KR20160029826A - Fabric for airbag - Google Patents

Abstract

It is an object of the present invention to provide a bag for an air bag which is capable of suppressing the mesh gap at the boundary between the expanded portion and the non-expanded portion at a high temperature while improving the flexibility at room temperature, Characterized in that the air bag bubble of the present invention has a cover factor of 2250 or more and 2500 or less and a bulk density of 700 kg / m 3 or more and 900 kg / m 3 or less, It is air bubbles.
((Density) + (density)) 占 (fiber fineness)

Description

{FABRIC FOR AIRBAG}

The present invention relates to fabrics for airbags. More particularly, the present invention relates to a fabric for airbags having high airtightness at high temperatures.

The airbag is to reduce the impact of an accident at the time of an accident or the contact between the equipment and the human body. Air bags are required to be hermetically sealed since the air bags rapidly expand and take a human body without tearing, and a cushioning effect is required. In particular, the airtightness of the boundary between the inflated portion and the non-inflated portion affects the airtightness of the bag, but the airtightness of the above-described portion is particularly important, especially in an environment where hot gas is present during operation of the inflator. Improvement in the airtightness of the base fabric is disclosed in Patent Documents 1 and 2 below. Patent Document 1 is a method for suppressing movement of a yarn by improving mutual binding force between fibers. However, in the above document, the mesh pores at high temperatures have no substrate. Further, simply by increasing the binding force between the fibers, the movement of the fibers is excessively suppressed in the case of high-density fabrics, and the tear strength may decrease. Patent Document 2 discloses that after a multifilament composed of flat monofilaments is woven, it is shrunk at an inclined tension of 0.08 cN / dtex or less. However, the fabric structure in which the flat yarns are arranged in parallel in the flat axial direction may reduce the tear property and the like, and there is no description about the mesh void at high temperature.

Patent Document 1: JP-A-2012-52280 Patent Document 2: Japanese Patent Application Laid-Open No. 2005-105445

It is an object of the present invention to improve the flexibility of a fabric at room temperature while suppressing the mesh voids at high temperatures at the boundary between the expanded portion and the nonexpanded portion when the bag is used as an air bag, To provide a fabric.

The inventors of the present invention have found that by controlling the bulk density of a fabric, mesh voids can be suppressed at a high temperature at the boundary between the expanded portion and the nonexpanded portion of the bag in a high density fabric, , And came to the invention.

That is, the present invention is as follows.

(1) A non-coated airbag bubble characterized in that the cover factor represented by the following formula is 2250 or more and 2500 or less and the bulk density is 700 kg / m 3 or more and 900 kg / m 3 or less.

((Density) + (density)) 占 (fiber fineness)

(2) The uncoated air bag bubble according to the above item 1, wherein the tear strength is 150 N or more and less than 300 N.

(3) The uncoated air bag bubble according to item (1) or (2) above, wherein the fiber surface has an alkylphosphate ester salt present in an amount of 0.05 ppm by weight or more and less than 3 ppm by weight based on the actual weight.

(4) The uncoated air bag bubble according to any one of the above items 1 to 3, characterized in that the fiber surface has an alkyl sulfate in an amount of 1 ppm by weight or more and less than 12 ppm by weight based on the actual weight.

(5) The uncoated airbag bubble described in any one of (1) to (4) above, wherein the airbag is woven using a yarn strand having a single cross-sectional shape of a circular cross section.

(6) The uncoated air bag bubble according to any one of (1) to (5) above, wherein the dynamic air permeability of the air bubbles is 400 mm / s or less.

(7) The uncoated air bag bubble according to any one of (1) to (6) above, wherein the size of the seam mesh opening at 100 ° C is 12 mm or less.

(8) The uncoated air bag bubble described in any one of (1) to (7) above, wherein the air bubble is composed of a yarn strand having a single yarn fineness of 2 dtex or more and 7 dtex or less.

(9) The uncoated air bag bubble as described in any one of (1) to (8) above, wherein the fibers constituting the bubble are polyamide 66. [

(10) The uncoated airbag bubble described in any one of (1) to (9) above, which is subjected to wet treatment under tension of 1 N / cm or more after being woven.

(11) An uncoated airbag made of the bubble described in any one of (1) to (10).

Since the air bubble of the present invention is a high density fabric having a specific bulk density, mesh voids at the boundary portion between the expanded portion and the non-expanded portion when the airbag is formed are suppressed to realize high airtightness of the airbag, And the tear strength is also improved. Particularly, it is suitable for an air bag apparatus using a high-temperature gas at a high output.

Hereinafter, the present invention will be described in detail.

It is necessary that the fabric density of the bubble of the present invention is in a range that the cover factor satisfies 2250 or more and 2500 or less. The cover factor is more preferably 2300 or more and less than 2500, and most preferably 2350 or more and less than 2450. If it is 2250 or more, the mesh space at the boundary portion between the expanded portion and the non-expanded portion becomes large, and airtightness of the normal pressure will not be impaired. If it is 2500 or less, the flexibility is not impaired. The bulk density of the bubbles is required to be not less than 700 kg / m 3 and not more than 900 kg / m 3. More preferably less than 750 kg / m3 and less than 900 kg / m3, more preferably less than 750 kg / m3 and less than 850 kg / m3, and most preferably 780 kg / m3 or more and 830 kg / m3. If it is 700 kg / m < 3 > or more, the mesh space at the boundary portion between the expanded portion and the non-expanded portion when the bag is made white does not become large, and the airtightness of high pressure is not damaged. Further, in the case of 900 kg / m < 3 > or less, flexibility is not impaired and the storage ability is kept small. In order to set the cover factor and the bulk density within the above range, for example, the density of the warp yarns is set to 50 / inch or more and the weft yarn is set to have the same density, and the tension of the warp yarns at the time of weaving is set to a tension of 0.3 cN / , And then performing a set process thereafter. It is important to treat bubbles without loosening at the time of setting, and the tension at that time is more than 1 N / cm. That is, it is important to adopt a processing condition for increasing the cover factor, increasing the bulk density, and making the fabric structure three-dimensionally closed with a mesh.

The dynamic air permeability of the bubbles of the present invention is preferably 400 mm / s or less. More preferably not more than 300 mm / s, and most preferably not more than 200 mm / s. Below 400 mm / s, flexibility and airtightness can be achieved at the same time. The method of measuring the dynamic airflow amount will be described later.

The void of the bubble of the present invention at 100 占 폚 is 12 mm or less. Preferably 10 mm or less, and most preferably 8 mm or less. If it is 12 mm or less, the airtightness at the time of bagging can be expanded without greatly impairing the airtightness. The method of measuring the pores of the core mesh will be described later.

The bubble of the present invention preferably has a tear strength of 150 N or more and less than 300 N. More preferably 180 N or more, and most preferably 200 N or more. And when it is 150 N or more, it is advantageous in suppressing the mesh displacement. Further, when the bubbles are less than 300 N, the degree of freedom of the fibers is large and the bubbles become flexible. Here, the tear strength is a single tongue method specified in ISO13937-2.

It is preferable that the surface of the fiber constituting the bubble of the present invention contains 0.05 ppm by weight or more and less than 3.0 ppm by weight of the alkyl phosphate ester and 1 ppm by weight or more and less than 12 ppm by weight of the alkyl sulfate. More preferably, the alkylphosphoric acid ester salt is present in an amount of not less than 0.1 ppm by weight and less than 2.0 ppm by weight, and the alkylsulfuric acid salt is present in an amount of not less than 2 ppm by weight and less than 8 ppm by weight, By weight, and the alkyl sulfate amount is 2 ppm by weight or more and less than 5 ppm by weight.

When the amount of the alkyl phosphate ester is 0.05 ppm by weight or more, static friction between the fibers does not become excessively large, which is advantageous for improving maintenance of the tear strength. If it is less than 3.0 ppm by weight, it is advantageous not to increase the mesh space at the boundary between the expanded portion and the nonexpanded portion when the bag is made into a bag. On the other hand, if the amount of the alkylsulfate is 1 ppm by weight or more, static friction between the fibers does not become excessively large, which is advantageous for improving maintenance of tear strength. If it is less than 12 ppm by weight, it is advantageous not to increase the mesh space of the boundary portion between the expanded portion and the non-expanded portion when formed into a bag.

It is preferable that one of the alkyl phosphate ester salt and the alkyl sulfate salt is present in the above-mentioned appropriate amount. However, it is preferable that the two are present together, and more effective in a smaller amount.

The alkyl moiety of the alkyl phosphate preferably has a carbon number of 8 or more and 18 or less, and may have a side chain, and may also include an ethylene oxide chain. As the salt, a sodium salt, a calcium salt and a tertiary amine salt are preferable. The alkyl moiety of the alkylsulfate preferably has 8 to 18 carbon atoms, may have a side chain, and may contain an ethylene oxide chain. As the salt, a sodium salt and a calcium salt are preferable.

The method of applying the alkylphosphate and the alkylsulfate to be used in the bubbles of the present invention is not particularly limited, but it is preferable that the alkylphosphate and the alkylsulfate are present only on the surface of the fiber by a method of coating the surface of the fiber. As a method of coating on the surface of the fiber, a method which is carried out in a spinning step and a regular preparation step can be employed, and it is general to apply the above-described components together with a spinning oil. The radial emulsion component is not particularly limited, but includes, for example, an ester of a divalent organic acid and a monohydric alcohol, an ester of a monovalent organic acid and a polyvalent alcohol, and an organic oxide or an ethylene oxide block in an alcohol, It is generally possible to use ethylene oxide or propylene oxide as the ester of cured castor oil or derivative thereof and mono- or polyhydric alcohol as well as alkyl ethers of ethylene oxide or propylene oxide.

The liquid to be applied may be in the form of a dispersion or solution in an organic solvent such as hydrocarbon or water, but it is economically advantageous to use water as a solvent, and safety is also effective. Further, the fiber surface refers to the monofilament surface of the fibers constituting the bubbles.

The monofilament fineness of the fibers used in the bubbles of the present invention is preferably 2 dtex or more and 7 dtex or less. More preferably 3 dtex or more and less than 7 dtex, and most preferably 3 dtex or more and less than 6 dtex. In the case of 2 dtex or more, the airtightness is good, and it is advantageous for suppressing the mesh gap at the time of bag development. If it is 7 dtex or less, it is difficult to receive single yarn damage at the time of processing such as weaving, and it is advantageous to obtain a bubble of good quality.

The fiber used in the bubble of the present invention is preferably a circular cross section of the monofilament section constituting the fiber. In the case of the ring section, bubbles having high tear strength and tensile strength can be obtained because stress is applied uniformly when stress is applied to the bubbles. Here, the aspect ratio refers to an aspect ratio of 1.0 or more and less than 1.1, and the definition of the major axis of the aspect ratio is the maximum diameter of the cross section, and the definition of the minor axis is the minimum diameter.

The fiber material used in the bubble of the present invention is preferably a thermoplastic fiber, and polyester and polyamide 66 fibers can be most suitably used in terms of fiber property and handling property.

In the production of the bubbles of the present invention, it is preferable to carry out wet treatment after weaving. The wet treatment is preferably carried out under tension, and the tension at this time is preferably 1 N / cm or more. More preferably 1.5 N / cm or more, and most preferably 2 N / cm or more. When it is 1 N / cm or more, an increase in thickness due to shrinkage of bubbles in hot water during drying or drying at the time of drying is suppressed, and a fabric structure in which the mesh is closed three-dimensionally is obtained. Therefore, the airtightness under high pressure can be maintained satisfactorily. If it is too large, uniform shrinkage may be damaged, and wrinkles of the bubbles may occur and non-uniformity of the fabric density may be increased. Therefore, it is preferably 4 N / cm or less. The wet treatment described here may be a treatment after the scouring after weaving or a treatment of immersion only in water and / or hot water, followed by a subsequent drying treatment, and may be carried out during the tenter treatment. In addition, the drying treatment of the air bubbles in a wet state after the weaving is also included in the wet treatment mentioned in the present invention. Further, in the step of wetting the bubbles, it is preferable that the use of no alkali does not cause excessive dropping of the emulsion on the surface of the bubbles.

Example

EXAMPLES Next, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples. Various measuring methods and evaluation methods in the present invention are as follows.

(1) Weaving property was evaluated using the following criteria, using a LWT710 manufactured by Toyoko Shotoku Co., Ltd., with a width of 2.3 m, spinning speed of 600 rpm or 500 rpm.

Suspended 5 times / day or more: ×

Suspension from 3 times to 4 times / day: △

Suspension less than 2 times / day: ○

(2) The hardness of the bubbles was measured according to ASTM-D4032.

(3) Tear strength of bubbles was measured according to ISO13937-2.

(4) The dynamic air permeability of the bubbles was measured using an FX3350 aeration tester manufactured by TEXTEST Co., Ltd. according to ASTM-D6476, and the test head was 400 cc and the peak pressure was 95 to 105 kPa, Skill.

(5) The bulk density of the bubbles was calculated by measuring the weight and thickness of the bubbles of 10 cm 2 (ISO-5084 test pressure 1 ㎪) and by weight and volume.

(6) At room temperature, the core mesh pore size was measured by cutting two chunks of 38 cm x 15 cm from the sample fabric, facing each other, leaving a part of 1 cm from the end of the long side, and a sewing thread of 1350 dtex Suture with 50 needle / dm needle stitching and connect yarn ends. A sample was prepared by aligning the wefts in the radial directions and aligning the weights in the upper direction. Thereafter, the core gap length when a load of 1500 N was applied at a speed of 100 mm / min in Tensilon manufactured by A & D was measured regularly.

(7) The core pore size at 100 ° C was the same as that of the room pore size measurement at room temperature. After maintaining for 1 minute in a dedicated thermostatic chamber set at 100 ° C, a load of 1500 N The pore length of the core mesh was measured regularly.

(8) As the residual amount, 15 g of bubbles were sampled and Soxhlet extraction was carried out using cyclohexane as a solvent. Next, the extracted solvent was heated and volatilized, and the residue weight was measured with a precision clearance to determine the residual amount. The value obtained by dividing the weight by the weight of the sample was regarded as the residual amount.

(9) The adhesion amount of the alkyl phosphate ester on the fiber surface was determined from phosphorus concentration by ICP.

(10) The amount of the alkyl sulfate on the fiber surface was determined from the amount of sulfuric acid by ion chromatography.

(11) The appearance of the finished bubble was visually judged by the naked eye, and when there was no abnormality in appearance, the phenomenon was described.

(12) The overall judgment was made by considering the flexibility of the pores (hardness) and the degree of airtightness (dynamic aeration amount), and the results were evaluated as good, good, and poor.

[Example 1]

Polyamide 66 resin was melt-spun at 300 占 폚, and 0.3 wt% of an alkyl (C12-16) phosphoric acid amine salt and 0.1 wt% of an alkyl (meth) acrylate were added to a spinning emulsion containing 60 wt% of an ester type smoothing agent and 40 wt% C12 to S16) Sulfuric acid sodium salt was added in an amount of 0.8% by weight based on the actual weight, and then stretched to 4.9-fold by a heat stretching roll at 200 DEG C and then entangled with compressed air to obtain a yarn having a fineness of 470 dtex, Only 136 yarns were obtained. The yarn strength was 8.6 cN / dtex and the elongation at break was 20.0%. Using this, we set the slope set density of 51 / inch, the weft density of 52 / inch, the half width of 230 ㎝, the slope tension of 0.32 cN / dtex, the spinning machine rotation speed of 600 rpm with LWT710 manufactured by TOYOTA KK We made plain weaving. Two of the 33 dtex nylon 66 monofilaments were used as the entangled yarn in each of the ear portions. In addition, as an increased yarn, eight 33 dtex nylon 66 monofilaments were weighed in the inside of the interlaced yarn to obtain a raw material roll having a width of 2 m. Thereafter, the fabric was heated in a hot water bath at 80 DEG C for 180 seconds under a tension of 400 N, and dried at 110 DEG C for 40 seconds using a heating drum to obtain a fabric having an intended fabric density of 55 yarns per inch. The residual amount of the fabric was measured and found to be 0.1% by weight based on the weight of the fabric. The obtained bubbles were subjected to various characteristics measurement and evaluation, and the results are shown in Table 1. Table 1 also shows the weavability evaluation at the time of weaving.

[Example 2]

A raw material roll was obtained in the same manner as in Example 1 except that the nylon 66 fiber described in Example 1 was used and the warp tension was 0.26 cN / dtex. This was processed in the same manner as in Example 1 to obtain a desired fabric. The residual amount of the fabric was measured and found to be 0.1% by weight based on the weight of the fabric. The obtained bubbles were subjected to various characteristics measurement and evaluation. The results and the weighed evaluation are shown in Table 1.

[Example 3]

A raw material roll was obtained in the same manner as in Example 1 except that the nylon 66 fiber described in Example 1 was used and the warp tension was 0.35 cN / dtex. This was processed in the same manner as in Example 1 to obtain a desired fabric. The residual amount of this fabric was measured and found to be 0.11% by weight based on the weight of the fabric. The obtained bubbles were subjected to various characteristics measurement and evaluation. The results and the weighed evaluation are shown in Table 1.

[Example 4]

Using nylon 66 fibers described in Example 1, plain weaving was performed at an inclination set density of 53 pieces / inch, a weft set density of 53 pieces / inch, a half width of 230 cm, a warp tension of 0.32 cN / dtex and a loom rotation speed of 500 rpm . A raw material roll was obtained in the same manner as in Example 1 with the double-ear portion. Thereafter, the fabric was heated in a hot water bath at 80 DEG C for 180 seconds under a tensile force of 400 N, and dried at 110 DEG C for 40 seconds using a heating drum to obtain a fabric having an intended fabric density of 57 yarns per inch. The residual amount of the fabric was measured and found to be 0.12% by weight based on the weight of the fabric. The obtained bubbles were subjected to various characteristics measurement and evaluation, and the results are shown in Table 1. Table 1 also shows the weavability evaluation at the time of weaving.

[Example 5]

Using nylon 66 fibers described in Example 1, plain weaving was performed at an inclination set density of 49 / inch, a weft set density of 50 / inch, a half width of 230 cm, a warp tension of 0.32 cN / dtex and a loom rotation speed of 600 rpm . A raw material roll was obtained in the same manner as in Example 1 with the double-ear portion. Thereafter, the fabric was heated in a hot water bath at 80 DEG C for 180 seconds under a tensile force of 400 N, and dried at 110 DEG C for 40 seconds using a heating drum to obtain a fabric having a desired fabric density of 53 yarns per inch. The residual amount of this fabric was measured and found to be 0.09% by weight based on the bubble weight. The obtained bubbles were subjected to various characteristics measurement and evaluation, and the results are shown in Table 1. Table 1 also shows the weavability evaluation at the time of weaving.

[Example 6]

The polyamide 66 resin was melt-spun at 300 占 폚 and, while cooling, a radial emulsion containing 0.3% by weight of an alkyl (C12-16) phosphoric acid salt and 4% by weight of an alkyl (C12-16) %, And then stretched to 4.7 times with a thermal stretching roll at 200 DEG C, and entangled with compressed air to obtain 216 yarns of a fineness of 470 dtex. The yarn strength was 8.7 cN / dtex and the elongation at break was 19.5%. Using this yarn, weaving was performed in the same manner as in Example 1. As a result, the residual rate was 0.1% by weight based on the weight of the bubble. The obtained bubbles were subjected to various characteristics measurement and evaluation, and the results are shown in Table 1. Table 1 also shows the weavability evaluation at the time of weaving.

[Example 7]

The polyamide 66 resin was melt-spun at 300 占 폚 and, while cooling, a radial emulsion containing 0.3% by weight of an alkyl (C12-16) phosphoric acid salt and 4% by weight of an alkyl (C12-16) %, And then stretched by 4.8 times with a thermal stretching roll at 200 DEG C, and entangled with compressed air to obtain yarns of a fineness of 470 dtex and a single yarn number of 72 yarns. The yarn strength was 8.6 cN / dtex and the elongation at break was 20.2%. Using this yarn, weaving was performed in the same manner as in Example 1. As a result, the residual rate was 0.11% by weight based on the weight of the bubble. The obtained bubbles were subjected to various characteristics measurement and evaluation, and the results are shown in Table 1. Table 1 also shows the weavability evaluation at the time of weaving.

[Example 8]

Polyamide 66 resin was melt-spun at 300 占 폚 and, while cooling, a radial emulsion containing 3% by weight of an alkyl (C12-16) phosphoric acid amine salt and 4% by weight of an alkyl (C12-16) %, And then stretched to 4.9 times with a thermal stretching roll at 200 DEG C, and then entangled with compressed air to obtain a yarn having a fineness of 470 dtex and a single yarn number of 136 yarns. The yarn strength was 8.5 cN / dtex and the elongation at break was 21.0%. Using this yarn, weaving was performed in the same manner as in Example 1. As a result, the residual rate was 0.11% by weight based on the weight of the bubble. The obtained bubbles were subjected to various characteristics measurement and evaluation, and the results are shown in Table 1. Table 1 also shows the weavability evaluation at the time of weaving.

[Example 9]

The polyamide 66 resin was melt-spun at 300 占 폚 and, while cooling, a radial emulsion containing 0.05% by weight of an alkyl (C12-16) phosphoric acid salt and 4% by weight of an alkyl (C12-16) %, And then stretched to 4.8 times with a thermal stretching roll at 200 DEG C, and entangled with compressed air to obtain a yarn of a fineness of 470 dtex and a single yarn number of 136 yarns. The yarn strength was 8.6 cN / dtex and the elongation at break was 20.5%. Using this yarn, weaving was performed in the same manner as in Example 1. The obtained bubbles were subjected to various characteristics measurement and evaluation, and the results are shown in Table 1. [ Table 1 also shows the weavability evaluation at the time of weaving.

[Example 10]

The polyamide 66 resin was melt-spun at 300 占 폚 and, while cooling, a radial emulsion containing 0.3% by weight of an alkyl (C12-16) phosphoric acid salt and 10% by weight of an alkyl (C12-16) %, And then stretched to 4.8 times with a thermal stretching roll at 200 DEG C, and entangled with compressed air to obtain a yarn of a fineness of 470 dtex and a single yarn number of 136 yarns. The yarn strength was 8.6 cN / dtex and the elongation at break was 20%. Using this yarn, weaving was performed in the same manner as in Example 1. As a result, the residual rate was 0.12% by weight based on the weight of the bubble. The obtained bubbles were subjected to various characteristics measurement and evaluation, and the results are shown in Table 1. Table 1 also shows the weavability evaluation at the time of weaving.

[Example 11]

The polyamide 66 resin was melt-spun at 300 占 폚 and, while cooling, a radial emulsion containing 0.3% by weight of an alkyl (C12-16) phosphoric acid salt and 2% by weight of an alkyl (C12-16) %, And then stretched to 4.8 times with a thermal stretching roll at 200 DEG C, and entangled with compressed air to obtain a yarn of a fineness of 470 dtex and a single yarn number of 136 yarns. The yarn strength was 8.7 cN / dtex and the elongation at break was 20.5%. Using this yarn, weaving was performed in the same manner as in Example 1. As a result, the residual rate was 0.08% by weight based on the weight of the bubble. The obtained bubbles were subjected to various characteristics measurement and evaluation, and the results are shown in Table 1. Table 1 also shows the weavability evaluation at the time of weaving.

[Example 12]

A polyethylene terephthalate resin was melt-spun at 290 占 폚 and, while cooling, a radial emulsion containing 0.3% by weight of an alkyl (C12-16) phosphoric acid salt and 1% by weight of an alkyl (C12-16) %, And then stretched 6.0 times by a thermal stretching roll at 200 DEG C and then entangled with compressed air to obtain a yarn with a fineness of 550 dtex and a single number of 96 yarns. The yarn strength was 7.0 cN / dtex and the elongation at break was 20%. Using this yarn, weaving was performed in the same manner as in Example 1. As a result, the residual rate was 0.08% by weight based on the weight of the bubble. The obtained bubbles were subjected to various characteristics measurement and evaluation, and the results are shown in Table 1. Table 1 also shows the weavability evaluation at the time of weaving.

[Example 13]

Polyamide 66 resin was melt-spun at 300 占 폚 and, while cooling, emulsion emulsion containing not only an alkyl (C12-16) phosphoric acid amine salt but only 4% by weight of an alkyl (C12-16) 0.8% by weight, and then stretched at 4.9 times with a thermal stretching roll at 200 DEG C, and entangled with compressed air to obtain a yarn having a fineness of 470 dtex and a single yarn number of 136 yarns. The yarn strength was 8.6 cN / dtex and the elongation at break was 20.0%. Using this yarn, weaving was performed in the same manner as in Example 1 to obtain a fabric having a target fabric density of 55 yarns per inch. The residual amount of the fabric was measured and found to be 0.1% by weight based on the weight of the fabric. The obtained bubbles were subjected to various characteristics measurement and evaluation, and the results are shown in Table 2. [ Table 2 also shows the weavability evaluation at the time of weaving.

[Example 14]

A polyamide 66 resin was melt-spun at 300 占 폚 and, while cooling, emulsion emulsion containing 0.3% by weight of an alkyl (C12-16) phosphoric acid salt and no sodium (C12-16) 0.8% by weight, and then stretched at 4.9 times with a thermal stretching roll at 200 DEG C, and entangled with compressed air to obtain a yarn having a fineness of 470 dtex and a single yarn number of 136 yarns. The yarn strength was 8.6 cN / dtex and the elongation at break was 20.2%. Using this yarn, weaving was performed in the same manner as in Example 1 to obtain a fabric having a target fabric density of 55 yarns per inch. The residual amount of the fabric was measured and found to be 0.1% by weight based on the weight of the fabric. The obtained bubbles were subjected to various characteristics measurement and evaluation, and the results are shown in Table 1. The obtained bubbles were subjected to various characteristics measurement and evaluation, and the results are shown in Table 2. [ Table 2 also shows the weavability evaluation at the time of weaving.

[Example 15]

Except that polyamide 66 resin was melt-spun at 300 占 폚 and 0.8% by weight based on the actual weight of a radial emulsion not containing an alkyl (C12-16) phosphoric acid amine salt and an alkyl (C12-16) , And the yarn was spun by the same method as in Example 1 to obtain a yarn having a fineness of 470 dtex and a single yarn number of 136 yarns. The yarn strength was 8.6 cN / dtex and the elongation at break was 21.0%. Using this yarn, weaving was performed in the same manner as in Example 1 to obtain a fabric having a target fabric density of 55 yarns per inch. The residual amount of this fabric was measured and found to be 0.11% by weight based on the weight of the fabric. The obtained bubbles were subjected to various characteristics measurement and evaluation, and the results are shown in Table 2. [ The weavability evaluation at the time of weaving is also shown in Table 2.

[Example 16]

Using the yarn of Example 1, weaving was performed in the same manner as in Example 1 to obtain bubbles. This was immersed in an aqueous solution of 7.4 g / L sodium hydroxide at 60 占 폚, passed through a steam bath at 80 占 폚 for 30 seconds, washed with water at 90 占 폚 for 1 minute, dried for 70 seconds with a heating roll at 100 占 폚 and wound , And a fabric having a fabric density of 55 yarns per inch was obtained. The residual amount of this fabric was 0.01% based on the weight of the fabric. The obtained bubbles were evaluated, and the results are shown in Table 2. The weavability evaluation at the time of weaving is also shown in Table 2.

[Example 17]

Using the yarn of Example 1, weaving was performed in the same manner as in Example 1 to obtain bubbles. This was treated in a hot water bath at 80 DEG C for 180 seconds under a tension of 200 N and dried at 110 DEG C for 40 seconds using a heating drum to obtain a fabric having a desired fabric density of 55 yarns per inch. The residual amount of this fabric was measured and found to be 0.11% by weight based on the weight of the fabric. The obtained bubbles were subjected to various characteristics measurement and evaluation, and the results are shown in Table 2. [ Table 2 also shows the weavability evaluation at the time of weaving.

[Example 18]

Using the yarn of Example 1, weaving was performed in the same manner as in Example 1 to obtain bubbles. This was treated in a hot water bath at 80 DEG C for 180 seconds under a tensile force of 800 N and dried at 110 DEG C for 40 seconds using a heating drum to obtain a fabric having an intended fabric density of 55 yarns per inch. The residual amount of the fabric was measured and found to be 0.10% by weight based on the weight of the fabric. The obtained bubbles were subjected to various characteristics measurement and evaluation, and the results are shown in Table 2. [ Table 2 also shows the weavability evaluation at the time of weaving.

[Comparative Example 1]

Polyamide 66 resin was melt-spun at 300 占 폚 and, while cooling, a radial emulsion containing 0.3% by weight of an alkyl (C12-16) phosphoric acid salt and 4% by weight of an alkyl (C12-16) %, And then stretched to 4.9 times with a thermal stretching roll at 200 DEG C, and then entangled with compressed air to obtain a yarn having a fineness of 470 dtex and a single yarn number of 136 yarns. The yarn strength was 8.6 cN / dtex and the elongation at break was 20.0%. Using this yarn, the warp set density was 49 / inch, the weft density was 48 / inch, the half width was 230 cm, the warp tension was 0.32 cN / dtex, the loom speed was 600 rpm . Two pairs of 33 dtex nylon 66 monofilaments were used as alternate yarns. In addition, eight raw 33 dtex nylon 66 monofilaments were woven in the inside of the entangled yarn as a sieve to obtain a raw material roll. Thereafter, the fabric was heated in a hot water bath at 80 DEG C for 180 seconds under a tensile force of 400 N, and dried at 110 DEG C for 40 seconds using a heating drum to obtain a desired fabric having a fabric density of 51 yarns per inch. The residual amount of the fabric was measured and found to be 0.1% by weight based on the weight of the fabric. The obtained bubbles were subjected to various characteristics measurement and evaluation, and the results are shown in Table 2. [ Table 2 also shows the weavability evaluation at the time of weaving. The cover factor was low and the seam opening was large.

[Comparative Example 2]

The same procedure as in Example 1 was carried out except that the warp tension was 0.18 cN / dtex. The obtained bubbles were subjected to various characteristics measurement and evaluation, and the results are shown in Table 2. [ Table 2 also shows the weavability evaluation at the time of weaving. Low bulk density, and high air permeability.

[Comparative Example 3]

The same yarn as in Example 1 was used to weave the yarn in the same manner as in Example 1. Thereafter, the yarn was treated in a hot water bath at 80 DEG C for 180 seconds under a tension of 50 N, and heated at 110 DEG C for 40 seconds Followed by drying to obtain a fabric having a desired fabric density of 55 ply per inch. The residual amount of this fabric was measured and found to be 0.08% by weight based on the bubble weight. The obtained bubbles were subjected to various characteristics measurement and evaluation, and the results are shown in Table 2. [ Table 2 also shows the weavability evaluation at the time of weaving. It has low bulk density, high air permeability, and high temperature mesh porosity.

[Comparative Example 4]

The same yarn as in Example 1 was used to perform weaving and hot water cleaning in the same manner as in Example 1 and then subjected to a galvanizing treatment at a temperature of 150 DEG C and a pressure of 7 MPa to obtain a fabric having a density of 55 / inch < / RTI > The residual amount of the fabric was measured and found to be 0.10% by weight based on the weight of the fabric. The obtained bubbles were subjected to various characteristics measurement and evaluation, and the results are shown in Table 2. [ Table 2 also shows the weavability evaluation at the time of weaving. The bulk density is remarkably high, and the ventilation amount is suppressed, but the tear strength is inferior.

As can be seen from Tables 1 and 2, the mesh of the present invention is difficult to open, but those outside the scope of the present invention are susceptible to mesh opening.

The uncoated airbag fabric of the present invention has a large industrial value because it suppresses the mesh pores at the boundary portion between the inflated portion and the non-inflated portion and is also excellent in flexibility.

Claims (11)

Wherein the cover factor represented by the following formula is from 2250 to 2500 and the bulk density is from 700 kg / m 3 to 900 kg / m 3.
((Density) + (density)) 占 (fiber fineness) The airbag according to claim 1, wherein the tear strength is not less than 150 N and less than 300 N. The aircoated airbag according to any one of claims 1 to 3, wherein the fiber surface has an alkyl phosphoric acid ester salt in an amount of 0.05 ppm by weight or more and less than 3 ppm by weight based on the actual weight. 4. The airbag according to any one of claims 1 to 3, wherein the fiber surface is present in an amount of not less than 1 ppm by weight and less than 12 ppm by weight of alkyl sulfate based on the actual weight. The uncoated air bag bubble as claimed in any one of claims 1 to 4, wherein the air bubble is woven using a yarn strand having a round cross-section. The uncoated air bag bubble according to any one of claims 1 to 5, characterized in that the dynamic airflow amount of the air bubbles is 400 mm / s or less. 7. The airbag according to any one of claims 1 to 6, characterized in that the seam mesh opening size at 100 DEG C is 12 mm or less. The uncoated air bag bubble according to any one of claims 1 to 7, characterized in that it is made of a yarn strand having a monofilament fineness of 2 dtex or more and 7 dtex or less. The airbag according to any one of claims 1 to 8, characterized in that the fibers constituting the air bubble are polyamide 66. 10. The airbag according to any one of claims 1 to 9, characterized in that it is subjected to wet treatment under tension of 1 N / cm or more after weaving. An uncoated airbag made of the bubble of any one of claims 1 to 10.