KR20140070444A - Fabric for side curtain airbag including laminated layers - Google Patents

Abstract

The present invention relates to a laminating fabric for a side curtain air bag and, especially, to a laminating fabric for a side curtain air bag having a multilayer laminating layer including a specific thermoplastic polymer film on the surface of the fabric. According to the present invention, excellent storage, shape stability and airproof effects are provided to protect a passenger safely during vehicle collisions or overturns while simultaneously ensuring high inner pressure maintenance, high tensile strength, tearing strength, and sliding resistance required for a side curtain air bag cushion by attaching the specific thermoplastic polymer film to the surface of the fabric by a multilayer laminating method.

Description

{FABRIC FOR SIDE CURTAIN 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.

As described above, the curtain airbag among the airbags used in automobiles can protect passengers from secondary collision or vehicle rollover as the internal pressure is maintained for a certain period of time by the airbag protecting the passenger 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 the side curtain airbag manufacturing method which is made by coating the silicone coating agent or the 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, There is also a need for research into the development of improved side curtain airbag fabrics.

The present invention provides a fabric for a side curtain airbag that minimizes the damage of the fabric to a strong pressure and temperature during deployment of the airbag, maintains the inflation pressure for a certain period of time and excellent expansion performance.

The present invention also provides a method of manufacturing the fabric for the side curtain airbag.

The present invention is a laminate comprising a first lamination layer comprising an adhesive polymer film and a second lamination layer comprising a gas-impermeable polymer film on the surface of the fabric; 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 >group; 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 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 forming a first laminating layer comprising an adhesive polymer film on the surface of the heat-set fabric, followed by forming a second laminating layer comprising a gas-impermeable polymer film on the surface of the first laminating layer And the first laminating layer is a laminate film comprising 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 , And the second laminating layer includes 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 Of manufacturing laminating fabric for side curtain airbag Provided.

Hereinafter, a laminating fabric for a side curtain airbag according to a specific embodiment of the present invention, a manufacturing method thereof, and a vehicle airbag 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 manufacturing a side curtain airbag by bonding a multilayer thermoplastic polymer film to a fabric surface in a laminating manner at the time of manufacturing a fabric for a side curtain airbag so as to exhibit excellent airbag deployment performance and 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 a side curtain airbag is provided in which a particular thermoplastic polymer film is laminated in a multilayer. Wherein the fabric for the side curtain airbag is formed by a first laminating layer comprising an adhesive polymer film on the surface of the fabric and a second laminating layer comprising a gas-impermeable polymer film; 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 >group; 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.

In the present invention, the fabric for the side curtain airbag refers to a fabric or a nonwoven fabric used for manufacturing a side curtain 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 fineness of the fibers may be from 300 to 600 denier, and the fineness is preferably 300 denier or more from the viewpoint of strength, and the thickness of the yarn is preferably 600 denier or less from the aspect of retention. 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 the side curtain 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. In particular, the fabric includes an expanding portion having a component property by a gas, a non-expanding portion for supporting the expanding portion, and a folding portion that forms a boundary between the expanding portion and the non- The inflating portion may comprise a double-woven pattern structure in which the upper and lower fabric layers to be woven simultaneously are separated from each other.

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 tissue of the top and bottom fabric layers in the double-woven fabric may comprise a tissue of 1 X 1, a tissue of 2 X 2, a tissue of 3 X 3, a triceps, a pyramid, a wig or a mixture thereof.

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

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 side curtain airbag cushion including the laminating layer exhibits excellent internal pressure maintaining performance when the cushion is actually deployed compared to a conventional side curtain airbag cushion including a silicone and polyurethane coating layer and exhibits excellent folding performance of the airbag cushion. A laminated layer on which these thermoplastic films are laminated can be formed on both sides of the fabric surface. In the side curtain airbag fabric of the present invention, such a thermoplastic film is applied to the surface of the fabric by a laminating method. The thermoplastic film has excellent internal pressure retention performance in spite of a low application amount, And has excellent physical property maintenance performance.

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

In the case of the above-mentioned adhesive film, a polyolefin-based polymer, a polyester-based polymer, a copolyester-based polymer, a thermoplastic polyurethane-based polymer, a polyamide- (Copolyamide) polymer, EVA (Ethylene Vinyl Acetate) polymer, and an acrylate (Polymer) 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 .

In the case of a cover film having a function of blocking the inflator gas by adhering to the adhesive film, a polyamide-based polymer and a copolyamide-based polymer, a thermoplastic polyurethane-based polymer, an ethylene copolymer Based polymer may be one or more selected from the group consisting of a polyamide-based polymer, a copolyamide-based polymer and a polyamide-based polymer in view of adhesiveness with an adhesive film and gas- Based polymer and a thermoplastic polyurethane-based polymer are preferable.

In the airbag fabric of the present invention, the adhesive polymer film of the first 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. 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 the side curtain 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, the laminating layer including the thermoplastic film (adhesive film and cover film) such as the adhesive polymer film and the gas-barrier polymer film, for example, the first lamination layer and the second lamination layer as a whole, 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 first 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 adequate blocking property of the inflator gas during deployment of the airbag cushion. It can be less than 23 g / m ² in terms of folding property and price.

The laminating fabric for a side curtain airbag of the present invention is obtained by laminating a specific thermoplastic polymer film as described above to the surface of a fabric so that the internal pressure retaining performance measured by the side curtain airbag cushion expansion test method of FIG. The inner pressure maintenance performance of the urethane coated side curtain airbag cushion was about twice as high, and the folding performance of the airbag cushion improved by more than 20%.

In addition, the laminating fabric for the side curtain airbag may have a scrubbing property of 400 times or more, preferably 500 to 3,000 cycles, as measured by an International Standardization Organization ISO 5981 method. This is because when the airbag cushion is deployed, It is possible to prevent a delamination phenomenon in which the laminating layer is peeled off from the surface of the raw fabric due to high-pressure gas.

In addition, the laminating fabric for the airbag may have a toughness of 100 N or more, preferably 150 N to 450 N, measured by the DIN 53356 method. This can prevent the tear of the fabric due to the high-temperature / high-pressure gas when the airbag cushion is deployed. Also, the material strength of the fabric measured by the American Society for Testing and Materials Standards ASTM D 5822 method may be 800 N or more, preferably 1,000 N or more. This can prevent the seam portion of the fabric from being broken due to the high-temperature / high-pressure gas when the airbag cushion is deployed.

On the other hand, according to another embodiment of the invention, a method for manufacturing a laminating fabric for a side curtain 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.

A laminating fabric for a side curtain airbag according to the present invention comprises: weaving a fabric; Refining said woven fabric; Opening and polishing the refined fabric; And forming a first laminating layer comprising an adhesive polymer film on the surface of the heat-set fabric, followed by forming a second laminating layer comprising a gas-impermeable polymer film on the surface of the first laminating layer do. Here, the first laminating layer may comprise at least one of 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 , And the second laminating layer includes 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 .

In addition, the laminating fabric for the side curtain airbag of the present invention is formed by laminating a thermoplastic polymer adhesive film directly adhering to the surface of a heat-set fabric and a cover film for air blocking to form a lamination layer Step or pre-treatment on the surface of the heat-set fabric, followed by forming a lamination layer in which a thermoplastic polymer adhesive film and a cover film for air-blocking are laminated .

In the present invention, the laminating fabric for the side curtain airbag can be manufactured by weaving the fabric using fibers as wefts and slopes, and refining and heat fixing processes. At this time, the fabric weaving step may be performed by weaving the upper and lower side fabric layers which are woven simultaneously with the one piece woven (OPW) method.

In order to improve the yarn collecting property at the time of weaving, the yarn can be subjected to oblique sliver beam oiling or sizing treatment, and preferably, (Oiling) method is used.

The next step, the weaving step, the refining step, and the heat fixing step, can be applied to commonly 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 heat-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 cover film is further laminated on the adhesive layer . Second, a method of directly laminating the adhesive layer and the cover layer on the surface of the fabric using a product made of a single 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 cover film) may be applied. In the present invention, any of the above three methods may be adopted as the laminating step.

The details of the fiber type and fineness of the fabric, the composition and the composition of the first and second laminating layers, the types and characteristics of the thermoplastic film, and the like are as described above in the method for producing the fabric for the side curtain airbag.

In the present invention, the side curtain airbag weaving process is a process of arranging warp yarns and weft yarns at regular intervals to form a raw cloth. In the fabric weaving process, the weaving form of the fabric is not limited to a specific form, Do. 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 weft density of the fabric for the side curtain airbags, the oblique direction density may be 48 to 60 th / inch, more preferably 51 to 57 th / inch. The weft direction density may be 48 to 55 th / inch, more preferably 49 to 52 th / inch. The warp density and weft density of the polyester fabric may be 48 th / inch or more, that is, 48 or more warps per inch and 48 yarns per inch in terms of securing excellent mechanical properties of the airbag fabric, And 60 t / inch and 55 t / inch or less, respectively. That is, the warp and weft per inch of the fabric may be 60 and 55 or less, respectively.

In order to ensure airtightness at the fabric for the side curtain airbag, the elongation is minimized by enduring the tensile force by high-pressure air or the like. At the same time, in order to secure sufficient mechanical properties in the operation of the airbag, Is very important. Accordingly, the fabric is woven and processed so that the cover factor of the fabric is 2,000 to 2,500 according to the following formula 2, thereby improving airtightness and energy absorption performance at the time of deploying the airbag.

[Equation 2]

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. Particularly, it is possible to remove medicines such as oiling and sizing which are used to increase the property of the yarn during the weaving process.

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 performed by a roll calendaring method, a flatbed laminating method, a transfer calendering method, a flame laminating method, and preferably a flatbed laminating method ) Method.

In a preferred embodiment of the present invention, the flatbed laminating process may utilize an apparatus as shown in Fig. The first lamination layer and the second lamination layer in the apparatus can be prepared in a film state as separate rolls or as a single bonded film state roll. Preferably, the first and second lamination layers may be prepared together as a single bonded film state roll. In the apparatus, the fabric may be wound and then prepared as a roll after the above-described refining and heat treatment processes. The prepared laminating layer fabric passes through a heating zone, a press roller, and a cooling zone in the order of a heating zone, a press roller, a cooling zone, a conveying belt, and a conveying belt roller, While the adhesive polymer film, which is a thermoplastic polymer film, is melted in the heating zone, applied to the fabric, pressed, and bonded to the fabric while cooling in the cooling zone. This will be completed at the end. The above process may be carried out on both sides or on both sides, preferably both sides simultaneously. In the present invention, the heating zone may be performed at a temperature of 110 to 180 ° C, preferably 115 to 175 ° C, more preferably 120 to 170 ° C. The heating zone process temperature can be performed in the range as described above in terms of minimizing heat shrinkage of the fabric and film, improving dimensional stability, and enabling the thermoplastic adhesive polymer film to exert proper adhesion performance.

The method of manufacturing a laminating fabric for a side curtain airbag of the present invention may further include 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 a side curtain airbag of the present invention also includes the step of performing a corona pre-treatment, a plasma pretreatment, a flame pretreatment, or an HF gas injection pre-treatment process on the surface of the fabric before forming the first laminating layer As shown in FIG.

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 site curtain airbag.

The vehicle airbag of the present invention may have a conventional device well known to those skilled in the art. The airbag is a side curtain airbag that protects the passenger in the event of a side collision or an 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 instantaneous pressure of 25 bar is injected into the airbag without a separate aging process after the manufacture of the airbag cushion, the maximum pressure at initial inflation (during deployment) is 40 kPa or more, the pressure after 6 seconds has passed is 25 kPa Or more, so that it is possible to exert excellent performance as a side curtain type airbag for rollover use.

Particularly, in the airbag of the present invention, when the airbag cushion is deployed through the deployment test equipment shown in Fig. 5 using the fabric laminated with the thermoplastic film as described above, To < RTI ID = 0.0 > 100, < / RTI >

[Equation 1]

Q = [internal pressure (A2) after 12 seconds / internal pressure (A1) after 6 seconds) 占 100

In the formula, A1 is a measured value (KPa) of the internal pressure after 6 seconds when the air bag cushion is deployed by momentarily injecting a nitrogen compressed gas of 25 bar into the air and A2 is a nitrogen compressed gas of 25 bar by air (KPa) measured 12 seconds after the air bag is inflated instantaneously and the airbag cushion is deployed.

When the airbag cushion is deployed, the above-mentioned fluctuation rate (Q) is necessary for protection of passengers in the event of roll-over, and the higher the rate of change, the better the internal pressure maintenance performance of the airbag cushion, . In the case of the internal pressure maintaining fluctuation rate, it may be 10 or more in terms of satisfying the recently enhanced North American automobile test regulations (Ejection Mitigation), and in the case of overturning accident, the internal pressure of the airbag cushion is too high, The value can be less than 100.

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 an apparatus as shown in Fig. 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 charged at the pressure of 25 bar in the secondary tank is instantaneously maintained at atmospheric pressure I get out of the airbag 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 a side curtain airbag which is excellent in mechanical properties and pressure-holding performance is provided.

The laminating fabric for the side curtain airbag significantly improves the airtightness of the airbag fabric by applying the lamination layer including a specific thermoplastic polymer film to the airbag fabric, thereby achieving high pressure resistance maintenance performance, high tensile strength, The tear strength and the anti-tearing resistance can be secured, the excellent storage stability, the shape stability, and the air blocking effect can be obtained, so that the shock to the passenger can be minimized and the passenger can be safely protected.

Accordingly, the cushion to which the laminating fabric for the side curtain 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 a site curtain airbag according to an embodiment of the present invention.
3 is a schematic view showing a cross-section of a laminating layer of a multilayer structure of a laminating fabric for a site curtain airbag according to an embodiment of the present invention.
Figure 4 is a schematic view of a flatbed laminating apparatus for making a laminating fabric for a side curtain airbag according to an embodiment of the present invention.
5 is a schematic view showing an apparatus for measuring an internal pressure of an airbag according to an embodiment of the present invention.
6 is a graph showing the internal pressure-maintaining performance of each type of side curtain airbag.

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

(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 set to be a slope density of 54 th / inch and a weft density of 44.5 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 a slope density of 57 th / inch and a weft density of 49 th / inch.

Using a thermoplastic polymer film of polyolefin series (Nolax, 15 탆) on the surface of the raw fabric of the fabric thus processed, roll calendering was performed under the conditions of a temperature of 110 캜 and a pressure of 0.5 bar for 10 seconds, calendaring method to form a first film layer to be an adhesive film. A thermoplastic polymer film of polyamide series (Nolax Co., Ltd., 30 占 퐉) was roll calendering under the condition of a temperature of 185 占 폚 and a pressure of 1.0 bar for 15 seconds on the outer surface of the adhesive film. ) ≪ / RTI > method to produce a second film layer to be a gas barrier layer.

The lamination layer laminated to the fabric surface in this manner was formed at 30 g / m ² per unit fabric area. In the same manner as described above, the opposite fabric surface was also laminated in the same manner, and finally, a laminating fabric for a final side curtain airbag was manufactured through a winding process.

Example 2

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, The laminated fabric for airbags was prepared in the same manner as in Example 1, except that the first laminating film layer was formed.

Example 3

Laminating for a side curtain airbag was carried out in the same manner as in Example 2 except that a first laminating film layer was formed using a thermoplastic polyurethane (TPU, ASSEMS, 20 占 퐉) instead of a polyolefin thermoplastic polymer film Fabrics were prepared.

Example 4

A thermoplastic polymer film of a polyolefin series and a thermoplastic polymer film of a polyamide series were laminated on the outer surface of the processed surface of the processed paper for an airbag manufactured by performing the heat fixing process in the same manner as in Example 1 (Nolax, 40 μm) was laminated by a flatbed laminating method under the conditions of a heating zone and a press roll at a temperature of 130 ° C. and a pressure of 1.0 bar for 10 seconds to form an adhesive film (Adhesive film and a second film layer to be a gas barrier layer at the same time.

The lamination layer laminated to the fabric surface in this manner was formed at 30 g / m ² per unit fabric area. In the same manner as described above, the opposite fabric surface was also laminated in the same manner, and finally, a laminating fabric for a final side curtain airbag was manufactured through a winding process.

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 set to be a slope density of 54 th / inch and a weft density of 44.5 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 a slope density of 57 th / inch and a weft density of 49 th / inch.

The surface of the fabric thus fabricated was coated on both sides with a liquid silicone coating agent (Dow Coating, DC3730) at a surface area of 30 g / m 2 per unit area of fabric. Finally, a final side curtain airbag fabric .

Comparative Example 2

A fabric for a side curtain airbag was manufactured in the same manner as in Comparative Example 1, except that a fabric was produced by changing a polyester yarn (total fineness D: 420 denier, number of filaments F: 136).

Comparative Example 3

A fabric for a side curtain airbag was manufactured in the same manner as in Comparative Example 1, except that a dry polyurethane coating agent (DAT 7600) was used instead of the liquid silicone coating agent.

Comparative Example 4

Roll calendering was carried out under the condition of pressing for 15 seconds at a temperature of 85 ° C and a pressure of 0.5 bar using a polyvinyl chloride (PVC) film (synthetic resin, 25 μm) To form a first film layer to be an adhesive film, and finally, a winding process was performed without performing the second laminating layer forming step. Here, the fabric for the side curtain airbag was manufactured in the same manner as in Example 1, except that only the first laminating layer was formed without the second laminating layer.

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

(a) scrub resistance

The scrubbing characteristics of the fabric were evaluated using an internal scrub resistance measuring device according to the international standardization organization standard 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 times before the peeling was started was measured.

At this time, the scrubbing resistance measurement is performed by measuring the total number of reciprocating movements of the wearer under a pressure force of 10 N. If the coating layer is not peeled 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 times at which the laminating layer or the coating layer was peeled was measured in the warp / weft direction of the fabric.

The laminating or coated fabric specimens were tested for scrub resistance at room temperature conditions and at 70 ° C, 95%, and 408 hr, respectively, after aging. When the number of scrubbing times measured by the above-described method is at least 1,000 cycles in both the room temperature condition and the aging condition, it is evaluated as "good ", and when at least one case of less than 1,000 cycles is included "Poor ".

(b) Tear strength

The tear strength in the warp / weft direction was measured according to German Industrial Standard DIN 53356.

The resistance to heat, which is the tear strength, is the force required to tear the fabric. Prepare the specimen 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) Seal strength

According to ASTM D 5822 of the American Society for Testing and Materials (ASTM D 5822), the breaking strength of the same position of the laminating fabric before / after the development test was measured.

Sealant strength refers to the strength of the seam part where the active chamber and seam area where the air bag gas enters. The specimens were cut so that the seam was centered, fixed to the lower clamp of the seam strength measuring device according to the American Society for Testing and Materials (ASTM D 5822), and the upper clamp was moved up to measure the strength of the airbag cushion specimen when it fractured

(d) Internal pressure maintenance test

As shown in FIG. 5, after the air bag was deployed by instantaneously injecting nitrogen compressed gas of 25 bar into the air, the change of the air bag internal pressure was observed over time, and the initial maximum pressure at the time of the instantaneous pressure injection, Respectively, were measured.

division Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Test my scrub
(Room temperature) Good Good Good Good Good Good Bad Bad Test my scrub
(Aging) Good Good Good Good Good Good Bad Bad Tear strength (N) 220 240 200 240 180 190 170 130 Seam strength (N) 1200 1230 1180 1250 1050 1100 950 800 Internal pressure test
(Initial pressure, KPa) 103 110 102 107 80 75 75 65 Internal pressure test
(Pressure after 6 seconds, KPa) 55 60 45 57 10 13 13 8 Internal pressure test
(Pressure after 12 seconds, KPa) 35 40 25 38 2 3 One One

As shown in Table 1, the airbag fabrics of Examples 1 to 4, in which the thermoplastic film was laminated according to the present invention, were found to have excellent physical properties in the inner pressure holding test, the tear strength, the seam strength, and the scrub test. Particularly, in the internal pressure maintaining test of the laminating airbags of Examples 1 to 4, the initial pressure was all 100 KPa or more, the internal pressure after 6 seconds passed was 45 KPa or more, and the internal pressure after 12 seconds passed was 25 KPa or more, In the event of an accident (roll over), passengers can be more effectively protected, and the enhanced North American automobile safety regulations (Ejection Mitigation) can be fully satisfied.

On the other hand, it was confirmed that the airbag fabrics of Comparative Examples 1 to 4, to which the silicone coating and the polyurethane coating were applied, did not satisfy these characteristics. Particularly, since the internal pressure maintaining performance after 6 seconds and 12 seconds after the airbag deployment remarkably deteriorates, it is impossible to effectively protect the passenger of a car when the vehicle is rolled over.

Experimental Example

Airbag cushions were produced using the fabric for airbags according to Examples 1 to 4 and Comparative Examples 1 to 4, and car airbags were made with CAB (Curtain Airbag) cushion assemblies, respectively, as shown in Table 2 below. The thus-completed vehicle airbag was subjected to a static expansion performance test (for example, an air conditioner at room temperature: 25 DEG C for 4 hours in an oven, hot: 85 DEG C for 4 hours in an oven, Cold: -30 DEG C for 4 hours in an oven) static test).

As a result of the above static test, it was evaluated as "Pass" in the case where no tearing, pinhole, or raw carbonization occurred, and the tearing, sewing pinhole, Failure "when any one of the occurrence or the raw carbonization occurred. If the result of the deployment test is "Pass", it can be used as a cushion for an airbag. If it is "Fail", it means that it can not be used as a cushion for an airbag.

The results of the static static performance test (static test) of the airbag cushions manufactured using the airbag fabric of Examples 1 to 4 and Comparative Examples 1 to 4 are shown in Table 2 below.

division Cushion Specifications Abbreviation
Inflator
Pressure (kPa) Abbreviation
Inflator
Temperature (℃) Room temperature
Deployment test
(Static) Hot
Deployment test
(Static) Cold
Deployment test
(Static) Example 1 CAB (OPW) 220 320 Pass Pass Pass Example 2 CAB (OPW) 220 320 Pass Pass Pass Example 3 CAB (OPW) 220 320 Pass Pass Pass Example 4 CAB (OPW) 220 320 Pass Pass Pass Comparative Example 1 CAB (OPW) 220 320 Pass Fail Pass Comparative Example 2 CAB (OPW) 220 320 Pass Fail Pass Comparative Example 3 CAB (OPW) 220 320 Fail Fail Pass Comparative Example 4 CAB (OPW) 220 320 Fail Fail Fail

On the other hand, according to the present invention, the OPW laminated product (OPW laminated) and the various side curtain airbags laminated according to the present invention, that is, the silicone coated OPW air bag product (silicone coated), the sewing bag, A graph showing the results of the maintenance performance test is shown in Fig. As shown in FIG. 6, the OPW laminated product according to the present invention has superior pressure holding performance even after the airbag deployment, compared to the CAB (OPW fabric, silicone coated) coated with silicone and the sewed bag (CAB) You can confirm that you are doing.

As shown in the above Table 2, the vehicle airbags including the fabric for the side curtain airbags of Examples 1 to 3 according to the present invention were allowed to stand in an oven under three different heat treatment temperature conditions, and then subjected to a static static performance test. And the upper limit test are all performed. As a result, it can be understood that there is no tearing of fabric, occurrence of pin hole of sewing part, and carbonization of raw fabric, all of which have excellent performance as a vehicle airbag.

In the case of the static test, the initial airbag cushion is designed and evaluated as the most basic deployment test. Only the module with the airbag cushion is evaluated, and the most normal temperature And deployment pressure. Quot; Pass "in the above-mentioned static static performance test (static test), it can be mass-produced as a cushion for an airbag.

On the other hand, in the static test results of the static airbags for the vehicle airbags including the fabric for the side curtain airbags of Comparative Examples 1 to 4, the silicone-coated Comparative Examples 1 and 2 exhibited "Pass "But evaluated as" Fail "under the hot condition, and the product of Comparative Example 3 with the polyurethane coating was" Pass "only in the cold condition, and the evaluation result was" Fail "in both the room temperature and the hot condition, It can be seen that the vehicle airbag including the fabric for the airbags 1 to 3 is unusable as an actual airbag. It can be understood that the vehicle air bag including the air bag fabric of Comparative Example 4 can not be used as an actual air bag by obtaining the evaluation result that the product of Comparative Example 4 is "Fail" at both the normal temperature, hot and cold conditions.

Particularly, in the development test of the cushion assembly including the fabric of Comparative Example 1 and Fabric 2, the far-end expansion phenomenon and the carbonization phenomenon occurred at the seam portion which is the boundary point between the inflated portion and the non- inflated portion of the cushion. In the inflator inlet part, the seam part, and the expansion part, the tearing of the fabric and the widening and carbonization phenomena occurred. In the case of the comparative example 4, there was also a phenomenon that the material of the polymer on the surface of the fabric was peeled together with the tearing of the fabric and the expansion and carbonization phenomena in the inflator inlet part, the seam part and the expansion part.

Therefore, the airbag fabric of Comparative Examples 1 to 4 may cause a great risk to the airbag function due to airbag rupture or the like when it is applied to an actual airbag cushion for a vehicle. In addition, even if the airbag cushion performance is not satisfied even under the short heat treatment time conditions of room temperature, high temperature, and low temperature, if a car collision occurs while the fabric is stored for a long time at a high temperature, the safety of the passenger is not guaranteed at all .

Claims (19)

A first laminating layer comprising an adhesive polymer film on the surface of the fabric and a second laminating layer comprising a gas-impermeable polymer film,
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 And at least one selected from the group consisting of
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,
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, for laminating fabric for side curtain airbags. The method according to claim 1,
The gas-impermeable polymer film of the second 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, for laminating fabric for side curtain airbags. The method according to claim 1,
Further comprising a binder layer between the fabric surface and the first laminating layer, the laminating fabric comprising a thermally crosslinkable material. 5. The method of claim 4,
The thermally crosslinkable material is at least one selected from the group consisting of a polyurethane polymer, an acrylic polymer, and a vinyl acetate polymer. The method according to claim 1,
The first laminating layer and the second laminating layer being laminated at 15 to 45 g / m ² per unit fabric area. The method according to claim 1,
Wherein the fabric comprises a double-woven pattern fabric that is woven simultaneously and forms top and bottom sides that are separate from each other. 8. The method of claim 7,
Wherein the double-woven patterned tissue comprises 1 x 1 tissue, 2 x 2 tissue, 3 x 3 tissue, junior, pseudo-woven, woven, or blend fabrics thereof. The method according to claim 1,
Laminating fabric for side curtain airbags with an internal scrub property of 400 cycles or more as measured by the International Organization for Standardization ISO 5981 method. The method according to claim 1,
Laminating fabric for side curtain airbags with a toughness of 100 N or more as measured by German Industrial Standard DIN 53356. The method according to claim 1,
Laminating fabric for side curtain airbags with a material strength of 800 N or greater, measured by the American Society for Testing and Materials ASTM D 5822 method. Weaving the fabric;
Refining said woven fabric;
Opening and polishing the refined fabric; And
Forming a first laminating layer comprising an adhesive polymer film on a surface of the heat-set fabric, and then forming a second laminating layer comprising a gas-impermeable polymer film on the surface of the first laminating layer;
Lt; / RTI >
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 And at least one selected from the group consisting of
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. 13. The method of claim 12,
Wherein the fabric weaving step is to weave the top and bottom fabric layers simultaneously woven with an OPW (One Piece Woven) method. 13. The method of claim 12,
Wherein the forming of the first and second laminating layers is performed by a roll calendering method, a flat bed calendering method, a transfer calendering method, or a flame laminating method. 13. The method of claim 12,
Further comprising the step of forming a binder layer comprising a thermally crosslinkable material between the thermally fixed fabric surface and the first laminating layer. 16. The method of claim 15,
Wherein the thermally crosslinkable material is at least one selected from the group consisting of a polyurethane polymer, an acrylic polymer, and a vinyl acetate polymer. 13. The method of claim 12,
Further comprising performing a corona pre-treatment, plasma pre-treatment, flame pretreatment, or HF gas injection pre-treatment process on the surface of the fabric before forming the first laminating layer. An airbag for a vehicle comprising an airbag cushion made of a laminating fabric for a side curtain airbag according to any one of claims 1 to 11. 19. The method of claim 18,
Wherein the airbag has an internal pressure variation ratio (Q) measured according to the following formula (1) when the cushion is deployed is 10 or more to 100 or less.
[Equation 1]
Q = [internal pressure (A2) after 12 seconds / internal pressure (A1) after 6 seconds) 占 100
Wherein,
A1 is the internal pressure measurement value (KPa) after 6 seconds when the air bag cushion is deployed by instantaneously injecting the nitrogen compressed gas of 25 bar into the air,
A2 is the internal pressure measurement value (KPa) after 12 seconds when the air bag cushion is deployed by momentarily injecting 25 bar of compressed gas with air.

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