JP2015110857A - Air bag base fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide base fabric which suppresses aperture in a bias direction in initial stage of expanding a boundary portion between an expanded part and a non-expanded part when making a bag body and has excellent burst resistance property when making an air bag.SOLUTION: Non-coat air bag base fabric has a 200-1000 N blade combing resistance value in a 45° bias direction relative to warp, a less-than-30 blade combing warp power ECP (W) indicated by the following expression (1), and a less-than-30 blade combing weft power ECP (F) indicated by the following expression (2): ECP(W)=ABS(EC45-ECW)/EC45*100 (1); and ECP(F)=ABS(EC45-ECF)/EC45*100 (2). (In the above expressions (1) and (2), EC45 is a blade combing resistance value in the 45° direction relative to the warp; ECW is a blade combing resistance value in the warp direction; ECF is a blade combing resistance value in the weft direction; and ABS is an absolute value symbol.)

Description

  The present invention relates to an airbag base fabric. More specifically, the present invention relates to an airbag base fabric excellent in anti-burst property.

  Airbags reduce the impact of collisions in the event of accidents and the contact between in-vehicle equipment and the human body. Therefore, the air bag is required to have high airtightness. However, as the airtightness increases, a large stress is applied to the boundary portion between the inflatable portion and the non-inflatable portion. In particular, 45 °, 135 °, 225 °, and 315 ° angular directions (hereinafter referred to as the bias direction) are generally easy to open with respect to the warp, and there is a problem of a decrease in airtightness due to gas leakage from the opening. When analyzing the behavior of the burst, it was found that an opening in the bias direction first occurred, gas was ejected from this part, and this triggered the bag to burst. In particular, when the bag is exposed to a high-temperature gas, such as a Pyrotechnic inflator, resistance to opening in the bias direction is particularly important in order to make the opening easier.

  An improvement with respect to the opening in the bias direction is disclosed in Patent Document 1 below. This is to set the strength in the bias direction to 20% or more of the average strength in the background direction. However, as shown in the above analysis results, the initial opening is important for the burst, and the blade resistance that expresses it is important, but the above document does not introduce the parameter. Moreover, it is not possible to estimate the blade-throwing resistance only with the strength.

  The opening suppression is disclosed in Patent Document 2 below. This is to control the total fineness of the disassembled yarn of the fabric, the pulling resistance of the weaving yarn constituting the fabric, the strength in the weft direction of the base fabric, the elongation at a load of 300 N in the tensile test, the bending resistance, and the basis weight in a specific region. It is intended to improve storage, durability, and deployment speed. Further, in order to obtain such a base fabric, it is preferable to set in a tensioned state in both the direction of warp and the back direction. This is not a serious problem in low-fineness and high-density fabrics because there are many background contact points. However, the fineness of 350 dtex or more is designed so that the number of background intersections is smaller than that of the low-definition product because the fibers are relatively thick. It has been found that the latitudinal tension during heating in such a base fabric may lead to a decrease in hermeticity. Also, in this document, no description is given about the edge-breaking resistance in the bias direction. That is, as described above, the method for suppressing the opening in the bias direction has not yet been studied.

JP 2004-190158 A JP 2012-52280 A

  An object of the present invention is to provide a base fabric excellent in burst resistance when used as an airbag by suppressing the opening in the bias direction at the initial stage of deployment of the boundary portion between the inflatable portion and the non-inflatable portion when the bag is used. It is to be.

The present inventor has found that a base fabric having high resistance to burst can be obtained by adjusting the blade resistance value in the bias direction when an airbag base fabric is used to an appropriate balance, and has led to the present invention. It was.
That is, the present invention is as follows.

[1] A blade-thickness warp index ECP (W) expressed by the following formulas (1) and (2) and a blade-throw resistance, which is 200 N or more and less than 1000 N in a bias direction of 45 ° with respect to the warp. A non-coated airbag base fabric having a weft index ECP (F) of less than 30.
ECP (W) = ABS (EC45−ECW) / EC45 * 100 (1)
ECP (F) = ABS (EC45−ECF) / EC45 * 100 (2)
(In the above formulas (1) and (2), EC45 is the blade resistance value in the 45 ° direction with respect to the warp, ECW is the blade resistance value in the warp direction, and ECF is the blade resistance value in the weft direction. Yes, ABS is an absolute value symbol.)
[2] The non-coated airbag base fabric according to the above [1], wherein the blade-throw resistance value is 380 N or more and less than 1000 N in both the warp direction and the weft direction.
[3] The airbag base fabric according to [1] or [2], wherein the fineness of the decomposed yarn is 350 dtex or more and 750 dtex or less.
[4] The airbag base fabric according to any one of [1] to [3], wherein the cover factor is 2000 or more and 2600 or less.
[5] The airbag base fabric according to any one of [1] to [4], wherein a residual oil ratio is 0.05% by weight or more and 0.2% by weight or less.
[6] The airbag base fabric according to any one of [1] to [5], wherein the ASTM D4032 bending resistance is 10N or more and 30N or less.
[7] The airbag base fabric according to any one of [1] to [6], wherein the tear strength is 160N or more and 300N or less.
[8] The airbag base fabric according to any one of [1] to [7], wherein the single yarn fineness of the constituent fibers is 2 to 7 dtex.
[9] The airbag base fabric according to any one of [1] to [8], wherein the single yarn cross-sectional shape of the constituent fiber is a round cross-section.
[10] The airbag base fabric according to any one of [1] to [9], wherein the constituent yarn has a yarn strength of 8.2 to 11.0 cN / dtex.
[11] The airbag base fabric according to any one of [1] to [10], wherein the constituent fiber is polyamide.
[12] The airbag base fabric according to any one of [1] to [11], which is manufactured by a weaving process including at least the following conditions (a) to (c).
(A) The warp tension during weaving is 0.30 cN / dtex to 0.45 cN / dtex.
(B) Warp tension during scouring is 1.2 N / cm to 3.0 N / cm.
(C) The warp overfeed during heat setting is less than 6%.
[13] An airbag using the airbag base fabric according to any one of [1] to [12].
[14] An airbag device using the airbag according to [13].

  The airbag base fabric of the present invention can prevent the opening from occurring at the boundary portion between the inflated portion and the non-inflated portion where the airtightness tends to be impaired when the bag is deployed, especially in the bias direction where the occurrence of the opening is large.

It is a figure which shows the shape of the airbag used for the expansion | deployment test in the Example. It is a figure explaining the evaluation method of package variation.

Hereinafter, the present invention will be described in detail.
The airbag base fabric of the present invention needs to have a blade resistance value of 200 N or more and less than 1000 N in the direction of 45 ° with respect to the warp. Preferably they are 300N or more and less than 950N, More preferably, they are 600N or more and less than 900N. If there is a portion of less than 200 N, opening of the bag may occur when the bag is deployed, and airtightness may be significantly reduced or burst may occur. When it becomes 1000 N or more, the base fabric becomes hard, and the boundary portion between the inflatable portion and the non-inflatable portion of the bag may be broken due to a decrease in tearing strength, which may burst.
Further, it is preferable that the blade resistance value is 380 N or more and less than 1000 N in both the warp direction and the weft direction. If the blade resistance value is 380 N or more in both the warp direction and the weft direction, the opening due to the load when the bag is unfolded is at a level that is suppressed, which further contributes to improved airtightness and anti-burst properties. If the blade resistance value is less than 1000 N in both the warp direction and the weft direction, it further contributes to maintaining the tearing strength.

  Furthermore, the blade cutting warp index ECP (W) and the blade cutting latitude index ECP (F) represented by the above formulas (1) and (2) must be 30 or less, and the blade cutting resistance must be well balanced. It is. Preferably it is 25 or less, More preferably, it is 20 or less. When there is a portion where ECP (W) and ECP (F) exceed 30, there is a case where stress applied at the time of developing the bag concentrates in the bias direction and induces an opening. It is preferable that the blade resistance has no angle dependency on the weaving direction, and ECP (W) and ECP (F) are most preferably 0.

In order to make the blade resistance value and the blade index within the above ranges, melt spinning of a thermoplastic resin, 30 to 70% by weight of an ester-based smoothing agent and 70 to 30% by weight of an emulsifier as a spinning oil during spinning. An oil agent obtained by emulsifying the composition is applied in an amount of 0.5 to 2.0% by weight based on the yarn weight, and weaving is performed with a warp tension of 0.30 to 0.45 cN / dtex at the time of weaving. Is performed while pulling in the warp direction only at 1.2 N / cm or more, and in a heat set at 100 ° C. or more, the pulling process is performed only in the warp direction without carrying out the width of the tenter, etc. It is preferable to suppress the relaxation to less than 6% with respect to the untreated film.
With respect to the spinning oil, the oil content (residual oil ratio) remaining on the base fabric is preferably 0.2% by weight or less based on the weight of the fabric. If the residual oil ratio is 0.2% by weight or less, it is possible to increase the blade-thrust resistance in the bias direction. On the other hand, it is preferably 0.05% by weight or more, and the tear strength of the base fabric can be maintained high. The composition of the spinning oil is preferably 70 to 30% by weight of an emulsifier, and a composition that can be emulsified is preferable. The amount of 0.5 to 2.0% by weight based on the yarn weight can be reduced to an appropriate amount in the process from weaving to processing.

The warp tension at the time of weaving is preferably 0.30 cN / dtex or more, and can maintain a high blade resistance in the bias direction. On the other hand, 0.45 cN / dtex or less is preferable and weaving stoppage due to warp damage is avoided.
The tension during hot water processing, that is, the warp tension during scouring, is preferably 1.2 N / cm or more only in the warp direction. If it is 1.2 N / cm or more, the bias cutting resistance can be kept high and balanced. In order to normally carry and control the fabric in warm water, 3.0 N / cm or less is more preferable.
It is preferable that the heat set is not pulled as much as possible in the fabric width direction. In the fabric length direction, it is preferable to perform tension control and make the overfeed less than 6%. More preferably, the expression of warp shrinkage of the woven fabric between the weaving machine and the final heat setting treatment is preferably less than 6%. By making the shrinkage in the longitudinal direction of the fabric, that is, the warp direction less than 6%, the blade resistance in the bias direction can be maintained high and balanced.

When the total fineness of the fibers constituting the airbag base fabric of the present invention is 350 or more and less than 750 dtex when the yarn is decomposed, it is more preferable that the base fabric has sufficient flexibility and sufficient strength. If it is less than 350 dtex, the base fabric strength may be lowered. When it is 750 dtex or more, since the contact point of the background is small when the base fabric is used, the bending resistance becomes high, the stress is easily applied to the boundary portion between the expanded portion and the non-expanded portion, and the opening may be increased.
Moreover, by setting the single yarn fineness to 2 to 7 dtex, generation of fluff due to rubbing during weaving can be suppressed, and the range of the blade resistance value when used as a base fabric can be kept within a more preferable range.

  The cross-sectional shape of the single yarn of the woven yarn constituting the base fabric is preferably a round cross section. Since the round cross-section yarn is evenly stressed when stress is applied to the base fabric, a base fabric having high tensile strength can be obtained. The round section here means that the aspect ratio is 1.0 or more and less than 1.5, the definition of the major axis of the aspect ratio indicates the maximum diameter of the section, and the definition of the minor axis indicates the minimum diameter. More preferably, the aspect ratio is 1.0 or more and less than 1.1.

  The cover factor of the base fabric is preferably in a range satisfying 2000 or more and 2600 or less. The cover factor is more preferably 2300 or more and 2500 or less, and most preferably 2350 or more and less than 2450. If it is 2000 or more, it is possible to increase the cutting resistance in the bias direction. If it is 2600 or less, the bending resistance can be suppressed. Here, the cover factor is [√ (warp fineness (dtex)) × warp density (lines / 2.54 cm) + √ (weft fineness (dtex)) × latitude density (lines / 2.54 cm)].

It is preferable that the tear strength of the base fabric is 160N or more and less than 300N. 170N or more is more preferable, and 180N or more is most preferable. At 160N or more, it is possible to avoid the base fabric from being broken at the seam when the airbag is deployed. Moreover, if it is a base fabric of 300 N or less, it will become a flexible base fabric, and it will become advantageous to storage property. The tear strength here is obtained by the single tongue method defined in ISO 13937-2.
If the bending resistance of the airbag base fabric of the present invention is 10N or more and 30N or less, the balance between the storage property and the opening is further improved, which is more preferable. If it is less than 10 N, the binding force between the yarn and the yarn is substantially reduced, and the opening tends to be large. On the other hand, if it is 10N or more, the bag is easy to fold when folded, and the package shape is maintained without being folded back, so that the workability of the storage process is good and the quality of the storage form is improved. Moreover, if it exceeds 30N, it will become difficult to fold and storage property may worsen.

As the fiber used for the airbag base fabric of the present invention, a thermoplastic fiber can be suitably used. Among thermoplastic fibers, polyamide-based fibers are preferred from the viewpoint of mechanical properties and price. Nylon 66 fiber is particularly advantageous because it has a large heat capacity and is difficult to cause a hot gas melting burst from a bias opening when it is used to deploy an air bag with pyrogas, and is more suitable because it balances mechanical properties and price. It is.
Moreover, it is preferable that the fiber used for the airbag base fabric of the present invention has a strength in the raw yarn of 8.2 to 11.0 cN / dtex. More preferably, it is 8.5 to 9.1 cN / dtex. If it is less than 8.2 cN / dtex, the strength when used as a base fabric may be lowered, which is not preferable. On the other hand, if it exceeds 11.0 cN / dtex, the fiber molecules are excessively oriented, and when a force in the transverse direction is applied to the fiber axis in weaving or the like, fluff is likely to occur, which is not preferable.

EXAMPLES Next, although an Example and a comparative example demonstrate this invention further in detail, this invention is not limited only to these Examples. First, various measurement methods and evaluation methods in the present invention will be described.
(1) The cutting resistance of the base fabric was measured according to ASTM-D6479.
(2) The tear strength of the base fabric was measured by JIS L-1096 8.15 A-1.
(3) Evaluation of the stop during weaving was performed using a LWT710 manufactured by Toyota Industries Corporation, 2.3 m wide, with a loom rotation speed of 600 rpm, and the stop was 5 times / day or more x 2 times or less. ◯, and 3 to 4 times △.
(4) The total fineness of the decomposed yarn was measured in accordance with JIS L1096 Annex 14, by disassembling the woven fabric and setting the sample length to 25 cm for the processed disassembled yarn.
(5) The strength of the raw yarn was measured by JIS L1013 8.5.1 method.
(6) The bending resistance of the base fabric was measured according to ASTM D4032-94.

(7) Opening test (cold gas) is performed by sewing the circular bag shown in FIG. 1 with a 1680 dtex single-thread sewing thread with a main stitch of 55 stitches / 10 cm. Using the system, He gas was instantaneously supplied into the bag with a test pressure of 10 MPa, a test gas volume of 1 L, and an orifice of 0.6 inch, and the opening of the bag sewing portion thereafter was measured with calipers and evaluated according to the following criteria.
Further, the development test opening (inflator) is the same circular bag as described above, and is developed with a pyrotechnic inflator showing 200 kPa in a 60 L test tank, and the opening of the bag sewing portion after that is measured with a caliper. Evaluated by criteria.
○: Opening after opening is less than 3 mm and the sewing thread does not break. Δ: Opening after opening is 3 mm or more and the sewing thread does not break. ×: State after opening the sewing thread is broken. The numerical values described in Tables 1 and 2 are angles with respect to the warp in the direction of opening.

(8) Package loosening: Two circular cloths having a diameter of 760 mm were cut out from the base cloth, and the peripheral edges were sewn together to produce the airbag (1) as shown in FIG. The airbag was folded as shown in FIG. 2 (B), and was held for 5 minutes by applying a load of 200 g with a 300 mm square glass plate (2) and a weight (3). Thirty seconds after removing this load, the degree of opening of the folded package due to rebound was observed and evaluated as follows.
(X): The package opens and protrudes an area of 150 mm square.
(Δ): The package opens and does not protrude a 150 mm square area, but the open height is 2.5 times or more the folding height (X in FIG. 2B).
(◯): The open height of the package does not reach 2.5 times the folding height (X in FIG. 2B) and is within the 150 mm square area.
(9) Residual oil ratio: 15 g of the base fabric was sampled and used as a sample. Soxhlet extraction of the base fabric sample was performed using cyclohexane as a solvent. The extracted solvent was evaporated by heating, and the dry residue weight was measured with a precision balance to obtain the oil weight. The oil weight was divided by the sample weight to obtain a residual oil ratio (% by weight).

[Example 1]
Polyamide 66 resin was melt-spun at 300 ° C., and while cooling, a spinning oil of 60% by weight of ester-based smoothing agent and 40% by weight of nonionic surfactant was applied to the fiber as an aqueous dispersion of 25% by weight of oil. Next, the film was drawn 4.9 times with a 200 ° C. hot drawing roll, and then entangled with compressed air to obtain an original yarn having a fineness of 470 dtex and a single yarn number of 136. The strength of this raw yarn was 8.6 cN / dtex, the elongation at break was 20.0%, and the oil agent adhesion rate was 0.8% by weight. Using this raw yarn, without any gluing, LWT710 manufactured by Toyota Industries Corporation, warp set density 51 / inch, weft set density 52 / inch, counter width 230cm, warp tension 0.35cN / dtex, loom rotation speed Plain weaving was performed at 600 rpm. For both ears, two 33 dtex nylon 66 monofilaments were used as entanglement yarns. In addition, eight 33 dtex nylon 66 monofilaments were woven in plain weave inside the entangled yarn as additional yarn to obtain a raw material fabric. Thereafter, the film was retained in an 80 ° C. hot water bath under a tension of 400 N for 60 seconds and dried on a heating drum at 110 ° C. for 40 seconds to obtain a woven fabric having a target weaving density of 55 yarns / inch. As a result of measuring the residual oil ratio of this fabric, it was 0.1% by weight with respect to the fabric weight. The obtained fabric was evaluated and the results are shown in Table 1. In addition, Table 1 also shows the evaluation of weaving properties at the time of weaving.

[Example 2]
Plain weaving was performed using the nylon 66 fiber described in Example 1 at a warp setting density of 53 / inch, a weft setting density of 53 / inch, a counter width of 230 cm, a warp tension of 0.35 cN / dtex, and a loom rotation speed of 500 rpm. . For both ears, a raw material was obtained in the same manner as in Example 1. Thereafter, it was treated in a hot water bath at 80 ° C. under a tension of 400 N for 60 seconds and dried on a heating drum at 110 ° C. for 40 seconds to obtain a woven fabric having an intended weaving density of 57 yarns / inch. As a result of measuring the residual oil ratio of this fabric, it was 0.12% by weight with respect to the fabric weight. Various properties were measured and evaluated for the obtained woven fabric, and the results are shown in Table 1. In addition, Table 1 also shows the evaluation of weaving properties at the time of weaving.

[Example 3]
Using the nylon 66 fiber described in Example 1, a plain weaving was performed at a warp setting density of 49 yarns / inch, a weft yarn setting density of 50 yarns / inch, a counter width of 230 cm, a warp tension of 0.35 cN / dtex, and a loom rotation speed of 600 rpm. . For both ears, a raw material was obtained in the same manner as in Example 1. Thereafter, it was treated in a hot water bath at 80 ° C. under a tension of 400 N for 60 seconds and dried on a heating drum at 110 ° C. for 40 seconds to obtain a woven fabric having a target woven density of 53 yarns / inch. As a result of measuring the residual oil amount ratio of this fabric, it was 0.09% by weight with respect to the fabric weight. Various properties were measured and evaluated for the obtained woven fabric, and the results are shown in Table 1. In addition, Table 1 also shows the evaluation of weaving properties at the time of weaving.

[Example 4]
Polyamide 66 resin was melt-spun at 300 ° C., and while cooling, a spinning oil of 60% by weight of ester-based smoothing agent and 40% by weight of nonionic surfactant was applied to the fiber as an aqueous dispersion of 25% by weight of oil. Subsequently, the film was drawn 4.9 times with a 200 ° C. hot drawing roll, and then entangled with compressed air to obtain an original yarn having a fineness of 470 dtex and a filament number of 216. The strength of the raw yarn was 8.7 cN / dtex, the elongation at break was 19.5%, and the oil agent adhesion was 0.85% by weight. Using this raw yarn, a warp setting density of 51.5 yarns / inch, a weft yarn setting density of 52.5 yarns / inch, an anti-width of 230 cm, and a warp tension of 0.35 cN / inch are used in an LWT710 manufactured by Toyota Industries Corporation without gluing. Plain weaving was performed at dtex and a loom speed of 600 rpm. For both ears, eight 33 dtex nylon 66 monofilaments were used as entanglement yarns. In addition, eight 33 dtex nylon 66 monofilaments were woven in plain weave inside the entangled yarn as additional yarn to obtain a raw material fabric. Then, it was treated in a hot water bath at 80 ° C. under a tension of 400 N for 60 seconds and dried on a heating drum at 110 ° C. for 40 seconds to obtain a woven fabric having an intended weaving density of 55 yarns / inch. As a result of measuring the residual oil ratio of this fabric, it was 0.1% by weight with respect to the fabric weight. The obtained fabric was evaluated and the results are shown in Table 1. In addition, Table 1 also shows the evaluation of weaving properties at the time of weaving.

[Example 5]
Polyamide 66 resin was melt-spun at 300 ° C., and while cooling, a spinning oil of 60% by weight of ester-based smoothing agent and 40% by weight of nonionic surfactant was applied to the fiber as an aqueous dispersion of 25% by weight of oil. Thereafter, the film was drawn 4.8 times with a 200 ° C. hot drawing roll and then entangled with compressed air to obtain an original yarn having a fineness of 470 dtex and a filament number of 72. The strength of the raw yarn was 8.6 cN / dtex, and the elongation at break was 20.2%. Using this raw yarn, without using glue, LWT710 manufactured by Toyota Industries Corporation, warp set density 51.5 / inch, weft set density 52.5 / inch, counter width 230cm, warp tension 0.30cN / dtex Plain weaving was performed at a loom speed of 600 rpm. For both ears, eight 33 dtex nylon 66 monofilaments were used as entanglement yarns. Also, two 33 dtex nylon 66 monofilaments were woven in plain weave inside the entangled yarn as additional yarn to obtain a raw material fabric. Then, it was treated in a hot water bath at 80 ° C. under a tension of 400 N for 60 seconds and dried on a heating drum at 110 ° C. for 40 seconds to obtain a woven fabric having an intended weaving density of 55 yarns / inch. As a result of measuring the residual oil ratio of this fabric, it was 0.1% by weight with respect to the fabric weight. Various properties were measured and evaluated for the obtained woven fabric, and the results are shown in Table 1. In addition, Table 1 also shows the evaluation of weaving properties at the time of weaving.

[Example 6]
Polyamide 66 resin was melt-spun at 300 ° C., and while cooling, a spinning oil of 60% by weight of ester-based smoothing agent and 40% by weight of nonionic surfactant was applied to the fiber as an aqueous dispersion of 25% by weight of oil. Thereafter, the film was drawn 4.4 times with a 200 ° C. hot drawing roll, and then entangled with compressed air to obtain an original yarn having a fineness of 470 dtex and 136 filaments. The strength of the raw yarn was 8.0 cN / dtex and the elongation at break was 25.5%. Using this raw yarn, without any gluing, LWT710 manufactured by Toyota Industries Corporation, warp setting density 51.5 / inch, weft setting density 53.0 / inch, counter width 230cm, warp tension 0.30cN / dtex Plain weaving was performed at a loom speed of 600 rpm. For both ears, eight 33 dtex nylon 66 monofilaments were used as entanglement yarns. Also, two 33 dtex nylon 66 monofilaments were woven in plain weave inside the entangled yarn as additional yarn to obtain a raw material fabric. Then, it was treated in a hot water bath at 80 ° C. under a tension of 400 N for 60 seconds and dried on a heating drum at 110 ° C. for 40 seconds to obtain a woven fabric having an intended weaving density of 55 yarns / inch. As a result of measuring the residual oil ratio of this fabric, it was 0.1% by weight with respect to the fabric weight. Various properties were measured and evaluated for the obtained woven fabric, and the results are shown in Table 1. In addition, Table 1 also shows the evaluation of weaving properties at the time of weaving.

[Example 7]
Using the nylon 66 fiber described in Example 1, plain weaving with a warp set density of 46 / inch, a weft set density of 45.5 / inch, a counter width of 230 cm, a warp tension of 0.35 cN / dtex, and a loom rotation speed of 600 rpm. went. For both ears, two 33 dtex nylon 66 monofilaments were used as entanglement yarns. Further, as a reinforcing yarn, two 33 dtex nylon 66 monofilaments were woven in a plain weave inside the entangled yarn to obtain a raw material fabric. Thereafter, it was treated in a hot water bath at 80 ° C. under a tension of 400 N for 60 seconds and dried on a heating drum at 110 ° C. for 40 seconds to obtain a woven fabric having a target woven density of 49 yarns / inch. As a result of measuring the residual oil ratio of this fabric, it was 0.09% by weight with respect to the fabric weight. Various properties were measured and evaluated for the obtained woven fabric, and the results are shown in Table 1. In addition, Table 1 also shows the evaluation of weaving properties at the time of weaving.

[Example 8]
Polyethylene terephthalate resin was melt-spun at 290 ° C., and while cooling, a spinning oil of 60% by weight of ester-based smoothing agent and 40% by weight of nonionic surfactant was applied to the fiber as an aqueous dispersion of 25% by weight of oil. Thereafter, the film was drawn 6.0 times with a 200 ° C. hot drawing roll, and then entangled with compressed air to obtain an original yarn having a fineness of 550 dtex and 96 filaments. The strength of the raw yarn was 7.0 cN / dtex, the elongation at break was 20%, and the adhesion amount of the oil agent was 0.75% by weight. As a result of weaving and heat setting similar to Example 3 using this raw yarn, the residual oil ratio was 0.08% by weight relative to the weight of the fabric. Various properties were measured and evaluated for the obtained woven fabric, and the results are shown in Table 1. In addition, Table 1 also shows the evaluation of weaving properties at the time of weaving.

[Comparative Example 1]
Using the nylon 66 fiber described in Example 1, plain weaving with a warp set density of 46.5 / inch, a weft set density of 46 / inch, a counter width of 230 cm, a warp tension of 0.25 cN / dtex, and a loom rotation speed of 600 rpm. went. For both ears, two 33 dtex nylon 66 monofilaments were used as entanglement yarns. Also, two 33 dtex nylon 66 monofilaments were woven in plain weave inside the entangled yarn as additional yarn to obtain a raw material fabric. Thereafter, it was treated in a hot water bath at 80 ° C. under a tension of 400 N for 60 seconds and dried on a heating drum at 110 ° C. for 40 seconds to obtain a woven fabric having a target woven density of 49 yarns / inch. As a result of measuring the residual oil ratio of this fabric, it was 0.08% by weight with respect to the fabric weight. Various properties were measured and evaluated for the obtained woven fabric, and the results are shown in Table 2. Table 2 also shows the evaluation of weaving properties during the weaving. The warp tension of the woven fabric is low, and the resistance to cutting in the bias direction is low. When the air bag was expanded with pyrogas, the seam was broken by hot gas at the seam.

[Comparative Example 2]
Using the nylon 66 fiber described in Example 1, a plain weave weaving with a warp set density of 40 / inch, a weft set density of 39.5 / inch, an opposite width of 230 cm, a warp tension of 0.32 cN / dtex, and a loom rotation speed of 600 rpm. went. For both ears, two 33 dtex nylon 66 monofilaments were used as entanglement yarns. Also, two 33 dtex nylon 66 monofilaments were woven in plain weave inside the entangled yarn as additional yarn to obtain a raw material fabric. Thereafter, it was treated in a hot water bath at 80 ° C. under a tension of 400 N for 60 seconds and dried on a heating drum at 110 ° C. for 40 seconds to obtain a woven fabric having a target weaving density of 42 yarns / inch. As a result of measuring the residual oil ratio of this fabric, it was 0.07% by weight with respect to the fabric weight. Various properties were measured and evaluated for the obtained woven fabric, and the results are shown in Table 2. Table 2 also shows the evaluation of weaving properties during the weaving. The weaving density of the woven fabric is low and the cutting resistance in the bias direction is low. When the air bag was expanded with pyrogas, the seam was broken by hot gas at the seam. The airbag package was easy to fold back and the storage quality was poor.

[Comparative Example 3]
Using the fiber of Example 1, 2% by weight of polyacrylic acid was glued with respect to the yarn weight during aging, and a warp setting density of 52 yarns / inch and a weft yarn setting density of 53.5 yarns / LWT710 manufactured by Toyota Industries Corporation. plain weaving was performed at an inch, an anti-width of 230 cm, a warp tension of 0.35 cN / dtex, and a loom rotation speed of 600 rpm. For both ears, two 33 dtex nylon 66 monofilaments were used as entanglement yarns. In addition, eight 33 dtex nylon 66 monofilaments were woven in plain weave inside the entangled yarn as additional yarn to obtain a raw material fabric. Then, without immersing in a hot water bath, it was directly dried on a heating drum at 110 ° C. for 40 seconds to obtain a woven fabric having an intended weaving density of 55 pieces / inch. As a result of measuring the oil agent ratio of this fabric, it was 0.5% by weight with respect to the fabric weight. The obtained woven fabric was evaluated and the results are shown in Table 2. Table 2 also shows the evaluation of weaving properties during the weaving. High blade resistance in the bias direction, but low tear strength. In the deployment of the air bag pyrogas, the seam was broken by the hot gas and the base fabric was broken at the seam.

[Comparative Example 4]
Using the nylon 66 fiber described in Example 1, plain weaving was performed at a warp setting density of 51 yarns / inch, a weft yarn setting density of 52 yarns / inch, a counter width of 230 cm, a warp tension of 0.25 cN / dtex, and a loom rotation speed of 600 rpm. . For both ears, two 33 dtex nylon 66 monofilaments were used as entanglement yarns. Also, two 33 dtex nylon 66 monofilaments were woven in plain weave inside the entangled yarn as additional yarn to obtain a raw material fabric. After that, it stays in a 80 ° C hot water bath with a minimum conveying force of 50N at 60N for 60 seconds, and is dried on a heating drum at 110 ° C for 40 seconds. The target weaving density is 555.5 / inch weft. / Inch fabric was obtained. As a result of measuring the residual oil ratio of this fabric, it was 0.05% by weight with respect to the fabric weight. Various properties were measured and evaluated for the obtained woven fabric, and the results are shown in Table 2. Table 2 also shows the evaluation of weaving properties during the weaving. In scouring, the fabric is almost free-shrinking, has a low blade resistance in the bias direction, and has a poor balance. When the air bag was expanded with pyrogas, the seam was broken by hot gas at the seam.

  The airbag base fabric of the present invention has a very high industrial utility value because the opening of the boundary portion between the inflatable portion and the non-inflatable portion is highly suppressed even in the bias direction.

Claims (14)

The edge resistance value is 200N or more and less than 1000N in the bias direction of 45 ° with respect to the warp, and the edge warp index ECP (W) and the edge weft index ECP represented by the following expressions (1) and (2) A non-coated airbag base fabric in which (F) is less than 30.
ECP (W) = ABS (EC45−ECW) / EC45 * 100 (1)
ECP (F) = ABS (EC45−ECF) / EC45 * 100 (2)
(In the above formulas (1) and (2), EC45 is the blade resistance value in the 45 ° direction with respect to the warp, ECW is the blade resistance value in the warp direction, and ECF is the blade resistance value in the weft direction. Yes, ABS is an absolute value symbol.)   The non-coated airbag base fabric according to claim 1, wherein the blade resistance value is 380 N or more and less than 1000 N in both the warp direction and the weft direction.   The airbag base fabric according to claim 1 or 2, wherein the fineness of the decomposed yarn is 350 dtex or more and 750 dtex or less.   The airbag base fabric according to any one of claims 1 to 3, wherein the cover factor is 2000 or more and 2600 or less.   The airbag base fabric according to any one of claims 1 to 4, wherein a residual oil ratio is 0.05 wt% or more and 0.2 wt% or less.   The airbag base fabric according to any one of claims 1 to 5, wherein the ASTM D4032 bending resistance is 10N or more and 30N or less.   The airbag base fabric according to any one of claims 1 to 6, wherein the tear strength is 160N or more and 300N or less.   The airbag base fabric according to any one of claims 1 to 7, wherein the single yarn fineness of the constituent fibers is 2 to 7 dtex.   The airbag base fabric according to any one of claims 1 to 8, wherein a single yarn cross-sectional shape of the constituting fiber is a round cross-section.   The airbag base fabric according to any one of claims 1 to 9, wherein the yarn strength of the constituent fibers is 8.2 to 11.0 cN / dtex.   The airbag base fabric according to any one of claims 1 to 10, wherein the constituent fiber is polyamide. The airbag base fabric according to any one of claims 1 to 11, wherein the airbag base fabric is manufactured by a weaving process including at least the following conditions (a) to (c).
(A) The warp tension during weaving is 0.30 cN / dtex to 0.45 cN / dtex.
(B) Warp tension during scouring is 1.2 N / cm to 3.0 N / cm.
(C) The warp overfeed during heat setting is less than 6%.   The airbag using the airbag base fabric as described in any one of Claims 1-12.   An airbag device using the airbag according to claim 13.

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