JP4096299B2 - Bag-woven airbag base fabric and bag-woven airbag using the same - Google Patents

Description

【００３７】
比較例１及び３で採用した組織図（図４−５）は上述の通り製織前の隣合う２本の緯糸で上布又は下布を形成するものである。そのため比較例１及び３のエアバッグの経糸方向の境界部では袋部で平織を構成していない図１２下１経糸に緯糸２本分（図１２上１，２緯糸）の浮きが生じ、緯方向の境界部では、袋部で平織を構成していない図１２下３，４緯糸が存在するため、図１２上４経糸部で緯糸２本分の浮きが生じる。糸浮きが糸ズレの起こるスペースを作るため、目開き量が大きくなる。実際には、糸ズレから派生するエア漏れが起こり、通気度も上昇してバッグからのエア漏れ量が大きくなり、バッグ内圧保持値も低くなる。
【００３８】
更に、比較例２で採用した組織図（図４の組織図７３）は上述の通り製織前の隣合う２本の緯糸で上布又は下布を形成するのみならず、経糸についても製織前の隣合う２本の経糸で上布又は下布を形成するものである。従って、比較例２のエアバッグでは経方向の境界部と緯方向の境界部の両方で糸２本分の糸ズレを起こすので（図１３（ａ）及び（ｂ））、比較例１及び３のエアバッグと比較して境界部全体の目ズレの大きさが増大し、目開き量は表１に示す通り平均的に増加する。従って、通気度及びバッグからのエア漏れ量もかなり大きく、バッグ内圧保持値は極めて低い。
【００３９】
これに対し、実施例１，３で採用した組織図（図３−１）や実施例２で採用した組織図（図３−１０）は上述の通り製織前の経糸、緯糸のいずれについても１本ずつ交互に上布と下布を形成するものである。境界部と接する袋部分は、経方向、緯方向共に袋部の上布又は下布として平織組織を構成しており、織糸は経緯相互に拘束され、２本以上の糸浮きが発生しない。そのため、境界部での糸ズレが最小限に抑えられ、目開きからのエア漏れ及び通気度は低減され、バッグ内圧保持値は極めて高い。
【００４０】
また、実施例３のエアバッグは実施例１及び２のエアバッグと比較して織密度が若干低いため、実施例１及び２のエアバッグと同じ糸１本分の糸ズレでも、ズレ量が多少大きくなり、目開き量、通気度、バッグからのエア漏れ量も幾分か上昇しているが、バッグ内圧保持値は８５と依然と高く、問題になるほどの悪さではない。
【００４１】
【発明の効果】
本発明の袋織エアバッグ基布及びエアバッグは、上布及び下布を共に平織にて形成する袋織物の２重織組織において、製織前の隣合う経糸及び製織前の隣合う緯糸で上布又は下布を形成しないように２重織組織が規定されているため、エアバッグ展開時の接結１重部との境界部における糸の動きを糸１本分に抑え、最小限の糸ズレ発生に抑えることができる。従って、本発明によればエアバッグ展開時の境界部での目ズレを低減し、目ズレからのエア漏れを防ぐことができ、最終的にはバッグの内圧保持性能が向上した側面保護に好適な袋織エアバッグを提供することができる。
【図面の簡単な説明】
【図１】実施例で使用した袋織エアバッグの模式図である。
【図２】２重織組織の経糸及び緯糸における製織前番号説明図である。
【図３】本発明の袋織エアバッグ基布の製織において採用することができる２重織の組織図の一欄である。
【図４】本発明の袋織エアバッグ基布の製織において採用することができない２重織の組織図の一欄である。
【図５】エアバッグ作動時に袋体として膨張しない部分（接結一重部）の織組織の一例である。
【図６】実施例で用いた境界部織組織である。
【図７】図４の組織図５の詳細である。
【図８】図４の組織図７３の詳細である。
【図９】図３の組織図１の詳細である。
【図１０】実施例１及び３のエアバッグの図１−ａ部の境界部及びそれに続く２重袋部の組織図例（図１０（ａ））及び同じエアバッグの図１−ｂ部の境界部及びそれに続く２重袋部の組織図例（図１０（ｂ））を示す。
【図１１】実施例２のエアバッグの図１−ａ部の境界部及びそれに続く２重袋部の組織図例（図１１（ａ））及び同じエアバッグの図１−ｂ部の境界部及びそれに続く２重袋部の組織図例（図１１（ｂ））を示す。
【図１２】比較例１及び３のエアバッグの図１−ａ部の境界部及びそれに続く２重袋部の組織図例（図１２（ａ））及び同じエアバッグの図１−ｂ部の境界部及びそれに続く２重袋部の組織図例（図１２（ｂ））を示す。
【図１３】比較例２のエアバッグの図１−ａ部の境界部及びそれに続く２重袋部の組織図例（図１３（ａ））及び同じエアバッグの図１−ｂ部の境界部及びそれに続く２重袋部の組織図例（図１３（ｂ））を示す。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an airbag as one of safety devices for automobiles. In particular, the present invention relates to a side-protection bag-woven airbag base fabric with improved internal pressure holding performance and a bag-woven airbag using the same.
[0002]
Conventionally, there are mainly two types of airbags: driver and passenger airbags for protecting passengers in the event of a frontal collision, and side protection airbags for responding to side collisions. ing.
[0003]
Of these, side-protection airbags are often assumed to be used for automobile rollover, and unlike passenger and passenger airbags, the passenger's head is protected during vehicle rollover. It is said that it is necessary to secure the internal pressure holding time from several seconds to about 10 seconds after deployment so as to be possible. Therefore, it is necessary to sufficiently prevent gas leakage from the woven fabric body, and in a sewing product, there is air leakage from the seam, which is not practical. At present, it is used as a surface coating on a bag-woven airbag base fabric. However, even in the case of a bag-woven airbag coated on the surface in this manner, air leaks from the misalignment between the connecting single portion (binding portion) and the bag portion when the airbag is deployed. The internal pressure holding performance that can withstand overload cannot be satisfied.
[0004]
[Problems to be solved by the invention]
The present invention was devised in view of the current state of the prior art, and its purpose is to solve the problem related to air leakage from the boundary between the bag portion and the connecting single portion and improve the internal pressure holding performance. An object is to provide an airbag base fabric and an airbag.
[0005]
[Means for Solving the Problems]
In order to achieve the above-mentioned problem, the present inventor has conducted intensive studies on the movement of the yarn at the boundary between the bag portion and the connecting single portion when the airbag is deployed. As a result, the adjacent warp yarn before weaving and the adjacent yarn before weaving It has been found that it is sufficient to define a double woven structure so as not to form an upper cloth or a lower cloth with wefts, and finally the present invention has been completed.
[0006]
That is, the present invention is a double woven structure of a bag woven fabric in which both an upper cloth and a lower cloth are formed by plain weaving.
Forming a top fabric by combining warp 1-3 before weaving 1-3 weft 1-3, and forming a bottom fabric by combining warp 2-4 weft 2-4 before weaving;
Forming a top fabric by combining warp 2-4 before weaving 2-4 weft 2-4 and forming a bottom fabric by combining warp 1-3 weft 1-3 before weaving;
An upper cloth is formed by a combination of warp 1-3 and weft 2-4 before weaving, and a lower cloth is formed by a combination of warp 2-4 weft 1-3 before weaving, or warp 2 before weaving A bag-woven airbag base fabric in which an upper fabric is formed by a combination of -4 wefts 1-3 and a lower fabric is formed by a combination of warp 1-3 wefts 2-4 before weaving.
[0007]
Furthermore, according to the present invention, there is provided a side-protection bag-woven airbag characterized by using such a bag-woven airbag base fabric.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The raw yarn constituting the bag-woven airbag base fabric of the present invention is not particularly limited, but for example, an aromatic polyamide fiber such as nylon 66, nylon 6, nylon 46, nylon 12 or the like, an aroma such as aramid fiber. Homopolyesters such as group polyamide fiber, polyethylene terephthalate and polybutylene terephthalate are used. Other examples include wholly aromatic polyesters, ultrahigh molecular weight polyethylene fibers, PPS fibers, and polyether ketone fibers. However, in consideration of economy, it is particularly preferable to use polyester fiber or polyamide fiber (nylon 66, nylon 6, nylon 46). Moreover, these synthetic fibers can contain various additives in order to improve process passability in the raw yarn manufacturing process and the post-processing process. Such additives include antioxidants, heat stabilizers, smoothing agents, antistatic agents, thickeners, flame retardants and the like.
[0009]
There is no particular limitation on the loom used when weaving the bag-woven airbag base fabric of the present invention, and for example, a water jet room, an air jet room, a rapier room, a projector room, and the like are used. However, the water jet loom and the air jet loom are particularly preferable in consideration of woven productivity, damage to the warp, yarn stains, and the like.
[0010]
When determining the bag weave pattern of the bag weave airbag base fabric of the present invention, a jacquard device or a dobby device can be used. In particular, in order to obtain a complicated pattern, a jacquard device (electronic or mechanical) is required, and an electronic jacquard device is preferable from the viewpoint of productivity and ease of pattern change.
[0011]
It is preferable to apply a coating agent to the bag-woven airbag base fabric of the present invention in order to prevent a decrease in air permeability and misalignment. The coating agent used for this purpose is not particularly limited, and conventionally known resins such as chloroprene, chlorosulfonated olefin, silicone, urethane and acrylic can be used. In addition, as a method for applying the coating agent, these resins are directly applied to the bag-woven airbag base fabric of the present invention, or these resins are formed into a sheet shape and the resin sheet is bonded or bonded via an adhesive. A method of laminating the bag-woven airbag base fabric of the present invention as it is without using an agent is mentioned. In addition, the bag-woven airbag base fabric of the present invention can be a non-coated base fabric without applying a coating agent as long as it satisfies the performance as an airbag. In addition, a non-coated base fabric that has been subjected to post-resin processing such as dipping can be used as the bag-woven airbag base fabric of the present invention.
[0012]
Hereinafter, preferred examples of the bag-woven airbag base fabric of the present invention will be described in detail with reference to the accompanying drawings.
[0013]
FIG. 1 is a schematic view of a bag-woven airbag manufactured in the example. In order to omit factors such as shape, the inflator mounting port and the complicated shape of the bag were not taken in, and the drawing was simplified. In the figure, 1 is a bag weaving part (double weaving part), 2 is a boundary part (B part) between the bag weaving part and A part, and 3 is a part (A part) which does not expand as a bag body when the airbag is activated.
[0014]
FIG. 2 is an explanatory diagram of warp and weft numbers in a double woven structure before weaving. This number is for explanation, and this warp number and weft number will be used for explanation of the double weave structure regardless of whether or not it is used in the present invention. The warp numbers are assigned from left to right, and the weft numbers are assigned from bottom to top. In addition, since the double woven structure of the bag woven airbag base fabric of the present invention forms both the upper cloth and the lower cloth by plain weave, the woven structure is represented by a structure chart having a minimum unit of 4 squares × 4 squares.
[0015]
FIG. 3 is a column of a structure diagram of a double weave that can be used in weaving a bag-woven airbag base fabric according to the present invention. That is, among the organization charts 1-16 in FIG. 3, eight of the organization charts 9-16 are (i) a combination of warp 1-3 and weft 1-3 before weaving to form an upper fabric, and before weaving A lower fabric is formed by combining warp 2-4 and weft 2-4, or (ii) warp 2-4 before weaving, and an upper fabric is formed by combining weft 2-4, and warp 1 before weaving. -3 corresponds to a combination of wefts 1-3 forming a lower cloth. 8 in the organization chart 1-8 are (iii) a combination of warp 1-3 and weft 2-4 before weaving, and a combination of warp 2-4 weft 1-3 before weaving. Or (iv) an upper cloth is formed by combining warp 2-4 wefts 1-3 before weaving, and a combination of warp 1-3 wefts 2-4 before weaving. Corresponds to what forms a fabric. In addition, even if there is no display in FIG. 3, organization charts obtained by reversing and / or rotating up and down, left and right, and / or black and white of the weave organization chart of FIG. 3 can be regarded as the same organization chart.
[0016]
FIG. 4 is a column of a structure diagram of a double weave that cannot be used in weaving a bag-woven airbag base fabric of the present invention. For example, in the structural diagram 5 of FIG. 4, an upper fabric is formed by combining warp 1-3 and weft 3-4 before weaving, and a lower fabric is formed by combining warp 2-4 weft 1-2 before weaving. Or a combination of warp yarns 2-4 before weaving and a combination of weft yarns 1-2, and a combination of warp yarns 1-3 before weaving and a combination of weft yarns 3-4 forming a lower cloth. . 4 is a combination of warp 1-2 and weft 1-2 before weaving to form an upper fabric, and a combination of warp 3-4 and weft 3-4 before weaving to form a lower fabric. Or a combination of warp 3-4 and weft 3-4 before weaving, and a combination of warp 1-2 and weft 1-2 before weaving. . In addition, even if there is no display in FIG. 4, organization charts obtained by reversing and / or rotating up and down, left and right, and / or black and white of the weaving organization chart of FIG. 4 can be regarded as the same organization chart.
[0017]
FIG. 5 is an example of a woven structure of a portion (A part, FIGS. 1-3) that does not expand as a bag body when the airbag is activated (3 × 3 basket woven structure). Even if it is a structure | tissue other than this, if it is a structure | tissue which can be comprised as a textile fabric, there will be no problem in particular. However, in consideration of the process of assembling the automobile member and the airbag, it is preferable to avoid a sweet woven structure in which yarn loosening occurs, for example, a woven structure having a low restraint of 20 × 20 basket weave or more.
[0018]
In order to quantify the degree of reduction in the amount of air leakage at the boundary between the bag portion and the connected single portion, a plain weave structure was used for the boundary portion of the bag manufactured in the example. FIG. 6 is a plain weave organization chart.
[0019]
Next, the mechanism of the present invention will be described. FIG. 7 shows the structure diagram 5 of FIG. 4 that cannot be used in the present invention. A combination of warp 1-3 and weft 3-4 before weaving forms a lower fabric and warp 2-4 weft 1 before weaving. In the case of forming an upper fabric with a combination of -2, warp and weft forming the upper fabric are labeled with "upper", and warps and weft forming the lower fabric are labeled with "lower". . As can be seen from FIG. 7, in this organization chart, an upper cloth or a lower cloth is formed by two adjacent wefts before weaving. Therefore, when this organization chart is employed, two adjacent wefts are alternately distributed to the upper fabric side and the lower fabric side at the time of transition from the boundary portion in the weft direction to the bag weave portion in the weaving process. This is related to the movement of the thread at the boundary in the weft direction when the airbag is next deployed. That is, when an airbag employing this organization chart is deployed, two adjacent wefts distributed alternately on the upper fabric side and the lower fabric side at the boundary in the weft direction move in the same way, A gap of two yarns is caused at the boundary portion, and the amount of gap and opening of the boundary portion in the weft direction is increased. Therefore, a large amount of air leaks from the misalignment / opening, and the internal pressure holding performance of the airbag is lowered.
Similarly, in the case of the organization chart 73 in FIG. 4 that cannot be employed in the present invention, as shown in FIG. 8, not only the upper fabric or the lower fabric is formed by two adjacent wefts before weaving, but also warps are woven. An upper cloth or a lower cloth is formed by two adjacent warps. Accordingly, when the airbag employing this organization chart is deployed, the two yarns are displaced at both the warp and boundary sections, so the airbag employing the organization chart 5 of FIG. In comparison, the size of the misalignment of the entire boundary portion increases, and the amount of opening increases on average. Therefore, the internal pressure holding performance of the airbag is further lower than that of the airbag employing the organization chart 5 of FIG.
[0020]
On the other hand, in the case of the structure chart 1 in FIG. 3 which is one of the double weave structure charts that can be employed in the present invention, one warp and one weft before weaving as shown in FIG. An upper cloth and a lower cloth are alternately formed. Therefore, when this organization chart is adopted, warp yarns are alternately distributed to the upper fabric side and the lower fabric side one by one at the time of transition from the boundary portion in the warp direction to the bag weave portion in the weaving process. When shifting to, the wefts are alternately distributed one by one to the upper fabric side and the lower fabric side. Therefore, when an airbag adopting this organization chart is deployed, only one yarn displacement occurs at both the warp and boundary portions, and the boundary misalignment and opening amount are reduced. Can be kept to a minimum. As a result, it is possible to minimize the air leakage from the misalignment / opening and greatly improve the internal pressure holding performance of the airbag.
[0021]
【Example】
The following examples further illustrate the present invention. Performance evaluation in the following examples and comparative examples was performed and displayed by the following method.
[0022]
Opening amount: The opening amount was measured according to JIS-L1096-8.21.1. That is, a sample including the boundary portion (FIG. 1-2) between the bag portion (FIG. 1-1) and the connecting single portion (FIG. 1-3) is cut out and pulled with a tensile tester under the following conditions. Measure the opening amount.
[0023]
1) A sample is cut out (dotted lines a and b in FIG. 1) so that the boundary (FIG. 1-2) can be set to a width of 3 cm and a length between chucks of 15 cm so that the boundary (FIG. 1-2) is perpendicular to the tensile direction. 1-2) is set to be the center in the length direction between chucks.
[0024]
2) Using a tensile tester, stop the tension at a tension speed of 500 mm / min and a load of 294 N, and measure the distance between the ends of the part where the texture is maximized using a caliper and a measure in the sample tension state. To do.
[0025]
3) Measure the warp direction and the weft direction 5 times each, and use the average value of 10 times as the aperture value.
[0026]
Air permeability: Using a high-pressure air permeability meter, the differential pressure applied to the sample cloth (non-coated cloth) is 50 kPa, and the flow rate (unit: 1 / cm / min) from the boundary of the sample cloth under the differential pressure of 50 kPa is measured. . Since the measurement surface is a circle having a diameter of 10 cm, the sample cloth is cut into 15 cm in the vertical direction and 7.5 cm in the horizontal direction (only in the bag portion) when the direction in which the connection single part B is present is vertical (see FIG. 1). The bag part is opened around the dotted lines c and d) and the single connection part (part 1-2 in FIG. 1-2), and the sample cloth is placed on the measurement surface. Thereafter, the boundary air permeability (unit: 1 / cm / min) is measured and calculated by the method described below.
[0027]
1) Using a high-pressure air permeability measuring device, the sample cloth opens around the boundary, the differential pressure applied to the open surface is 50 kPa, and the flow rate from the sample cloth under the differential pressure of 50 kPa (1) (1 / min ).
2) Measure the boundary length B (cm) of the sample cloth measurement surface.
3) Using one bag part as a sample, the flow rate {circle around (2)} (1 / min) from one bag part under a 50 kPa differential pressure is measured. The boundary air permeability is calculated using the following formula.
(Flow rate (1) -Flow rate (2)) / B = Air permeability at the boundary (1 / cm / min)
Further, the value is measured five times at the warp boundary and / or the weft boundary, and the average value is defined as the boundary permeability value.
[0028]
Air leakage amount: Air was fed from a compressor into a bag-woven airbag after coating, and the air leakage amount (l / sec) of Example 1 at the time when the bag internal pressure was 70 kPa was set to 100, and a relative value evaluation was performed.
[0029]
Bag internal pressure retention value: Air is fed into the bag-woven airbag after coating from the compressor, and the air feeding is stopped when the bag internal pressure reaches 70 kPa. The relative pressure was evaluated by setting the bag internal pressure 3 seconds after the air stop of Example 1 to 100.
[0030]
Example 1
Using nylon 66 filament yarn of 350 dtex / 108f for the warp and weft, plain weaving using air jet loom and electronic jacquard device, Fig. 1-1 part is processed with double bag part, warp 60 / 2.54cm, After weaving using the woven structure of Fig. 3-1, the weaving density was passed through a boiling water shrinking process so as to obtain a weaving density of 60 wefts / 2.54 cm. The woven structure of FIG. 3-1 was used for the bag portion of this sample, and two rows of the plain woven structure shown in FIG. 6 were inserted into the boundary portion of FIG. FIGS. 10A and 10B show examples of the organization chart of the boundary portion of FIGS. 1A and 1B and the double bag portion that follows the boundary portion of FIGS. The performance evaluation of this sample is shown in Table 1.
[0031]
Example 2
Using nylon 66 filament yarn of 350 dtex / 108f for the warp and weft, plain weaving using air jet loom and electronic jacquard device, Fig. 1-1 part is processed with double bag part, warp 60 / 2.54cm, After weaving using the woven structure of FIG. 3-10 so that the weaving density is 60 wefts / 2.54 cm, it is passed through a boiling water shrinking process, followed by drying and a setting process to produce a work process. The woven structure of FIG. 3-10 was used for the bag portion of this sample, and two rows of the plain woven structure shown in FIG. 6 were inserted into the boundary portion of FIG. FIGS. 11A and 11B show examples of the organization chart of the boundary portion of FIGS. 1A and 1B and the subsequent double bag portion at this time, respectively. The performance evaluation of this sample is shown in Table 1.
[0032]
Example 3
A nylon 66 filament yarn of 350 dtex / 108f is used for the warp and weft, and plain weaving using air jet loom and electronic jacquard device is used. After weaving using the same weaving structure of FIG. 3-1 as in Example 1 so that the weaving density of 57 wefts / 2.54 cm is passed through the boiling water shrinkage process, and subsequently through the drying and setting processes, Produced. The woven structure of FIG. 3-1 was used for the bag portion of this sample, and two rows of the plain woven structure shown in FIG. 6 were inserted into the boundary portion of FIG. FIGS. 10A and 10B show examples of the organization chart of the boundary portion of FIGS. 1A and 1B and the double bag portion that follows the boundary portion of FIGS. The performance evaluation of this sample is shown in Table 1.
[0033]
Comparative Example 1
Using nylon 66 filament yarn of 350 dtex / 108f for the warp and weft, plain weaving using air jet loom and electronic jacquard device, Fig. 1-1 part is processed with double bag part, warp 60 / 2.54cm, After weaving using the woven structure of FIG. 4-5 so that the weaving density is 60 wefts / 2.54 cm, it is passed through a boiling water shrinking process, followed by drying and a setting process to produce a work process. The woven structure of FIG. 4-5 was used for the bag portion of this sample, and two rows of the plain woven structure shown in FIG. 6 were inserted into the boundary portion of FIG. FIGS. 12A and 12B show examples of organization charts of the boundary portion of FIGS. 1A and 1B and the subsequent double bag portion at this time, respectively. The performance evaluation of this sample is shown in Table 1.
[0034]
Comparative Example 2
Using nylon 66 filament yarn of 350 dtex / 108f for the warp and weft, plain weaving using air jet loom and electronic jacquard device, Fig. 1-1 part is processed with double bag part, warp 60 / 2.54cm, After weaving using the woven structure of FIG. 4-73 so that the weaving density is 60 wefts / 2.54 cm, it is passed through a boiling water shrinking process, followed by drying and a setting process to produce a work process. The weave structure of FIG. 4-73 was used for the bag portion of this sample, and two rows of the plain weave structure shown in FIG. 6 were inserted into the boundary portion of FIG. FIGS. 13A and 13B show examples of organization charts of the boundary portion 1-a and the boundary portion of FIG. The performance evaluation of this sample is shown in Table 1.
[0035]
Comparative Example 3
A nylon 66 filament yarn of 350 dtex / 108f is used for the warp and weft, and plain weaving using air jet loom and electronic jacquard device is used. After weaving using the same weaving structure of FIG. 4-5 as Comparative Example 1 so that the weaving density is 57 wefts / 2.54 cm, it is passed through a boiling water shrinking process, followed by a drying and setting process. Produced. The woven structure of FIG. 4-5 was used for the bag portion of this sample, and two rows of the plain woven structure shown in FIG. 6 were inserted into the boundary portion of FIG. FIGS. 12A and 12B show examples of organization charts of the boundary portion of the 1-a portion and FIG. 1-b portion at this time and the subsequent double bag portion. The performance evaluation of this sample is shown in Table 1.
[0036]
[Table 1]

[0037]
The organization chart (FIGS. 4-5) adopted in Comparative Examples 1 and 3 forms an upper cloth or a lower cloth with two adjacent wefts before weaving as described above. Therefore, at the boundary portion in the warp direction of the airbags of Comparative Examples 1 and 3, two wefts (upper and lower wefts in FIG. 12) float on the lower one warp in FIG. At the boundary in the direction, there are three and four wefts in the lower part of FIG. 12 that do not constitute a plain weave in the bag part, so that two wefts float in the upper four warp parts in FIG. Since the yarn floating creates a space in which yarn misalignment occurs, the amount of opening increases. In actuality, air leakage derived from yarn misalignment occurs, the air permeability increases, the amount of air leakage from the bag increases, and the bag internal pressure retention value also decreases.
[0038]
Furthermore, the organization chart (structure chart 73 in FIG. 4) adopted in Comparative Example 2 not only forms an upper fabric or a lower fabric with two adjacent wefts before weaving as described above, but also warps before weaving. An upper cloth or a lower cloth is formed by two adjacent warps. Therefore, in the airbag of the comparative example 2, the yarn misalignment of two yarns occurs at both the warp direction boundary portion and the weft direction boundary portion (FIGS. 13A and 13B). Compared with the airbag, the size of the shift of the entire boundary increases, and the amount of openings increases on average as shown in Table 1. Therefore, the air permeability and the amount of air leakage from the bag are also considerably large, and the bag internal pressure holding value is extremely low.
[0039]
On the other hand, the organization chart (FIGS. 3-1) adopted in Examples 1 and 3 and the organization chart (FIG. 3-10) adopted in Example 2 are 1 for both warp and weft before weaving as described above. An upper cloth and a lower cloth are formed alternately one by one. The bag portion in contact with the boundary portion constitutes a plain weave structure as an upper cloth or a lower cloth of the bag portion in both the warp direction and the weft direction, and the weaving yarns are constrained by the weft and warp so that two or more yarn floats do not occur. For this reason, yarn displacement at the boundary is minimized, air leakage from the mesh openings and air permeability are reduced, and the bag internal pressure retention value is extremely high.
[0040]
In addition, since the airbag of Example 3 has a slightly lower woven density than the airbags of Examples 1 and 2, even with the same yarn displacement as that of the airbags of Examples 1 and 2, the amount of deviation is small. The amount of opening, air permeability, and the amount of air leakage from the bag are somewhat increased, but the bag internal pressure retention value is still as high as 85, which is not a problem.
[0041]
【The invention's effect】
The bag-woven airbag base fabric and airbag according to the present invention are a double-woven structure of a bag woven fabric in which both an upper fabric and a lower fabric are formed by plain weaving. Alternatively, since the double weave structure is defined so as not to form the lower fabric, the movement of the yarn at the boundary with the single connecting portion when the airbag is deployed is suppressed to one yarn, and the minimum yarn displacement It can be suppressed to occurrence. Therefore, according to the present invention, it is possible to reduce eye misalignment at the boundary when the air bag is deployed, prevent air leakage from the eye misalignment, and finally suitable for side protection with improved internal pressure holding performance of the bag. Can be provided.
[Brief description of the drawings]
FIG. 1 is a schematic view of a bag-woven airbag used in Examples.
FIG. 2 is an explanatory diagram of numbers before weaving in a warp and weft of a double weaving structure.
FIG. 3 is a column of a structure diagram of a double weave that can be employed in weaving a bag-woven airbag base fabric according to the present invention.
FIG. 4 is a column of a structure diagram of a double weave that cannot be used in weaving a bag-woven airbag base fabric according to the present invention.
FIG. 5 is an example of a woven structure of a portion (a connected single portion) that does not expand as a bag body when the airbag is activated.
FIG. 6 is a boundary texture used in the examples.
7 is a detail of the organization chart 5 of FIG.
8 is a detail of the organization chart 73 of FIG.
9 is a detail of the organization chart 1 of FIG.
FIG. 10 is an example of an organization chart (FIG. 10 (a)) of the boundary portion of FIG. The organization chart example (FIG. 10B) of the boundary part and the subsequent double bag part is shown.
FIG. 11 shows an example of a structural diagram (FIG. 11 (a)) of the boundary portion of FIG. 1-a portion of the airbag of Example 2 and a double bag portion that follows the boundary portion of FIG. And the organization chart example (FIG.11 (b)) of the double bag part following it is shown.
12 is an example of a structural diagram (FIG. 12 (a)) of the boundary portion of FIG. 1-a portion of the airbag of Comparative Examples 1 and 3 and the subsequent double bag portion and FIG. 1-b portion of the same airbag. The example of a structure chart (Drawing 12 (b)) of a boundary part and a double bag part following it is shown.
13 is an example of a structural diagram (FIG. 13 (a)) of the boundary portion of FIG. 1-a portion of the airbag of Comparative Example 2 and the subsequent double bag portion, and the boundary portion of FIG. 1-b portion of the same airbag. And the organization chart example (FIG.13 (b)) of the double bag part following it is shown.

Claims (3)

A bag weaving part (double weaving part) which is composed of an upper cloth and a lower cloth and becomes a bag when the airbag is deployed, a connecting single part (A part) which does not expand when the airbag is operated, and a boundary part between the bag weaving part and the A part ( a hollow weave air bag base fabric having a B portion), the plain weave is inserted into the boundary portion and the upper cloth and the double weave of hollow weave portion together form plain weave the lower cloth,
Forming a top fabric by combining warp 1-3 before weaving 1-3 weft 1-3, and forming a bottom fabric by combining warp 2-4 weft 2-4 before weaving;
Forming a top fabric by combining warp 2-4 before weaving 2-4 weft 2-4 and forming a bottom fabric by combining warp 1-3 weft 1-3 before weaving;
An upper cloth is formed by a combination of warp 1-3 and weft 2-4 before weaving, and a lower cloth is formed by a combination of warp 2-4 weft 1-3 before weaving, or warp 2 before weaving A bag-woven airbag base fabric, wherein an upper cloth is formed by a combination of -4 wefts 1-3 and a lower cloth is formed by a combination of warp 1-3 and wefts 2-4 before weaving.   A bag-woven airbag using the bag-woven airbag base fabric according to claim 1.   The bag-woven airbag according to claim 2, wherein the airbag is a side-protecting airbag.

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