JPH04163252A - Air bag - Google Patents

Abstract

PURPOSE:To eliminate a cover of an elastomer, to provide soft and excellent folding ability, to reduce a volume when an air bag is folded, and to reduce the weight of the air bag by sewing a fabric, woven by using a fiber filament containing a high strength heat resisting fiber, in a bagform shape. CONSTITUTION:In an air bag 1, a fabric A2, having a cover factor of 1900 or more and a fiber filling rate of 0.5 or more, woven by using a fiber filament A1 containing a high strength heat resisting fiber having monofilament fineness of 2 de or less, a strength of 16g/de or more, and a thermal decomposition temperature of 300 deg.C or more is sewn in a bagform shape to form a body, and at least one or more fabrics B2, having a cover factor of 1900 or more and a fiber filling rate of 0.50 or more, woven by using a filament B1 containing more quantity of high strength heat resisting fibers than the filament A1, are sewn in a laminated state to form an inflator mounting part 2, which is located as an apron. The filament A1 is produced such that 30-90wt.% thermoplastic synthetic fibers having a monofilament fineness of 5 de or less and a Young's modulus of 1300kg/cm<2> or less are combined, and paraaromatic polyamide fibers are used as the high strength heat-resisting fibers.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an airbag for automobiles. More specifically, the present invention relates to an airbag made of a bag body sewn from a fabric that is flame resistant, lightweight, and has appropriate breathability and foldability.

(Prior art) Conventional airbags are made of thermoplastic materials such as nylon 6, nylon 66° polyester, etc. A high-strength filament made of i-fibers with a total fineness of 400 to 1000 deniers is woven into a plain weave or ripstop fabric, and the fabric is coated with an elastomer such as chloroprene or silicone and sewn into a bag as shown in Figure 4. has been used. It has also been put to practical use as a device as shown in Figure 7 (Japanese Patent Publication No. 48-30293,
Utility Model Publication No. 48-81543, Utility Model Application Publication No. 51-1793
Publication No. 6, etc.). In other words, all of these airbag fabrics have heat resistance and flame resistance, and when an aircraft or automobile crashes, electric current is applied to the power cord ■ of the inflator ■, as shown in Figure 7. It is designed to withstand the high-temperature blast and flame ejected from the combustion gas injection port (2) when the air bag (2) expands into a spherical shape as the inflator burns. In other words, in order to meet the safety standards for airbags, elastomer is coated with a fairly high fabric weight, making the airbag heavy and stiff, which significantly reduces the ease of handling when sewing, and when folded. This increases the volume of the product, creating an obstacle when installing it in a vehicle. Due to its nature, an airbag device with a built-in airbag must be placed in front of the driver, and since there is a steering wheel, various instruments, and windows in the front, there is not enough space and it is a little difficult to install. However, a compact airbag device is desired. Furthermore, when attached to a steering wheel, etc., an airbag that is as light as possible is desired for operational reasons.

(Object of the Invention) The present invention has been made to solve the problems encountered in the prior art. In other words, it is a fabric that is not coated with an elastomer such as chloroprene or silicone,
Another object of the present invention is to provide an airbag whose bag body is made of fabric that can withstand high-temperature blast waves and flames emitted from an inflator in the event of a collision.

(Structure of the invention) "(1) Single yarn fineness 26e or less, strength 16g/de or more,
Fabric A2 having a cover factor of 1900 or more and a fiber filling rate of 0.5 or more, which is woven using fiber yarn A1 containing high-strength heat-resistant fibers with a thermal decomposition temperature of 300° C. or more, is sewn into a bag shape to form the main body, and The inflator mounting section is woven using yarn B1 containing the high-strength heat-resistant fiber in yarn A1 or more, with a cover factor of 1900 or more and a fiber filling rate of 0.5.
An airbag characterized in that an apron is formed by laminating and sewing at least one fabric B2 of 0 or more.

(2) At least one piece of fabric B2 woven using yarn B1, which is made by mixing at least 5% by weight or more of high-strength, heat-resistant fibers than yarn A1, is laminated and sewn on the inner surface of the bag as an apron. The airbag according to claim (1).

(3) Yarn A1 has a single yarn fineness of 5 de or less and a Young's modulus of 13
00kg/1Il12 or less thermoplastic synthetic fiber from 30~
The airbag according to claim 1 or 2, comprising 90% by weight of mixed fibers.

(4) The airbag according to any one of claims (1) to (3), wherein the high-strength heat-resistant fiber is a para-aromatic polyamide fiber.

(5) The airbag according to any one of claims (1) to (4), wherein the fabric woven with yarn A1 has flame contact resistance of 5 seconds or more.

(6) The airbag according to any one of claims (1) to (5), wherein the yarns A1 and B1 are tension-cut spun yarns produced by a tension-cutting method.

(7) A fiber containing high-strength heat-resistant fibers in which yarns A1 and B1 have a single yarn fineness of 2 de or less and a thermal decomposition temperature of 300°C or more,
The air according to any one of claims (1) to (6), which is obtained by tearing the fibers between a supply roller and a tension cutting roller while preventing disturbance of the fibers, and then conjugating them with an air nozzle. bag. ”.

The high-strength heat-resistant fiber in the present invention has a thermal decomposition temperature of 30
Fibers with a temperature of 0°C or higher, such as meta or para fully aromatic polyamides! Ijlli! f (aramid fiber)
, specifically, polyparaphenylene isophthalamide fiber, polyparaphenylene terephthalamide m navy blue, copolymer fiber of para-aramid and meta-aramid, or copolymerization of aromatic ether such as 3.4゛-diaminodiphenyl ether. It refers to para-aramid fibers, poly-para-phenylene sulfone fibers, poly-para-phenylene sulfide fibers, wholly aromatic polyester fibers, polyimide fibers, polyetherimide fibers, polyether ether ketone fibers, etc., or mixed fibers thereof. Among these, polyparaphenylene terephthalamide fiber and 3,4
Particularly preferred is polyparaphenyleneoxydiphenylene terephthalamide fiber, which is a para-aramid fiber copolymerized with diaminodiphenyl ether.

The present inventors believe that even if an airbag made of a fabric containing such high-strength heat-resistant fibers is coated with an elastomer,
It has been found that the inflator does not melt, break, or burst into flames due to the high-temperature blast and flame emitted from the inflator.

The single fiber fineness of the high-strength, heat-resistant fiber needs to be 26e or less. It is extremely important that airbags be flexible because they need to be folded into a small size.

If it exceeds 2 de, the resulting air bag becomes extremely stiff and is no different from one coated with an elastomer. Furthermore, since the number of fibers constituting the yarn is reduced and the fiber gaps are widened, the air permeability of the fabric increases, making it impossible to sufficiently block out the high-temperature blast and flame emitted from the inflator. Furthermore, the smaller the single fiber fineness and the larger the number of constituent fibers, the better the flame contact resistance, and from this point of view as well, the single fiber fineness of the high-strength, heat-resistant fiber needs to be 2 de or less.

The fiber filling rate of a woven fabric in the present invention refers to a value obtained by dividing the bulk specific gravity of the woven fabric by its true specific gravity. If the fiber filling rate is less than 0.50, the hiding effect of the fabric will be low, and the fabric will not be able to sufficiently block high-temperature blast waves and flames emitted from the inflator. Therefore, the fiber filling rate needs to be 0.50 or more. Moreover, if the fiber filling rate exceeds 0.87, the flexibility of the fabric will be lost and the resulting airbag will become extremely film-like. Therefore, the fiber filling rate is preferably 0.50 or more and 0.87 or less, and 0.55 or more and 0.82
The following are more preferable. The fiber filling rate can be achieved by hot-pressing a densely woven fabric using one or more pairs of upper and lower metal/elastic roller calenders or metal/metal roller calenders. The surface temperature of the metal roller at this time is 150 to 300°C. Further, the calender pressure is preferably 100 kq/c1 or more. To achieve a sufficient hot-pressure effect, it is desirable to preheat the fabric or process it at low speed.

The cover factor of a woven fabric in the present invention is the sum of the warp and weft of the product of the square root of the yarn fineness and the number of yarns per inch. If the cover factor is less than 1900, the hiding effect of the fabric will be low, and even if calendering is applied, the above fiber filling rate cannot be achieved, and therefore the fabric will not be able to sufficiently block the high temperature blast and flame emitted from the inflator. It disappears.

Therefore, the cover factor is preferably 1900 or more. When the cover factor exceeds 3900, the fabric loses its flexibility and the resulting airbag becomes extremely stiff and stiff, no different from an elastomer-covered airbag. Therefore, the cover factor is 19
00 or more and 3900 or less, preferably 2000 or more and 3
More preferably, it is 500 or less.

In the present invention, the fiber filling rate and cover factor are important factors that determine the performance of the airbag, and by satisfying the above values, the airbag can be made flexible and compact while reducing the air permeability of the l1iIli object. can do.

Thermoplastic synthetic fibers in the present invention are fiber threads made of ordinary thermoplastic synthetic resins, such as polyester fibers,
It is made of nylon fiber, acrylic fiber, polypropylene fiber, etc.

The fiber containing the high-strength heat-resistant fiber in the present invention may be a blend of the above-mentioned thermoplastic synthetic fibers on the order of 1 m fiber. The single filament fineness of the thermoplastic synthetic fiber is preferably 5 de or less for the same reasons as those for high-strength, heat-resistant fibers, and because if the single filament fineness is large, the number of fibers constituting the yarn will decrease, making it difficult to obtain a uniform mixed fiber. is preferably 25 de or less.

In addition, the Young's modulus of thermoplastic synthetic fiber is 1300 kg/T.
It is preferable to make it less than a1l. 1300kg/1
If T12 is exceeded, many of the other components, high-strength, heat-resistant fibers, have a high Young's modulus, so the Young's modulus of the yarn after blending becomes high, and the fabric after weaving becomes coarse and stiff. So I don't like it. Therefore, the Young's modulus of the thermoplastic synthetic fiber is 1300 kg/nun2 or less, preferably 1200 k
g/in” or less.

The yarn A1 in the present invention may be a mixture of high-strength, heat-resistant m+ fibers (b) and thermoplastic synthetic fibers (a) in the order of single fibers. The ratio a/b at this time is 90:10
~30:70 (preferably 80:2 (1~40:
A range of 60) is preferable. If a/b exceeds 90/10, the heat resistance and flame resistance of the fabric A2 will decrease. In addition, sufficient strength cannot be obtained unless the thickness of the yarn is considerably thickened, which is undesirable as it results in a thick woven fabric. Also, a/b is 30
/ If it is less than 70, the feel of the high-strength, heat-resistant fiber with a high Young's modulus becomes rough and stiff, resulting in poor flexibility and poor hand feel. Furthermore, thermal shrinkage of thermoplastic synthetic fibers is limited, making it difficult to obtain dense fabrics with low air permeability.

The apron of the airbag in the present invention refers to a patch fabric laminated around the inflator insertion hole. The apron is intended to reinforce the area where the high-temperature gas and flame that are rapidly jetted from the inflator first collide.

The airbag of the present invention has at least one fabric B2 woven using the yarn B1, which is a blend of at least 5% by weight or more of high-strength heat-resistant fibers than the yarn A1, as an apron on the inner surface of the bag. It is preferable to use laminated sewing. If it is less than 5% by weight, the fabric B2 constituting the apron section will not be able to sufficiently block the high-temperature blast and flame emitted from the inflator. Therefore, it is preferably 5% by weight or more, preferably 10% by weight or more. Any number of aprons may be used, but if there are too many layers, folding will deteriorate. The preferred number is 1 to 4, and more preferably 2 to 3.

Also, the size of the apron should be larger than the inside of the bag.

Further, as for the construction of the apron, it is preferable to use a woven fabric in which high-strength, heat-resistant fibers are mixed in increasing proportions toward the inner surface of the bag, which is in direct contact with gas from the inflator. That is, at least one apron made of fabric B2 is laminated on the inner surface of the bag, and at least one apron made of fabric B1 is laminated and sewn between fabric B2 and the bag body. In the airbag of the present invention, by employing an apron S type with an increased blending ratio of high-strength heat-resistant fibers, the heat resistance, especially in the apron, is significantly increased and reliability is improved.

Further, the strength of the high-strength heat-resistant fiber is 16 g/de or more. If it is less than 16 g/de, sufficient strength cannot be obtained when it is made into a fabric, and the air bag is often damaged during inflation. In particular, in the case of blended yarns with thermoplastic synthetic fibers, the strength of high-strength, heat-resistant fibers is 16 g/d.
A strength of at least e, preferably at least 18 g/de is good.゛Also, 1l11' in the present invention! It is preferable that IJ has flame contact resistance of 5 seconds or more. If the contact flame resistance is less than 5 seconds, even if other performance requirements are met, the airbag will not be able to sufficiently block the high-temperature flame ejected from the inflator, resulting in combustion damage. Therefore, flame contact resistance is preferably 5 seconds or more, more preferably 10 seconds or more.

It is preferable that the threads of the woven fabric in the present invention consist of stretch-cut spun yarns produced by a stretch-cut method. Since the stretch-cut spun yarn has fluff in its yarn form and the fibers are randomized, it is possible to reduce the air permeability by making the gaps in the fabric structure smaller compared to continuous filaments. Furthermore, the frictional resistance between the fibers is large, making it difficult for seam slippage to occur in the sewn portion. On the other hand, compared to conventional spun yarns, the degree of fiber arrangement is higher, the fibers are stretched to the limit by tension cutting, and the fiber length is longer, resulting in a highly tenacious yarn, = 1
4- Extremely suitable for use in airbags.

Next, an example of a method for producing a tension-cut spun yarn of heat-resistant fibers will be explained with reference to the drawings.

FIG. 1 shows a fiber mixing device. A is a nip roller, 2 is a shooter 13 is a tension nip roller, 4 is a suction air nozzle, 5 is a combination nozzle using a swirling flow, 6 is a delivery roller, and 7 is a thread. The heat-resistant fibers pass through the supply nip roller while being aligned and overlapped in front of the supply nip roller 1, and are simultaneously torn off by the tension-cut nip roller in the shooter 2, and are uniformly tension-cut while being drafted. It is then torn off from the tension cutting roller by the suction air nozzle 4, and then by the swirling conjugation nozzle 5.
After being imparted with conjugation properties by entanglement and fuzz wrapping, the short fibers are torn off by a delivery roller 6 to form threads 7 in which short fiber fuzz is randomly wound around the east side of the fiber.

After twisting the obtained yarn appropriately, it is woven into a plain fiber at a high weaving density using warp and weft yarns, and after being subjected to scouring, heat setting, relaxation, and calendar processing, it is made into a bag as shown in Figure 4. An airbag is made of II on the body. In addition, ■ in the figure
indicates the inflation insertion hole, and ■ indicates the inflator combustion gas exhaust port.

(Effects of the Invention) Since the airbag of the present invention contains high-strength, heat-resistant fibers and is not coated with an elastomer, it has the following effects compared to conventional coated airbags.

+1) The ml product is flexible and has excellent foldability.

(2) Small volume when folded.

(3) It is lightweight.

(4) The object itself has heat resistance and strength to withstand high-temperature blast waves and flames.

(5) Impact and abrasion resistance during expansion are small and will not cause damage.

(6) Easy to sew.

(7) Not easily damaged by metal pieces, glass pieces, etc.

(8) There is little change in the performance of the airbag fabric even after a long period of time.

(Example) The present invention will be explained below with reference to Examples. In addition, each evaluation item in Examples was evaluated according to the following method.

Inflation test: The inflator was sewn into the shape of an airbag, attached to an airbag device, and the inflator was burned, and the presence or absence of damage to the airbag was evaluated.

Flame contact test; horizontally hold the fabric sample attached to the frame and hold it approximately 78 cm from below.
When exposed to a 0°C flame, the time required for combustion to form a hole was measured.

Weight; It was measured by the method of JIS L-1096.

Thickness: It was measured by the method of JIS L-1096.

Tensile strength: Measured by the strip method of JIS L-1096.

Bursting strength: Measured by the Mucin method of JIS L-1096.

Breathability; Measured by JIS L-1096 Frazier method.

Storage: Fold the airbag along the dotted lines 4 shown in Figures 5 (A) and (B) to form the shape shown in (C), and then fold it into the shape shown in Figure 6 (5)! The thickness 't was measured by applying a positive load of 5.

Texture: A sensory evaluation was conducted regarding the feel and flexibility of the textile surface, assuming that the face would be strongly hit by an airbag in the event of a collision, and the textiles were classified into soft ones and rough and stiff ones.

Example 1 Using the apparatus shown in Fig. 1, single yarn fineness of 0.5 denier,
Polyester fiber a (Tetron ■: manufactured by Teijin ■) with a strength of 6 g/de and a total fineness of 4000 denier, and a single yarn fineness of 0.7
Rose aromatic polyamide fiber B (Technora ■: manufactured by Teijin ■) of 5 denier, strength 28 g/da, and total fineness 1000 denier was layered and aligned, and a supply nip roller 1 and a shooter were prepared with a distance between the rollers of 100 cn. 2 and tension cutting roller 3 at a speed of 300 m/min at a speed of about 16 times, the fibers were simultaneously torn into thin single fiber bundles. Next, an air nozzle 4 having suction properties and a combination nozzle 5 having a swirling flow.
Then, the yarn 7 (AI) of 300 denier was passed through the tension nip roller 3 and the delivery roller 6 at a speed ratio of 100:97 to impart entanglement and wrap the fluff of the single fiber randomly around the east side of the fiber. Good value. The ratio of polyester fiber and para-aromatic polyamide fiber in the obtained yarn was 80:2.
It was 0. The average fiber length of these yarns is 42cm for polyester fiber and 37cm for para-aromatic polyamide fiber.
It was n. In addition, the strength and elongation of each yarn is 8.2 g.
/d'e, 4.5% (both measured after twisting at 400 T/m). Then the main thread is 400T/m
It was woven into a plain weave at a weave density of 67 yarns/inch in the warp and 62 yarns/inch in the weft, followed by heat setting and scouring. Next, a linear pressure of 400 kG/Cl was applied using a pair of metal/elastic roller calenders with a metal roller surface temperature of 180°C.
1. Woven fabric (A) calendered at a speed of 10 m/min
2) was obtained.

Further, by changing the ratio of the supplied denier in the same manner as -19=, yarn 7 (81,) of 300 denier was obtained. The ratio of polyester fibers and para-aromatic polyamide fibers in the obtained yarn was 60:40. In addition, the strength and elongation were 92 g/de and 41% (both measured after twisting at 400'r'/m). Next, a fabric B2 was woven in the same manner using this yarn B1.

Next, the fabric A2 is used as the main body, and the two fabrics B2 and A2 are laminated and sewn on the inside of the bag to form an apron, starting from the inside surface of the bag. created an airbag. The evaluation results of the obtained airbag are shown in Table 1 in comparison with the yarn and fabric.

Example 2 A 300 denier yarn 7 (
AI, Bl) were obtained. 1 m of the resulting polyester yarn
The ratio of female and para-aromatic polyamide fibers is both 80:
It was 20. The average fiber length of these yarns is 42 cl for polyester fiber and 37 cl for para-aromatic polyamide fiber.
It was cl. In addition, the strength and elongation of each yarn is 8.2g.
/de, 4.5% (both measured after 400T/m twisting). Next, the main yarn was twisted at 400 T/m, woven into a plain weave at a weave density of 67 threads/inch in warp and 62 threads/inch in weft, and heat-set and scouring. next,
Using a pair of metal/elastic roller calenders with a metal roller surface temperature of 190°C, linear pressure of 400 kQ/a, 12 m
Fabric A2 was obtained which was calendered at a speed of /min. Fabric B2 was also obtained in the same manner by plain weaving at a weave density of 70 warps/inch and weft 64 threads/inch.

Next, fabric A2 is used as the main body, and a total of two fabrics, one fabric B2 and two fabric A2, are laminated and sewn on the inside of the bag in order from the inner surface of the bag as an apron.
An airbag as shown in the figure was created. The evaluation results of the obtained airbag are shown in Table 1 in comparison with the yarn and fabric.

Example 3 In the same manner as in Example 1, 300 denier yarn 7 (
A1. Bl) was obtained. The ratio of polyester fibers and para-aromatic polyamide fibers in the obtained yarn was A1: 80:
20, B1 was o: ioo. In addition, the strength and elongation of this yarn are 8.2 g/de and 4.5% for A1 and 4.5% (both measured after 400 T/m twisting), and 22 g/de for B1.
de, 3.8% (both measured after 400T/m twisting). Next, AI and Bl were twisted at 400 T/m, and A1 was woven into a flat string at a weave density of 67 threads/inch in warp and 62 threads/inch in weft, and heat set and scouring were performed. Next, using a pair of metal/elastic roller calenders with a metal roller surface temperature of 190°C, a linear pressure of 400 kg/
ci, fabric A calendered at a speed of 12 m/min
I got 2. Further, B1 was woven into a plain weave at a weave density of 79 threads/inch in the warp and 72 threads/inch in the weft, and a woven fabric B2 was obtained in the same manner.

Next, fabric A2 is used as the main body, and fabric B2 is placed inside the bag.
By laminating and sewing only one apron, the fourth
An airbag as shown in the figure was created. The evaluation results of the obtained airbag are shown in Table 1 in comparison with the yarn and fabric.

Example 4 Using the apparatus shown in FIG. 2, single yarn fineness of 2.1 denier,
Polyester fiber a with a strength of 8.5 g/de and a total fineness of 300 denier and a single yarn fineness of 1.5 denier and a strength of 28 g/de
para aromatic polyamide fiber b (Technora ■) with a total fineness of 100 denier was adjusted so that the tension was the same, and was drawn together, and water was applied by running it in contact with the water adhesion roller 1. Both fibers were uniformly mixed in the order of single fibers between the supply roller 2 and the delivery roller 4 through the mixed air nozzle 3 to obtain a 400-denier yarn 5 (yarn At). The ratio of polyester fibers and para-aromatic polyamide fibers in the resulting yarn was 75:25. The strength is 8.3g/de (3
50T/M after twisting). Next, 3
It was twisted at 50T/M and woven into a plain weave with a weave density of 58 warps/inch and weft 54 threads/inch, and heat-set, scouring, calendering, etc. were performed in the same manner as in Example 1 to obtain woven eIA2.
Don't get it.

Next, using the tow spinning device shown in Figure 3, the single yarn fineness was 1.5.
Average fiber length: 100 obtained by cutting a polyester fiber bundle with a total fineness of 90,000 denier at a total draft of 7 times
I11, a sliver with a total denier of 13,000 denier and a rose aromatic polyamide fiber bundle (Deknora ■) with a single yarn fineness of 1.5 denier and a total fineness of 90,000 denier were cut at a total draft of 7 times. Average fiber length 89ii,
Total fineness 13,000 denier, Young's modulus 7100km l1
A sliver of n12 was combined and passed through the gill. Furthermore, a spun yarn B1 of 10.6 count (500 denier) was obtained with a ratio of polyester fiber and para-aromatic polyamide fiber of 50:50 through one culm each of roving and spinning. This yarn was woven into a plain weave #Il fabric with a warp of 48 threads/inch and a weft of 46 threads/inch, and heat-set, scouring, calendering, etc. were performed in the same manner as in Example 1, and then a material B2 Obtained.

Next, fabric A2 is used as the main body, and a total of 3 pieces, 1 piece of fabric B2 and 2 pieces of fabric A2, are laminated and sewn on the inside of the bag in order from the inner surface of the bag.
Create an airbag like the one shown in the figure. The evaluation results of the obtained airbag are shown in Table 1 in comparison with the yarn and fabric.

Comparative Example 1 A fabric having a thickness of 0.38n+m, using threads C1 and Dl consisting of nylon 66 filament yarns with a single yarn fineness of 6 denier and a total fineness of 840 denier as the warp and weft, and woven into a plain weave at a warp and warp of 25 yarns/inch. Don't get it.

Next, the chloroprene rubber was manufactured by Germany A and UMA's Rolle.
r-Head, Continuous vulcan
Approximately I
GOg/m" was applied to obtain a base fabric C2 having a thickness of 0.431 am. The vulcanization conditions at this time were 180° C. for 1.5 minutes.

Next, silicone rubber was applied in the same manner instead of chloroprene rubber to obtain a base fabric D2 having a thickness of 0.43 nm. The vulcanization conditions at this time were 180° C. and 1.0 minutes.

Next, the base fabric C2 is used as the main body, and a total of 3 pieces, 1 piece of base fabric D2 and 2 pieces of base fabric C2, are laminated and sewn on the inside of the bag in order from the inner surface of the bag.
An airbag as shown in the figure was created. The evaluation results of the obtained airbag are shown in Table 2 in comparison with the yarn and fabric.

Comparative Example 2 Yarns C1 and Dl, each consisting of a polyester filament with a single yarn fineness of 2.5 denier, a strength of 8.5 g/de, and a total fineness of 500 denier, were twisted at 200 T/M to create a yarn with a warp of 5
It was woven into a plain weave at a weave density of 0 threads/inch and weft of 49 threads/inch. Next, apply approximately 100 g/m of chloroprene rubber in the same manner.
After coating, a base fabric C2 having a thickness of 0.26 mm+ was obtained. The vulcanization conditions at this time were 180° C. and 1.5 minutes.

Next, silicone rubber was applied in the same manner instead of chloroprene rubber to obtain a base fabric D2 having a thickness of 0.26 inches. The vulcanization conditions at this time were 180°C and 1.1 minutes.

Next, the base fabric C2 is used as the main body, and a total of 3 pieces, 1 piece of base fabric D2 and 2 pieces of base fabric C2, are laminated and sewn on the inside of the bag in order from the inner surface of the bag to form a fourth layer.
An airbag as shown in the figure was created. The evaluation results of the obtained airbag are shown in Table 2 in comparison with the yarn and fabric.

Comparative Example 3 In the same manner as in Example 1, 450-denier stretch-cut spun yarn 7 (A1 and B1) consisting of polyester fiber a and para-aromatic polyamide fiber was obtained.

Next, A1 was twisted at 300 T/m to a warp of 40
It was woven into a plain weave at a weave density of 40 threads/inch and weft of 40 threads/inch, and was subjected to heat setting and scouring. Next, using a pair of metal/elastic roller calenders with a metal roller surface temperature of 180° C., calendering was performed at a linear pressure of 400 kg/cl and a speed of 5 m/min to obtain woven fabric A2.

Further, B1 was woven into a plain weave with a #density of 92 yarns/inch in the warp and 99 yarns/inch in the weft, and was subjected to heat setting, scouring, and calendering to obtain woven fabric B2.

Next, fabric A2 is used as the main body, and a total of 3 pieces, 1 piece of fabric B2 and 2 pieces of fabric A2, are laminated and sewn on the inside of the bag in order from the inner surface of the bag.
An airbag as shown in the figure was created. The evaluation results of the obtained airbag are shown in Table 2 in comparison with the yarn and fabric.

Comparative Example 4 In the same manner as in Example 1, a 450-denier stretch-cut spun yarn 7 (AI and Bl) consisting of polyester fiber a and rose aromatic polyamide fiber was obtained.

Next, A1 was twisted at 300T/m to create a warp of 50/-
It was woven into a plain weave with a weave density of 27 to 27 inches and a weft of 50 threads/inch, and was heat set and refined. Next, calendering was performed using a pair of metal/elastic roller calenders with a metal roller surface temperature of 180° C. at a linear pressure of 80 kg/cIIl and a speed of 11 m/min to obtain woven fabric A2. Also, B1 is meridian 5
It was woven into a plain weave at a weave density of 5 threads/inch and weft of 54 threads/inch, and was subjected to heat setting and scouring.

Next, a linear pressure of 600 kg/crn was applied using a pair of metal/elastic roller calenders with a metal roller surface temperature of 220°C.
Calendering was performed at a speed of 2 m/min to obtain woven fabric A2.

Next, fabric A2 is used as the main body, and a total of 3 pieces, 1 piece of fabric B2 and 2 pieces of fabric A2, are laminated and sewn on the inside of the bag in order from the inner surface of the bag.
An airbag as shown in the figure was created. The evaluation results of the obtained airbag are shown in Table 2 in comparison with the yarn and fabric.

Comparative Example 5 Using the same method as in Example 1, a single yarn fineness of 1 denier and a strength of 8
．． 1 g/de, polynystyl fiber a (Tetron ■: manufactured by Teijin ■) with a total fineness of 6000 denier and a single yarn fineness of 1.5
Para aromatic polyamide fiber B with denier, strength 27g/de, total fineness 500 denier (Technora ■: Teijin ■
450
Denier yarn 7 (yarn Al) was obtained. The ratio of polyester fibers to para-aromatic polyamide fibers in the obtained yarn was 92:8.

The average fiber length was 4601 for the polyester fiber and 34 CII for the rose aromatic polyamide fiber. Further, the strength and elongation of this yarn was 5.6 g/de and 10.8% (both measured after twisting at 300 T/m). Next, the main yarn was twisted at 300 T/m to create a warp of 54 threads/inch.
Plain weave with a weave density of 50 wefts/inch, heat set,
A scouring process was carried out. Next, the fabric A2 was obtained by calendering in the same manner as in Example 1.

Using the same method, the single yarn fineness is 6 denier and the strength is 8.1 g/d.
e, polynisdel fiber a with a total fineness of 4000 denier (Tetron ■: manufactured by Teijin ■) and a single yarn fineness of 3 denier and strength 2
8g/de, para-aromatic polyamide lIA fiber b (Technora ■: made by Teijin ■) with a total fineness of 3000 denier is layered, aligned, and tension-cut to create yarn 7 (450 denier).
A yarn Al> was obtained.

The obtained polyester fiber and para-aromatic polyamide m
The ratio with kti was 57:43. Further, the average m fiber length was 40 cn for the polyester fiber and 35 co for the para-aromatic polyamide IIIA fiber. In addition, the strength and elongation of this yarn are 8.0 g/de and 4.8% (both 300 T/de)
(measured after twisting the yarn). Next, 300T is applied to the main yarn.
The fabric was woven into a plain weave with a weave density of 54 yarns/inch in the warp and 50 yarns/inch in the weft, and was subjected to heat cera 1 to scouring. Next, the fabric B2 was obtained by calendering in the same manner as in Example 1.

Next, fabric A2 is used as the main body, and from the inside surface of the bag, one piece of fabric B2 and two pieces of 1elA2 are used as an apron, and they are laminated and sewn on the inside of the bag to create an air bubble as shown in Figure 4. I created a bag. The evaluation results of the obtained airbag are shown in Table 2 in comparison with the yarn and fabric.

[Brief explanation of the drawing]

Figure 1 is a side view of a tension-cut direct spinning device, where A is a fiber yarn, 1 is a supply nip roller, 2 is a shooter 13 is a tension-cut nip roller, 4 is a suction air nozzle, and 5 is a swirling conjugation nozzle. , 6 is a delivery roller, and 7 is a thread. Figure 2 is a side view of ficimen 1 to the fiber mixing device, A. B is a fiber yarn, 1 is a water adhesion roller, 2.4 is a nip roller, 3 is a mixed fiber air nozzle, and 5 is a mixed fiber yarn. Figure 3 is a side view of the tow spinning device, 1 is the supply tow, 3.4
．． 5.6.7.8.9 is a nip roller, 2 is a set heater, 10 is a crimper, 511 is a sliver, and 12 is a storage can. FIG. 4 is a schematic diagram of the airbag 1, where (A) is a front view;
(B) is a sectional view taken along the plane X-X, 2 is the inflator insertion hole, and 3 is the exhaust hole for the combustion gas of the inflator. This is a schematic diagram illustrating how to fold the airbag 1 when evaluating the airbag, and shows folding along the dotted line 4. (c) shows the folded airbag. This is a schematic diagram illustrating the method of measuring the thickness of an airbag, where ■ indicates the folded airbag, 5 indicates the load weight, and ■ indicates the thickness of the folded airbag. Fig. 7 is a schematic diagram of the airbag device. 1 is a folded air bag, 6 is an inflator, 17 is a combustion gas injection hole, 8 is a power cord, 9 is a case, and 1' is the shape of the air bag 1 when it is inflated.

Claims (7)

[Claims] (1) Cover factor 1900 or more, fiber filling rate 0.5 or more, woven using fiber yarn A1 containing high tenacity heat-resistant fibers with single yarn fineness 2de or less, strength 16g/de or more, and thermal decomposition temperature 300°C or more The fabric A2 is sewn into a bag shape to form the main body, and the inflator attachment part is woven using yarn B1 containing the high-strength heat-resistant fiber in yarn A1 or more, with a cover factor of 1900 or more and a fiber filling rate of 0. 50
An airbag characterized in that an apron is formed by laminating and sewing at least one fabric B2 as described above. (2) At least one piece of fabric B2 woven using yarn B1, which is made by mixing at least 5% by weight or more of high-strength, heat-resistant fibers than yarn A1, is laminated and sewn on the inner surface of the bag as an apron. The airbag according to claim (1). (3) Yarn A1 has a single yarn fineness of 5 de or less and a Young's modulus of 13
00kg/mm^2 or less thermoplastic synthetic fibers from 30 to 9
The airbag according to claim 1 or 2, comprising 0% by weight of mixed fibers. (4) The airbag according to any one of claims (1) to (3), wherein the high-strength heat-resistant fiber is a para-aromatic polyamide fiber. (5) The airbag according to any one of claims (1) to (4), wherein the fabric woven with yarn A1 has flame contact resistance of 5 seconds or more. (6) The airbag according to any one of claims (1) to (5), wherein the yarns A1 and B1 are tension-cut spun yarns produced by a tension-cutting method. (7) A fiber containing high-strength heat-resistant fibers in which yarns A1 and B1 have a single yarn fineness of 2 de or less and a thermal decomposition temperature of 300°C or more,
The air according to any one of claims (1) to (6), which is a yarn obtained by tearing the fibers between a supply roller and a tension cutting roller while preventing disturbance of the fibers, and then conjugating them with an air nozzle. bag.