KR101200902B1 - 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 tissue of the non-expansion portion relates to a gaseous double fabric and a gas bag comprising the same, including a step weaving step by step cross weaving.

The present invention can improve the pressure-resisting performance of the double-woven fabric by blocking the gas exiting to the joint portion when the air bag is deployed by the gas by configuring the step joint fabric to cross-engage the non-expanded tissue in stages. .

Double fabric, non-expansion, step fastening, 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, even when using the texture of the junction portion of the double fabric as a 3X3 basket weave or 2X2 basket weave, the two layers separated by the gas are in contact with the expansion according to the structure of the non-expansion portion forming the interface. There is a problem in that the outflow of gas occurs in the connection and thus the air breathability is increased, there is a need for research to improve this.

The present invention is to provide a double-woven fabric and an air bag comprising the same, so that the non-expanded tissue of the double-woven fabric is composed of a step-bonding fabric that is cross-stitched step by step to improve the excellent pressure-resistance characteristics, excellent durability and stability.

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 tissue of the non-expansion portion provides a partary double fabric with a gas comprising a step weaving stepwise cross-stitched.

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.

The present inventors comprise a step-by-step weaving stepwise cross-joining the non-expanded part tissue of the double fabric, so that the gas escapes stepwise even in the non-expanded part when the double fabric is expanded by air so that The present invention was completed by finding out that it is possible to prevent leakage, maximize the physical properties such as pressure-resistance performance, and provide a double-woven fabric and airbags with superior 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) with two separate plain weave planes composed of double weaves and an expanded pattern (b) thereof. 2 is a cross-sectional view of a tissue forming the double fabric of the present invention.

As shown in Fig. 2, the double fabric is basically 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. . The double fabric is a jacquard weaving machine for weaving two plain weaving layers (A and B in FIGS. 2 and 3) separated from each other on a weaving machine at the same time, and joining the two fabric layers (FIG. 2 and 3) C) includes a 2X2 or 3X3 basket weave (a in FIG. 4), a runner weave (b in FIG. 4), a partial woven weave of plain weave double weave (c in FIG. 4), or one or more of these blended weaves. Weaving

First of all, the fabric layer of the present invention is primarily intended 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 withstands the pressure of the expanding gas. Do it.

As described above, a fabric including a tissue that is joined to a tissue separated into a top layer and a bottom layer may be divided into a layered tissue (A and B in FIGS. 2 and 3) and a stitched tissue (C in FIGS. 2 and 3). Also, depending on the arrangement of the pattern, the area closed by the layered tissue (B of FIG. 3), that is, the swollen area, the connective tissue (C of FIGS. 2 and 3), and the outside of the closed area by the connective tissue The structure has a structure of dividing the space into three regions that are irrelevant to component parts such as tissue (A of FIG. 3). In general, the left delamination portion (A) tissue located on the left side and the right delamination portion (B) tissue located on the right side of the junction point in Figure 2 is shown in Figure 1, in the present invention It is used as step bonding to the left delamination part (A) rather than the area. In addition, the left and right delamination portions are separated by the junction (C) tissue.

The double fabric of the present invention includes an expanded portion (B) having a component property by gas, an unexpanded portion (A) for supporting the expanded portion, and a joining portion (C) forming a boundary between the expanded portion and the non-expanded portion. As such, the inflation portion can be woven into a double woven fabric in a conventional manner. Preferably, the expandable part with the gas comprises two separate layers of fabric which are woven simultaneously using a loom.

In addition, in the present invention, the joining portion joins the expanded portion having a part property by the gas formed of a double weave and forms a boundary with the non-expanded portion. Preferably, the stitching portion partially stitches around the two fabric layers separated from each other in a single woven fabric so that the expandable part having a part is sealed by the gas. In particular, by forming the stitching portion of at least 13 or more yarns, it is more preferable that the stitching portion is formed more firmly during air expansion and effectively suppresses the external discharge of air to prevent the air from escaping from the inside of the bag.

In the present invention, the connection portion is the two separate fabric layers of the delamination part, the inclination of the top layer forms the weft and tissue points of the bottom layer, or the weft of a considerable layer of the weft and tissue points of the bottom layer Tissue points that are formed, or the slope of the bottom layer forms the weft and tissue points of the top layer, or the tissue points formed so that two fabric layers form one layer in the tissue part by the weft of the bottom layer forming the slope and tissue points of the top layer , Tissue line, or tissue surface. 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 that allows the warp and weft to cross each other up and down to form a fabric.

In the double fabric of the present invention, the non-expansion portion includes the remaining portion except for the expansion portion having a component part by the gas and the connection portion that engages it, and serves to support the expansion portion. In the two-part double fabric by the gas of the present invention, the non-expandable part is constituted by a step weaving step by step to cross-join the reinforcing part so as to reinforce the sealing property of the expansion part having the part property by the gas. In addition, the non-expansion unit can be made by step stitching 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 any 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.

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 result is 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.

The partary double fabric by the gas of the present invention includes a step stitched fabric in the non-expanded portion tissue, thereby improving the pressure-resisting performance of the double fabric by blocking the gas exiting the joint portion when the airbag is deployed by the gas. And the double fabrics and airbags of the present invention exhibit excellent pressure resistance retention characteristics.

Hereinafter, preferred examples are provided to help understanding of the present invention, but the following examples are merely to illustrate the present invention, and 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. As shown in FIG. 2, the tissue of the left non-expansion layer separation portion A based on the junction C is composed of a step junction where the double weave and the 2 × 2 basket tissue are cross-linked stepwise in the same manner as in FIG. 5. The structure of the right delamination portion (B) based on the connection point (C) is composed of a double weave as shown in Figure 1, the connection part consisting of a partial woven weave of 2X2 basket tissue and a plain weave double weave of 20 yarns Separated by) to produce a double fabric.

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 lecture intensity was 1.18 kgf, the thickness of one fabric layer was 0.39 mm, and the bark strength was 1731 N. In addition, the air bag internal pressure was measured by the above method. As a result, the initial maximum internal pressure was 68 KPa at 25 bar instantaneous pressure injection, and the measured internal pressure after 6 seconds was 34 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 compressive strength was 0.6 kgf, the thickness of one fabric layer was 0.33 mm, and the bark strength was 1259 N. In addition, as a result of measuring the air bag 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 34 KPa.

Example  3

In the same manner as in Example 1, except that the tissue of the left non-expansion layer separation portion (A) based on the contact point (C) stepwise cross-bonding the double weave and the 1X1 basket tissue in a manner as shown in FIG. Weaving double fabrics were made so that the conjuncts were composed of stepwise weaving.

The thickness, the stiffness, and the bark strength of one fabric layer were measured by the above method. The measured lecture intensity was 1.18 kgf, the thickness of one fabric layer was 0.39 mm, and the bark strength was 1731 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 66 KPa, and the measured internal pressure after 6 seconds was 45 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 lecture intensity was 1.18 kgf, the thickness of one fabric layer was 0.39 mm, and the bark strength was 1731 N. In addition, the air bag internal pressure was measured by the above method. As a result, the initial maximum internal pressure was 69 KPa at 25 bar instantaneous pressure injection, and the measured internal pressure after 6 seconds was 44 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, 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 63 KPa, and the measured internal pressure after 6 seconds was 38 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 bark strength was 1235 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 28 KPa.

Comparative example  One

The same method as in Example 1, except that the tissue of the left non-expansion layer separation portion (A) based on the contact point (C) is composed of only 1X1 basket tissue without using the step weaving fabric to double fabric Weaving was possible, but weaving was impossible because weaving tension was too high (weaving efficiency below 50%).

Comparative example  2

The same method as in Example 1, except that the tissue of the left non-expansion layer separation portion (A) based on the contact point (C) is composed of a double weave, such as the inflated part without using the step fastening double Weaving the fabric.

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 54 KPa, and the measured internal pressure after 6 seconds was 22 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.

According to the present invention, by constructing a step joint weaving the non-expanded part of the tissue step by step, it is possible to improve the physical properties such as pressure-resisting performance of the double fabric by blocking the gas exiting to the joint part when the air bag is deployed by the gas. It is possible to provide double fabrics and air bags with good performance.

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 of a tissue forming a double fabric according to an embodiment of the present invention.

Figure 3 is a cross-sectional state inflated part air double fabric by the air according to an embodiment of the present invention by air.

Figure 4 is a cross-sectional view of the 2X2 basket weaves constituting the junction of the separate double weave according to an embodiment of the present invention and its organization (a), the cross section of the partial weaving of plain weave double weave and its organization (b), and runners (C) the cross-section of and its organization.

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 tissue of the non-expansion portion includes a step weaving step by step cross stitching, 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 50% or less. . 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, The tissue of the stitching part is a gaseous duplex fabric comprising a 2X2 tissue, a 3X3 tissue, a main thread, a partial stitching fabric of a double fabric, or at least one blended fabric thereof, joined by 13 or more yarns. 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. The method of claim 7, wherein 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.

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