JPH0593340A - Vent cloth and air bag production therefrom - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a vent cloth for air bags that has high strength and excellent filtering effect, and does not require vent holes [Structure] Single yarn fineness 2 de or less, strength 16 g / de or more, average fiber length Cover factor 1 is obtained by weaving using a yarn containing a high-strength heat-resistant fiber such as a para aromatic polyamide having a thermal decomposition temperature of 10 to 80 cm and a temperature of 300 ° C or higher.
Woven fabric with 700-3000, fiber packing ratio 0.3-0.8 and Frazier air permeability 0.2-4.0.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vent cloth and an air bag using the same, and more particularly to a vent cloth which has an excellent filtering effect and does not require a vent hole, and a light weight, compactness and storage using the same. An air bag with excellent properties.

[0002]

2. Description of the Related Art A conventional airbag is produced by weaving a high-strength filament having a total fineness of 400 to 1,000 denier made of thermoplastic fibers such as nylon 6, nylon 6,6 and polyester into a plain weave fabric. A large amount of chloroprene rubber has been coated on and sewn into a bag body has been used. Further, it has been put to practical use as a device as shown in FIG. 3 (Japanese Patent Publication No. 48-30293, Japanese Utility Model Publication 48-81543, Japanese Utility Model Publication No. 51-17936, etc.).

That is, these airbag fabrics are
When a collision accident occurs in an aircraft or an automobile, current flows through the power cord H of the inflator F as shown in FIG.
When the inflator burns and the airbag A1 expands into a spherical shape, it is designed to withstand the high temperature blast and flame ejected from the combustion gas injection port G.

However, in order to pass the safety standard, the conventional airbag is covered with elastomer such as chloroprene rubber with a considerably high basis weight, which makes the airbag heavy and coarse and rigid during sewing. In addition to significantly reducing the handleability, the volume when folded is large, which is an obstacle to mounting on a vehicle.

Further, there is a problem that high-temperature combustion gas is easily blown to the outside air at a burst from a pair of holes having a diameter of about 30 mm called vent holes provided in the airbag.

In order to solve this problem, the present inventors have
Lightweight and thin, it can be compactly stored in the steering wheel, withstands the high temperature blast and flames ejected from the inflator in the event of a collision, does not require vent holes, does not worry about burns, airbag fabric Was first proposed (Japanese Patent Application No. 3-45328).

In this application, the fabric (F2) used for the steering side, that is, the vent cloth, effectively acts as a vent hole, and therefore has a high air permeability (2.5 to 7.0 cc / cm ² /). sec / 0.5inc
hAq), and fine particles or smoke generated during inflation may diffuse outside the air bag and contaminate the inside of the vehicle.

In order to prevent such vehicle interior pollution, an air bag provided with a filter having an area of 500 to 10,000 cm ² for purifying driving gas has been proposed (Japanese Patent Laid-Open No. 63-170147).

The filter described in JP-A-63-170147 is made of spun yarn, and there is a possibility that the high tenacity inherent in the fiber may not be fully utilized. Also,
Curve L = 0.05 + 0.075P and L = 1.2 + 0.6
Air permeability L (l / c in the range surrounded by P and
m ² / min). The air permeability in this range is approximately 2.4 to 32.7 c when converted to Frazier air permeability.
It is c / cm ² /sec/0.5 inchAq, and this air permeability is not sufficient for filtering fine particles.

[0010]

The present invention is of high strength,
Fine particles and smoke generated during inflation can be effectively filtered without worrying about burns, and vent vents that do not require vent holes, and lightweight using this,
The purpose is to provide an air bag that is compact and has excellent storability.

[0011]

The present invention is directed to a single yarn fineness of 2d.
e or less, strength 16 g / de or more, average fiber length 10 to 80
cm, the thermal decomposition temperature of 300 ℃ or more weaving using a yarn containing high-strength heat-resistant fiber, the cover factor, the fiber filling rate and the Frazier air permeability in the following range, a vent cloth. 1,700 ≤ cover factor ≤ 3,000 0.3 ≤ fiber filling rate ≤ 0.8 0.2 ≤ Frazier air permeability ≤ 4.0 (cc / cm ² / s)
ec / 0.5inchAq)

The present invention also provides an air bag using the vent cloth on the entire bottom surface or a part thereof.

The high-strength heat resistant fiber in the present invention means a fiber having a strength of 16 g / de or more and a thermal decomposition temperature of 300 ° C. or more. 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 formed into a woven fabric, so that the airbag is often damaged during inflation. Particularly in the case of a fiber yarn containing thermoplastic synthetic fibers, the strength of the heat resistant fibers is 16 g /
De or more is required, and strength of 18 g / de or more is preferable.

The thermal decomposition temperature of the high strength heat resistant fiber is 300 ° C.
The above is necessary. If the temperature is less than 300 ° C, the strength is 16
Even if it is more than g / de, the airbag is often damaged during inflation. Therefore, the thermal decomposition temperature of the high-strength heat-resistant fiber needs to be 300 ° C. or higher, and 350 ° C. or higher is even better.

Examples of the high-strength heat-resistant fiber include, for example, meta-type or para-type wholly aromatic polyamide fiber (aramid fiber), specifically, polymetaphenylene isophthalamide fiber, polyparaphenylene terephthalamide fiber, para-type aramid. And meta-aramid copolymer fiber, para ether aramid fiber obtained by copolymerizing aromatic ether such as 3,4'-diaminodiphenyl ether, polyparaphenylene sulfone fiber, polyparaphenylene sulfide fiber, wholly aromatic polyester Fiber, polyimide fiber, polyetherimide fiber, polyetheretherketone fiber, etc., or a mixed fiber thereof.

Of these, polyparaphenylene terephthalamide fiber (Kevlar fiber: manufactured by Dyupon) and 3,4 '
-A para-aramid fiber copolymerized with diaminodiphenyl ether (Technora fiber: manufactured by Teijin Ltd.) is particularly preferable.

An air bag using a vent cloth made of a woven fabric containing such high-strength heat-resistant fibers does not melt or break up against a high temperature blast or flame ejected from an inflator.

The single yarn fineness of the high strength heat resistant fiber must be 2 de or less. Originally, it is extremely important that the air bag is flexible because it needs to be folded small. 2de
If it exceeds, the air bag obtained becomes extremely rigid. Further, since the number of fibers forming the yarn is small and the fiber gap is wide, the air permeability of the woven fabric is large. It will not be able to sufficiently block the high temperature blast and flame ejected from the inflator. Furthermore, the single yarn fineness is small,
The larger the number of constituent fibers is, the higher the flame resistance is. From this point as well, the single yarn fineness of the high-strength heat-resistant fiber is required to be 2 de or less.

The high strength heat resistant fiber has an average fiber length of 10 to 10.
80 cm is preferred. If the average fiber length is less than 10 cm, the tenacity is insufficient. On the other hand, if it exceeds 80 cm, the number of fluffs on the yarn is reduced and the filtration area is reduced, which reduces the filtration efficiency of the fine particles, which is not preferable. A preferred average fiber length is 20 to 70 cm.

The fiber yarn containing the high-strength heat-resistant fiber in the present invention is preferably a fiber in which thermoplastic synthetic fibers are mixed in the order of single fibers. The thermoplastic synthetic fiber is a fiber made of a normal thermoplastic synthetic resin, and examples thereof include polyester fiber, nylon fiber, acrylic fiber, polypropylene fiber, and the like. Among them, polyester fiber is preferable in terms of heat resistance and strength. ..

The single-fiber fineness of the thermoplastic synthetic fiber is the same as that of the high-strength heat-resistant fiber, and when the single-fiber fineness is large, the number of fibers constituting the yarn is small and it is difficult to obtain a uniform mixed fiber. It is preferably 5 de or less, and particularly preferably 2.5 de or less.

The Young's modulus of the thermoplastic synthetic fiber is
1,300 kg / mm ² or less, especially 1,200 kg / m
It is preferably m ² or less. Young's modulus is 1,300 kg / mm
^When it exceeds ² , the high-strength heat-resistant fiber which is another component has a high Young's modulus, so that the Young's modulus of the yarn after mixing is too high, and the resulting bent cloth becomes coarse and rigid, which is not preferable.

The average fiber length of the thermoplastic synthetic fiber is
For the same reason as the high strength heat resistant fiber, it is preferably 10 to 80 cm, and particularly preferably 20 to 70 cm.

The mixing ratio of thermoplastic synthetic fibers is 40 to 90.
%, Especially 50 to 80% by weight is preferred. If the blending ratio of the thermoplastic synthetic fiber is less than 40% by weight, the vent cloth becomes coarse and rigid, while if it exceeds 90% by weight, the heat resistance of the vent cloth is lowered. In addition, unless the thickness of the yarn is considerably thick, sufficient strength cannot be obtained, and the thickness of the vent cloth becomes thick, which is not preferable.

The cover factor of the woven fabric in the present invention means the sum of the product of the square root of the yarn fineness and the number of yarns per inch and the weft. If the cover factor is less than 1,700, the high temperature blast and flame ejected from the inflator cannot be sufficiently blocked. On the other hand, when it exceeds 3,000, the flexibility of the woven fabric is lost, and the obtained vent cloth becomes extremely rough and rigid. Therefore, the cover factor is 1,700 to 3,000, preferably 2,000 to
2,700.

The fiber filling rate of the woven fabric in the present invention means a value obtained by dividing the bulk specific gravity of the woven fabric by the true specific gravity. When the fiber filling rate is less than 0.3, the hiding effect as a woven fabric is low, and it becomes impossible to sufficiently block high-temperature fine particles and smoke ejected from the inflator. On the other hand, when it exceeds 0.8, the flexibility of the woven fabric is lost, and the obtained vent cloth becomes extremely film-like. Therefore, the fiber filling rate is 0.3-
0.8, preferably 0.4 to 0.7.

The fiber filling rate can be determined by the single yarn fineness, average fiber length, fineness, weaving density, refining conditions, calendering conditions and the like.

The Frazier air permeability in the present invention means
The flow rate of air at 20 ° C passing through the cloth per unit area and unit time when measured at a water column pressure of 0.5 inch. If the Frazier air permeability is less than 0.2, the bag internal pressure rises excessively, which is not preferable. On the other hand, when it exceeds 4.0, the filtration effect becomes insufficient. Therefore, the Frazier air permeability is 0.2 to 4.0 cc / cm ² /sec/0.5 inch.
Aq, preferably 0.3 to 3.0 cc / cm ² / sec
/0.5 inchAq, particularly preferably 0.4 to 2.4
cc / cm ² /sec/0.5 inchAq.

An air bag using a vent cloth having such a low air permeability can completely filter the stimulating fine particles ejected from the inflator and prevent the fine particles and smoke from being diffused and contaminating the inside of the vehicle. .. Further, even such a vent cloth having a low air permeability can be sufficiently replaced with the vent hole by widening the use area, that is, by using it on the entire bottom surface of the airbag.

The Frazier air permeability in the present invention can be determined by weaving density, scouring conditions, calendering conditions and the like.

The cover factor, the fiber filling rate and the Frazier air permeability in the present invention are important factors that determine the performance of the vent cloth for an air bag. By satisfying the above-mentioned values together, high temperature fine particles ejected from the inflator and It is possible to effectively filter smoke and obtain a flexible and compact air bag vent cloth without vent holes.

The yarn in the present invention is preferably made of a stretch-spun spun yarn by a stretch-cutting method. The stretch-spun spun yarn has fluff and the like in the yarn form, and the fibers are randomized. Therefore, compared with continuous filaments, it is possible to reduce the woven tissue gap to reduce the Frazier air permeability, and to increase the surface of fine particle collision fibers. Therefore, the filtration effect is increased, which is extremely suitable for the vent cloth of the present invention.

Next, an example of a method for producing a stretch-cut spun yarn of high-strength heat-resistant fiber will be described with reference to the drawings.

FIG. 1 shows a fiber mixing device. The high-strength heat-resistant fiber passes through the supply nip roller while being aligned and stacked in front of the supply nip roller 1, and then the shooter 2
At the same time, it is torn off by the drafting nip roller 3 and drafted uniformly while drafting. Then, it is torn off from the drafting roller by the suction air nozzle 4, then imparted to the tying property by the swirling tying nozzle 5 by entanglement and fluff winding, and then torn off by the delivery roller 6, and the fluff of short fibers is bundled. The yarn 7 is randomly wound on the side surface.

After appropriately twisting the obtained yarn, this is warped,
It is desirable that the weft yarn is woven at a desired density, scoured, heat-set, and relaxed, and then calendered on at least one side.

The yarn used for weaving is 200 to 400 de
Is preferred. If it is less than 200 de, sufficient vent cloth strength cannot be obtained. On the other hand, when it exceeds 400 de, it is not suitable for obtaining a lighter weight vent cloth, and the weight and volume of the bag increase. In addition, the texture also deteriorates. It is more preferable that the yarn is a twin yarn of 200 to 300 de, or 100 to 150 de in terms of weavability and filterability.

From the viewpoint of compactness and filterability, the woven structure is preferably 1/1 plain woven fabric, 2/1 twill woven fabric or 2/2 twill woven fabric.

The weaving density of the yarn is, for example, 300 de
Then, it is preferable to set it to 55 to 90 lines / inch. 5
If it is less than 5 lines / inch, a preferable cover factor cannot be obtained and the strength is insufficient. On the other hand, if it exceeds 90 yarns / inch, weaving becomes difficult and the quality of the woven fabric deteriorates. Regarding the weaving density, it is preferable that the warp and weft are arbitrarily increased or decreased according to the warp tension of the loom. Generally, good air permeability can be obtained by slightly increasing the warp density.

The calendar processing is performed by forming a pair of upper and lower metals /
Preference is given to working with elastic roller calenders or metal / metal roller calenders. The condition at this time is that the surface temperature of the metal roller is 150 to 250.
The temperature and the pressure are preferably about 100 to 500 kg / cm.
The speed is preferably 3 to 30 m / min. To achieve a sufficient hot pressing effect, it is desirable to preheat the fabric or process it at a low speed.

The fiber filling rate can be adjusted by calendering, thereby reducing the Frazier air permeability. In particular, in a vent cloth obtained by weaving a yarn in which polyester fibers are mixed as a thermoplastic synthetic fiber, the polyester fiber is set in a state of being thermally contracted and deformed by the heat pressure of calendering, so that the Frazier air permeability can be increased. Can be controlled to be lower and uniform, and an excellent vent cloth with no change in air permeability over time can be obtained.

The vent cloth of the present invention thus obtained is used for a part or the whole of the fabric on the steering side of an air bag as shown in FIG. 2, and it is possible to remove fine particles and fine particles generated during inflation of high temperature gas. The smoke can be effectively filtered and the inside of the vehicle can be prevented from being polluted by the diffusion of these fine particles and smoke.

Further, the vent cloth of the present invention is flexible and excellent in foldability, and can be folded compactly.
It is lightweight, does not require vent holes, has no risk of burns, and has heat resistance and strength to withstand high temperature blast and flame.

An air bag can be made by sewing two circular fabrics along the circumference of the fabric as shown in FIG. 2, and when the air bag is made, one of them is on the human body side. (Hereinafter referred to as the top surface), on the opposite side 1
The sheet is located on the steering side (hereinafter referred to as the bottom surface). The vent cloth of the present invention constitutes a part or the whole of the bottom surface. In a vent cloth having a small Frazier air permeability, by using it on the entire bottom surface, it is possible to effectively discharge high temperature gas out of the bag while filtering fine particles.

The woven fabric which is sewn together with the vent cloth of the present invention and constitutes the human body side is not particularly limited, and a known woven fabric for an air bag can be used.

As the combination of the fabrics constituting such an air bag, a combination using the silicone rubber-coated polyester fabric on the entire top surface and the vent cloth of the present invention on the entire bottom surface, and the silicone rubber-coated nylon 66 fabric on the entire top surface. In addition, a combination of using the vent cloth of the present invention on the entire bottom surface, a combination of using chloroprene rubber-coated nylon 66 woven fabric on the entire top surface, and a combination of using the vent cloth of the present invention on the entire bottom surface can be mentioned.

Of these, a combination in which the silicone rubber-coated polyester fabric is used on the entire top surface and the vent cloth of the present invention is used on the entire bottom surface is preferable.

The silicone rubber-coated polyester fabric has excellent heat resistance and can be made more compact than conventional fabrics, and therefore can be suitably used as a fabric for the top surface of an air bag.

As the polyester woven fabric, high tenacity polyester fiber of 8 g / de or more is preferable, but 8.3 to 10 g / de is obtained after drawing an unstretched fiber having an intrinsic viscosity of 0.8 or more and Δn of 0.007 or less. , High toughness polyester fiber with elongation of 18 to 27% (fineness of 200 to 500 de)
A woven fabric obtained by weaving is particularly preferable. Among these, polyester woven fabrics having a single yarn fineness of 2 de or less are more preferable.

As the silicone rubber, a coating obtained by coating an addition reaction type silicone rubber diluted with a solvent with a catalyst and curing it is preferable.

The silicone rubber is preferably applied at 20 to 60 g / m ² , particularly preferably 30 to 50 g / m ² . If the coating amount of silicone rubber is less than 20 g / m ² , the heat resistance will be insufficient. On the other hand, if it exceeds 60 g / m ² , the texture is coarse and rigid due to the high basis weight, which makes it impossible to achieve lightweight and compactness.

Another preferable combination is an air bag using a silicone rubber-coated nylon 66 woven fabric on the entire top surface and the vent cloth of the present invention on the entire bottom surface.

The silicone rubber coated nylon 66 fabric is
Since it has excellent heat resistance and impact resistance, it can be suitably used as a fabric for the top surface of an air bag.

Nylon 66 fabric has a strength of 8 to 10
g / de, elongation 18 to 28%, fineness 200 to 500 de
Woven fabrics of fibers are preferred.

As the silicone rubber, those mentioned above can be mentioned.

The silicone rubber is preferably applied at 20 to 60 g / m ² , particularly preferably 30 to 50 g / m ² . If the coating amount of silicone rubber is less than 20 g / m ² , the heat resistance will be insufficient. On the other hand, if it exceeds 60 g / m ² , a high basis weight results in a rough and rough texture, resulting in poor lightness and compactness.

The air bag obtained by sewing and joining the vent cloth of the present invention and such a silicone rubber coated fabric is excellent in storability because the top surface and the bottom surface are lighter and thinner than conventional air bags. The bag is compact and excellent in strength, and can be a safe bag that takes advantage of the heat resistance, cold resistance and flexibility of silicon. Further, it is possible to effectively filter fine particles to form a clean bag free from the risk of burns.

Furthermore, by using the vent cloth of the present invention on the entire bottom surface and using the chloroprene rubber-coated nylon 66 fabric on the entire top surface, a lightweight and strong bag can be obtained.

In this case, as the chloroprene rubber, an ordinary metal oxide vulcanization type rubber is preferable. The adhesion amount of chloroprene rubber is preferably 70 to 170 g / m ² , and particularly preferably 100 to 150 g / m ² . If the adhered amount of chloroprene rubber is less than 70 g / m ² , the heat resistance becomes insufficient, while if it exceeds 170 g / m ² , it becomes coarse and rigid due to high basis weight.

In the air bag of the present invention, the woven fabric constituting the apron portion is excellent in heat resistance because it protects the air bag body from the high temperature gas ejected from the inflator, and the air bag is liable to have a large pressure applied to the clamp portion of the air bag. A woven fabric having excellent strength is desirable in order to protect the main body from damage, but the woven fabric having such characteristics is not particularly limited. For example, a woven fabric obtained by weaving the same yarn as that forming the vent cloth, the same silicone rubber-coated polyester woven fabric or nylon 66 woven fabric used for the top surface, or chloroprene rubber-coated nylon 66.
A woven fabric can be preferably mentioned.

The number of aprons may be any, but if the number of laminated aprons is too large, the foldability deteriorates. The preferred number is 1
It is 4 sheets, and 2-3 sheets are more preferable.

As the structure of the apron, it is preferable to dispose a woven fabric excellent in strength and heat resistance on the inner surface side of the bag which is in direct contact with the gas from the inflator. The innermost apron is particularly preferably a silicone rubber-coated polyester woven fabric or nylon 66 woven fabric or a chloroprene rubber-rubber coated nylon 66 woven fabric, and more preferably laminated so that the coated surface is inside the bag surface.

These aprons are preferably bonded to both sides of the vent cloth. By joining in this way, the vent cloth is completely protected on both sides by the apron, and the burst strength is increased.

The apron is preferably joined with the vent cloth and its woven fabric in the same weft and weft direction. By joining in this manner, stress can be received together with the vent cloth during inflation, and the reinforcing effect of the apron can be improved.

Further, it is desirable that the several aprons and the apron and the vent cloth are bonded by a synthetic resin adhesive. Adhesive joining can prevent the vent cloth from being damaged during inflation due to stress concentration on weak portions such as perforations of the sewn portion.

Examples of the synthetic resin adhesive include thermoplastic adhesives such as polyamide, polyester and polyolefin, and thermosetting adhesives such as chloroprene rubber, silicone rubber, epoxy resin and urethane resin. Among them, a thermoplastic adhesive is preferable from the viewpoint of workability, and a copolyamide adhesive and / or a copolyester adhesive is particularly preferable. In particular, when the vent cloth and apron are composed of aromatic polyamide fibers as the high-strength and heat-resistant fibers, a copolyamide adhesive is used, and when these fabrics contain polyester fibers, a co-polyamide adhesive is used. Polymerized polyamide-based adhesives and / or copolymerized polyester-based adhesives exhibit high adhesion and are preferable.

Further, these adhesives preferably have a film-like or non-woven-like form. Among them, the non-woven fabric-like adhesive is particularly preferable because it can follow the shapes of the apron and the vent cloth well and has good workability and can exhibit a strong adhesive force when forming the air bag.

The air bag of the present invention using the vent cloth can effectively filter fine particles and smoke generated during inflation and prevent the interior of the vehicle from being contaminated by the diffusion of these fine particles and smoke. it can.

Further, the air bag of the present invention is thinner, more flexible and excellent in foldability than conventional air bags, can be folded in a compact size, is light in weight, and does not require a vent hole. It has no heat resistance, high heat resistance and strength to withstand high temperature blasts and flames, and has excellent effects such as low impact and scratch resistance during deployment and no damage.

[0069]

EXAMPLES The present invention will be described in more detail with reference to examples. The evaluation items in the examples were evaluated according to the following methods. Tensile strength : Measured by the strip method of JIS L-1096 (evaluated by the average value of the background). Frazier Air Permeability : Measured by the Frazier method of JIS L-1096. Storability : The airbag before being subjected to the inflation test is folded along the dotted line E shown in FIGS. 4 (a) and 4 (b) into the shape shown in FIG. 5 (c).
A load W of g was applied to measure the thickness t.

Inflation : An air bag was attached to a device as shown in FIG. 3, and a type 4 inflator manufactured by Morton International Co., Ltd. was used to obtain 95 ° C.
It was carried out in. (Filterability ): An air bag was prepared as described in Example 4, and the filterability was observed by observing the amount of white smoke ejected outside the bag when the air bag was deployed and the amount of black fine particles adhering to the inside of the vent cloth. Was evaluated. (Resistance) : Evaluation was made based on whether or not the airbag was damaged. (Proper internal pressure) : ○ when the peak value of the internal pressure of the bag is about 0.25 to 0.35 kg / cm ² G when the bag is deployed,
The case where it deviated from this was marked as x.

Example 1 Using the apparatus shown in FIG. 1, a polyester fiber having a single yarn fineness of 1.3 denier, a strength of 7.5 g / de, a Young's modulus of 116 g / de, and a total fineness of 3,900 de [Tetron: Teijin Ltd. )], Single yarn fineness 0.75 de, strength 28 g / d
e, a para-aromatic polyamide fiber having a total fineness of 2,000 de (Technora: manufactured by Teijin Ltd.) is overlaid and aligned, and the distance between the rollers (sliding length) is 150 cm. It was torn off at a speed of 300 m / min at a speed of about 19.7 times between the and the drafting roller 3 to form a thin single fiber bundle. In succession, the speed ratio between the drafting nip roller 3 and the delivery roller 6 is 100:
The fiber was passed through at 98 to impart entanglement, and at the same time, fluff of single fiber was randomly wound around the side surface of the fiber bundle to obtain a yarn 7 of 300 de.

The ratio of the polyester fiber and the para-aromatic polyamide fiber of the obtained yarn was 66:34. The average fiber length of these yarns is 5 for polyester fiber.
It was 3 cm and the para aromatic polyamide fiber was 45 cm. The strength and elongation of this yarn is 8.5 g / de,
It was 4.4% (measured after twisting 300 T / m in each case). This yarn is then twisted at 250 T / m and warped to 70
This was woven into a 1/1 plain weave with a woven density of books / inch and weft of 64 threads / inch, and was scoured and heat set. Next, using a pair of metal / elastic calendar rollers having a metal roller surface temperature of 160 ° C., a linear pressure of 210 kg / cm and a speed of 10 m.
Vent cloth was obtained by subjecting one side to a hot pressing process at a speed of 1 / min. The obtained vent cloth has a cover factor of 2,321,
The fiber packing rate was 0.58.

Tensile strength of the obtained vent cloth,
Frazier air permeability was examined, an air bag as shown in FIG. 2 was prepared, an inflation test was conducted, and filterability was examined. The results are shown in Table 1. Generation of white smoke during inflation was extremely small, and the amount of fine particles adhering to the inside of the vent cloth after inflation was extremely large, indicating good filterability.

Example 2 A 200 de yarn having a polyester fiber / para-aromatic polyamide fiber ratio of 57:43 was obtained in the same manner as in Example 1 except that the draft length was 100 cm. The average fiber length was 38 cm for the polyester fiber and 33 cm for the para aromatic polyamide fiber. The yarn elongations are 8.0 g / de and 4.3% (370% for each case).
T / m was measured after twisting). Next, add 300 to this thread
T / m was twisted and woven into a 2/1 twill weave with a warp density of 91 warps / inch and weft 78 threads / inch, and scouring and heat setting were performed. Next, the metal roller surface temperature is 160 ℃
Linear pressure of 1 using a pair of metal / elastic calendar rollers
Vent cloth was obtained by subjecting one side to hot pressing at 80 kg / cm and a speed of 7 m / min. The obtained vent cloth had a cover factor of 2,390 and a fiber filling rate of 0.54.

Tensile strength of the obtained vent cloth,
Frazier air permeability and filterability were examined. The results are shown in Table 1. Very little white smoke is generated during inflation,
In addition, the amount of fine particles adhering to the inside of the vent cloth after inflation was extremely large, indicating good filterability.

Example 3 In the same manner as in Example 1, with a draft length of 150 cm, 130 d
The para-aromatic polyamide fiber of e obtained a stretch-breaking yarn of 100%. The average fiber length of the yarn was 47 cm. The strength and elongation of the yarn were 25 g / de and 4.2% (measured after twisting 450 T / m in each case). Next, this yarn is twisted at 380 T / m and the warp is 95 yarns / inch, weft 9
It was woven into a 1/1 plain weave with a weave density of 0 yarns / inch, and subjected to scouring and heat setting. Next, using a pair of metal / elastic calender rollers having a metal roller surface temperature of 160 ° C., one side was subjected to hot pressing at a linear pressure of 200 kg / cm and a speed of 9 m / min to obtain a vent cloth. The obtained vent cloth had a cover factor of 2,110 and a fiber packing ratio of 0.1.
It was 53.

Tensile strength of the obtained vent cloth,
Frazier air permeability and filterability were examined. The results are shown in Table 1. Very little white smoke is generated during inflation,
In addition, the amount of fine particles adhering to the inside of the vent cloth after inflation was extremely large, indicating good filterability.

Comparative Example 1 The same as in Example 1, the ratio of the polyester fiber to the para aromatic polyamide fiber was 300 de, which was 66:34.
Was obtained. The average fiber length was 53 cm for the polyester fiber and 45 cm for the para aromatic polyamide fiber. In addition, the toughness of the yarn is 8.5 g / de,
It was 4.4% (measured after twisting 300 T / m in each case). This yarn is then twisted at 250 T / m and warped to 50
This was woven into a 1/1 plain weave with a weaving density of 45 yarns / inch and 45 wefts / inch, and subjected to scouring and heat setting. Next, using a pair of metal / elastic calendar rollers having a metal roller surface temperature of 160 ° C., a linear pressure of 210 kg / cm and a speed of 10 m.
Vent cloth was obtained by subjecting one side to a hot pressing process at a speed of 1 / min. The obtained vent cloth has a cover factor of 1,645,
The fiber packing rate was 0.41.

Tensile strength of the obtained bent cloth,
Frazier air permeability and filterability were examined. The results are shown in Table 1. The amount of white smoke generated during inflation was relatively large, and the amount of fine particles adhering to the inside of the vent cloth after inflation was small, resulting in insufficient filterability.

Comparative Example 2 The same as in Example 2, the ratio of polyester fiber to para aromatic polyamide fiber was 57:43, 200 de.
Was obtained. The average fiber length was 38 cm for the polyester fiber and 33 cm for the para aromatic polyamide fiber. In addition, the toughness of the yarn is 8.0 g / de,
It was 4.3% (measured after twisting 370 T / m in each case). Next, twist 300 T / m to this yarn and warp 1
It was woven into a 1/1 plain weave with a weaving density of 20 yarns / inch and weft 81 yarns / inch, and was scoured and heat set. Next, using a pair of metal / elastic calender rollers having a metal roller surface temperature of 180 ° C., a linear pressure of 400 kg / cm and a speed of 5
Bent cloth was obtained by subjecting one side to hot pressing at m / min.
The obtained vent cloth has a cover factor of 2,84.
0, and the fiber filling rate was 0.84.

Tensile strength of the obtained bent cloth,
Frazier air permeability and filterability were examined. The results are shown in Table 1. Very little white smoke is generated during inflation,
Further, the amount of fine particles adhering to the inside of the vent cloth after inflation was large and the filterability was good, but the bag internal pressure was too high, and therefore vent crossing was unsatisfactory.

Comparative Example 3 Para-aromatic polyamide fiber having a single yarn fineness of 1.5 de and a strength of 22 g / de [Kevlar 29, manufactured by Deupon Co.] 1
A 200 de spun yarn was obtained using 00%. The average fiber length of the obtained yarn was 3.7 cm. Also, the strength and elongation of this yarn is 9.5 g / de, 3.8% (both 300 T
/ M after twisting). Then, add 200
A T / m twist was applied to create a twin yarn (200/2), which was woven into a 2/1 twill weave with a warp density of 66 warps / inch and weft 55 threads / inch, and subjected to scouring and heat setting. .. Next, using a pair of metal / elastic calender rollers having a metal roller surface temperature of 160 ° C., a linear pressure of 210 kg / cm and a speed of 1
Bent cloth was obtained by subjecting one side to hot pressing at 0 m / min. The obtained vent cloth has a cover factor of 2,4.
20, the fiber filling rate was 0.41.

Tensile strength of the obtained bent cloth,
Frazier air permeability and filterability were examined. The results are shown in Table 1. The amount of white smoke generated during inflation was extremely large, and the amount of fine particles adhering to the inside of the vent cloth after inflation was very small, resulting in extremely poor filterability.

Comparative Example 4 Polyester fiber similar to that used in Example 1 (Tetoron, manufactured by Teijin Ltd.) and a para-aromatic polyamide having a single yarn fineness of 1.5 de and a strength of 22 g / de (Kevlar 29, manufactured by Dyupon Co., Ltd.) ] Was spun into a spun yarn of 300 de. The ratio of the polyester fiber and the para aromatic polyamide fiber of the obtained yarn was 66:34. The average fiber length of the yarn was 3.7 cm. The strength and elongation of this yarn are 4.0 g / de and 3.9%, respectively (300 T /
m was measured after twisting. Next, 250T on this yarn
/ M was twisted and woven into a 1/1 plain weave with a warp density of 70 warps / inch and weft 64 threads / inch, and scouring and heat setting were performed. Next, using a pair of metal / elastic calender rollers having a metal roller surface temperature of 160 ° C., a linear pressure of 21
Vent cloth was obtained by subjecting one side to hot pressing at 0 kg / cm and a speed of 10 m / min. The obtained vent cloth had a cover factor of 2,276 and a fiber filling rate of 0.51.

Tensile strength of the obtained bent cloth,
Frazier air permeability was examined. The results are shown in Table 1. The bag ruptured during inflation and generated a large amount of smoke. That is, the strength of the vent cloth was insufficient. Therefore, the filterability of the vent cloth could not be evaluated.

[0086]

[Table 1]

Examples 4 to 6 Weaving a filament made of polyester fiber [Tetron, Teijin Ltd.] having a single yarn fineness of 1.7 de, a strength of 9 g / de, an elongation of 21% and a total fineness of 420 de, and weaving 1/1 To obtain a plain weave. The woven densities after scouring, heat setting and calendering were warp 48 yarns / inch and weft 47 yarns / inch. Next, silicone rubber [Toray Dow Corning Silicon Co., Ltd.
One side of the obtained woven fabric was coated to obtain a silicone rubber-coated polyester woven fabric. The amount of silicone rubber deposited was 40 g / m ² , and the total basis weight was 230 g / m ² .

The obtained silicone rubber-coated polyester woven fabric and the vent cloths obtained in Examples 1 to 3 were cut into a circular shape and cut along the circumference, and the entire top surface as shown in FIG. Airbags made of rubber-coated polyester woven fabric and vent cloth all over the bottom surface were prepared. Neither vent hole was created. As the apron, in each case, one piece of silicone rubber coated polyester fabric is placed on the innermost side of the bag, and two pieces of the same fabric as the vent cloth are respectively attached with a copolyester type nonwoven fabric adhesive so as to sandwich the vent cloth from the inside and outside of the vent cloth. Adhesively bonded. The obtained airbags all had an internal volume of 60 liters.

The storability of the obtained air bag was examined and an inflation test was conducted. The results are shown in Table 2.

Comparative Example 5 An air bag was prepared in the same manner as in Example 4 except that the vent cloth obtained in Comparative Example 1 was used instead of the vent cloth obtained in Example 1. , The storability was checked, and an inflation test was conducted.
The results are shown in Table 2. Due to insufficient filterability of the vent cloth, the air bag had a poor overall reputation.

Comparative Example 6 An air bag was prepared in the same manner as in Example 4 except that the vent cloth obtained in Comparative Example 2 was used instead of the vent cloth obtained in Example 1. , The storability was checked, and an inflation test was conducted.
The results are shown in Table 2. Since the vent cloth has low air permeability, the internal pressure of the bag increased too much, resulting in a poor overall rating.

Comparative Example 7 An air bag was prepared in the same manner as in Example 4 except that the vent cloth obtained in Comparative Example 3 was used instead of the vent cloth obtained in Example 1. , The storability was checked, and an inflation test was conducted.
The results are shown in Table 2. Since the vent cloth had too large air permeability, the filterability was insufficient, and the internal pressure of the bag did not rise sufficiently, so that the air bag had a poor general reputation.

Comparative Example 8 An air bag was prepared in the same manner as in Example 4 except that the vent cloth obtained in Comparative Example 4 was used instead of the vent cloth obtained in Example 1. , The storability was checked, and an inflation test was conducted.
The results are shown in Table 2. The bag burst during inflation, and the filterability and internal pressure could not be evaluated.

Examples 7 to 9 Using a filament made of nylon 66 fiber having a single yarn fineness of 3 de, a strength of 9 g / de, an elongation of 22% and a total fineness of 420 de, the same as the silicone rubber coated polyester woven fabric used in Example 4 was used. Specifications silicone rubber coated nylon 66
Fabric was created.

Airbags were prepared in the same manner as in Examples 4 to 6 except that the obtained silicone rubber-coated nylon 66 woven fabric was used instead of the silicone rubber-coated polyester woven fabric. The storability of each of the obtained air bags was examined and inflation was performed. The results are shown in Table 2.

Example 10 Using a filament made of nylon 66 fiber having a single yarn fineness of 3 de, a strength of 9 g / de, an elongation of 22% and a total fineness of 420 de, the same specifications as the silicone rubber coated polyester fabric used in Example 4 were obtained. A chloroprene rubber-coated nylon 66 fabric was created. Chloroprene rubber adhesion amount is 12
It was 0 g / m ² and the total areal weight was 310 g / m ² . Using the obtained chloroprene rubber-coated nylon 66 woven fabric, the storability was examined in the same manner as in Example 7, and inflation was performed. The results are shown in Table 2.

Comparative Example 9 A filament made of nylon 66 fiber having a single yarn fineness of 6 de, a strength of 9 g / de, an elongation of 22% and a total fineness of 840 de was used, and a chloroprene rubber coat of 25 warps / inch and 25 wefts / inch was obtained. A nylon 66 fabric was created. The resulting chloroprene rubber-coated nylon 66 woven fabric was used on the entire top surface and bottom surface to obtain an air bag. The size of the air bag was 60 l as in Example 4. However, two vent holes of 28 mmφ were formed on the bottom surface. The storability of the obtained air bag was examined and an inflation test was conducted.

As a result, a large amount of white smoke was ejected from the vent hole during inflation. Also, there is little adhesion of fine particles inside the airbag after inflation,
It was found that the particles were almost jetted out of the bag, and the filterability was found to be very poor. In addition, the weight of the air bag was large and the storability was poor.

[0099]

[Table 2]

[0100]

INDUSTRIAL APPLICABILITY The present invention can provide a vent cloth that has an excellent filter effect and does not require vent holes, and an air bag using the vent cloth that is lightweight and has a compact storability.

[Brief description of drawings]

FIG. 1 is a side view of a check-and-break spinning device according to the check-and-break method.

[Fig. 2] (a) Schematic diagram of airbag (front view: top surface) (b) Schematic diagram of airbag (cross-sectional view: bottom surface)

FIG. 3 is a schematic view of an airbag device.

FIG. 4 (a) Schematic view showing how to fold the air bag during storage evaluation (before folding) (b) Schematic showing how to fold air bag during storage performance evaluation (after folding) (c) ) Perspective view of the airbag after folding

FIG. 5: Method for measuring the thickness of the airbag after folding

[Explanation of symbols]

1 Supply Nip Roller 2 Shooter 3 Checking Nip Roller 4 Suction Air Nozzle 5 Swirling Conjugation Nozzle 6 Delivery Roller 7 Thread A1 Airbag B Inflator Insertion Hole C1 Vent Cross C2 Airbag Bottom (Steering Side) Air Top cross of the bag body (human body side) D Apron E Folding line W Load weight t Thickness of air bag after folding F Inflator G Combustion gas injection port H Power cord I Case A1 'Air when expanded (inflated) bag

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI Technical display location D04H 1/42 T 7199-3B R 7199-3B

Claims (11)

[Claims] 1. A single yarn fineness of 2 de or less and a strength of 16 g / de
Above, average fiber length 10 to 80 cm, thermal decomposition temperature 300 ℃
A vent cloth characterized by having a cover factor, a fiber filling rate, and a Frazier air permeability in the following ranges, which is woven using a yarn containing the above high-strength heat-resistant fiber. 1,700 ≤ cover factor ≤ 3,000 0.3 ≤ fiber packing rate ≤ 0.8 0.2 ≤ Frazier air permeability ≤ 4.0 (cc / cm ² / s)
ec / 0.5inchAq) 2. The vent cloth according to claim 1, wherein the high-strength heat resistant fiber is a para-aromatic polyamide fiber. 3. A single yarn fineness of 5 de or less, average fiber length of 10 to 80 cm, and Young's modulus of 1,300 kg / mm ² or less 40 to 90% by weight of thermoplastic synthetic fibers are mixed. Item 1. The vent cloth according to item 1 or 2. 4. The vent cloth according to claim 3, wherein the thermoplastic synthetic fiber is a polyester fiber. 5. The bent cloth according to claim 1, wherein the yarn is a stretch-cut spun yarn according to a stretch-break method. 6. The fiber yarn as described in any one of claims 1 to 5, which is a fiber yarn obtained by tearing a fiber between a supply roller and a drafting roller while preventing the fiber from being disturbed, and then tying it with an air nozzle. Bent cloth according to item 1. 7. The vent cloth according to claim 1, wherein at least one surface thereof is calendered. 8. An air bag using the vent cloth according to claim 1 on the entire bottom surface. 9. The airbag according to claim 8, wherein a silicone rubber-coated polyester fabric is used on the entire top surface. 10. The airbag according to claim 8, wherein a silicone rubber-coated nylon 66 woven fabric is used on the entire top surface. 11. A chloroprene rubber-coated nylon 66.
The airbag according to claim 8, wherein the woven fabric is used on the entire top surface.