KR101200903B1 - An inflatable fabrics and an air-bag - Google Patents

Abstract

The present invention includes an inflated portion having a component part by a gas, an unexpanded portion for supporting the inflated portion, and a joining portion forming a boundary between the inflated portion and the non-expanded portion, wherein the inflated portion includes two fabric layers separated from each other. Consists of a double fabric comprising, the fastening portion includes a mirror-like tissue that the two separate layers of the fabric are joined to form a mirror image around the intersection point, the tissue of the non-expansion portion is a step It relates to a component double fabric with a gas comprising an airbag and the same.

In the present invention, the non-expanded tissue is composed of a step weaving step by step cross-stitching, the fastening part is formed by forming two fabric layers separated from each other in a mirror image around the intersection, all the fabric layers composed of plain weave excellent weaving It can provide performance and smoothness, and can improve the pressure-resistance performance of double fabrics when air bags are deployed.

Double fabric, non-expansion, seam, step seam, mirror image, air bag

Description

Partial double fabrics and airbags by gas {AN INFLATABLE FABRICS AND AN AIR-BAG}

TECHNICAL FIELD The present invention relates to a two-part double fabric by gas, and more particularly, to a fabric having excellent gas part properties such as a vehicle air bag or a life jacket.

Fabrics with parts can be used for automotive airbags, life vests, and the like. In particular, when the vehicle rolls over and rolls over, the side curtain type airbags in which the curtain-type airbags are unfolded in the side windows of the vehicle for the purpose of preventing the driver's or passenger's head from being injured by the windshield or the side structure of the vehicle. Partial fabric is used. The side curtain type airbags should be inflated for at least 5 seconds or more while the car is rolled to protect passengers safely in an accident, in which case a fabric with a part is useful.

The method of manufacturing a product having air component characteristics such as a vehicle air bag is to use two fabrics by sewing, fusion or bonding, and to use a double fabric in which two layers of fabrics are partially joined by a connection point. It is divided into methods.

However, as in the first method, a method of manufacturing an air-part product by sewing two fabrics, fusing them by heat or ultrasonication, or bonding them with an adhesive is performed by manufacturing a separate fabric after fabricating two layers of fabric. A process, a fusion process, or an adhesion process is required, resulting in a complicated process and an increase in manufacturing cost.

In order to solve this problem, in recent years, a method of manufacturing an air part product such as an air bag using a double fabric having a second air part property has been attempted.

Fabrics with component parts by air, such as air, have a junction between the two separate layers and the two layers. A fabric having a system closed by a junction point serves to firmly bind the two layers when each single layer expands rapidly by air or the like, and there should be no outflow of gas in the portion where the two layers follow. For this purpose, 3X3 basket weave or 2X2 basket weave is mainly used as the structure of the seam in double fabric. In addition, the non-expansion portion bounded by the stitching portion is to support the inflation portion, two layers of the double-woven fabric separated around the junction point is maintained, or a plain weave tissue or the like is generally used.

However, according to the above method, when using the double-tissue seam texture as a general basket weave or the non-expanded seam tissue as a conventional double-woven form or plain weave, the two layers separated by the gas are the seam upon expansion. There is a problem in that the outflow of the gas in the air and thus increase the air permeability, or the yarn pulling phenomenon is so severe that weaving is difficult to solve the problem.

The present invention allows two separate fabric layers of a double fabric to form a mirror image around the intersection point at the joint and the non-expansion portion is composed of a step joint weaving step by step, thereby providing excellent pressure resistance characteristics and weaving and smoothness. To improve, and to provide a double fabric excellent in durability and stability and an air bag comprising the same.

The present invention includes an inflated portion having a component part by a gas, an unexpanded portion for supporting the inflated portion, and a joining portion forming a boundary between the inflated portion and the non-expanded portion, wherein the inflated portion includes two fabric layers separated from each other. Consists of a double fabric comprising, the fastening portion includes a mirror-like tissue that the two separate layers of the fabric are joined to form a mirror image around the intersection point, the tissue of the non-expansion portion is a step It provides a partary double fabric with a gas comprising a.

The present invention also provides an airbag comprising the double fabric.

Hereinafter, the present invention will be described in more detail.

According to the present invention, the manufacturing process may be improved during the manufacture of a shock-absorbing final product such as an air bag, and the tightening force through the joint portion and the non-expansion portion may be enhanced to suppress the air leakage phenomenon when the layer separation portion is expanded in the air. The present invention relates to a double fabric having a gas component.

By combining two separate fabric layers of the double fabric forming a mirror image around the intersection point and constructing a step bonding fabric which cross-engages the non-expanded tissue stepwise, the fabric is joined when the double fabric is expanded by air. The present invention has been found to effectively prevent air from escaping into portions, improve physical properties such as pressure resistance performance, and provide a double fabric and airbags having excellent performance through a more efficient weaving process.

Hereinafter, with reference to the accompanying drawings, it will be described in detail the dual fabric of the present invention and the airbag including the same so that those skilled in the art can easily practice.

1 is a complete organizational chart (a) having two separate plain weave planes and an expanded pattern (b) composed of a double weave of the present invention. 2 is a cross-sectional view of a tissue forming the double fabric of the present invention.

As shown in Figure 2, the double fabric of the present invention is composed of a layer separating portion (A, B) consisting of two fabric layers separated from each other, and a junction point (C) for joining the two fabric layers separated from each other Is done. The dual fabric with gaseous parts of the present invention simultaneously weaves two plain weave layers A and B separated from each other on a weaving machine using a jacquard loom, and a joining part for joining the two fabric layers ( It is woven by being joined while forming a mirror image around the intersection point of C). At this time, in order to further solidify the contact point, the contact point crossing in the mirror image may be repeated two or more times, preferably three to six times. In this case, it is better to prevent air from escaping into the pocket.

The double fabric of the present invention includes an inflated part having a part property by gas, an inflated part supporting the inflated part, and a joining part forming a boundary between the inflated part and the inflated part, wherein the inflated part is a conventional method. It is possible to weave double weave through (Fig. 3 B). Preferably, the expandable part with the gas comprises two separate layers of fabric which are woven simultaneously using a loom.

The fabric layer of the present invention is intended primarily for the part-by-gas component, and the joining portion prevents the gas that generates the part from escaping between two separate fabric layers and withstands the pressure of the expanding gas. .

In this case, in the two separate fabric layers, the inclination of the top layer forms the weft and tissue points of the bottom layer, the weft of the top layer forms the inclination and tissue points of the bottom layer, or the inclination of the bottom layer. A tissue point tissue line or tissue surface formed by forming the weft and tissue points of the top layer or the weft of the bottom layer forming the slope and tissue points of the top layer so that the two fabric layers form one layer in the tissue part. . The tissue that makes such a connection is called a connection organization, and when the connection organization appears in dots, it is called a connection point.When the connection organization appears in a line, it is called a connection line, and when the connection organization appears in a plane, it is called a connection surface. Connection and connection surface are called connection parts. In addition, the tissue point refers to a portion where the warp and weft cross each other up and down to form a fabric, the intersection point in the junction of the present invention refers to the area where two fabric layers separated from each other to form a mirror image and intersect. It can be called a junction point.

The fabric layer of the present invention is intended primarily for the part-by-gas component, in particular, the joining portion prevents the gas that generates the part from escaping between two separate fabric layers, and serves to withstand the pressure of the expanding gas. do. Accordingly, the stitching tissue in the double fabric of the present invention can be obtained by forming a mirror image of each other in the same manner as in Fig. 4, the upper and lower tissues of the double weave around the joint portion as shown in Figure 2, preferably these By forming two or more adjacent to each other, it is possible to prevent the medium from flowing out when inflated by a gas such as air.

As shown in Figure 3, in the present invention, the fabric comprising a tissue to be joined with the tissue separated into the top layer and the bottom layer can be divided into layered tissue (A, B) and stitched tissue (C), also of the pattern According to the arrangement, the area B closed by the layered tissue, i.e., the swollen area and the connective tissue C, the external tissue A of the closed area by the connective tissue, and its own parts, such as The space supporting the closed area B is divided into three spaces.

In addition, in the double fabric of the present invention, the non-expansion portion serves to support the inflation portion, and is composed of a step weaving step by step cross-stitching, so as to reinforce the connection portion to enhance the sealing property of the expansion portion having a part by the gas It is. In addition, the non-expansion part includes the remaining portion except for the expansion portion having a part by the gas and the joining portion to join it, it is composed of the above step stitching fabric to make the tension of the entire fabric evenly.

In particular, in the present invention, the term "stage weaving" refers to the double weave layer and the single weave in partial stitching in a single weave around two separate fabric layers, such as the layered part (A) in FIG. 2. It means that the tie layer is cross-stitched step by step, it means to include a discontinuous connection site through the step cross-stitching. In the non-expanded portion of the present invention, the step stitching fabric maintains the stepwise cross stitching between the double fabric layer and the single layer of stitching layer, and is applied in a plurality of linear forms or honeycomb or stamina, round or oval, or triangle or sadie. It can be applied in various shapes such as a shape.

The non-expansive portion of the present invention includes a "stitched weaving" that is stepwise cross-stitched with the double fabric layer, as shown in Figure 5, the stitching layer forming the "stitched weaving" is a tissue of 1X1, tissue of 2X2 , 3X3 tissues, runners, double woven fabrics, and one or more blended fabrics thereof.

In the non-expandable portion of the present invention, the step stitching fabric has a width of the stitching tissue bonded to the double fabric layer of 0.3 to 2.5 mm, preferably 0.5 to 2 mm, most preferably 0.7 to 1.5 mm. . Also, the stitching width of the step stitching fabric is 1 to 12 pixels, preferably 2 to 9 pixels, and most preferably 3 to 7 pixels as the yarn pixels in the whole fabric divided into a plurality of pixels. desirable. If the width of the stitching tissue of the step joint weaving in the non-expansion portion is less than 0.3 mm, air may be injected into the air bag to escape the internal air during deployment, and it is difficult to secure an effective pressure retention rate for the air bag. On the other hand, if the width of the connective tissue is greater than 2.5 mm in the step stitching of the non-expanded portion, excessive tension is applied to the double fabric including the non-expanded portion, so that weaving becomes difficult.

In addition, it is preferable that the continuous length in one direction of the connective tissue in the step fastening is 1 to 10 mm, preferably 4 to 7 mm, most preferably about 5 to 6 mm. When the continuous length is less than 1 mm in one direction of the stitching tissue in the step stitching fabric, the air blocking effect is less when the airbag is deployed. If the length is larger than 10 mm, excessive tension is applied to the double fabric including the non-expanded portion, making it difficult to weave.

In the present invention, the step weaving is preferably maintained between 3 and 35 mm, preferably 5 to 30 mm, and most preferably 10 to 25 mm, between the joint part and the joint part. Do. In the step weaving, the spacing between the stitching portions is 10 to 150 pixels, preferably 20 to 130 pixels, most preferably about 40 to 110 pixels, as the yarn pixels in the whole fabric divided into a plurality of pixels. It is preferable to become. If the spacing between the interlocking portions is less than 3 mm, the tension caused by the non-expansion portion becomes excessive, so that weaving of the double fabric is difficult, and when the spacing between the interlocking portions is greater than 35 mm, the airbag By injecting air into the air during deployment, the internal air can escape, and it is difficult to secure an effective pressure retention rate for the airbag.

In the present invention, the type of yarn material such as double weave, single weave, partial weave, and step weave is used in the manufacture of double weave, but is not particularly limited, preferably nylon 66, polyethylene terephthalate (PET), poly It is preferably one selected from the group consisting of propylene and polyester.

In addition, the present invention may include a resin coating layer coated on the surface of the double fabric having air component properties in order to lower the amount of air discharged. The resin used for the coating may be a resin commonly used for fiber coating, and preferably includes a silicone resin, urethane resin, or a mixture thereof, and the silicone resin coating is more preferable for maintaining airtightness and strength at development. Do.

The resin coating is to effectively fill the gap of the double fabric fabric, it can be carried out on one or both sides of the fabric surface. As a coating method, the conventional coating method can be performed by the knife coat method, the doctor blade method, the spray coating method, etc., Preferably the knife coat method is used. In addition, the coating can be carried out a multi-stage coating to perform a plurality of coatings . When the undercoat and the topcoat are combined with the multi-step coating, not only the airtightness is improved but also the thickness of the fabric is reduced compared to the coating amount, thereby improving the flexibility effectively. In particular, the coating is preferably carried out two times by undercoating and topcoating on the same side of the fabric surface.

At this time, the coating amount of the resin is preferably 30 g / ㎡ to 150 g / ㎡. If the coating amount is less than 30 g / ㎡ the air bag is a lot of air flow can not maintain the swollen state for more than 5 seconds at a constant pressure after deployment. In addition, when the coating amount exceeds 150 g / ㎡, the airbag is too thick to worsen the storage capacity, and when the airbag is deployed, the airbag may not come into contact with the structure, and thus may not function.

Particularly, the double fabric of the present invention is a step weaving fabric in which two fabric layers separated from each other, which are bounded by the inflation and non-expansion portions, are formed in a mirror image around the intersection, and the non-expansion portions are also cross-stitched stepwise. By construction, the occurrence of unevenness in the woven double fabric can be significantly reduced to provide excellent coating performance and process efficiency.

Thus, in the double fabric of the present invention, it is very important for the airtightness to minimize the stretching force due to high pressure air or the like, so that the structure for the point where the two layers are separated or the point at which the joining starts as described above is very important. The formation method of is the most important factor in the design of fabrics with parts.

In addition, the double fabric of the present invention solved such a problem by using a plain weave having a high resistance to extension to the external tensile force as a fabric layer, preferably the cover factor of the cross-sectional fabric of the high density of 1900 or more according to the following formula 1 Weaving can further improve the airtightness of the air bag. When the cover factor is less than 1900, there is a problem that the air is easily discharged to the outside during the expansion of the air.

[Equation 1]

Cover Factor (CF)

In the gaseous part double fabric of the present invention, the thickness of the fabric surface of one fabric layer constituting the double fabric measured by the ASTM D 1777 method is 0.5 mm or less, and the stiffness measured by the ASTM D 4032 circular band method. It is preferable that the value of is 3.5 kgf or less. When the thickness of the one fabric layer exceeds 0.5 mm, there is a problem that it is difficult to store when used as a vehicle air bag, and when the lecture degree exceeds 3.5 kgf, there is a problem that does not develop in a normal form by air pressure when used as a vehicle air bag. .

When the double fabric of the present invention is injected into the air bag at an instantaneous pressure of 25 bar and the air bag internal pressure is measured, the initial maximum pressure must be 40 KPa or more, and after 6 seconds, the holding pressure must be 25 KPa or more to function as a side curtain type air bag. have. In order to prevent the rupture when the side curtain type airbag is deployed by the inflat of high temperature and high pressure, the connection part (C of FIG. 2) should be at least 1000 N / 5cm when the bar strength of ASTM D 5822 is measured. In addition, in order to minimize the amount of air escaped to the joint during development, and to prevent melting of the yarn due to high heat, the elongation at break of ASTM D 5822 should be 50% or less. In particular, since side curtain type airbags have a relatively large coating amount compared to general airbags, it is very important to maintain the strength when the fabric is worn due to the vibration of the vehicle in order to function as a side curtain type airbag even after a long period of time. .

In a preferred embodiment of the present invention, the internal pressure of the airbag can be measured using the apparatus as shown in FIG. After filling the primary high-compression tank with nitrogen at high pressure in the measuring device, the computer opens the first solenoid valve and adjusts the secondary tank to fill nitrogen gas up to 25 bar. When the secondary tank is filled in this way, the first solenoid valve is closed, and the second solenoid valve is opened by the computer, and the compressed nitrogen gas charged to the secondary tank at 25 bar is momentarily maintained at atmospheric pressure. Exit and deploy the airbag. At this time, the initial maximum pressure inside the airbag is measured by the pressure sensor, and the measurement results are transmitted to the computer. After a few seconds, the pressure is measured again and recorded by the computer.

Therefore, the double fabric of the present invention meets the above conditions and is injected at an instantaneous pressure of 25 bar, the initial maximum pressure is 40 KPa or more, the internal pressure after 6 seconds is 25 KPa or more, and the bark strength of the joint is 1000 N or more. Elongation at break may be less than 50%.

The present invention can also provide a vehicle airbag manufactured by including the partary double fabric by the gas. Preferably, the airbag is a curtain airbag.

The airbag is coated with a resin coating layer on one surface of the two-component double fabric by the gas, and drying it; And it may be prepared by a manufacturing method comprising the step of coating a resin coating layer on the other side of the part double fabric by the gas and drying it.

The double fabric having the gaseous component of the present invention described above can be suppressed to the maximum air leakage when inflated can be usefully used for vehicle airbags, life jackets, shock absorbers and the like. In addition, the double fabric of the present invention is not required to sew to simplify the manufacturing process of the final product can be made cheap manufacturing cost.

In the present invention, matters other than those described above can be added or subtracted as required, and therefore, the present invention is not particularly limited thereto.

In the gaseous part double fabric of the present invention, two fabric layers separated from each other at the junction forming the boundary between the inflated portion and the non-expanded portion form a mirror image around the intersection, and the non-expanded portion is also composed of step stitch fabric. By doing so, when the airbag is deployed by the gas, it is possible to effectively block the gas exiting to the joining portion, thereby improving the pressure-resisting performance of the double fabric and ensuring excellent weaving and smoothness.

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the scope of the present invention is not limited to the following examples.

In the present invention, the properties of the double fabric and the airbag were evaluated by the following method.

a) Determination of air bag internal pressure of double fabric:

As shown in FIG. 6, the change in the internal pressure of the airbag was observed over time after the airbag was deployed by instant injection of 25 bar of nitrogen compressed gas into the air. Since this operation is preferably controlled electronically to minimize the error, the electronic control device is used for the injection and blocking of the air.

b) Cover factor measurement:

It measured as Formula 1 below.

[Equation 1]

Cover Factor (CF)

c) lecture:

It measured by ASTM D 4032 circular band method.

d) Thickness of the fabric surface of one fabric layer: measured by ASTM D 1777 method.

e) Bark strength: measured by ASTM D 5822 method.

f) Elongation at break: measured by ASTM D 5822 method.

Example  One

Double fabrics were prepared in a jacquard loom using 420 denier polyamide multifilaments as warp and weft yarns. The two layered portions separated from the double fabric use tissue as shown in FIG. 1, and the joining portion constitutes a tissue formed by repeating six times the mirror-like tissue as shown in FIG. 4, and the non-expansion portion is shown in FIG. 5. In the same manner as the double weave fabricated to be composed of a step weaving step and cross stitching the 2X2 basket tissue step by step.

At this time, the inclination density was 57 bones / inch, the weft density was 49 bones / inch, and the cover factor was 3,176. Subsequently, both sides of the woven double fabric are treated with silicone resin 95 g / m ² in a conventional manner so that the air flows out through the joint point, or tissue point, that forms a separate two layer. It was. This was cut to measure the thickness, stiffness, and bark strength of one fabric layer by the above method. The measured stiffness was 1.18 kgf, the thickness of one fabric layer was 0.39 mm and the bar strength was 1680 N. In addition, as a result of measuring the airbag internal pressure by the above method, the initial maximum internal pressure at the injection of 25 bar instantaneous pressure was 64 KPa, and the measured internal pressure after 6 seconds was 47 KPa.

Example  2

A double fabric was woven in the same manner as in Example 1, except that 315 denier polyamide multifilament was used.

At this time, the inclination density and the weft density were 60 books / inch and the cover factor was 2,129, respectively. Subsequently, both sides of the woven double fabric are treated with silicone resin 95 g / m ² in a conventional manner so that the air flows out through the joint point, or tissue point, that forms a separate two layer. It was. This was cut to measure the thickness, stiffness, and bark strength of one fabric layer by the above method. The measured stiffness was 0.6 kgf, the thickness of one fabric layer was 0.33 mm and the bar strength was 1200 N. In addition, as a result of measuring the airbag internal pressure by the above method, the initial maximum internal pressure at the injection of 25 bar instantaneous pressure was 60 KPa, and the measured internal pressure after 6 seconds was 32 KPa.

Example  3

In the same manner as in Example 1, except that the non-expanded portion of the double-woven fabric so that it consists of a step-weaving weaving stepwise cross-bonding the double weave and 1X1 basket structure in the same manner as in FIG.

The thickness, the stiffness, and the bark strength of one fabric layer were measured by the above method. The measured compressive strength was 1.18 kgf, the thickness of one fabric layer was 0.39 mm, and the bark strength was 1680 N. In addition, the air bag internal pressure was measured by the above method. As a result, the initial maximum internal pressure at the time of 25 bar instantaneous pressure injection was 67 KPa, and the measured internal pressure after 6 seconds was 48 KPa.

Example  4

Performing the same method as in Example 1, but the step of cross-joining the double weave and the 3X3 basket structure in a manner as shown in Figure 5 the tissue of the left non-expansion layer separation portion (A) based on the junction (C) The double fabric was woven to have a woven fabric.

The thickness, the stiffness, and the bark strength of one fabric layer were measured by the above method. The measured stiffness was 1.18 kgf, the thickness of one fabric layer was 0.39 mm and the bar strength was 1680 N. In addition, the airbag internal pressure was measured by the above method, and the initial maximum internal pressure at the time of 25 bar instantaneous pressure injection was 66 KPa, and the measured internal pressure after 6 seconds was 46 KPa.

Example  5

The same method as in Example 1 was carried out, but the double fabric was woven with a coating amount of silicone resin of 75 g / m 2.

The thickness, the stiffness, and the bark strength of one fabric layer were measured by the above method. The measured compressive strength was 1.13 kgf, the thickness of one fabric layer was 0.37 mm, and the bark strength was 1520 N. In addition, the airbag internal pressure was measured by the above method. As a result, the initial maximum internal pressure at 62 bar instantaneous pressure injection was 62 KPa, and the measured internal pressure after 6 seconds was 36 KPa.

Example  6

The same procedure as in Example 2 was carried out, but the double fabric was woven with a coating amount of silicone resin of 75 g / m 2.

The thickness, the stiffness, and the bark strength of one fabric layer were measured by the above method. The measured stiffness was 0.58 kgf, the thickness of one fabric layer was 0.31 mm and the bar strength was 1120 N. In addition, as a result of measuring the airbag internal pressure by the above method, the initial maximum internal pressure at the time of 25 bar instantaneous pressure injection was 54 KPa, and the measured internal pressure after 6 seconds was 26 KPa.

Comparative example  One

The same method as in Example 1 was performed, but the double fabric was woven by using only 1 × 1 basket tissue without using the step-bonding fabric in the non-expansion portion, but the weaving tension was too high to make weaving (50% of weaving efficiency). Below).

Comparative example  2

The same method as in Example 1 was carried out, but the double fabric was woven in such a manner that only the double fabric such as the expanded portion was formed without using the step-bonding fabric in the non-expanded portion.

The thickness, the stiffness, and the bark strength of one fabric layer were measured by the above method. The measured stiffness was 1.18 kgf, the thickness of one fabric layer was 0.39 mm and the bar strength was 1680 N. In addition, as a result of measuring the airbag internal pressure by the above method, the initial maximum internal pressure at the time of 25 bar instantaneous pressure injection was 60 KPa, and the measured internal pressure after 6 seconds was 23 KPa. In this case, after 6 seconds, the internal pressure of the airbag was remarkably decreased, and in this case, a problem of deteriorating the passenger protection function may be generated when used as a vehicle airbag.

The double fabric of the present invention is composed of two fabric layers separated from each other and joined while forming a mirror image around the intersection, and the non-expanded tissue is composed of a step bonded fabric in which the air bag is deployed by the gas when the air bag is deployed by the gas. It is possible to provide a double fabric and an airbag having excellent performance by improving physical properties such as pressure-resisting performance of the double fabric by blocking the gas flowing out to the joint portion.

1 is a complete organization (a) and expanded pattern (b) of a double weave having two separate flat weave consisting of a double weave according to an embodiment of the present invention.

Figure 2 is a cross-sectional view showing a contact point (C) generated while the mirror image of the plain weave in accordance with an embodiment of the present invention.

3 is a cross-sectional view of the double-component fabric doubled by the air inflated by the air according to an embodiment of the present invention.

Figure 4 is a complete organizational view of the flat plain surface (a) and the mirror image (b) corresponding to the left and right layer separation portions (A, B) around the junction (C) in accordance with an embodiment of the present invention.

Figure 5 is a complete organizational chart (a) and expanded pattern (b) of the step weaving step cross weave the double weave and 2X2 basket weave according to an embodiment of the present invention.

Figure 6 is a schematic diagram showing an apparatus for measuring the internal pressure of the airbag according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

A: left lamella tissue B: right lamella tissue

C: connection point

Claims (12)

Expansion part which has a part property by gas, A non-expansion portion supporting the inflation portion, and It includes a joining portion forming a boundary between the inflation portion and the non-expansion portion, The inflation portion is composed of a double fabric comprising two fabric layers separated from each other, the fastening portion includes a mirror-like tissue in which the two fabric layers separated from each other are joined while forming a mirror image around the intersection point, the non-expansion Wealth organization includes phased-in jobs that are cross-stitched step by step, When the gas is injected at 25 bar instantaneous pressure, the initial maximum pressure is 40 KPa or more, the internal pressure after 6 seconds is 25 KPa or more, the sealing strength of the joint is 1000 N or more, and the elongation is less than 60%. . The method of claim 1, The joining part is a double-component fabric by a gas comprising a tissue formed by repeating the mirror image twice or more times. The method of claim 1, The step stitching fabric is a double fabric layer comprising two fabric layers separated from each other, Partial duplex fabric by means of the stepwise cross-junction of the tissue selected from the group consisting of 1X1 tissue, 2X2 tissue, 3X3 tissue, runners, double woven fabrics, and one or more mixed woven fabrics thereof. . The method of claim 1, Partial duplex fabric by means of a gas having a stiffness of less than 3.5 kgf of one fabric layer constituting the double fabric. The method of claim 1, Partial double fabric by means of a gas having a thickness of 0.5 mm or less of one fabric layer constituting the double fabric. The method of claim 1, Partial double fabric of the gas of the cover factor value of one fabric layer constituting the double fabric is 1900 or more by the following formula (1). [Equation 1] Cover Factor (CF)

delete The method of claim 1, The double fabric is a partary double fabric of the gas comprising a resin coating layer coated on the surface. 9. The method of claim 8, The resin coating layer is a component double fabric of a gas containing a silicone resin, urethane resin, or a mixture thereof. 9. The method of claim 8, Partial duplex fabric with a gas having a coating amount of 30 g / ㎡ to 150 g / ㎡ on one side of the double fabric. A vehicle airbag manufactured comprising the partary double fabric of the gas according to any one of claims 1 to 6 or 8 to 10. 12. The method of claim 11, The airbag is a vehicle airbag is a curtain type airbag.

Images