KR20140087848A - Fabric for airbag including laminated layers - Google Patents

Abstract

The present invention relates to a laminating fabric for an air bag, having a multilayer structure of laminating layers consisting of a first laminating layer including an adhesive polymer film having a melting point of 50-150°C formed on a surface of the fabric and a second laminating layer including a gas barrier polymer film having a melting point of 100°C or higher; and to a method for preparing the same. According to the present invention, a predetermined thermoplastic polymer film is attached on the surface of the fabric in a multilayer laminating manner, thereby ensuring high internal pressure retaining capacity and high tensile strength, tear strength, and slippage resistance, which are required for a side curtain air bag cushion or the like, and providing excellent receipt capacity, shape stability, and air barrier effect, so that the present invention can safely protect passengers even in a vehicle crash or rollover.

Description

{FABRIC FOR AIRBAG INCLUDING LAMINATED LAYERS}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminating fabric for automobile airbags, and more particularly, to a laminating fabric for automobile airbags having excellent mechanical properties and pressure-holding performance in the production of airbag cushions by laminating a specific polymer resin film on the surface of a fabric.

Generally, an air bag detects a collision impact applied to a vehicle at the time of a frontal collision at a speed of about 40 km / h or more at a speed of about 40 km / h by the impact sensor, And inflates the inflator to supply air to the inflator, thereby protecting the driver and the passenger. The structure of a typical air bag system is the same as that shown in Fig.

1, a general airbag system includes an inflator 121 that generates gas by ignition of a priming tube 122, and an airbag 124 that inflates and deploys toward the driver of the driver's seat by the generated gas An airbag module 100 mounted on the steering wheel 101, an impact sensor 130 for generating an impact signal in the event of an impact, and an electronic control module (not shown) for igniting the primer 122 of the inflator 121 And an electronic control module 110. When the vehicle collides head-on, the airbag system configured as described above senses an impact in the impact sensor 130 and transmits a signal to the electronic control module 110. At this time, the electronic control module 110 recognizing this ignites the primer 122 to burn the gas generating agent in the inflator 121. The gas generating agent thus combusted expands the air bag 124 through rapid gas generation. The inflated and deployed airbag 124 partially absorbs the impact load due to the collision while contacting the front surface of the driver and collides with the inflated airbag 124 as the driver's head and chest move forward due to inertia The gas of the airbag 124 is rapidly discharged to the exhaust hole formed in the airbag 124, so that the front surface of the driver is buffered. Therefore, by effectively buffering the impact force transmitted to the driver in the frontal collision, it is possible to alleviate the secondary injury.

In particular, curtain airbags among airbags used in automobiles can protect passengers from secondary collisions or vehicle overturns by maintaining an internal pressure for a certain period of time with an airbag protecting passengers in case of rollover or side collision. Currently, curtain airbags are manufactured using a silicone coating type or a thermoplastic polyurethane coating type in order to allow the inflators to exhibit excellent expansion performance in the airbag deployment due to rapid gas generation. Particularly, in the case of a side curtain airbag used in a roll over application, two types of airbags are currently being manufactured in order to maintain excellent pressure-resistance maintenance performance along with the performance of the airbag deployment. One type is coated on the surface of OPW (One Piece Woven), and the other type is coated with a thermoplastic polyurethane coating on the surface of OPW.

However, in the case of a product coated with a silicone coating agent, the cushion has a poor folding property due to a high coating weight and has disadvantages such as a high manufacturing cost. In the case of a product coated with a thermoplastic polyurethane, The coating weight is not high, but the folding property of the final cushion is deteriorated due to the high permeability of the coating agent into the inside of the fabric, and the coating agent is peeled when the airbag cushion is deployed under high temperature / There is a disadvantage that a delamination phenomenon occurs. Further, as the emission mitigation test (Ejection mitigation) for evaluating the safety of the curtain airbag that protects the safety of the occupant in the event of the rollover of the vehicle due to the strengthening of the North American automobile regulations has been strengthened recently, the excellent internal pressure maintenance performance of the cushion is demanded.

Therefore, instead of manufacturing the airbag which is manufactured by coating the silicone coating agent or thermoplastic polyurethane agent, it is possible to secure the excellent expansion performance and internal pressure maintaining performance while minimizing the damage to the fabric in the airbag deployment and also improve the folding performance of the cushion The research on the development of fabric for airbags is needed.

The present invention aims to provide a laminating fabric for airbags that minimizes the damage of the fabric to strong pressure and temperature during deployment of the airbag, maintains excellent inflation performance and internal pressure for a certain period of time.

The present invention also provides a method for manufacturing a laminating fabric for an airbag.

The present invention relates to an airbag for airbags comprising a first laminating layer comprising an adhesive polymer film having a melting point of 50-150 DEG C on the surface of a fabric and a second laminating layer comprising a gas-impermeable polymer film having a melting point of 100 DEG C or higher, Provides laminating fabric.

The present invention also relates to a method of making a fabric, comprising: weaving a fabric; Refining said woven fabric; Opening and polishing the refined fabric; And a second lamination layer comprising a first lamination layer comprising an adhesive polymer film having a melting point of from 50 to 150 DEG C and a second lamination layer comprising a gas-impermeable polymer film having a melting point of at least 100 DEG C, sequentially on the surface of said heat- A method of manufacturing a laminating fabric for an airbag comprising the steps of:

Hereinafter, a laminating fabric for an air bag according to a specific embodiment of the present invention, a manufacturing method thereof, and a vehicle air bag manufactured using the same will be described in detail. It will be apparent to those skilled in the art, however, that this is not intended to limit the scope of the invention, which is set forth as an example of the invention, and that various modifications may be made to the embodiments within the scope of the invention.

In addition, throughout this specification, "comprising" or "containing ", unless specifically stated, refers to including any and all components (or components) Can not be interpreted as excluding.

The present invention relates to a method for producing an airbag for a vehicle, which comprises bonding a multilayer thermoplastic polymer film to a fabric surface by a laminating method to produce an airbag deployment performance and a pressure resistance maintenance performance even under severe conditions of high temperature and high pressure It is possible to improve gas leakage prevention and airtightness, and at the same time ensure excellent form stability.

According to an embodiment of the invention, a fabric for an air bag is provided in which a particular thermoplastic polymer film is laminated to a multilayer. Wherein the fabric for the airbag is formed by sequentially forming a first laminating layer comprising an adhesive polymer film having a melting point of 50-150 DEG C on a surface of a fabric and a second laminating layer comprising a gas-impermeable polymer film having a melting point of 100 DEG C or higher will be.

The laminating fabric for an airbag of the present invention can sufficiently compensate for the disadvantages of the conventional silicone coating method by press bonding the previously prepared polymeric adhesive film to the surface of the raw fabric. Particularly, in terms of the functional aspect, since the polymer film in solid phase rather than the liquid phase forms a coating on the surface of the fabric, it is very advantageous in air permeability because it is very easy to cover the fabric in the silicone coating. In addition, since the silicone rubber has a sufficient performance as a raw material for an airbag even at a low weight relative to the weight of a conventional silicon coating, there is an additional advantage that weight reduction of parts can be achieved.

In the present invention, the fabric for an airbag refers to a fabric or a nonwoven fabric used for manufacturing an airbag for an automobile. Any fabric that can be used in general can be used and is not limited to the type. For example, the airbag fabric is made of at least one fiber selected from the group consisting of nylon-based fibers, polyester-based fibers, polyolefin-based fibers, and aramid-based fibers. In view of superior airbag deployment performance and cost, Based fibers and polyester-based fibers.

The fiber may have a fineness of 210 to 840 denier, preferably 300 to 600 denier. The fineness is preferably 210 denier or more in terms of strength, and the yarn thickness is preferably 840 denier or less in terms of retention. Do. The denier is a unit indicating the thickness of a yarn or a fiber and is 1 denier when the length is 9,000 m is 1 g.

In the fabric for an airbag according to the present invention, the fabric may be a plain fabric having a 1/1 plain texture, a woven pattern. Also, in the fabric for an airbag according to the present invention, the fabric may comprise a double-woven pattern structure which is woven simultaneously and forms top and bottom surfaces separated from each other. Particularly, in the case of an OPW (One Piece Woven) fabric having a double-woven pattern structure as the fabric, the fabric has an expanding portion having a component property by the gas, a non-expanding portion for supporting the expanding portion, Wherein the expanding portion is composed of a double fabric including upper and lower fabric layers which are woven simultaneously and separated from each other, the expanding portion having a double-layer pattern structure in which the upper and lower fabric layers, May include.

Herein, the term "double-faced pattern structure" refers to a structure in which upper and lower fabric layers that are woven simultaneously and separated from each other are woven into the same tissue at positions corresponding to each other, And the like. At this time, the whole or part of each fabric layer structure may be varied at positions where the upper and lower fabric layers correspond to each other. In particular, the organization of the upper and lower fabric layers in the double-woven fabric may be divided into three groups: a tissue of 1/1, a tissue of 2/2, a tissue of 3/3 (basket tissue), a twill tissue, Woven ribbons, or blends thereof.

The laminating fabric for an airbag according to the present invention comprises a first laminating layer on the surface of the fabric, the first laminating layer comprising an adhesive polymer film which is chemically or mechanically bonded to the surface of the fabric, A second lamination layer comprising a gas-impermeable polymer film that effectively blocks inflation gas is formed. In the airbag fabric of the present invention, the lamination layer is composed of two or more multi-layered structures.

Particularly, the laminating fabric for an airbag according to the present invention is characterized in that a surface of the fabric is in contact with one surface of one side of the first laminating layer and the other surface of the first laminating layer is in contact with the second laminating layer .

The airbag fabric of the present invention has a laminated layer in which a thermoplastic film such as an adhesive polymer film and a gas-impermeable polymer film are laminated, has excellent expansion performance in the airbag deployment and air permeation to the surface of the fabric (OPW) And effectively improves the foldability of the final airbag cushion. The airbag cushion including the laminating layer exhibits excellent inner pressure holding performance during actual cushioning and excellent folding performance of the airbag cushion compared to an airbag cushion including a conventional silicone and a polyurethane coating layer. A laminated layer on which these thermoplastic films are laminated can be formed on both sides of the fabric surface. In the airbag fabric of the present invention, such a thermoplastic film is applied to the surface of a fabric by a laminating method. The thermoplastic film is excellent in internal pressure maintaining performance in spite of a low application amount and excellent in long-term aging of high temperature and high humidity And has a property holding performance.

In particular, in the laminating fabric for an airbag according to the present invention, the thermoplastic polymer film is composed of an adhesive film directly bonded to the surface of the fabric, and a protective film adhered to the adhesive film and having an effect of blocking the inflator gas .

The adhesive polymer film may be a hot melt film having a melting point of 50 to 150 캜, preferably 90 to 130 캜. The melting point of the adhesive polymer film may be 50 占 폚 or higher in terms of improving the adhesion stability and the uniform adhesion between the adherend material (the protective film of the fabric and the second lamination layer), and the excellent adhesion stability The temperature can be 150 DEG C or less. In particular, when a hot-melt polymer film having a melting point exceeding 150 ° C and having a high grade is applied, sufficient melt-bonding can not be realized without increasing the process temperature, so that the adhesive layer may not be properly formed, The second laminating layer protective film laminated on the upper layer may be thermally damaged.

The gas-impermeable polymer film, which is a protective film having a function of blocking the inflator gas by being adhered to the adhesive film, may have a melting point of 100 ° C or more or 100 to 200 ° C, preferably 140 ° C or more. The melting point of the gas barrier polymer film may be 100 deg. C or more in terms of securing stable adhesion with the adhesive polymer film. Particularly, the gas-barrier polymer film has a thermoplastic elastomer (TPE) having a higher temperature of 50 ° C or more based on the melting point (50 to 150 ° C) of the adhesive polymer film so as to improve gas barrier property, adhesion and durability, Film or the like.

In the case of the adhesive film constituting the first laminating method of the present invention, the adhesive film may be a polyolefin-based polymer, a polyester-based polymer, a copolyester-based polymer, a thermoplastic polyurethane- Based polymer, a polyamide-based polymer, a copolyamide-based polymer, an ethylene-vinyl acetate (EVA) polymer, and a polyacrylate-based polymer. The adhesive film may include a polyolefin polymer, a thermoplastic polyurethane (TPU) polymer, a polyamide polymer, a copolyamide polymer, or the like in terms of adhesion and elasticity with the surface of the OPW .

Further, in the case of the gas barrier film constituting the second laminating layer for blocking the inflator gas by adhering to the adhesive film, a polyamide-based polymer and a copolyamide-based polymer, a thermoplastic polyurethane Based polymer, and an ethylene copolymer-based polymer. From the viewpoint of the adhesiveness with the adhesive film and the gas barrier effect, the polyamide-based polymer , A copolyamide-based polymer, and a thermoplastic polyurethane-based polymer.

In the present invention, a laminating layer including a thermoplastic film (an adhesive film and a protective film) such as the adhesive polymer film and the gas barrier polymer film, for example, the first laminating layer and the second laminating layer, 200 mu m, preferably 60 to 150 mu m, and more preferably 65 to 100 mu m. The total film thickness of the laminating layer may be not less than 50 占 퐉 in view of securing the physical properties of the airbag fabric to exhibit excellent developing performance in the event of a car accident. In view of the folding performance of the airbag cushion and economical efficiency, .

Here, the first laminating layer comprising the adhesive polymer film may be laminated so that the film thickness is 30 to 100 mu m, preferably 40 to 80 mu m, more preferably 45 to 60 mu m. The first laminating layer can maintain the above-mentioned range in terms of strong adhesion with the surface of the airbag fabric and excellent physical properties in developing the airbag and securing the folding property of the airbag cushion. In addition, the second lamination layer comprising the gas-barrier polymer film may be laminated so that the film thickness is 20 to 100 mu m, preferably 20 to 70 mu m, more preferably 20 to 40 mu m. The second laminating layer exhibits strong adhesion with the first laminating layer laminated on the surface of the fabric, and may have a thickness of 20 탆 or more for proper blocking of the inflator gas during deployment of the airbag cushion. The airbag cushion folding It can be 100 占 퐉 or less in view of improving the adhesion and the like.

On the other hand, in the airbag fabric of the present invention, the adhesive polymer film of the first laminating layer has a tensile strength of 27 MPa or more and a tensile elongation of 200% or more as measured by the International Organization for Standardization ISO 527-3 method have. The gas-impermeable polymer film of the second laminating layer may have a tensile strength of 27 MPa or more and a tensile elongation of 200% or more as measured by the International Organization for Standardization ISO 527-3 method.

In the present invention, the laminating layer may be pre-treated to improve adhesion between the fabric surface and the thermoplastic polymer adhesive film, and a pre-treatment method may be applied to the pretreatment method. Typical methods include a binder layer treatment method including a thermo-cross-linkable material such as polyurethane, a corona treatment method, a plasma treatment method, a flame techniques treatment method, a hydrogen fluoride ) Gas injection treatment method can be used. However, a polyurethane-based polymer binder treatment method is suitable for excellent adhesion performance and durability with an adhesive film.

The laminating fabric for an airbag of the present invention may further comprise a binder layer comprising a thermally crosslinkable material between the fabric surface and the first laminating layer. The thermally crosslinkable material may be at least one selected from the group consisting of a polyurethane polymer, an acrylic polymer, and a vinyl acetate polymer.

Also, the airbag fabric may have a bonding strength between the fabric surface and the polymer material for the laminating layer, between the fabric surface and the first laminating layer, through known corona pre-treatment, plasma pre-treatment, flame pretreatment, or HF gas injection pre- . When preprocessing is performed on the surface of the fabric for airbags, the grooves or bends are formed on the fabric surface to increase the cross-sectional area of the material surface, thereby improving the adhesion of the polymer material. Further, The adhesion can be increased, and the adhesion with the polymer material can be increased by forming the crosslinking on the surface of the fabric.

In the present invention, a laminating layer comprising a thermoplastic film (such as an adhesive film and a protective film), such as the adhesive polymer film and the gas barrier polymer film, such as the first and second laminating layers, M ² , preferably 20 g / m ² to 40 g / m ² , and more preferably 25 g / m ² to 35 g / m ² . In the folding properties and price side of the laminated fabric per unit area of the laminated amount of the layer is to secure a uniform thickness of the multilayer film and bag to secure the physical properties of the fabric side of 15 g / m can be ^two or more, the air bag cushion in a 45 g / m ² ≪ / RTI >

Wherein the first laminating layer comprising the adhesive polymer film has a basis weight of 7 to 22 g / m ² , preferably 10 to 20 g / m ² , more preferably 12 to 17 g / m ² per unit fabric area Respectively. The lamination amount per unit surface area of the first laminating layer may be not less than 7 g / m ^{2 in} order to exhibit strong adhesion with the surface of the fabric of the airbag and physical properties of the fabric. In view of the folding property and cost of the airbag cushion, / m < ² >.

Also, the second laminate layer comprising the gas barrier polymer film has a basis weight of 8 to 23 g / m ² , preferably 10 to 20 g / m ² , more preferably 13 to 18 g / m ² per unit fabric area Respectively. The lamination amount of the second laminating layer per unit area of the fabric may be not less than 8 g / m < ² > in order to exhibit strong adhesion with the first laminating layer and appropriate barrier property of the inflator gas during deployment of the back cushion. in the folding properties and price side may be ² g / m 2 or less.

The laminating fabric for an airbag according to the present invention can be obtained by laminating a specific thermoplastic polymer film as described above to the surface of a fabric so that the inner pressure holding performance measured according to the method of International Standardization Organization ISO 9237 is lower than that of a conventional silicone coating or polyurethane coating The internal pressure maintenance performance of the airbag cushion was about two times higher than that of the airbag cushion, and the folding performance of the airbag cushion was improved by about 20%.

The laminating fabric for the airbag has a scrubbing property of the fabric measured by the International Standardization Organization ISO 5981 method of 200 strokes or more or 200 to 2,000 strokes, preferably 600 strokes or more, more preferably 850 strokes or more . By improving the scrub properties of the airbag fabric, it is possible to prevent a delamination phenomenon in which the laminating layer is peeled from the surface of the raw fabric due to high-temperature / high-pressure gas during deployment of the airbag cushion.

The laminating fabric for airbags may have a tensile strength property of 2,500 N / 5 cm or more, or 2,500 to 3,000 N / 5 cm, preferably 3,000 N / 5 cm or more, measured by the method of International Standardization Organization ISO 13937-1 . As a result, the laminating fabric for an airbag of the present invention can achieve sufficient stiffness and durability as an airbag. Also, the laminating fabric for airbags has a toughness of 250 N / mm or 250-300 N / mm, preferably 300 N / mm or more, measured by the method of International Standardization Organization ISO 13937-1 . This can prevent the tear of the fabric due to the high-temperature / high-pressure gas when the airbag cushion is deployed.

In addition, the laminating fabric for an airbag according to the present invention has an adhesive peel strength of 0.8 N / mm or more or 0.8 to 1.5 N / mm, preferably 1.5 N / mm or more as measured by the method of ASTM D 1876 of the American Society for Testing and Materials . As a result, the laminating fabric for airbags can provide excellent adhesive durability and gas-barrier effect.

On the other hand, according to another embodiment of the invention, a method of manufacturing a laminating fabric for an airbag as described above is provided. The laminating fabric for the airbag may be subjected to a step of laminating a specific thermoplastic polymer film to a surface of the fabric in a multilayer structure in combination with weaving, refining, and heat setting processes.

The laminating fabric for an airbag according to the present invention comprises: weaving a fabric; Refining said woven fabric; Opening and polishing the refined fabric; And a second lamination layer comprising a first lamination layer comprising an adhesive polymer film having a melting point of from 50 to 150 DEG C and a second lamination layer comprising a gas-impermeable polymer film having a melting point of at least 100 DEG C, sequentially on the surface of said heat- Step.

Particularly, in the case of a process of applying a conventional silicone coating, a mixing device is required for the liquid control because mixing of the subject and the curing agent must be performed at a specific ratio before the silicon coating, and after the mixing, And the like. However, the manufacturing method of the laminating fabric for an airbag according to the present invention is advantageous in terms of fairness and workability as compared with the above-described silicon coating process since it is a process of simply thermocompressing a previously prepared polymer film.

The laminating fabric for an airbag according to the present invention may further include a step of forming a lamination layer by laminating a thermoplastic polymer adhesive film directly adhered to the surface of the heat-set fabric and a protective film for air- After pre-treatment on the surface of the heat-set fabric, a lamination layer may be formed by laminating a thermoplastic polymer adhesive film and a protective film for air-blocking .

At this time, the fabric weaving step may be woven into a 1/1 plain fabric. Also, the fabric weaving step may be performed by weaving the top and bottom fabric layers that are woven simultaneously with one piece woven (OPW, One Piece Woven).

In the present invention, the laminating fabric for an airbag can be manufactured by weaving a fabric using fibers as a weft and a warp, followed by a refining process and a heat fixing process. Such weaving step, refining step, and heat setting step can be applied to conventionally known process conditions and methods, and are not limited to specific conditions and the like.

However, the method of finally laminating the thermoplastic polymer on the surface of the thermally fixed fabric can be largely applied in three ways. First, a polyurethane-based polymer or a polyolefin-based polymer serving as an adhesive film is melt-extruded and laminated on the surface of the fabric by laminating, and then a polyurethane-based polymer or a polyamide-based protective film is further laminated on the adhesive layer . Secondly, a method of laminating directly on the surface of the fabric using the product formed by combining the adhesive film layer and the protective film layer into one film can be applied. Finally, a pretreatment may be performed on the surface of the fabric to improve the adhesive strength, and then a method of laminating a film (an adhesive film and a protective film) may be applied. In the present invention, any of the above three methods may be adopted as the laminating step.

In the fabricating method for an airbag according to the present invention, the surface of the fabric and one side of the first laminating layer are in contact with each other, and the other side of the first laminating layer is laminated so that the second lamination layer is in contact with the laminating process. Can be performed.

In the method for producing a laminating fabric for an airbag according to the present invention, the adhesive polymer film may be a hot melt film having a melting point of 50 to 150 캜, preferably 90 to 130 캜. The melting point of the adhesive polymer film may be 50 占 폚 or higher in terms of improving the adhesion stability and the uniform adhesion between the adherend material (the protective film of the fabric and the second lamination layer), and the excellent adhesion stability The temperature can be 150 DEG C or less. In particular, when a hot-melt polymer film having a melting point exceeding 150 ° C and having a high grade is applied, sufficient melt-bonding can not be realized without increasing the process temperature, so that the adhesive layer may not be properly formed, The second laminating layer protective film laminated on the upper layer may be thermally damaged.

The gas-impermeable polymer film, which is a protective film having a function of blocking the inflator gas by being adhered to the adhesive film, may have a melting point of 100 ° C or more or 100 to 200 ° C, preferably 140 ° C or more. The melting point of the gas-barrier polymer film may be 100 ° C or more in terms of improving the stable adhesion property with the adhesive polymer film and the durability of the article. Particularly, the gas-barrier polymer film has a thermoplastic elastomer (TPE) having a higher temperature of 50 ° C or more based on the melting point (50 to 150 ° C) of the adhesive polymer film so as to improve gas barrier property, adhesion and durability, Film or the like.

In the meantime, the details of the fiber type and fineness of the fabric, the composition and components of the first and second laminating layers, the types and characteristics of the thermoplastic films, and the like are described above.

In the present invention, the airbag weaving process is a process of arranging warps and wefts at regular intervals to make a cloth, and the weaving pattern of the fabric in the weaving process is not limited to a specific form, but any conventionally usable cloth can be used. However, in general, it is possible to use a double-piece OPW (One Piece Woven) fabric having a component property by using a Jacquard knitting machine.

At this time, in the case of the warp density and warp density of the airbag fabric, the oblique direction density may be 40 to 50 th / inch, more preferably 46 to 49 th / inch. The weft direction density may be 40 to 50 th / inch, more preferably 46 to 49 th / inch. The warp density and weft density of the polyester fabric can be 46 th / inch or more and 46 th / inch or more, respectively in terms of securing excellent mechanical properties of the airbag fabric, And 49 th / inch and 49 th / inch respectively.

In order to ensure airtightness at the fabric for airbags, the elongation is minimized by enduring the tensile force by high-pressure air or the like. At the same time, in order to ensure sufficient mechanical properties in the operation of the airbag, energy absorption performance is maximized at high- very important. Accordingly, the fabric can be made to have a cover factor of 2,000 to 2,500 by the following equation (1), thereby improving airtightness and energy absorption performance at the time of deploying the airbag.

[Equation 1]

When the cover factor of the fabric is less than 2,000, the air may be easily discharged to the outside during the air inflation and the fabric may be broken. If the cover factor of the fabric exceeds 2,500, the air bag cushion The retractability and the foldability can be significantly deteriorated.

In the present invention, the woven fabric can be cleaned by removing the dirt and foreign matter generated during the production of the yarn or during the weaving of the fabric through the refining process. In particular, during the weaving process, agents such as oiling and sizing which are used to increase the property of the yarn can be removed.

The heat fixing step adjusts the density and dimensions of the fabric by adjusting the density of the fabric shrunk in the refining step to a desired level as a product. In the present invention, the heat setting step may be performed at a temperature of 150 to 190 ° C, preferably 155 to 185 ° C, more preferably 160 to 180 ° C. The heat setting process temperature can be performed within the range described above in terms of minimizing heat shrinkage of the fabric and improving dimensional stability.

In the heat fixing process, the fabricating process can be completed by cooling the fabric using a cooling cylinder and then winding the fabric.

The heat-set fabric may be subjected to a step of laminating a thermoplastic polymer film to both sides of the fabric. The details of the components of the thermoplastic film are as described above.

In the present invention, lamination of the thermoplastic film such as the adhesive polymer film and the gas barrier polymer film is effective for effectively improving the mechanical properties of the airbag fabric and air permeation to the surface of the OPW fabric, . The lamination of the thermoplastic polymer film is carried out over the entire circular cross section. Such laminating can be carried out by a roll calendaring method, a flat bed calendaring method, a transfer calendering method, a flame laminating method, and preferably a roll calendering method calendaring method.

Particularly, as described above, in the present invention, the forming of the first and second lamination layers may include forming a laminated film in which a first lamination layer and a second lamination layer are sequentially laminated, And laminating the laminate on the surface of the fabric.

On the other hand, the laminating process preferably comprises the steps of providing a multi-layer structure, for example a two-layer multi-adhesive film comprising the adhesive laminate film of the first lamination layer and the gas-impermeable polymer film of the second lamination layer, And then thermocompression-bonding it to the substrate. Accordingly, the laminating process can be performed by selecting the process temperature within a temperature range that sufficiently melts the adhesive film of the first laminating layer and at the same time, the gas-impermeable polymer film of the second laminating layer as the protective layer is not thermally damaged have. In this regard, the laminating process for forming the first and second lamination layers may be performed at a temperature as high as about 30-40 DEG C higher than the melting point of the adhesive polymer film and at a temperature higher than the melting point of the gas-impermeable polymer film by about 20-30 DEG C And a low temperature. For example, the laminating process may be performed at a temperature ranging from 80 to 180 ° C, preferably from 120 to 170 ° C. When the laminating process is performed in such a temperature range, the adhesive film of the first laminating layer is sufficiently melted to easily penetrate into the inside of the fabric, and the film is uniformly coated with the gas barrier film of the second lamination layer .

The method of manufacturing a laminating fabric for an airbag according to the present invention may further comprise the step of forming a binder layer including a thermally crosslinkable material between the fabric surface and the first laminating layer. At this time, the details of the type and characteristics of the thermally crosslinkable substance are as described above.

The method of manufacturing a laminating fabric for an airbag of the present invention further includes the step of performing a corona pre-treatment, a plasma pre-treatment, a flame pretreatment, or an HF gas injection pre-treatment process on the surface of the fabric before forming the first laminating layer can do.

On the other hand, according to another embodiment of the invention, there is provided a vehicle airbag comprising an airbag cushion manufactured using the laminating fabric for the airbag.

The vehicle airbag of the present invention may have a conventional device well known to those skilled in the art. The airbag can be broadly divided into a frontal airbag and a side curtain airbag. The frontal airbag includes a driver's seat, a passenger's seat, a side protection, a knee protection, an ankle protection, and a pedestrian protection airbag. The side curtain type airbag protects the passenger in the event of a side collision or an overturning accident. Therefore, the airbag of the present invention includes both the front airbag and the side curtain airbag. The vehicle airbag of the present invention is particularly a side curtain airbag and has excellent performance in protecting a passenger in the event of an automobile side collision or overturning accident.

As described above, the airbag cushion manufactured using the fabric of the present invention exhibits excellent pressure-resistant performance particularly as a side curtain type airbag. For example, when the air permeability is measured by a method according to the method of the International Organization for Standardization ISO 9237 under a room temperature condition after the manufacture of the airbag cushion, more specifically, a static air permeability test is performed using a test area of 100 cm ² and a test test pressure may be 0.01 L / dm2 / min or less, preferably 0.00 L / dm2 / min or less under the condition of 500 pa. In the case of the static air permeability test conducted in the present invention, the amount of air escaping per unit time is measured when air pressure is applied to the fabric under a specific pressure. The closer the value is to 0, the better the gas barrier property of the fabric itself. Thus, the airbag cushion manufactured using the fabric of the present invention can exert excellent performance as a side curtain type airbag for rollover use.

When the airbag cushion is injected into the airbag under a room temperature condition at an instantaneous pressure of 25 bar and the internal pressure of the airbag is measured, preferably the initial maximum pressure is 50 KPa or more, the holding pressure after 6 seconds is 20 KPa or more, The subsequent holding pressure may be more than 5 KPa. The airbag cushion according to the present invention maintains the internal pressure retention ratio measured at room temperature under a condition of not more than 70%, preferably not less than 80%, more preferably not less than 90%, even under severe conditions of high temperature and humidity, The internal pressure retention rate after 6 seconds is also 50% or more, preferably 60% or more of the initial pressure under the above-described high-humidity and warm-temperature conditions,

In a preferred example of the present invention, the internal pressure of the airbag can be measured using a measuring device including a primary and a secondary high-pressure nitrogen tank and the like. In the above measuring apparatus, the primary high-pressure tank is filled with nitrogen at a high pressure, and then the first solenoid valve is opened by a computer so that nitrogen gas can be filled up to 25 bar in the secondary tank. When the secondary tank is filled, the first solenoid valve is closed, the second solenoid valve is opened by the computer, and the compressed nitrogen gas filled in the secondary tank at a pressure of 25 bar is instantaneously maintained at atmospheric pressure Exit and deploy the airbag. At this time, the initial maximum pressure in the airbag is measured through the pressure sensor, and the measurement result is transmitted to the computer. After a few seconds, the pressure is measured again and the computer records it.

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.

According to the present invention, by laminating a specific thermoplastic polymer film to the surface of a fabric in a multilayer structure, a fabric for an air bag excellent in mechanical properties and pressure resistance maintenance performance is provided.

Such a laminating fabric for airbags can be obtained by applying a laminate structure including a specific thermoplastic polymer film to a multilayer structure to significantly improve the airtightness of the airbag fabric and thereby to provide a high airtightness maintaining performance required for a side curtain airbag cushion, , It is possible to secure the anti-movement resistance, and at the same time to obtain excellent retention, shape stability, and air-blocking effect, thereby minimizing the impact on the passenger and safely protecting the passenger.

Therefore, the cushion to which the laminating fabric for an airbag according to the present invention is applied can be preferably used for an automobile airbag system and the like.

1 is a schematic view showing a general air bag system.
2 is a schematic view showing the structure and organization of a fabric layer in a laminating fabric for an airbag according to an embodiment of the present invention.
3 is a schematic view showing a cross-sectional shape of a fabric for a laminating airbag manufactured according to an embodiment of the present invention.
4 is a process schematic diagram schematically illustrating a process for manufacturing a laminating fabric according to an embodiment of the present invention.

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.

Example 1

A polyester fabric yarn (total denier D: 500 denier, number of filaments F: 144) was used to weave fabric fabrics for an airbag that was made of a 1/1 plain weave with a jacquard weaving machine. At this time, the weaving density was such that the warp density was 44 th / inch and the weft density was 44 th / inch

The fabric raw material was subjected to a refining process for preparing a medicine and passing through a water bath, and then a heat fixing process was continuously performed at a temperature of 160 to 190 ° C to prepare a processed paper for an air bag. Here, the weaving density of the fabric after refining and heat fixation was an oblique density of 46 th / inch and a weft density of 46 th / inch.

On the other hand, a polyurethane-based thermoplastic polymer film (30 占 퐉) having a melting point of 180 占 폚 and a polyurethane-based hot melt adhesive film (50 占 퐉) was used as the first laminating layer 2 lamination layer was prepared. After lamination to access the fabric processed on page fabric surface prepared as the above heat-adhesive multi-film as the first laminating layer is described above, 150 ℃, roll under a pressure of 5 N / cm ² Conditions - calendering (Roll-calendaring) A lamination process for a final side curtain airbag in which a two-layer structured multilayer laminating film was formed was prepared.

Example 2

(OPW) fabrics woven at a warp density of 43 th / inch and a weft density of 43 th / inch using a polyester yarn (total denier D: 600 denier, filament count F: 144) , A laminated fabric for an air bag was produced in the same manner as in Example 1. [

Example 3

A two-pack type thermo-cross-linkable material (polyurethane polymer adhesive) was pre-treated in a knife coating method on the surface of the processed fabric for airbags manufactured by performing the heat fixing process in the same manner as in Example 1, treated to form a binder layer, and then laminated so that the first laminating film layer was in contact with the surface of the binder layer, a laminated fabric for an air bag was produced in the same manner as in Example 1.

Example 4

Except that the polyolefin-based hot-melt adhesive film (50 占 퐉) having a melting point of 110 占 폚 was used instead of the polyurethane-based hot-melt adhesive film to form the first laminating film layer. A laminated fabric for an air bag was prepared in the same manner as in Example 1.

Comparative Example 1

(OPW) fabrics were weaved with a Jacquard weaving machine using a polyester yarn (total fineness D: 500 denier, number of filaments F: 144). At this time, the weaving density was such that the warp density was 44 th / inch and the weft density was 44 th / inch

The fabric raw material was subjected to a refining process for preparing a medicine and passing through a water bath, and then a heat fixing process was continuously performed at a temperature of 160 to 190 ° C to prepare a processed paper for an air bag. Here, the weaving density of the fabric after refining and heat fixation was an oblique density of 46 th / inch and a weft density of 46 th / inch.

The surface of the fabric thus fabricated was coated with a liquid silicone coating agent (TCS7517) of 2-liquid type at a weight per unit area of 25 g / m < 2 >, and finally fabricated for the airbag through a winding process .

Comparative Example 2

Except that a hot melt adhesive film layer of the first laminating film layer was not formed and a polyurethane film was directly laminated on the surface of the fabric and thermally pressed to form a second lamination layer, To fabricate a side curtain airbag fabric.

Comparative Example 3

Except that a hot melt adhesive film layer of the first laminating film layer was not formed and a polyurethane-based polymer component was sprayed directly onto the fabric surface with a T-die melt extruder to form a second laminating layer. A fabric for a side curtain airbag was produced in the same manner as in Example 1.

Comparative Example 4

(Laminated) fabric for airbags was produced in the same manner as in Example 1, except that a urethane-based hot-melt adhesive film (50 占 퐉) having a melting point of 160 占 폚 was used as a hot-melt adhesive film layer of the first laminating film layer Respectively.

Various physical properties of the airbag fabric prepared according to Examples 1 to 3 and Comparative Examples 1 to 4 were measured by the following methods. The measured physical properties are summarized in Table 1 below.

(a) Tensile strength and elongation

Tensile strength and elongation of Warp and Fill were measured according to the method of International Standardization Organization ISO 13937-1.

Tensile strength refers to the resistance to stretching in the longitudinal direction and represents the strength of the fabric. The fabric specimens were cut into 50 x 300 mm in width and length. Each specimen was stretched in the longitudinal direction at a speed of 200 mm / min after being immersed in an upper / lower jig of a tensile tester, and then the tensile strength was measured based on the peak point at the time of tearing of the final fabric.

(b) Tear strength

Tear strength of Warp and Fill was measured according to the method of International Standardization Organization ISO 13937-2.

The resistance to heat, which is the tear strength, is the force required to tear the fabric. The specimens were prepared by cutting the top and bottom of the square specimen. One side was stuck to the upper jig and the other side was stuck to the lower jig.

(c) scrub resistance

The scrub characteristics of the fabric under room temperature conditions were evaluated using a scrub resistance measuring device according to the method of International Standardization Organization ISO 5981.

First, a specimen is cut with a laminating / coating fabric for an airbag, the fabric specimen is pressed with a press in the scrub test apparatus, the fabric specimen is repeatedly held on both sides of the specimen, and a scrub test is performed to form a laminating layer or a coating layer The number of strokes before the start of peeling was measured.

At this time, the scrubbing resistance measurement is performed by measuring the total number of reciprocating movements of the wearer under the condition of a pressure force of 10 N. If the coating layer is not peeled off after every 50 strokes, When the laminating layer or the coating layer is peeled off, the reciprocating motion is stopped and the " fail " The number of strokes at which the laminating layer or the coating layer was peeled off was measured in the warp / weft direction of the fabric.

(d) Adhesive strength

The peel strength between the adhesive film and the adherend was measured according to the method of ASTM D 1876 of the American Society for Testing and Materials. The specimens were cut into a size of 50 x 200 mm in width and length. After attaching the adhesive film and the adherend (circular cross-section) to the jig, the film was pulled at a speed of 100 mm / min to measure the peel strength And the measurement interval was set to 100 mm.

(e) Air permeability

The static air permeability according to the method of International Organization for Standardization ISO 9237 was measured. At this time, the test area was 100 cm ² and the test pressure was set to 500 pa.

division Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Fabric Type PET PET PET PET PET PET PET PET Fabric Finish (Denier) 500 600 500 500 500 500 500 500 Weaving density (thread / inch) 46X46 43X43 46X46 46X46 46X46 46X46 46X46 46X46 Weaving type Plain weave Plain weave Plain weave Plain weave Plain weave Plain weave Plain weave Plain weave Of polymer film
Fabric surface coating method Laminating Laminating Laminating Laminating Liquid silicone coating Laminating Laminating Laminating Adhesive layer
(Adhesive layer) Urethane hot melt Urethane hot melt Urethane hot melt Olefin series
Hot melt -
(silicon) radish radish Urethane-based
Hot melt Adhesive layer
Melting point temperature (캜) 120 120 120 110 - - - 160 Protective layer
(Protective layer) Poly
urethane Poly
urethane Polyurethane Poly
amides -
(silicon) Poly
urethane Poly
urethane Poly
urethane Total multi adhesive film thickness (mm) 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 Pressurization temperature (℃) 150 150 150 150 Not applicable 150 Not applicable 150 Pressure (N / cm ² ) 5.0 5.0 5.0 5.0 Not applicable 5.0 Not applicable 5.0 Whether preprocessing Unapplied Unapplied Urethane binder Unapplied radish radish radish radish Tensile strength (N / 5 cm) -Warp 3,387 4,132 3,392 3,387 3,238 3,328 3,392 3,315 Tensile strength (N / 5 cm) -Fill 3,492 4,212 3,432 3,452 3,392 3,421 3,432 3,407 Elongation (%) - Warp 33 34 32 31 32 33 32 32 Elongation (%) - Fill 28 32 28 28 29 31 28 29 Film adhesion strength (N / mm) 1.2 1.3 2.4 1.3 Not applicable 0.2 0.6 0.2 Tear strength (N / mm) -Warp 342 389 357 352 297 297 315 256 Tear strength (N / mm) -Fill 327 392 348 342 302 285 322 242 Scrub (Strokes) 1,000 1,000 1,000 1,000 800 200 500 50 Air permeability (L / dm2 / min) 0.00 0.00 0.00 0.00 0.03 0.04 0.02 0.08

As shown in Table 1, the airbag fabrics of Examples 1 to 4 laminated with the thermoplastic film according to the present invention were found to have excellent physical properties in terms of tensile strength, elongation, tear strength, adhesive strength, and scratch resistance . Particularly, it can be seen that the peel strength of the adhesive film and the fabric measured by the ASTM D 1876 method is 1.2 to 2.4 N / mm, both of 1.0 N / mm or more, in the laminating airbag fabric of Examples 1 to 4. It can be seen that the airbag fabrics of Examples 1 to 4 have all the scrubbing properties of 1,000 strokes or more and the air permeability is 0.00 L / dm2 / min or less and have excellent durability and internal pressure holding performance. Thus, the airbag fabric according to Examples 1 to 4 according to the present invention has excellent film adhesion, durability and excellent air permeation prevention property, so that it is possible to more effectively protect the passenger of a car in the event of a car accident, Ejection Mitigation can be satisfactorily satisfied.

On the other hand, it has been confirmed that the airbag fabrics of Comparative Examples 1 to 3 using only the silicone coating and gas barrier film do not satisfy such characteristics. Particularly, the airbag fabrics of Comparative Examples 1 to 4 have a scratch resistance of only 50 to 800 strokes, an air permeability of 0.03 to 0.08 L / dm 2 / min, and a mechanical property and a pressure resistance The performance is remarkably decreased. Further, in Comparative Examples 2 to 4, the film adhesion peel strength was 0.2 to 0.6 N / mm, all of which were significantly lower than 0.8 N / mm. Further, in the case of Comparative Example 4, it was found that the adhesion temperature of the first lamination layer was too high, so that sufficient melting was not generated, and the bonding strength remarkably dropped to 0.2 N / mm. As a result, the peeling strength of the adhesive film of the airbag fabric of Comparative Examples 1 to 4 is significantly lowered, which may cause a problem that the passenger can not be effectively protected at the time of an automobile accident.

1: Unwinding Roll (Feeding Roll)
2: Winding Roll (take-up roller)
3: laminating film roll (film feeding roller)
4: heating calendar roll (calender roll)
5: Heating chamber (chamber)
6: Pressing nip-roll (pressure roller)
7: Fabric (Fabric)
8: Laminating multi-film (laminating film)

Claims (13)

A first laminating layer comprising an adhesive polymer film having a melting point of from 50 to 150 DEG C on the surface of the fabric and a second lamination layer comprising a gas-impermeable polymer film having a melting point of at least 100 DEG C are sequentially formed. The method according to claim 1,
Wherein a surface of the fabric is in contact with one side of one side of the first laminating layer and the other side of the first laminating layer is in contact with the second laminating layer. The method according to claim 1,
Wherein the first laminating layer comprises a polyolefin polymer, a polyester polymer, a copolyester polymer, a thermoplastic polyurethane polymer, a polyamide polymer, a copolyamide polymer, an ethylene vinyl acetate polymer, and an acrylate polymer ≪ / RTI > wherein the laminating fabric comprises at least one selected from the group consisting of: The method according to claim 1,
Wherein the second laminating layer comprises at least one selected from the group consisting of a polyamide-based polymer, a copolyamide-based polymer, a thermoplastic polyurethane-based polymer, and an ethylene-based copolymer. The method according to claim 1,
Wherein the first laminating layer and the second laminating layer have a total film thickness of 50 to 200 占 퐉. The method according to claim 1,
Wherein the fabric comprises at least one fiber selected from the group consisting of nylon-based fibers, polyester-based fibers, polyolefin-based fibers, and aramid-based fibers. The method according to claim 1,
Wherein the fabric comprises fibers having a total fineness of 210 to 840 denier. The method according to claim 1,
Further comprising a binder layer comprising a thermally crosslinkable material between the fabric surface and the first laminating layer. 9. The method of claim 8,
Wherein said thermally crosslinkable material is at least one selected from the group consisting of a polyurethane polymer, an acrylic polymer, and a vinyl acetate polymer. Weaving the fabric;
Refining said woven fabric;
Opening and polishing the refined fabric; And
Sequentially forming on the surface of the heat-set fabric a first laminating layer comprising an adhesive polymer film having a melting point of from 50 to 150 DEG C and a second lamination layer comprising a gas-impermeable polymer film having a melting point of at least 100 DEG C ;
≪ / RTI > 11. The method of claim 10,
The step of forming the first laminating layer and the second laminating layer may include a step of laminating the laminated film on the surface of the fabric after the laminated film in which the first laminating layer and the second laminating layer are sequentially laminated, Further comprising the steps of: providing a laminating fabric for an airbag; 12. The method of claim 11,
Wherein the forming of the first and second laminating layers is performed by a roll calendering method, a flatbed calendering method, a transfer calendering method, or a flame laminating method. A vehicle airbag comprising an airbag cushion made of a laminating fabric for an airbag according to any one of claims 1 to 9.

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