JP2006016707A - Base cloth for air bag, air bag and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide base cloth for air bags that develops high output on the operation, has high mechanical strength that is resistant to the high temperature gas and has excellent resistance to yarn slippage in sewed parts, and provide an air bag therefrom and a method for producing the air bags. <P>SOLUTION: The base cloth for air bags is made of a synthetic fiber woven fabric in which the cover factor is 2,300 to 2,600, the average value of the tensile strength of the warp and the weft of the base cloth is 650 to 800 N/cm and the average value of the deviation resisting power in the warp direction and the weft direction of the base cloth is in the range of from 650 to 950 N. The air bag according to this invention is produced by using the base cloth stated above. The method for producing the base cloth comprises at least the weaving step and the finishing step. Thus, in the weaving step, the warp is shot 2 to 4 per the unit hole and the weaving tension is retained to from 100 to 200 g/yarn. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an air bag base fabric excellent in mechanical properties that can withstand high output during operation, high-temperature gas, and resistance to misalignment at a sewing portion, an air bag comprising the same, and a method for manufacturing the same.

  In recent years, various types of airbags have been developed and recognized for their effectiveness in order to ensure the safety of passengers in the event of accidents involving various types of transportation, especially automobiles. Not only driver airbags and passenger airbags that protect occupants from collisions, but also side airbags and curtain airbags that protect occupants from side collisions are becoming widespread.

  The airbag is inflated and deployed in a very short time after the vehicle collides to absorb the passenger's collision energy generated during the collision. This bag is inflated and deployed with a high-power, high-temperature gas from a gas generator called an inflator, and the bag (main body base fabric), reinforcing fabric, and sewing thread that constitute the airbag can withstand the above gas It has become. As the structure, there has been proposed an airbag using a coated base fabric in which a heat-resistant resin or rubber is applied to the airbag base fabric. However, the coating base fabric has a problem that coating increases the weight of the airbag, resulting in a bulky problem and a processing cost. For this reason, a coating fabric that solves the above problems by reducing the density of the airbag base fabric and reducing the amount of resin has been proposed. As a result, the misalignment of the parts deteriorates, and the damage to the occupant cannot be reduced by the airbag.

  Therefore, in order to solve such problems, there is an air bag using a so-called non-coated base fabric that does not apply resin, and as a corresponding technology, nylon 6 · having high mechanical strength and excellent mechanical properties. 6, high-density non-coated airbags composed of polyamide fiber fabrics such as nylon 6 or polyester fiber fabrics are being studied.

  For example, a method for producing a non-coated base fabric that satisfies mechanical properties and has low gas permeability and excellent flexibility (see Patent Document 1) is disclosed. Furthermore, a method for manufacturing a base fabric for an air bag having excellent mechanical properties and low air permeability (see Patent Document 2) has been proposed.

  However, these airbag base fabrics are not compatible with high-temperature, high-power inflators that support dualization of inflators in accordance with the revision of US legislation FMVSS 208 in 2000. That is, as the output increases, the misalignment of the sewn portion of the airbag increases, and high-temperature gas leaks from the misaligned portion, so that damage to the occupant cannot be reduced.

For example, a base fabric for airbags (see Patent Document 3) that has improved such problems and has excellent anti-displacement properties has been proposed. When this airbag base fabric is used as an airbag, the base fabric itself is used as having an exhaust function, and the high output and high temperature gas applied to the sewing portion are reduced. However, in order to have sufficient occupant restraint, which is the most important function of the airbag, it is important to deploy the airbag at a high speed to quickly catch the occupant. However, the airbag has an exhaust action on the base fabric itself. As a result, there is a problem that high-speed deployment cannot be realized. In addition, an air bag base fabric (see Patent Document 4) excellent in anti-missing property has been proposed. However, although this airbag fabric can be implemented by setting the density ratio of warp and weft yarns within a certain range, recent inflator output has been improved by 10 to 15% and the deployment time has been lengthened. Further, since the amount of heat is increased, the above-described base fabric has a problem that the amount of misalignment of the stitched portion after deployment becomes large and cannot be applied as an airbag. Thus, there is a demand for an air bag that has high output, mechanical characteristics that can withstand high-temperature gas, and excellent anti-displacement at the sewing portion.
JP 2000-328388 A JP 2002-220760 A JP-A-6-234346 JP 2001-277970 A

  In view of the background of such a conventional airbag, the present invention provides a base fabric for an airbag excellent in mechanical characteristics capable of withstanding high output, high-temperature gas, and resistance to misalignment in a sewing portion, an airbag comprising the same, and a method for manufacturing the airbag Is intended to provide.

  The present invention employs the following means in order to solve such problems.

  That is, the airbag base fabric of the present invention is an airbag base fabric made of a synthetic fiber fabric. The cover factor is 2300 to 2600, and the average value of the tensile strength in the warp direction and the weft direction of the base fabric is 650 to 600. 800 N / cm, and the average value of the slip resistance in the warp direction and the weft direction of the base fabric is in each range of 650 to 950 N.

  The method for producing an airbag base fabric according to the present invention is a method for producing an airbag fabric comprising at least a weaving process and a finishing process, and in the weaving process, 2 to 4 warp yarns are placed. And the weaving tension is in the range of 100 to 200 g / piece.

  According to the present invention, a high-power required for an air bag, mechanical characteristics that can withstand high-temperature gas, and excellent resistance to misalignment at a sewing portion, an air bag comprising the same, and such air Since the manufacturing method which can manufacture the base fabric for bags very economically can be provided, the passenger | crew protection system by an airbag can be spread and promoted.

  The present invention has been intensively studied on the above-mentioned problems, that is, high output, mechanical properties that can withstand high-temperature gas, and excellent resistance to misalignment at the sewing portion, and cover factor, warp direction of the base fabric An airbag base fabric in which the three requirements of the average value of the tensile strength in the warp direction and the average value of the sliding resistance force in the warp direction and the weft direction of the base fabric are within a specific range is one such issue. It was clarified to solve the problem.

  In other words, as the first condition, it has been sought to easily achieve by controlling the expansion rate of the weaving yarn constituting the base fabric within a specific range, and as the first condition, In the weaving process, the warp yarn is driven into 2-4 pieces at the same mouth, and as a third condition, weaving is performed with the weaving tension controlled to 100-200 g / piece, and the three requirements are satisfied. An air bag base fabric has succeeded in solving the above-mentioned problems.

  As the synthetic fiber fabric in the present invention, nylon 6 · 6, nylon 6, nylon 12, nylon 4 · 6, copolymer of nylon 6 and nylon 6 · 6, and polyalkylene glycol on nylon 6 based on the shrinkage inherent to the synthetic fiber. Synthetic fiber fabrics composed of polyamide fibers copolymerized with dicarboxylic acid or amine are used. Among these, nylon 6,6 and nylon 6 are preferable from the viewpoint of impact resistance. Further, nylon 6 · 6 is particularly preferable from the viewpoint of heat resistance. Such fibers may contain various additives usually used for improving the productivity or properties in the production process and processing process of the raw yarn. For example, a heat stabilizer, antioxidant, light stabilizer, smoothing agent, antistatic agent, plasticizer, thickener, pigment, flame retardant and the like can be included.

  The fibers constituting the airbag base fabric used in the present invention have a total fineness in the range of 350 to 600 dtex. The mechanical properties of the base fabric and the misalignment of the sewing portion accompanying the increase in output of the inflator Necessary from mitigation. Furthermore, if it exists in the range of 400-500 dtex, it is especially preferable also from the surface of storage compactness.

  In addition, from the viewpoint of thinning of the base fabric and yarn production, the single yarn cross-sectional shape of the fibers constituting the airbag base fabric of the present invention is an irregular cross-section, particularly the ratio of the major axis to the minor axis of the cross-section, that is, It is important to have a flat cross-sectional shape with an aspect ratio in the range of 2-4. When the yarn having such a flat cross-sectional shape is used, the thickness of the base fabric can be reduced and the storage property can be improved. The yarn composed of a single yarn having such a flat cross-sectional shape is usually elliptical, but may have a flat cross-sectional shape other than an elliptical shape if an aspect ratio of 2 to 4 is satisfied. For example, a left-right asymmetric type such as a rectangle, a rhombus, and a saddle type, as well as a left-right asymmetric type, or a combination type thereof may be used. There may be a hollow portion. If the warp yarn and the weft yarn are flat cross-sectional yarns, it is easy to insert 2 to 4 warp yarns into the round cross-section, and it is good for increasing the density. In addition, the flat cross-sectional yarn can have a special structure in which the weaving yarn constituting the base fabric easily spreads in the longitudinal direction under high tension and satisfies the expansion rate of the present invention, as compared with the round cross-sectional yarn. Therefore, the contact between the woven yarns is promoted, the yarn restraining force at the time of unfolding is increased, and the effect of reducing air permeability and misalignment can be expected. Moreover, it is necessary for the cover factor of the airbag base fabric used for this invention to exist in the range of 2300-2600, in order to make a mechanical characteristic surface and a storage compactness surface compatible, Preferably it exists in the range of 2350-2550. Is good. If the cover factor is less than 2300, the tensile strength required for the airbag is insufficient, and the bag may break when the bag is deployed. In addition, the air permeability increases, and the sliding resistance of the yarn constituting the base fabric tends to decrease. On the other hand, if the cover factor is larger than 2600, there is no problem in terms of mechanical characteristics, but there is a problem in terms of storage compactness. On the other hand, in order to improve the storage performance, it is necessary to increase the density with fine yarns, so that workability and the like deteriorate.

Here, the cover factor is the warp yarn total fineness of the base fabric, D ₁ (dtex). , The warp yarn weave density is N ₁ (lines / 2.54 cm), and the total weft fineness is D ₂ (dtex) 、 Weft weaving density is N ₂ (line / 2.54cm) (D ₁ × 0.9 _{^{) 1/2 × N 1 +}} (D 2 × 0.9 ) Represented by _^1/2 × N ^2. That is, the total fineness of the woven yarn is an essential requirement for satisfying such a cover factor.

  In the airbag fabric of the present invention, it is important that the average value of the tensile strength in the warp yarn direction and the weft yarn direction is in the range of 650 to 750 N / cm. If the average value of tensile strength is less than 650 N / cm, uniform expansion does not occur at the time of expansion of the bag by high-power inflator deployment, stress concentration occurs, and the airbag may burst. On the other hand, if it is larger than 750 N / cm, it is necessary to weave so as not to apply a load to the weaving yarn during weaving of the fabric, resulting in a decrease in productivity. In addition, an extra means for increasing the strength of the woven yarn is required, leading to an increase in cost.

In the airbag fabric of the present invention, it is important that the average value of the slip resistance in the warp yarn direction and the weft yarn direction is in the range of 650N to 950N. Further, in order to reduce the amount of misalignment of the sewn portion due to the high temperature and high output of the inflator, it is particularly preferable that the average value is in the range of 700 to 850N. When the average value of such slip-off resistance is less than 650 N, it is impossible to withstand a high calorie type inflator that has recently been remarkably introduced. Specifically, even if it can withstand a 190 kPa inflator for the driver's seat, in the high calorie type inflator such as 230 kPa, the perforation of the outer peripheral sewing part constituting the airbag becomes remarkable, and the bag internal pressure decreases. In addition to this, hot air leaks from the hole in the sewing part, and there is a risk of occupant damage. Moreover, when larger than 950N, it is necessary to make a base fabric rigid, and a problem arises in terms of storage compactness. Here, the sliding resistance was measured by ASTM D-6479.
The expansion rate of at least one of the woven yarns constituting the airbag fabric of the present invention is preferably in the range of 25 to 45%, more preferably in the range of 30 to 45%. As shown in FIG. 1, the term “expansion rate” as used herein is a numerical value obtained from the following formula from the maximum yarn width a and the minimum yarn width b of the weaving yarn in the plane direction of the base fabric.

Expansion rate of weaving yarn (%) = (a / b−1) × 100
Here, if the expansion rate of the weaving yarn is less than 25%, the weaving yarn cannot be restrained because there is little contact between the weaving yarns constituting the base fabric due to the load on the base fabric when the high heat quantity type inflator is deployed. Therefore, not only the air permeability from the base fabric portion is deteriorated, but also the misalignment at the sewing portion where stress is concentrated is increased, and the internal pressure retention property of the airbag is inferior. Further, if the expansion rate of the weaving yarn is greater than 45%, a problem occurs in production. In other words, a method of shrinking by processing using a yarn having a high shrinkage rate or a method of carrying out high density weaving in the weaving can be considered, but the former uses a high shrinkage yarn, so that the change over time is large and the productivity is good. Absent. In the latter case, a load in weaving is applied, and the productivity deteriorates due to the loom stopping by the fluff and the deterioration of quality.

  Moreover, as a loom used in the weaving process, a water jet room, an air jet room, a rapier room, or the like is used. In particular, in order to increase productivity, a water jet loom that is relatively easy to weave at high speed is preferable.

  The method for manufacturing an air bag base fabric according to the present invention includes at least a weaving process and a finishing process, and is designed to increase the density in the weaving process and drive the warp yarn so as not to apply a load to the weaving thread. Is characterized in that 2 to 4 bottles are placed and the weaving tension is 100 to 200 g / piece. It is particularly preferable that the warp yarns are driven in two at the same opening, and the weaving tension is controlled to 150 to 200 g / unit so that the weaving yarns in the base fabric after weaving are in proper contact with each other, so Since the deviation is reduced and the load on the weaving yarn is reduced, it is particularly preferable in that the base fabric strength can be maintained without lowering the yarn strength until the base fabric weaving. In the weaving method in which the warp yarn is driven into one piece, the contact portion where the weaving yarns rub during weaving is large, so the yarn strength in the base fabric after weaving is reduced, and the base fabric strength is reduced. Not only will this be the cause, but fluffing will occur in the weaving yarn during weaving, which will cause the productivity to deteriorate. On the other hand, if the warp yarn driving is larger than four at the same mouth, it is difficult to weave at high density, and the weaving property is lowered.

  In this way, in the weaving process, the specific number of warp yarns to be driven into the same thread, that is, 2 to 4, and weaving within a specific tension range during the weaving, that is, 100 to 200 g / unit, so that the yarns in the woven fabric And the strength retention of the weaving yarn is increased, and in the airbag deployment by the high power and high temperature inflator, not only the air permeability from the base fabric part is suppressed to the maximum, but also the stress concentration like the sewing part occurs. The present invention has been able to provide an excellent manufacturing method capable of economically manufacturing an airbag base fabric that prevents misalignment at a portion and has excellent impact energy absorption at the initial stage of deployment. That is, due to the same number of warp yarns and the specific tension during weaving, a plurality of warp yarns are flattened by the weft yarns, and the frictional resistance between the warp yarns and the weft yarns is increased. It will be improved.

  The airbag fabric of the present invention can also be used for driver airbags, passenger airbags, rear seat airbags, side airbags, curtain airbags, knee airbags, and the like. . In particular, it is preferably used as a driver seat or passenger seat airbag having a high temperature, high output inflator.

  The air bag base fabric and the air bag of the present invention are characterized by high output, mechanical properties that can withstand high-temperature gas, and excellent anti-missing properties at the sewing portion.

  Next, the present invention will be described in more detail with reference to examples. Various evaluations in the examples were performed according to the following methods.

  Sliding resistance: Based on ASTM D-6479-2002, the maximum strength was measured when a 50 mm × 300 mm fabric sample was pulled at a pulling distance of 200 mm and a pulling speed of 200 mm / min.

  Tear strength: Based on JIS L1096 (8.15.2A-2 method) -1999, the tear strength when pulled at a tensile speed of 200 mm / min was determined.

  Storability evaluation: Measured based on ASTM D-6478-02.

  Air permeability of base fabric: Fluid (air) was adjusted to a pressure of 19.6 kPa and flowed, and the flow rate of air passing at that time was measured.

  Displacement of the outer peripheral sewing part in the development test: The airbag base fabric was cut to obtain two circular base fabrics having a diameter of 760 mm, and the peripheral portions of both sides were sewn to create a driver seat airbag. 1350 dtex nylon 66 thread is used to sew the periphery, and double ring stitching is used, and 1350 dtex nylon 66 thread is used for other sewing such as inflator attachment ports and vent holes that discharge hot gas after deployment. Then, the main sewing was performed. The obtained airbag is folded into a predetermined shape, taken into an airbag device together with a high-power, high-temperature inflator (230 kPa), and the amount of misalignment of the outer peripheral sewing portion after the airbag is inflated and deployed by gas generated from the inflator When the maximum open space was within 1 mm, the case where it exceeded 1 mm was evaluated as x, and the applicability as an airbag was evaluated.

Example 1
Total fineness of 420 dtex, 96 filaments, strength of 8.4 cN / dtex, elongation of 22%, aspect ratio of 3, untwisted nylon 6/6 flat cross-section filament yarn, and water warp loom A woven fabric having a plain structure was obtained by adjusting the weave density of both warps and wefts to 60 / 2.54 cm so that the warp tension was 120 g / strand.

  Next, the fabric was immersed in an 80 ° C. warm water bath containing 0.5 g / l of alkylbenzene sulfonic acid soda and 0.5 g / l of soda ash for 1 minute and then scoured, then dried at 160 ° C. for 1 minute, Adjust the tension so that the weft density of the warp and weft of the base fabric is 59 / 2.54 cm and 61 / 2.54 cm, respectively, and heat set at 190 ° C. for 1 minute to obtain the base fabric for airbag It was.

  The characteristics of the airbag fabric thus obtained are shown in Table 1.

  This airbag fabric was excellent in mechanical properties and anti-displacement, and was also excellent in misalignment of the peripheral sewing portion after the deployment test.

Comparative Example 1
Total fineness of 420 dtex, 96 filaments, strength of 8.4 cN / dtex, elongation of 22%, aspect ratio of 3, untwisted nylon 6/6 flat cross-section filament yarn, and water warp loom Adjust the warp weaving density to 59 / 2.54 cm and weft weaving density to 60 / 2.54 cm so that the warp tension is 170 g / pipe. Obtained.

  Next, this fabric was scoured and dried in the same manner as in Example 1, and the heat set was adjusted so that the warp and weft density of the base fabric was 59 / 2.54 cm and 61 / 2.54 cm, respectively. The temperature was adjusted and heat set at 190 ° C. for 1 minute.

  The characteristics of the airbag fabric thus obtained are shown in Table 1.

  This airbag base fabric had no problem with respect to sliding resistance, but the base fabric strength was low, and the misalignment of the outer peripheral sewing portion after the deployment test was inferior.

Comparative Example 2
Total fineness of 420 dtex, 96 filaments, strength of 8.4 cN / dtex, elongation of 22%, aspect ratio of 3, untwisted nylon 6/6 flat cross-section filament yarn, and water warp loom Adjust the warp weaving density to 54 / 2.54cm and weft weaving density 56 / 2.54cm so that the warp tension is 90g / strand. Obtained. Next, this fabric was scoured and dried in the same manner as in Example 1, and the heat set was adjusted so that the warp and weft densities of the base fabric were 54 / 2.54 cm and 56 / 2.54 cm, respectively. The temperature was adjusted and heat set at 190 ° C. for 1 minute.

  The characteristics of the airbag fabric thus obtained are shown in Table 1.

  This airbag base fabric had no problem with respect to tensile strength, but had low sliding resistance and was inferior in the misalignment of the outer peripheral sewing portion after the deployment test.

Example 2
Total fineness of 470 dtex, 96 filaments, strength 8.4 cN / dtex, elongation 22%, aspect ratio 3, untwisted nylon 6.6 fiber flat cross section filament yarn, using a water jet loom Adjust the weaving density of the warp to 56 / 2.54 cm and the weft density of 57 / 2.54 cm so that the warp tension is 140 g / strand, and the plain weave Obtained. Next, the fabric was immersed in an 80 ° C. warm water bath containing 0.5 g / l of alkylbenzene sulfonic acid soda and 0.5 g / l of soda ash for 1 minute and then scoured, then dried at 160 ° C. for 1 minute, The tension was adjusted so that the weaving density of the warp and weft of the base fabric was 56 / 2.54 cm and 58 / 2.54 cm, respectively, and heat setting was performed at 190 ° C. for 1 minute.

  The characteristics of the airbag fabric thus obtained are shown in Table 1. This airbag fabric was excellent in mechanical properties and anti-displacement, and was also excellent in misalignment of the peripheral sewing portion after the deployment test.

Comparative Example 3
Total fineness of 470 dtex, 96 filaments, strength 8.4 cN / dtex, elongation 22%, aspect ratio 3, untwisted nylon 6.6 fiber flat cross section filament yarn, using a water jet loom Adjust the woven density of the warp to 56 / 2.54 cm and the weft density of 57 / 2.54 cm so that the warp tension is 120 g / strand, and the plain weave Obtained. Next, the fabric was immersed in an 80 ° C. warm water bath containing 0.5 g / l of alkylbenzene sulfonic acid soda and 0.5 g / l of soda ash for 1 minute and then scoured, then dried at 160 ° C. for 1 minute, The tension was adjusted so that the weft density of the warp and weft of the base fabric would be 55 / 2.54 cm and 58 / 2.54 cm, respectively, and heat setting was performed at 190 ° C. for 1 minute.

  The characteristics of the airbag fabric thus obtained are shown in Table 1.

  The airbag fabric was low in tensile strength and slip-off resistance, and was inferior in the misalignment of the outer periphery sewing portion after the deployment test.

Example 3
A total yarn size of 400 dtex, 144 filaments, strength of 8.6 cN / dtex, elongation of 24%, aspect ratio of 1, untwisted nylon 6.6 fiber filament yarns, and two warps driven in the water jet loom The warp tension was adjusted so that the warp tension was 130 g / strand and the weft density of the warp was 60 / 2.54 cm, and the weft density of the weft was 60 / 2.54 cm. . Next, the fabric was immersed in an 80 ° C. warm water bath containing 0.5 g / l of alkylbenzene sulfonic acid soda and 0.5 g / l of soda ash for 1 minute and then scoured, then dried at 160 ° C. for 1 minute, The tension was adjusted so that the weave density of the warp and weft of the base fabric was 60 / 2.54 cm and 61 / 2.54 cm, respectively, and heat setting was performed at 190 ° C. for 1 minute.

  The characteristics of the airbag fabric thus obtained are shown in Table 1.

  This airbag fabric was excellent in mechanical properties and anti-displacement, and was also excellent in misalignment of the peripheral sewing portion after the deployment test.

Comparative Example 4
A total yarn size of 400 dtex, 108 filaments, a strength of 8.5 cN / dtex, an elongation of 22%, an aspect ratio of 1, untwisted nylon 6.6 fiber filament yarn, and one warp driven in the water jet loom The warp tension was adjusted to 90 g / strand so that the warp weave density was 57 / 2.54 cm and the weft weft density was 57 / 2.54 cm to obtain a plain fabric. . Next, the fabric was immersed in an 80 ° C. warm water bath containing 0.5 g / l of alkylbenzene sulfonic acid soda and 0.5 g / l of soda ash for 1 minute and then scoured, then dried at 160 ° C. for 1 minute, The tension was adjusted so that the weft densities of the warp and weft of the base fabric were 58 / 2.54 cm and 57 / 2.54 cm, respectively, and heat setting was performed at 190 ° C. for 1 minute.

  The characteristics of the airbag fabric thus obtained are shown in Table 1.

  The airbag fabric had no problem with tensile strength, but the sliding resistance was low, and the misalignment of the outer peripheral sewing part after the deployment test was inferior.

It is the schematic which shows the base fabric surface for measuring the expansion coefficient of a woven yarn.

Explanation of symbols

a: Maximum thread width b: Minimum thread width

Claims (8)

In the airbag fabric made of synthetic fiber fabric, the cover factor is 2300 to 2600, the average value of the tensile strength in the warp direction and the weft direction of the base fabric is 650 to 800 N / cm, and the warp direction of the base fabric An airbag base fabric, wherein an average value of sliding resistance in the weft direction is in each range of 650 to 950N. The base fabric for an air bag according to claim 1, wherein an expansion rate of at least one of the woven yarns constituting the base fabric is in a range of 25 to 45%. The base fabric for an air bag according to claim 1 or 2, wherein an average value of sliding resistance in the warp yarn direction and the weft yarn direction of the base fabric is in a range of 700 to 850N. The base fabric for an airbag according to any one of claims 1 to 3, wherein an average value of tensile strength in the warp direction and the weft direction of the base fabric is in a range of 700 to 750 N / cm. The airbag base according to any one of claims 1 to 4, wherein the flatness (ratio of the length of the major axis to the minor axis) of the single yarn section of the synthetic fiber is in the range of 2 to 4. cloth. The airbag using the base fabric for airbags in any one of Claims 1-5. A method for producing a fabric for an airbag comprising at least a weaving process and a finishing process, wherein 2 to 4 warp yarns are placed in the weaving process, and the weaving tension is within a range of 100 to 200 g / book. A method for producing a base fabric for an air bag, characterized in that: The method for producing a base fabric for an air bag according to claim 7, wherein the loom used in the weaving process is a water jet loom.

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