JP2003301349A - Base fabric for air bag and air bag using same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base fabric for an air bag having ≤1.2 cm<SP>3</SP>/sec/cm<SP>2</SP>quantity of air flow under 1.27 cm pressure drop of the fabric and about 10% difference in bending resistance between the warp and the weft directions. <P>SOLUTION: The base fabric for the air bag is obtained by using a modified cross-section filament yarn having 5-50% hollowness of cross section of single filaments and ≤3.5 flatness degree and further not only mechanical characteristics but also low gas permeability and ≤10% difference in bending resistance between the warp and the weft directions because the surface of the base fabric is coated with a resin as the filament yarn constituting the base fabric for the air bag. The resultant base fabric for the air bag has housing properties and reduces collision energy during shock. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a base fabric for an airbag. More specifically, the present invention relates to a base fabric for an airbag that has low air permeability, rigidity and lightness.

[0002]

2. Description of the Related Art In recent years, airbags have become extremely popular as safety devices for protecting passengers of automobiles.

As a requirement for the airbag base fabric, it is necessary to have low gas permeability and mechanical strength that allow it to expand smoothly upon impact. Furthermore, it is also necessary that the human body, especially the face, should not be scratched when inflated when it is inflated, that it can be stored compactly, and that there is no dimensional change during installation on the vehicle body for a long period of time.

Typical air bag base fabrics currently being developed are single yarn fineness 4d to 7d and total fineness 440 to 1100.
A base cloth made of nylon yarn having a circular cross section of dtex and a base cloth further coated with a resin such as chloroprene or silicone (hereinafter referred to as a coated product) are used. However, the one coated with resin has mechanical properties maintained because it uses a thick thread of 440 dtex or more, and although it has an effect on breathability due to the coating, it is sufficiently improved in bending resistance and lightness. There is no.

Recently, however, the weight and compactness
Fabrics in which the surface of the fabric is not coated with a resin have been proposed in consideration of costs. However, in order to suppress gas permeability without coating the resin, it is necessary to woven the fabric at a high density, and as a result of the increased basis weight, the flexibility of the fabric is hardly improved.

On the other hand, in order to solve the above-mentioned problem of [0004], that is, in order to maintain a sufficiently low air permeability, for example, in Japanese Patent Laid-Open No. 10-194063, 315d is coated with a silicon coat to make the fabric soft. It has been described to increase. However, the single yarn fineness is still as thick as 4.4d, and there is a difference in the bending resistance in the warp and weft directions, so that it cannot be said that the storability and the lightness are sufficient.

On the other hand, in order to solve the above-mentioned problem [0005], that is, in order to maintain a sufficiently low air permeability and to increase the flexibility of the cloth, the single yarn fineness of the fibers constituting the cloth is made smaller. There are many methods proposed, and many have been proposed.

For example, Japanese Unexamined Patent Publication (Kokai) No. 64-41438 proposes a base fabric for an air bag, which is made of fibers having a single yarn fineness of 3d or less, with an emphasis on foldability.

Further, in Japanese Unexamined Patent Publication (Kokai) No. 4-2835, a non-coated base fabric for airbags made of polyethylene terephthalate has a ventilation amount of 0.5 cm ³ / sec / cm ² based on its characteristics of being lightweight and thin. A woven fabric having a burst strength of 650 psi or more, a tensile strength of 300 pounds, and a trapezoidal piece tear strength of 40 pounds has been proposed.

Further, in Japanese Unexamined Patent Publication No. 4-214437, 4 dtex made of polyethylene terephthalate.
Hereinafter, a non-coated cloth having a total fineness of 250 to 400 dtex has been proposed.

However, none of the above proposals is a non-coating type, and is not a base cloth having both the air permeability as the effect of coating and the uniform bending resistance in the longitudinal direction. Further, these yarns are conscious of ordinary round cross-section yarns, and use of irregular cross-section yarns or hollow yarns has not been attempted yet.

[0012] In the case of these round cross-section yarns, although the flexibility is improved to some extent by reducing the fineness of the single yarn, a certain fabric thickness is required in view of air permeability, and the result is that the weight is hardly improved. Become.

In addition, the method of simply reducing the single yarn fineness generally causes a problem that fluff and yarn breakage are likely to occur during spinning and weaving. Particularly in the field of airbags, from the viewpoint of cost, gluing or twisting is not performed at the time of weaving, so that the above problems cause a great deal of trouble.

[0014]

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems in the prior art and to provide a coat type air bag base fabric with not only mechanical characteristics but also low gas permeability. Provided is a base fabric for an airbag which has excellent bending resistance, reduces the weight of the entire cloth, and reduces the difference in bending resistance in the longitudinal and longitudinal directions. As a result, the storage capacity and the collision energy at impact can be reduced. It is a thing.

[0015]

In order to achieve the above-mentioned object, in the base fabric for an airbag of the present invention, the filaments constituting the base fabric have a flatness of a single yarn cross section of 3.5 or less and a hollow ratio. Is composed of a hollow flat cross-section yarn of 5 to 55% and is coated with a resin liquid.

In the airbag base fabric of the present invention, further, the constituent filament yarn is a flat filament yarn having a flatness of 3.5 or less and a hollow ratio of 5 to 55%, and a total fineness of 165 dtex or more. 550 dtex or less, single yarn fineness of 0.11 dtex or more and 7.7 dtex or less, strength of 6.6
It is a multifilament with a CN / dtex or more and an elongation of 12.0% or more, and the fabric has a ventilation rate of 1.2 cm ³ / sec / cm ² or less at a pressure drop of 1.27 cm, and
It is preferably a polyamide filament.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.
The greatest feature of the present invention resides in that the single yarn cross section of the filament constituting the airbag base fabric has a specific flatness and is a hollow cross section instead of the usual round cross section. If a modified cross-section yarn having a flatness of a certain level or more is used, the major axis of the single-yarn cross section is arranged on the woven fabric plane in parallel with the woven fabric plane. As a result, the gap per unit surface area is reduced in the thickness direction of the woven fabric, and the ventilation amount is suppressed as compared with the case where the circular cross section having the same fineness is used and the weaving density is the same. In addition, if it is designed to have the same ventilation amount, the total fineness can be reduced.

The flatness of the single yarn cross section in the present invention means the ratio of the long diameter to the short diameter when the single yarn cross section is approximated to an ellipse.
It is defined by the minor axis / major axis. The cross section does not need to be strictly elliptical, and may have a projection or a depression in a part within a range that does not affect the flatness of the whole. Even in such a case, the flatness may be calculated by approximating an ellipse that does not impair the overall outer shape.

In order to obtain the effect of the present invention, it is necessary that the flatness is 3.5 or less, more preferably 2.5 or less. In particular, the cross section is preferably elliptical. 3.
If it is 5 or more, even if it is a flat cross section, the single yarn cross section tends to be randomly positioned when it is made into a woven fabric, and the voids in the fabric thickness direction become large. In addition, the probability that the major axis and the minor axis are oriented in the same direction is reduced. Therefore, the effect of reducing the ventilation amount and reducing the weight of the present invention cannot be obtained. On the other hand, if the flatness exceeds 3.5 and becomes too large, the yarn formability and weavability are deteriorated, and fluffing and the like are likely to occur, which is not preferable. Moreover, the management of nozzles in the spinning process becomes complicated.

When the flatness is less than 3.5 as in the present invention, the fiber outer circumference is larger than the flatness 1, that is, the round cross section.
The surface area increases, and even if the same coating liquid is applied, it is possible to reduce the thickness of the applied resin layer,
The softness increases while maintaining more flexibility. Even more surprisingly, the bending resistances in the warp and weft directions are almost the same, and the difference is 10% or less in the ratio of warp / latitude, and the storability is further improved.

As described above, the cross section is flat, and at the same time, the hollow ratio of the single yarn cross section in the present invention means the ratio of the area of the hollow portion of the single yarn cross section to the entire area of the single yarn cross section. means. The shape of the hollow portion may be circular or any other shape, as long as it is hollow. The hollow rate is 5 to 55%, preferably 5 to 35%, more preferably 5 to 25%. If it is 5% or less, the effect is the same as that of a normal circular cross section, and if it exceeds 55%, it becomes bulky, and the storability is rather deteriorated.

FIG. 1 shows an example of a typical hollow flat section in the present invention. Of course, these are representative examples, and the present invention is not limited thereto. The hollow ratio is represented by a ratio obtained by dividing 100 by a value obtained by dividing the area S1 of the hollow portion by the area S2 of the cross section.

The filament yarn constituting the base fabric for an air bag in the present invention preferably has a total fineness of 165 dtex.
Or more and 550 dtex or less, more preferably 275 dte
It is a multifilament yarn having a fineness of x or more and less than 385 dtex, and preferably a single yarn fineness of 0.11 or more and 7.7 dtex or less, more preferably 1.1 dtex or more and less than 5.5 dtex. If the total fineness exceeds 550 dtex, the thickness of the fabric becomes thick, and the flexibility and lightness are impaired, which is not preferable. On the contrary, the total fineness is 165 dte
If it is less than x, the mechanical strength of the cloth is weak, no matter how high the density of the cloth is, and the cloth is ruptured during expansion, which is not preferable. On the other hand, if the single yarn fineness is thicker than 7.7 dtex, a flat yarn having a flatness of 2.5 or less in the present invention is used,
And even if the total fineness is suppressed, the flexibility is not improved so much.
On the contrary, if the single yarn fineness is less than 0.11 dtex, spinning becomes difficult, and the flattening effect of the present invention becomes small, which is not preferable. Moreover, the hollow effect is not exhibited.

In order to obtain filaments having a single yarn fineness of less than 1.6 dtex, it is effective to use the known sea-island type composite spinning method. In this case, a die with which the island component has a hollow flat cross section may be used.

Further, the filament yarn which constitutes the airbag base fabric of the present invention preferably has a strength of 6.6C.
N / dtex or more, more preferably 7.5 to 9.3CN
/ Dtex, preferably with an elongation of 12.0% or more,
More preferably, it has a characteristic of 14.0% or more. In the above-mentioned fineness constitution, the above-mentioned strong elongation property is a preferable condition in order to satisfy the mechanical properties required for the airbag base fabric, especially the impact strength, tear strength and burst strength. When it is lower than the above values, it is difficult to obtain these mechanical properties, which is not preferable.

The coating film used in the present invention is
Without diluting the addition type silicone rubber coating agent with a solvent, 1 to 60 g / m ^2, preferably 5 to 30 g / m ²
It is formed by applying a coating amount of m ² . As long as it is made of a filament cloth having a modified cross section with a fineness of 165 to 550 dtex and made of filament yarn, it can be a thin, lightweight, easy to fold, and excellent in storability. Further, by making the filament yarn a flat cross section, it is possible to prevent gas leakage with a thin coating film having a coating amount of 1 to 30 g / m ² . For this reason,
The weight can be reduced compared to the conventional coat type. The surface smoothness is excellent, and the airbag can be made more compact.

Further, in the present invention, the addition type silicone rubber coating agent is preferable as the coating agent, and heat-vulcanized silicone rubber, room temperature vulcanized silicone rubber, water-soluble emulsion silicone rubber and the like are also effective. Conventionally known chloroprene-based coating agents and urethane-based coating agents may be used, but silicone-based coating agents are preferable, and silicone-based coating materials are particularly preferable in the case of base fabric made of flat yarn. Due to the surface tension, the speed of bleeding over the entire base fabric after application is high.

The coating agent preferably has a viscosity of 1 to 200 Pa.s, preferably 1 to 1
A viscosity of 00 Pa · s is good. By applying with a knife coater, a thin and uniform coating film having a coating amount of 1 to 30 g / m ² can be easily formed. Further, the surface has a low tackiness and a tackiness of 2 or more, preferably 3 or more, and the storability is further improved. Here, the tackiness means that two samples each having a size of 10 cm × 10 cm are taken, the resin surfaces are overlapped with each other, and a load of 5 kg is applied thereto.
After leaving it in a dryer at ℃ for 1 hour, observe the peeling state of the overlapped parts of the sample, and perform the following ranking evaluation, and the ranked measurement values are 2 or more after folding the base cloth and leaving it Means the releasability when spread. 3: There is no tack and peeling occurs. 2: Peeled but sticky. 1: There is a portion where the resin adheres and does not peel off.

Further, a base fabric for an airbag according to the present invention
Is preferably the ventilation volume of the fabric at a pressure drop of 1.27 cm
Is 1.2 cm³/ sec / cm²Below, more preferably 0.7 cm
³/ sec / cm²The following is acceptable. Where the fabric
The air flow rate is in accordance with JIS-L1096-6.27A method.
It is the measured value. That is, a pressure of 1.27 cm of water
The amount of air passing through the test piece under
It The ventilation volume is 1.2 cm ³/ sec / cm²If you go over
Light and highly reliable instant deployment capability as a backing fabric
It is not preferable because it decreases.

In order to obtain the above-mentioned gas permeation amount, when a normal round cross-section yarn is used, a cover factor of about 1700 or more is required, and a higher total fineness and a higher weaving density are required. In the airbag base fabric of the present invention, a low ventilation amount can be achieved even when the cover factor is 1600.

As the filaments constituting the airbag base fabric in the present invention, polyesters such as polyethylene terephthalate and polybutylene terephthalate,
Nylon 6, Nylon 66, Nylon 46, Nylon 1
Known polymers such as polyamides such as 2 and polyolefins such as polyethylene and polypropylene can be used. Of these, polyesters and polyamides are preferable, and nylons 6 and 6 are more preferable, in consideration of heat resistance, dimensional stability, yarn-forming property, mechanical strength, and the like. Of course, these copolymers may be used.

In particular, the polyamide fiber may contain a copolymerization component for the purpose of enhancing the spinnability, etc. within a range that does not impair the properties thereof. For example, polyamide fibers such as nylon 6.6, nylon 6, nylon 4.6, and nylon 6 and nylon 6
6 copolymer, nylon with polyalkylene glycol,
Polyamide-based fibers obtained by copolymerizing dicarboxylic acid or amine are preferable, but not limited thereto.

Next, a method for producing the multifilament used in the airbag base fabric according to the present invention will be described below.

The polymer used in the present invention is usually spun from a spinneret by a melt spinning method. The spinning conditions differ depending on the polymer used, and appropriate conditions may be selected depending on the viscosity and thermal characteristics of the polymer. In general, in order to prevent deterioration of the polymer due to heat, the shorter the residence time of the polymer in the spinning machine is, the more preferable it is, generally 10 minutes or less, preferably 1 to 5 minutes or less. For example, in the case of polyethylene terephthalate or polyhexamethylene adipamide fiber,
The spinning temperature is in the range of 280 ° C to 310 ° C, the length of 10 to 100 cm immediately below the spinneret, and 200 ° C to 350 ° C.
A heating cylinder controlled to a relative humidity of 85% is used, and the discharge yarn passes through the heating cylinder. The length of the heating cylinder and the temperature and humidity conditions can be optimized depending on the fineness, flatness and number of filaments of the obtained yarn. The heating cylinder is necessary for delaying the solidification of the molten polymer and developing high strength.

In order to prevent thermal deterioration at high temperature,
If necessary, the heating cylinder atmosphere may be sealed with a high temperature inert gas without any problem.

The flatness of the cross section of the single yarn in the present invention is 3.5.
Hereinafter, various methods are possible to obtain a hollow flat yarn having a hollow ratio of 5 to 55%. It is also possible to obtain the desired hollow flat yarn by the direct spinning method in which the polymer is discharged from the modified die hole, and it is also possible to obtain a spinneret having two or more types of polymers at the same time by using the above-mentioned composite spinning method. It is also possible to obtain the desired hollow flat yarn by using it and removing at least one component. C for ease of yarn making and process
It is preferred to use a die with shaped holes.

After passing through the above-mentioned high temperature atmosphere, the spun yarn is cooled and solidified on one side of the running yarn by cold air, and after an oil agent is applied thereto, the spun yarn is taken up by a take-up roll which controls the spinning speed.

The unstretched yarn taken up by the take-up roll is usually continuously drawn, but it is also possible to wind it once and then draw it in another step. The spinning speed is usually 200
The stretching is carried out at 0 m / min or less, and the stretching is carried out by a conventional thermal stretching. Stretching is preferably multi-stage drawing of two or more stages, and the draw ratio is varied depending on the birefringence of the undrawn yarn, the drawing temperature, the draw ratio distribution during multi-stage drawing, and the like.
It may be 6.0 times, preferably 2.0 to 5.5 times.

Next, the drawn yarn is heat set, but the tension and temperature at the time of heat setting may be changed without any problem.

Further, the running yarn may be entangled in the drawing process and the heat setting process. For the entanglement, a known method such as air entanglement can be adopted. For example, in the case of air entanglement,
A high degree of entanglement can be achieved by appropriately changing the pressure of air according to the fineness and tension of the yarn used. If necessary, the obtained yarn may be heat-set.

By the above method, the filament has a flat hollow cross section with a flatness of 3.5 or less and a hollowness of 5 to 55%, and a total fineness of 165 dtex or more and 550 d or more.
tex or less, single yarn fineness of 0.11 dtex or more and 7.7 dt
ex or less, strength 6.6CN / dtex or more, elongation 12.
A multifilament yarn of 0% or more is obtained.

In order to produce a base fabric for an air bag using the above multifilament yarn, the obtained multifilament yarn may be used as it is as a warp yarn and a weft yarn and woven by a usual method. At this time, there is no particular need for twisting or sizing. The texture is not limited to plain weave, diagonal weave, etc., but plain weave is preferable because of ease of production. In addition, an isotropic woven fabric is preferable because of its comprehensive properties as a base fabric for an airbag. The weaving density may be set so that the ventilation amount is 1.2 cm ³ / sec / cm ² or less depending on the total fineness of the filaments used.

The surface of the obtained base cloth may be gravure-coated or printed with a resin having the above-mentioned characteristics, and the method for applying the resin to the inside of the cloth may be dipping. It is determined so that the air permeability of the laminated or applied fabric is 1.2 cm ³ / sec / cm ² or less.

In order to fully exhibit the characteristics of the coated cloth, it is preferably 60 g / m ² or less. If the amount of resin applied exceeds 30 g / m ² , the fabric becomes heavy and rigid and the object of the present invention cannot be achieved.

The obtained air bag base cloth has a tensile strength of 150 kg / 3 cm or more and a tear strength of 20 as a base cloth although it depends on the total fineness, the single yarn fineness and the number of woven fabrics to be formed.
More than kgf, 100mm in flexibility evaluation by the cantilever method
As described below, it is possible to combine flexibility, lightness, and low air permeability at the same time.

The airbag base fabric of the present invention has a flatness of 2.
Since a flat yarn of 5 or less is used, compared to a base fabric having a round cross-section yarn structure of the same fineness, the flexibility and bending resistance can be further increased, and the gas permeation amount can be further suppressed, so that the storability is improved. improves. Further, when it is attempted to obtain the same low air permeability, the total fineness or the woven density can be further reduced, and a thin and lightweight cloth can be obtained.

The air bag base fabric of the present invention may be subjected to scouring, heat setting, and calendering on one or both sides by a known method, if necessary, within a range not impairing the characteristics of the present invention. It doesn't matter.

The present invention is also effective as an air bag base cloth for both uncoated products and coated products, but is lightweight,
In order to bring out the characteristics such as flexibility and low air permeability, it is more preferable to use as a coat type product.

The present invention will be described in detail below with reference to examples. Each physical property in the text or examples was measured as follows.

(1) Tensile strength and breaking elongation of raw yarn: JI
It was based on SL-1017.

(2) Cloth flexibility (rigidity): JIS
-L-1096 (45 degree cantilever method).

(3) Tensile strength of base cloth: JIS-K-6
In accordance with 328 (strip method), measurement was performed with a sample width of 3 cm. The results are shown as the average value of the warp direction value and the weft direction value of the fabric.

(4) Tear strength: JIS-K-6328
In accordance with (Trapezoid method), the sample width was measured at 2.54 cm. The results are shown as the average value of the values in the warp direction and the values in the weft direction.

(5) Flatness: A cross section is photographed with a microscope,
The major axis and minor axis were measured to determine the ratio.

(6) Hollow ratio: A cross section is photographed with a microscope,
The ratio of the hollow area and the whole area was calculated.

(5) Cover factor of cloth: The cover factor K was calculated by the following formula. K = N _w × D _w ^0.5 + N _F × D _F ^0.5 (where N _w :
Warp density (book / inch), D _w : Warp fineness (denier),
N _F: weft density (lines / inch), D _F: a weft fineness (denier). )

(6) Tackiness: Two samples having a size of 10 cm × 10 cm were taken, and the resin surfaces were superposed on each other to obtain 5 pieces.
After applying a load of kg and leaving it in a dryer at 80 ° C for 1 hour,
The peeling state of the overlapped portions of the materials was observed and the following ranking evaluation was performed. 3: There is no tack and peeling occurs. 2: Peeled but sticky. 1: There is a portion where the resin adheres and does not peel off.

[0058]

[Example] [Example 1] A C-type mouthpiece having 72 holes, in which the shape of a single hole is a rectangular shape having a vertical / horizontal ratio of 1.3, by a normal melt spinning method using a nylon 6.6 tip. Spun The spinning temperature is 298 ° C, a heating cylinder having a length of 300 mm and a temperature of 300 ° C is used immediately below the spinneret, and the spinning speed is 6
It was set to 20 m / min.

The spun yarn was continuously wound 22 without winding.
After stretching and heat-treating at 5.4 times at a temperature of 0 ° C., a relaxation treatment is performed at a relaxation rate of 3.0% while applying air entanglement,
A drawn yarn of 347 dtex and 72 filaments was obtained.

The filament obtained was a flat yarn having a hollow ratio of 5% and a flatness of 1.3, and the physical properties were a single yarn fineness of 4.8 dtex, strength of 7.9 CN / dtex and elongation of 14. It was 9%.

Then, the above filaments were used for warp yarns and weft yarns to prepare a plain weave having a weaving density of 52 yarns / inch and 50 wefts / inch.

The base cloth obtained above was scoured and dried, and then a silicone rubber (solid content 50) containing 50% by weight of a resin (polydimethylsiloxane), a catalyst (platinum catalyst) and 47.2% by weight of toluene. %, Viscosity 10000 cps gravure coating (mesh density 40 mesh / in,
Mesh depth 150μm), dry 100 ℃, heat treatment 1
A coated base fabric which was subjected to 50 ° C. × 30 minutes was obtained. The resin adhesion amount was 10 g / m ² .

[Examples 2 and 3] A coated base fabric was obtained in the same manner as in Example 1 except that the hollow ratio was 5% and the flatness was 1.8 and 3.3. The amount of coat is 6,10g
/ M ² .

For [Comparative Examples 1, 2, 3, 4], the same method as in Examples 1, 2, 3 was used, but the flatness and silicon coating were as shown in Table 1.

For [Example 4], the number of filaments,
Example 1 was followed except that the hollowness was changed.

For [Examples 5, 6, and 7], the total fineness,
The single yarn fineness, flatness, hollowness, and coating amount were changed.

Table 1 shows the physical properties and fabric properties of the yarns of Examples 1 to 7 and Comparative Examples 1 to 4 above.

[0068]

[Table 1]

As is clear from Table 1, the samples in this example have lower flexibility and gas permeability and are less rigid than fabrics using a round cross-section yarn having an equivalent fineness and an equivalent woven density. The difference in softness in the longitudinal direction is also 10% or less, which shows that the fabric is excellent as a base fabric for an airbag. Also,
This means that when designed to have the same air permeability, the base fabric using the flat cross-section yarn of the present invention reduces the total fineness and the coating amount of the coating agent,
It is also shown that it is possible to reduce the weaving density, and it can be seen that it is possible to achieve weight reduction, further softening and improvement of storability, as compared with the case of using a thread having a round cross section.

[0070]

EFFECT OF THE INVENTION Since the airbag fabric according to the present invention uses flat yarns having a hollow section of 5 to 55% and a flatness of 3.5 or less as filaments, not to mention mechanical properties. Has low gas permeability and excellent flexibility,
In addition, the coating amount of the coating agent can be reduced, the weight of the entire fabric can be reduced, and the base fabric for an air bag that can be stored and can reduce the collision energy at the time of impact can be obtained.

[Brief description of drawings]

FIG. 1 Example of cross section of hollow flat yarn

[Explanation of symbols]

a major axis b Short diameter Total area of S1 S2 Area of hollow part

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) D06M 101: 34 D06M 101: 34 F term (reference) 3D054 CC26 CC45 FF03 FF13 FF14 FF18 FF20 4L033 AA07 AA08 AB05 AC02 AC09 AC15 CA59 4L048 AA21 AA24 AA34 AA37 AA39 AA48 AA49 AB07 CA01 CA02 CA09 CA11 CA12 CA15 DA25

Claims (7)

[Claims] 1. A filament constituting an airbag base fabric has a flatness of a single yarn cross section of 3.5 or less and a hollow ratio of 5 to 5.
5% hollow flat cross section yarn, JIS-L-1096
A base fabric for an airbag, characterized by being coated with a resin, which has a difference in bending resistance of 10% or less (according to a 45-degree cantilever method) in the longitudinal direction. 2. The bending resistance in the warp and weft directions is 70 mm in both directions.
The base fabric for an airbag according to claim 1, wherein the ratio is not more than 10%. 3. The filament yarn constituting the base fabric for an airbag is a multifilament yarn having a total fineness of 150 dtex or more and 550 dtex or less, and a single yarn fineness of 0.11 dtex or more and 7.7 dtex or less. 2. The airbag base fabric according to any one of 2. 4. A filament yarn constituting an airbag fabric has a strength of 6.6 CN / dtex or more and an elongation of 12.0.
% Or more of the characteristics.
The airbag base fabric according to any one of 1. 5. The air bag base cloth has a ventilation rate of 1.2 cm ³ / sec / cm ² or less at a pressure drop of 1.27 cm, and the air bag base cloth has a ventilation rate of 1.2 cm ³ / sec / cm ² or less. Base fabric for airbags. 6. The airbag base fabric according to claim 1, wherein the filaments forming the airbag base fabric are polyamide type and polyester type filaments. 7. The airbag base fabric according to claim 1, which has a tackiness of 3 or more and does not stick when folded.