 to 75 lines / inch.

  In addition, in order to further suppress gas leakage as the entire bag-woven airbag 100, a coating layer is provided on the outer surface of each of the inflated and deployed portion 1 and the closed portion 2 as described above. The method of providing the coating layer is not particularly limited. For example, a resin or the like is contained on the woven fabric used for the inflating and deploying portion 1 and the closing portion 2 on the side that becomes the outer surface when the bag-woven airbag 100 is obtained. Examples thereof include a method of spraying a solution or dispersion and heating to remove the medium.

  Various resins and rubbers can be used as the resin. Examples of the resin include silicone resins, polyurethane resins, polyacrylic resins, polyamide resins, polyester resins, polyolefin resins, fluororesins, and other silicone resins, chloroprene rubbers, And various rubbers such as chlorosulfonated polyethylene rubber. These resins and the like are preferably selected according to the material of the raw yarn, and resins and the like that adhere firmly to the warp and weft are preferred. For example, when the yarn is a polyester yarn or a polyamide yarn, the resin or the like is preferably a polyurethane resin or a polyacrylic resin.

  It should be noted that the above description is for illustrative purposes only and is not to be construed as limiting the invention. Although the invention has been described with reference to exemplary embodiments, it is to be understood that the language used in the description and illustration of the invention is illustrative and exemplary rather than restrictive. As detailed herein, changes may be made in its form within the scope of the appended claims without departing from the scope or spirit of the invention. Although specific structures, materials and embodiments have been referred to in the detailed description of the invention herein, it is not intended that the invention be limited to the disclosure herein, but rather the invention will be claimed. It covers all functionally equivalent structures, methods and uses within the scope.

  The present invention can be used in the technical field of bag-woven airbags for vehicles. In particular, by introducing a coarse woven structure into a basic structure consisting of a 1 × 1 plain woven structure of a woven fabric and increasing the yarn density in the coarse woven structure, the woven fabric has a finer, sufficient airtightness, and an outer Since the coating layer provided on the surface can be made thin, the coating layer can be suitably used in the technical field of a bag-woven airbag that is easy to store and easily inflates and deploys.

  100; bag-woven airbag, 1; inflated and deployed part, 1a; basic structure (1 × 1 plain weave structure) on the side of the inflated and deployed part at the boundary between the inflated and deployed part and the closed part, 2; closed part, 3; Gas inlet, A: Coarse woven structure introduced, B: Basic structure (1 × 1 plain woven structure), C: Boundary between expanded and closed part and closed part.

Claims (5)

A bag-woven airbag comprising a bag tissue that becomes an inflated and deployed portion, and a woven tissue that becomes a closed portion provided adjacent to the periphery of the bag tissue that becomes the inflated and deployed portion,
The bag structure serving as the inflated and deployed portion has a basic structure of 1 × 1 plain weave structure, and partially on at least one of the woven fabric on one side and the woven fabric on the other side serving as the inflated and deployed portion. A bag woven airbag, wherein a woven structure coarser than the 1 × 1 plain woven structure is introduced, and a yarn density is increased in the coarse woven structure.   2. The bag-woven airbag according to claim 1, wherein the coarse woven structure is at least one of a 2 × 1 plain woven structure, a 2 × 2 plain woven structure, and a 3 × 3 plain woven structure.   The bag woven airbag according to claim 1 or 2, wherein the bag tissue serving as the inflated and deployed portion at a boundary portion between the bag tissue serving as the inflated and deployed portion and the woven tissue serving as the closed portion comprises only a 1 x 1 plain woven tissue.   The bag woven airbag according to any one of claims 1 to 3, wherein the rough woven structure is 15 to 30% when a total of the basic structure and the rough woven structure is 100%.   The bag woven air according to any one of claims 1 to 4, wherein the coating agent applied to the outer surface side is reduced by 30% by mass as compared with a case where the rough woven structure is not introduced. bag.

Images