JPH06128836A - Ground fabric for air bags and air bags - Google Patents

Abstract

PURPOSE:To produce a ground fabric for air bags having high mechanical strength, excellent gas impermeability, reduced shock to the human body on expansion and providing compact non-coated air bags. CONSTITUTION:In the ground fabric for air bags, a mixed yarn of 100 to 400 total deniers and over 6.5g/d tensile strength is used where the yarn is composed of polyester filaments of more than 1.76 intrinsic viscosity(IV) and 0.03 to 2.0 denier filament fineness as the weft or the warp, and polyamide filaments of more than 2.8 relative viscosity measured in sulfuric acid and 0.03 to 2.0 denier fineness at a ratio of from 3:7 to 7:3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base fabric for an air bag not coated with a resin and an air bag using the base fabric. More specifically, the present invention suppresses gas permeability without applying a resin coat. The present invention relates to a base fabric for an airbag that has little impact resistance to a human body when inflated and can be stored compactly, and an airbag using the base fabric.

[0002]

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

The requirements for the airbag base fabric are, first of all, that it has low gas permeability and mechanical strength sufficient to expand smoothly upon impact.

Further, it is required that the human body, especially the face, should not be damaged by abrasion when 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.

However, no airbag base fabric satisfying all the above requirements has been developed so far. That is, among the items required for the above-mentioned airbag, for example, if the gas permeability is to be suppressed, the base fabric becomes thick and lacks compactness, and the impact resistance when contacted with the human body is increased. However, there is a tendency for the base fabric design to have contradictory characteristics.

As a typical air bag base fabric currently being developed, for example, a single yarn fineness of 4 to 7d and a total fineness of 400D to 100 described in JP-A-3-243442.
A base fabric made of 0D nylon yarn, and a base fabric coated with a resin such as chloroprene or silicone (hereinafter referred to as a coated product) are known.
However, the base fabric for airbags is excellent in suppressing gas permeability, but the base fabric is large in thickness and inferior in compactness. In addition, the base fabric was lacking in flexibility and was hard, and the impact resistance was poor. Further, since all the yarns are made of nylon yarn, there is a problem that the dimensional stability is poor. Further, in the case of the coated product, there are problems that the manufacturing process is complicated and it is difficult to uniformly coat the resin.

In order to solve the above problems, various proposals have been made. For example, as described in Japanese Patent Application Laid-Open No. 1-104848, the total fineness of the multifilaments constituting the base cloth is reduced to reduce the base cloth thickness. There is also an attempt to make the base fabric soft and give compactness by making it thin. However, if the total fineness is simply reduced, the gas permeability is significantly deteriorated, and the resin coating becomes essential, and as a result, the compactness cannot be solved. In addition, in order to reduce gas permeability and improve compactness, attempts have been made to reduce the total fineness and weave the woven fabric at a higher density, but the softness is still a satisfactory value. Has not been improved.

On the other hand, in Japanese Patent Laid-Open No. 64-41438, the foldability is emphasized and the strength is 8.5 g / d or more.
In addition, a base fabric for an airbag is described which is made of fibers having a single yarn fineness of 3d or less. However, in this case, in order to keep the gas permeability low, the total fineness is still 400D-100.
OD is required, the amount of yarn used is large, and compactness is not improved.

Further, Japanese Unexamined Patent Publication (Kokai) No. 1-122752 discloses a base fabric for an airbag, which is excellent in dimensional stability, obtained by shrink-processing a high-density fabric, heat-fixing it, and calendering it. . However, in the airbag base fabric, since the fibers forming the fabric are a single material, the single yarn fibers are strongly converged, and the fibers forming the fabric are contracted by heat treatment to obtain a higher density. The gap between the warp yarns or the weft yarns was not narrowed, and the gas permeability was not so suppressed. In general, when a cloth made of a single material is shrunk to have a high density, the surface of the cloth is hard and the flexibility is remarkably reduced.

Further, Japanese Patent Laid-Open No. 4-2835 discloses that
An uncoated base fabric for airbags made of polyethylene terephthalate fiber has been proposed, which describes the effect of being lightweight and thin. However, in the present invention, the total fineness of the fibers used is 400 D to 1000 D, and thick yarns are used, the flexibility of the base fabric is not improved, and further, both sides are used to suppress gas permeability. Although it had to be calendered and the resin was not coated, the base cloth itself was thick and the manufacturing process was complicated. Not only that, but it also had the problem of enormous manufacturing costs.

Further, Japanese Patent Publication No. 57-30419 discloses a fabric in which a polyester yarn and a polyamide yarn are present in one multifilament. The fabric is for clothing or wiping. It is made for the purpose of cloth, the viscosity of the polymer used is low, the strength of the obtained yarn is also low, the mechanical strength as a fabric is extremely weak, and it can be used as an airbag. There wasn't. Moreover, since the fineness of the multifilament forming the woven fabric is extremely low at 50 to 100D, it has a large gas permeability as an airbag base fabric,
It was not put to practical use.

[0012]

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems in the prior art and to provide excellent mechanical strength required for an uncoated airbag base cloth,
An object of the present invention is to provide a base fabric for an airbag which has excellent low gas permeability, has little impact on the human body when inflated, and can be stored compactly, and an airbag using the base fabric.

[0013]

According to the constitution of the present invention, in a base fabric for an airbag, a single yarn having an intrinsic viscosity IV of 0.76 or more is added to a warp yarn and / or a weft yarn of a fabric forming the base fabric. Polyester yarn having a fineness of 0.03d to 2.0d,
Sulfuric acid relative viscosity ηrn is 2.8 or more and single yarn fineness is 0.03d
A mixed yarn in which the polyamide yarn of 2.0 to 2.0d is mixed in a ratio within the range of 3: 7 to 7: 3 is used, and the total fineness of the mixed yarn is 100D to 400D and the tensile strength is 6.
The base fabric for an airbag is characterized in that it is 0 g / d or more.

The airbag base fabric is used in the airbag as a whole or at least on the side in contact with the human body.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The greatest feature of the present invention is that a multifilament constituting an air bag base fabric is composed of a high-strength polyester yarn having a thin single yarn fineness and a high-strength polyamide yarn having a thin single yarn fineness. Is to be. Furthermore, in the above-mentioned mixed yarn, the polyester yarn and the polyamide yarn are formed by uniformly mixed yarns. As described above, since the polyester yarn and the polyamide yarn are integrated, they can be drawn out without impairing the advantages of both the dimensional stability of the polyester and the flexibility of the polyamide, and it is a preferable base fabric for an airbag.

The yarn in which the polyester yarn and the polyamide yarn are uniformly mixed means that the polyester yarn and the polyamide yarn are randomly arranged in the cross section of the multifilament. Since both the polyester yarn and the polyamide yarn have the property that the former is hydrophobic and the latter is hydrophilic, the repulsive force is naturally exerted between the single yarns and the convergence in the multifilament is loosened. As a result, when the fabric is formed, the filaments are uniformly arranged in the fabric surface, and the gas permeability is suppressed.

In the mixed yarn of polyester yarn and polyamide yarn in the present invention, one multifilament constituting the warp yarn and the weft yarn of the woven fabric is composed of a plurality of polyester yarns and a plurality of polyamide yarns. , Single yarn must be mixed. In the case of a fabric in which one multifilament is formed by a single composition and adjacent warp or weft yarns are multifilaments composed of different polymers, a plurality of single yarn fibers in one multifilament Remains converged, and gas permeability cannot be suppressed.

The composition ratio of the polyester yarn and the polyamide yarn in the mixed yarn of the polyester yarn and the polyamide yarn in the present invention is 5 in order to bring out the characteristics of both.
The closer to 0:50, the more preferable, and usually 30:70 to.
A range of 70:30 is preferred. Outside the above range,
The total repulsive force between the polyester yarn and the polyamide yarn, which are different polymers, becomes small, and it becomes difficult to suppress the gas permeability. The number of filaments in one multifilament is preferably 50 or more, more preferably 200 or more and 12000 or less. If the number of filaments is too small, the repulsion between single yarn fibers, which is the effect of the present invention, does not work effectively and the gas permeability cannot be suppressed, and if it is too large, the total fineness falls outside the range of the present invention, The woven fabric becomes thick, resulting in insufficient flexibility and compactness. Usually, the number of filaments is set in accordance with the single yarn fineness and the total fineness, although the preferable range is usually 12,000 or less.

The mixed yarn can be produced by a known method. For example, a method in which polyester and polyamide yarns prepared separately are combined and entangled with air, steam, etc. is used as one multifilament, and polyester and polyamide are produced from the same spinneret using the composite spinning method. And a method of simultaneously discharging and forming a multifilament. It is preferable to use the latter composite spinning method in that the polyester yarn and the polyamide yarn are more uniformly mixed and the repulsion between the single yarns is maximized.

In the air bag base fabric of the present invention, the effect of suppressing the gas permeability as a fabric is obtained when the whole yarns of the warp yarns and the weft yarns constituting the base fabric are the mixed yarns. Although it is most remarkably expressed, the air permeability is sufficiently suppressed even when one of the warp yarns or the weft yarns is woven using a mixed yarn of the polyester yarn and the polyamide yarn. In addition, it is not always necessary to use it for all warp yarns or weft yarns, and for example, it does not matter at all to mix other kinds of filaments into the woven fabric for the purpose of reinforcing the effect of the present invention.

Further, in the airbag base fabric of the present invention, the fabric woven using the mixed yarn of the polyester yarn and the polyamide yarn constitutes the entire surface of the airbag fabric. It is more preferable in terms of both lightweight and compactness. Further, even when the airbag is used at least on the side that comes into contact with the human body when the airbag is inflated, the effects of the present invention of gas permeation resistance, compactness, and impact resistance are sufficiently exhibited. In this case, thick fabric should be used in places where heat resistance is more required, such as near the inflator, or after expansion on a part of the base fabric that does not come into contact with the human body, to the extent that overall compactness and flexibility are not impaired. Providing a low-density portion to intentionally deflate the airbag is
It doesn't matter at all. Further, when stitching into a bag shape, it is of course possible to apply a reinforcing cloth or tape to the stitched portion. If the mixed yarn of the polyester yarn and the polyamide yarn of the present invention is used at least on the side that comes into contact with the human body, the impact resistance to the human body can be sufficiently softened.

The airbag base fabric of the present invention is required to have a mechanical strength sufficient to withstand the impact during inflation. Tensile strength, which is a mechanical property as a base fabric,
Tear strength and burst strength also depend on the influence of woven density, etc., but in the base fabric of the present invention, since the filaments having a small total fineness are used as described later, the base fabric is thin and the influence of the strength of the raw yarn to be composed. Will be large. Therefore, the mixed yarns composed of the polyester yarns and the polyamide yarns that compose the airbag base fabric in the present invention are multifilaments each having a single yarn fineness of 0.03 to 2.0d. Strength is 6.
It should be 0 g / d or more, and more preferably 7.5 g / d or more. If it is 6.0 g / d or less, the mechanical strength of the base fabric may be insufficient, and it may not be possible to withstand the pressure applied when the airbag is inflated.

The intrinsic viscosity IV of the polyester yarn constituting the airbag base fabric in the present invention is 0.76 or more, preferably 0.83 or more, and the sulfuric acid relative viscosity ηrn of the polyamide fiber is 2.8 or more, preferably 3 By setting it to be 0.0 or more, the durability of the airbag is improved, and in combination with the above-mentioned yarn strength characteristics, it is possible to improve the shock absorbing property when the airbag is instantaneously inflated.

The fineness of the mixed yarn in the present invention as a multifilament is 100D or more 40 in order to reduce the thickness of the cloth and to exhibit compactness and flexibility.
Set to 0D or less. The fineness is preferably 150 D or more 2
It is necessary to set the range to 80D or less. When the fineness exceeds 400D, the gas permeability of the cloth is governed by the thickness, and the effect of the present invention is reduced in lightness and compactness, and impact resistance is also increased. Further, if the fineness is less than 100D, the fabric becomes too thin and the gas permeability becomes large, and although the high-strength yarn is used, the mechanical strength is sufficient to withstand the impact during expansion. Is insufficient, which is not preferable.

That is, in the airbag base fabric according to the present invention, the yarns constituting the base fabric are polyester yarns having an intrinsic viscosity IV of 0.76 or more and a single yarn fineness of 0.03 to 2.0d. And a polyamide yarn having a sulfuric acid relative viscosity ηrn of 2.8 or more and a single yarn fineness of 0.03 to 2.0d is 3:
It is a mixed yarn obtained by mixing within a range of 7 to 7: 3, and the fineness of the mixed yarn is 100 to 400D, and the tensile strength is all required to be 6.5 g / d or more. By satisfying the requirements, excellent effects can be obtained in compactness, lightness, low gas permeability, and impact resistance to a human body as a base fabric for an airbag.

In the present invention, the smaller the fineness of the single yarns forming the mixed yarn, the more the repulsive force between the single yarns acts, and as a result, the air flow rate is suppressed. For this reason, both the polyester yarn and the polyamide yarn constituting the mixed yarn of the present invention need to have a single yarn fineness of 0.03d or more and 2.0d or less,
It is preferably 0.05d or more and 1.0d or less, and even more preferably 0.06d or more and 0.6d or less. The finer the single yarn fineness, the better the softness of the fabric,
Although it is a compact fabric, if the single yarn fineness is less than 0.03d, stable spinning becomes difficult, which is not preferable. On the other hand, when it exceeds 2d, not only the repulsive force between the single yarns described above does not work, but also the cloth is not flexible and the compactness becomes poor.

The single yarn fineness of 2.0 d or less, particularly 1.0 d or less, can be easily obtained by using the above-described composite spinning method. For example, by using the spinneret described in Japanese Patent Publication No. 58-4086, two different island components and one sea component are simultaneously spun into a woven fabric, and the sea component is removed by post-treatment. For example, a method may be used in which a large number of low-definition filaments are joined together and spun into a single yarn, and then divided into a large number of filaments by solvent treatment or the like. In this case, finally a denser fabric is obtained,
In order to further suppress the expected permeability, it is preferable that less sea components are removed. The latter split-spinning without the sea component to be removed becomes more preferred. Furthermore, when these composite spinning methods are used, a plurality of filaments are still integrated when producing a woven fabric, and defects such as rubbing and fluff during weaving can be reduced, which is preferable.

In the above-described composite spinning, a plurality of single yarn finenesses are integrated at the time of spinning, and it is necessary to go through a step of dividing the single yarn after forming a woven fabric. As the dividing method, one component is expanded by using heat or a solvent as compared with the other component and divided by the strain, or the third polymer in which a plurality of single yarns are assembled is dissolved and removed by a solvent or the like. There is a method of dividing by that. In these treatments, since the entire fabric shrinks at the same time as the division, the fabric becomes denser, and as a result, it is more convenient to suppress the air flow rate.

As described above, in the airbag base fabric according to the present invention, the multifilaments having a fineness of 100D to 400D are used in order to have compactness and lightness. The woven fabric obtained by weaving the strips tends to enhance gas permeability.
Therefore, the woven base fabric is made to have a higher yarn density so as to suppress gas permeability. For example, when the high density of a fabric is expressed by a cover factor defined by (total fineness during fabric production) ^1/2 × (average value of vertical weave density and horizontal weave density), 800 or more, and more preferably 1
The number may be set to 000, and the number of yarns to be driven may be set at the time of producing the fabric so as to fall within the range.

In the present invention, known polyesters and polyamides that form the mixed yarn can be used. As the polyester, in addition to polyethylene terephthalate, polybutylene terephthalate and the like, polyarylate and the like can be used. Examples of polyamides include nylon 6, nylon 66, nylon 46, nylon 12 and the like. Further, these polyesters and polyamides may contain a copolymerization component for the purpose of enhancing the spinnability, etc. within a range that does not impair their properties.

Further, in the case where a yarn having a fineness is finally obtained by removing one component as described above, a known polymer can be used as the sea component. Upon removal, these polymers should not adversely affect the polyester and polyamide forming the mixed yarn which is an island component. Specific examples thereof include polystyrene and polyester obtained by copolymerizing 5-sodium sulfoisophthalic acid in an amount of 5 to 20 mol%, but the present invention is not limited thereto.

In the airbag base fabric of the present invention, it is preferable that the single yarn is divided into the fineness range of the present invention and then subjected to a shrinking treatment if necessary. This shrinking treatment can be performed by dry heat treatment, wet heat treatment, or solvent treatment. As a matter of course, when the composite spinning is used as described above, it is possible to shrink the seams at the same time in the sea removing and dividing steps. In the shrinking treatment, particularly high shrinkage can be applied when the mixed yarn of the present invention is used.

Hereinafter, the present invention will be described in detail with reference to Examples. In this Example, the cover factors calculated from the total fineness and the weave density are substantially equalized to facilitate comparison between Examples and Comparative Examples. I chose Moreover, each physical property in an Example was measured as follows.

(1) Intrinsic viscosity IV Using an Ostwald viscometer, the relative viscosity ηrp of a solution of 3 g of a sample dissolved in 100 ml of orthochlorophenol was measured at 25 ° C., and IV was calculated by the following approximate expression. IV = 0.0242 ηrp + 0.2634 However, ηrp = (t × d) / (t0 × d0) t: Fall time of solution (sec) t0: Fall time of orthochlorophenol (sec) d: Density of solution (g / cc) d0: density of orthochlorphenol (g / cc).

(2) Sulfuric Acid Relative Viscosity ηrn A sample was dissolved in 98% sulfuric acid at a concentration of 1% by weight and measured at 25 ° C. using an Ostwald viscometer.

(3) Thickness: Measured according to JIS-L-1096.

(4) Aeration rate: JIS-L-1096 (A
Method) and the amount of passing air is cc / cm ² / sec
Indicated by.

(5) Bending resistance: JIS-L-1096 (4
5 ° cantilever method).

(6) Bursting strength: JIS-L-1018A
It is a value measured according to the method (Mullen method).

(7) Cover factor of cloth: Defined by the following equation.

Cover factor = (total fineness during fabric production)
^1/2 × (average of vertical and horizontal weave density)

[0042]

【Example】

Example 1 Using a three-component composite spinneret equivalent to that described in Japanese Examined Patent Publication No. 57-49653, polyethylene terephthalate with IV = 1.20 as island component 1 and η = 3.2 as island component 2.
Nylon 66 of No. 6 is used as a sea component, and composite spinning is performed with each polymer of copolyester obtained by copolymerizing terephthalic acid / isophthalic acid 87.5 mol% (70/30) and 5-sodium sulfoisophthalic acid 12.5% mol%. And was wound at a spinning speed of 1000 m / min. At this time, a die having 34 holes in the island 1, 36 holes in the island 2, and 10 filaments was used, and the island / sea was set to 90/10. At this time, the ratio of the polyester yarn to the polyamide yarn is calculated to be 49:51.

Next, the yarn was drawn 4.4 times using a hot plate to obtain a 50D-10f (70L) drawn yarn. The physical properties of the yarn were a strength of 7.2 g / d and an elongation of 20.0%.

After the above-mentioned three drawn yarns were combined into 150D, the yarns were used as warp yarns and weft yarns to weave a plain weave of 90 woven warp / inch and 86 weft / inch. . At this time, the cover factor of the cloth is calculated to be 1078.

Then, the fabric is pretreated with a maleic acid aqueous solution of 3.0 g / l at a temperature of 130 ° C. for a treatment time of 120 minutes, and then with a sodium hydroxide aqueous solution of 9.0 g / l at a temperature of 80 ° C. Then, an alkali treatment for a treatment time of 120 minutes was performed to remove sea components.

After that, the cloth was dried in a hot air dryer at 80 ° C., the dimensions of the cloth were measured, and the shrinkage ratio in sea removal / drying was calculated from the length and width of the cloth. It had shrunk by 4%.

A small amount of the cloth was cut and dyed with an acid dye by a conventional method, and the cut cross section was observed with a scanning electron microscope. As a result, the sea component was removed cleanly, and a large number of ultrafine single yarns were gathered. At the same time, it was confirmed that polyethylene terephthalate and nylon 66 were randomly arranged.

The characteristics of the above-mentioned cloth and the characteristics of the airbag manufactured by using the cloth are shown in Table 1.

Example 2 A 16-division die similar to that described in JP-B-47-2485 was used, and the polymer used in Example 1 was IV =
1.20 polyethylene terephthalate, and η = 3.
Nylon 66 of No. 2 was used to carry out split-type composite spinning at a spinning speed of 800 m / min, and then drawn to 4.2 times by a known hot plate drawing method. The drawn yarn obtained was 160D-
It was 10f. The physical properties of the yarn were a strength of 7.9 g / d and an elongation of 18.7%.

A plain weave having a weaving density of 88 warps / inch and 84 wefts / inch was woven by using the drawn yarns as warp yarns and weft yarns. At this time, the cover factor of the cloth is 1088.
Is calculated.

Then, as described in JP-A-61-669, the cloth was impregnated with an ethylene glycol solution containing 20% benzyl alcohol at 40 ° C. for 8 minutes to separate polyethylene terephthalate and nylon 66.

Then, the fabric was dried in a hot air dryer at 80 ° C. The single yarn fineness is calculated to be about 1.0 d for both.

After drying, the dimensions of the fabric were measured, and the shrinkage rate in sea removal / drying was calculated from the lengths of the length and width, and it was found that the area was shrinking by 10.5%.

The characteristics of the above-mentioned cloth and the characteristics of the airbag manufactured by using the cloth are shown in Table 1.

Comparative Example 1 In Example 1, a fabric was woven by directly using the 50D filaments as the warp yarns and the weft yarns without combining them. At this time, the weaving density is 155 vertical / inch, 1 horizontal
40 pieces / inch.

Then, the woven fabric was similarly treated with an aqueous maleic acid solution and an aqueous sodium hydroxide solution to remove sea components.

Then, the fabric was dried in a hot air dryer at 80 ° C.

The characteristics of the above-mentioned cloth and the characteristics of the airbag manufactured by using the cloth are shown in Table 1.

Comparative Example 2 In Example 1, the same fabric was woven using polyethylene terephthalate for both the island component 1 and the island component 2.

At this time, the shrinkage ratio of the dried cloth is 6.
It was 4%.

The characteristics of the above-mentioned cloth and the characteristics of the airbag manufactured by using the cloth are shown in Table 1.

Comparative Example 3 In Example 2, a spinneret having a spinneret having a division number of 8 was used to obtain a drawn yarn of 200D-10f.

Then, similarly, the drawn yarn is used for the warp yarn and the weft yarn, and the weaving density is 75 warps / inch and 74 wefts /
Weaved a plain plain weave. At this time, the cover factor of the cloth is calculated to be 1053.

Then, the cloth was treated with 20% in the same manner as in Example 2.
Was immersed in an ethylene glycol solution containing benzyl alcohol at 40 ° C. for 8 minutes to separate polyethylene terephthalate and nylon 66.

Thereafter, the cloth was dried in a hot air dryer at 80 ° C.

Since the number of divisions of the fibers constituting the cloth is 8, the single yarn fineness of both is about 2.5d.
Is calculated.

After drying, the dimensions of the fabric were measured, and the shrinkage ratio in sea removal / drying was calculated from the length and width of the fabric, and it was found that the area was shrinking by 10.5%.

The characteristics of the above-mentioned cloth and the characteristics of the airbag manufactured by using the cloth are as shown in Table 1.

Comparative Example 4 Nine 50D-10f (70L) yarns prepared in Example 1 were combined to form a 450D-90f (70L) multifilament, which were then warp and weft. A plain weave of 50 warp / inch and 48 weft / inch was woven. At this time, the cover factor of the cloth is calculated to be 1039.

Then, the fabric was subjected to sea removal treatment in the same manner as in Example 1 to remove sea components, and then the fabric was dried in a hot air dryer at 80 ° C.

After drying, the dimensions of the fabric were measured, and the shrinkage ratio in sea removal / drying was calculated from the length and width of the fabric, and it was found that the area was shrinking by 11.6%.

Table 1 shows the characteristics of the above-mentioned cloth and the characteristics of the airbag manufactured by using the cloth.

Comparative Example 5 IV = 0.60 when performing the same spinning as in Example 1.
Polyethylene terephthalate of, η = as island component 2
2.5 nylon 66 was used.

As in Example 1, the obtained fiber was made into a cloth, deseaed to remove sea components, and then dried.

The characteristics of the above-mentioned cloth and the characteristics of the airbag manufactured by using the cloth are shown in Table 1.

Judging from the values in Table 1, the gas permeability of the air bag base fabrics described in Examples 1 and 2 and Comparative Examples 1 to 4,
Table 2 shows the qualitative judgment of impact and compactness.

[0077]

[Table 1]

[0078]

[Table 2]

As is clear from Tables 1 and 2, the fabrics in the examples according to the present invention had gas permeability, impact resistance, and
It is excellent in both compactness, and it can be seen that it is well-balanced as a base fabric for airbags. On the other hand, it is understood that Comparative Example 1 is inferior in gas permeability and impact resistance because the total fineness of the mixed yarn used is low.
Further, in Comparative Example 2, since it is woven only from polyester, it is understood that there is no repulsion between the single yarns and the fibers remain converged, and the gas permeation amount is large. Further, in Comparative Example 3, since the single yarn fineness is large, the fabric is hard and inferior in compactness, and the ventilation amount cannot be suppressed. Furthermore, in Comparative Example 4, the total fineness is large, the fabric becomes heavy, and the impact resistance and compactness are inferior. In Comparative Example 5, the characteristics that the mechanical strength is extremely low due to the low yarn strength are recognized. .

Example 3 and Comparative Example 6 When sewing an airbag, the cloth woven in Example 1 was used on the entire surface of the side that contacts the human body, and the surface on which the inflator was attached was coated with silicon. An airbag was made using a fabric made of certain 315D-72f nylon 66. (Example 3).

On the other hand, an air bag using 315D-72f nylon 66 whose surface is coated with silicon on both front and back sides was prepared for comparison. (Comparative example 6).

As for the compactness and lightness of the air bag, the air bag of Example 3 partially using the base fabric of the present invention is
Despite being partially used, it was remarkably superior to that of Comparative Example 6.

[0083]

EFFECT OF THE INVENTION According to the base fabric for an air bag of the present invention, the warp yarn and / or the weft yarn of the fabric forming the base fabric has an intrinsic viscosity IV of 0.76 or more and a single yarn fineness of 0.03.
d to 2.0d polyester yarn and sulfuric acid relative viscosity ηr
A mixed yarn is used in which n is 2.8 or more and polyamide yarn having a single yarn fineness of 0.03d to 2.0d is mixed in a ratio within the range of 3: 7 to 7: 3. Total fineness is 10
With 0D to 400D and tensile strength of 6.5g / d or more, it has excellent mechanical strength, excellent low gas permeability, less impact on human body when inflated, and a compact non-coated airbag. can get.

Claims (2)

[Claims] 1. In a base fabric for an airbag, a warp yarn and / or a weft yarn of a fabric forming the base fabric has an intrinsic viscosity IV of 0.76 or more and a single yarn fineness of 0.03d to 2.0d.
And a sulfuric acid relative viscosity ηrn of 2.8 or more and a polyamide yarn having a single yarn fineness of 0.03d to 2.0d in a ratio within the range of 3: 7 to 7: 3. Used, the total fineness of the mixed yarn is 100D to 400
D, a tensile strength of 6.0 g / d or more, a base fabric for an airbag. 2. An airbag, wherein the airbag base fabric according to claim 1 is used on the entire airbag or at least on the side in contact with the human body.