KR20020043729A - A side curtain typed airbag, and a process of preparing for the same - Google Patents

Abstract

PURPOSE: Textile for a side curtain type air bag which is characterized by protecting a passenger from side windows and apparatus of a car effectively because a swollen state is maintained for at least 5seconds without a special sewing process or a special sealing process, and a manufacturing method thereof are provided. CONSTITUTION: The textile for the side curtain type air bag is obtained by a process containing the steps of: using textile(1) woven out of thermoplastic multi-filament and coated with rubber; coating one in an upper textile and a lower textile of the air bag partially with adhesive(2); and then compressing and curing the one and the other. The adhesive is cold hardening type silicone resin or thermosetting type silicone resin. On the air bag, air exhaust quantity per unit length is under 0.8L/min·cm.

Description

A side curtain typed airbag, and a process of preparing for the same}

The present invention relates to an airbag (hereinafter referred to as "side curtain type airbag") and a method of manufacturing the same, which are installed in the vehicle side windshield or side structure for the purpose of preventing the occupant from colliding with the vehicle side windshield or structure when the vehicle is overturned. .

In general, the airbag is manufactured by cutting and sewing a fabric uniformly coated with rubber components such as xylocon rubber and chloroprene rubber. Conventional airbags installed on the front of a car must be inflated quickly by explosive gas in the event of a car crash and then discharged in the airbag within a short time, minimizing the secondary impact of the occupants by the airbag and ensuring the driver's vision. Could also be secured. To this end, most of the conventional airbags installed on the front of the vehicle are provided with holes for discharging air.

However, since the side curtain type airbag protects the passenger's head from the side windshield or the side structure of the vehicle when the vehicle rolls over or rolls, the side curtain type airbag continues to inflate for at least 5 seconds when the vehicle is rolled over. Your head should be given safely. To this end, gas should not leak more than necessary from the sewing portion and fabric of the airbag. Therefore, in general, the air curtain of the side curtain type air bag is not formed.

As described above, in order to prevent the gas in the airbag from being discharged too much into the sewing portion, US Patent No. 5,685,347 proposes a method of simultaneously weaving the upper and lower surfaces of the airbag on a jacquard loom. However, the method requires a jacquard loom with expensive electronic equipment attached thereto, and a pattern input for weaving preparation is very difficult. In addition, the method has a problem that can not be used as a fabric for the airbag when the defect occurs even once weaving.

In addition, Japanese Patent Application Laid-Open Nos. Hei 4-81342, 4-197848, 3-10946, etc., sewn rubber-coated fabrics to produce air bags, and there is no discharge of gas in the air bags through the gaps in the sewing areas. It is proposed a sealing process that prevents the sewing area with a tape or the like to prevent. However, the method has a problem in that the process is complicated and the manufacturing cost is increased because a separate sealing process is added.

In the case of the conventional side curtain type airbag, the air discharge amount per unit length of the sewing part is about 0.8L / min.cm (measured by 2.5KPa pressure) and the inflated state of the airbag cannot be maintained for more than 5 seconds in the event of vehicle overturning. . As a result, the occupants could not be secured.

It is an object of the present invention to provide a method for manufacturing a side curtain type airbag having an air discharge rate of less than 0.8 L / min · cm per unit length of a joint in order to solve the conventional problems.

The present invention can produce a side curtain type airbag without a separate sewing process, the airbag is inflated after the airbag is inflated and the gas in the airbag is gradually discharged to keep the airbag inflated for at least 5 seconds or more during the accident, Another object of the present invention is to provide a method of manufacturing a side curtain type airbag that can prevent a collision.

1 is a front view of an airbag manufactured by the present invention.

Figure 2 is a cross-sectional view of the airbag produced by the present invention.

※ Explanation of main parts in drawings

1: Fabric part for rubber coated airbag 2: Coated adhesive

A: Top surface of air bag B: Bottom surface of air bag

The method of manufacturing the side curtain type airbag of the present invention for achieving the above object is to form the upper or lower surface of the airbag in the manufacture of the side curtain type airbag by using a fabric for airbag woven with thermoplastic multifilament and coated with rubber It is characterized in that the adhesive is applied to a portion of the fabric for one air bag, and then pressed and cured with the other fabric for the air bag, the adhesive is not applied.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

First, the present invention manufactures a side curtain type airbag using an airbag fabric 1 having a rubber component coated on a fabric woven with thermoplastic multifilament. In this case, a polyamide fabric, a polyester fabric, etc. may be used as the fabric, but more preferably, a polyamide fabric having a weft yarn fineness of 210 to 420 denier is used. Since the side curtain type airbag is installed on the side of the vehicle, the volume of the thermoplastic multifilament constituting the fabric is preferably 210 to 420 denier since the volume should be smaller than that of the conventional airbag.

As the rubber component coated on the fabric, chloroprene rubber, silicone rubber, urethane rubber, or the like is used. At this time, the rubber component coating amount per unit area is preferably 30g / ㎡ or more. If the amount of the rubber coating per unit area is less than 30g / ㎡ the air bag inflated while the air bag is inflated to the fabric surface problem occurs that the air bag does not function properly.

The present invention applies the adhesive to one side of the fabric for airbags described above, that is, one portion of the fabric for airbags (parts requiring sewing) which forms the upper or lower surface of the airbag. In this case, it is most preferable to adopt a screen printing method as a method of applying the adhesive. As the adhesive, a room temperature curing silicone resin or a thermosetting silicone resin is used, and an adhesive coating amount per unit area of 50 g / m 2 to 100 g / m 2 is advantageous for shortening the curing time and saving the adhesive.

Next, the airbag fabric coated with the adhesive is pressed with the other airbag fabric not coated with the adhesive, and then cured and cut with a laser to manufacture a side curtain type airbag. In addition, the present invention may be first cut with a laser or the like before the compression / hardening, and then compressed / hardened to produce an air bag.

The present invention may optionally sew the junction again to reinforce the junction of the upper and lower surfaces of the airbag. In this case, even without sealing the sewing portion, the air emissions do not increase significantly. Side curtain type airbag manufactured by the present invention has a cross-sectional shape as shown in FIG.

According to the present invention, the upper and lower surfaces of the airbag are adhered without a separate sewing process by an adhesive applied to the fabric for airbags constituting the upper or lower surface of the airbag. As a result, no additional sealing process is required for the sewing area, which simplifies the process.

In the side curtain type airbag manufactured according to the present invention, the air discharge amount per unit length of the airbag upper and lower surface joining portions is less than 0.8L / min · cm when measured at a pressure of 2.5KPa. Due to such low air emissions, the side curtain type airbag manufactured according to the present invention can be kept in an inflated state for at least 5 seconds when an accident such as a vehicle overturns, thereby protecting the occupant safely.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the present invention is not limited only to the following examples.

Example 1

Side curtain type airbag by coating silicone rubber (coating amount 35g / ㎡) using coating knife on a fabric made of polyamide 66 yarn having 210 denier as the weft yarn fineness. Manufacture fabrics for dragons. Next, the room temperature curable silicone resin is applied using a screen 36T and a rubber blade on which an adhesive portion is designed to a portion of the fabric (parts requiring bonding) that forms the bottom surface of the airbag among the fabrics for the airbag (coating amount: 70 g / m 2) do. Subsequently, the airbag lower surface fabric coated with a portion of the room temperature-curable silicone resin and the airbag upper surface fabric not coated with the adhesive are pressed and then cured at room temperature for 1 hour. Subsequently, it is cut with a laser cutting machine to manufacture side curtain type airbags. The air discharge amount per unit length of the joint portion of the manufactured side curtain type airbag was measured at 2.5 KPa, and the result was 0.06 L / min · cm.

Example 2

Side curtain type airbag by coating silicone rubber (coating amount 35g / ㎡) using coating knife on a fabric made of polyamide 66 yarn with a weft fineness of 315 denier (density: 60 bones / inch x 60 bones / inch) Manufacture fabrics for dragons. Next, the thermosetting silicone resin is applied to the portion of the fabric (parts requiring bonding) of the fabric for the airbag by using a screen 36T and a rubber blade on which an adhesive portion is designed (coating amount: 60 g / m 2). do. Subsequently, the fabric for the airbag bottom surface and the airbag top surface without the adhesive applied to the portion of the thermosetting silicone resin were pressed at 190 ° C. for 30 seconds using a heat press and then cured at room temperature for 1 hour. Subsequently, it is cut with a laser cutting machine to manufacture side curtain type airbags. The air discharge amount per unit length of the joint portion of the manufactured side curtain type airbag was measured at 2.5 KPa, and the result was 0.08 L / min · cm.

Example 3

Side curtain type airbag by coating silicone rubber (coating amount 35g / ㎡) using coating knife on a fabric made of polyamide 66 yarn with a weft weft fineness of 420 denier (density: 49 bones / inch × 49 bones / inch) Manufacture fabrics for dragons. Next, a thermosetting silicone is manufactured by using a rubber blade and a screen 40T, which manufactures the fabric for the airbag with a laser cutting machine, and which has an adhesive portion designed on a portion of the fabric (parts requiring bonding) that forms the bottom surface of the airbag. The resin is applied (coating amount: 50 g / m 2). Subsequently, the fabric for airbag lower surface fabric coated with a part of thermosetting silicone resin and the upper surface of airbag surface without adhesive is pressed at 190 ° C. for 20 seconds using a heat press, and then cured at room temperature for 1 hour. Manufacture airbags. The junction of the airbag thus prepared is again sewn with a sewing machine. As a result of measuring the air discharge amount per unit length of the side curtain type airbag manufactured at 2.5KPa, 0.17 L / min.cm.

Example 4

Side curtain type airbag by coating silicone rubber (coating amount 35g / ㎡) using coating knife on a fabric made of polyamide 66 yarn with a weft weft fineness of 420 denier (density: 49 bones / inch × 49 bones / inch) Manufacture fabrics for dragons. Next, the air bag fabric is cut by a laser cutting machine, and the room temperature-curable silicone is formed by using a rubber blade and a screen (40T) in which an adhesive part is designed on a part of the fabric (parts requiring bonding) that forms the bottom surface of the air bag. The resin is applied (coating amount: 50 g / m 2). Subsequently, the fabric for airbag lower surface fabric coated with a portion of the room temperature-curable silicone resin and the fabric for the upper surface of the airbag not coated with adhesive are pressed and cured at room temperature for 1 hour to produce a side curtain type airbag. The junction of the airbag thus prepared is again sewn with a sewing machine. The air discharge amount per unit length of the joint portion of the manufactured side curtain type airbag was measured at 2.5 KPa, and the result was 0.05 L / min · cm.

Comparative Example 1

Silicone rubber is coated on the whole fabric surface with a coating amount of 35g / m2 using a conventional coating knife on a fabric composed of polyamide 66 yarn having a 210-denier weft fineness. Coating uniformly to manufacture a fabric for the side curtain type airbag. Next, the airbag fabric is cut and sewn to prepare a side curtain type airbag. As a result of measuring the air discharge amount per unit length of the prepared sewing part of the airbag at 2.5 KPa pressure, the result was 0.86 L / min · cm.

Comparative Example 2

Silicone rubber is coated with 30g / m² on the whole fabric surface using conventional coating knives on a fabric composed of polyamide 66 yarn with a weft fineness of 315 denier (density: 60 bones / inch x 60 bones / inch). Coating uniformly to manufacture a fabric for the side curtain type airbag. Next, the airbag fabric is cut and sewn to prepare a side curtain type airbag. As a result of measuring the air discharge amount per unit length of the sewing part of the manufactured air bag at 2.5 KPa pressure, the result was 0.88 L / min · cm.

The present invention maintains an inflated state for at least 5 seconds after inflation without a separate sewing process or sealing process to manufacture a side curtain type airbag that can effectively protect the occupants from the side windows and mechanisms of the vehicle when the vehicle rolls over or rolls. can do.

Claims (4)

In manufacturing a side curtain type airbag using an airbag fabric woven with thermoplastic multifilament and coated with rubber, an adhesive is applied to a part of the airbag fabric forming the upper or lower surface of the airbag, and then the adhesive is applied. Method for producing a side curtain type airbag, characterized in that the other airbag fabric not pressed and hardened. The method according to claim 1, wherein the adhesive is a room temperature curing silicone resin or a thermosetting silicone resin. The method of manufacturing a side curtain type airbag according to claim 1, wherein an adhesive is applied on the fabric for the airbag by screen printing. A side curtain type airbag in which part of the upper and lower surfaces of the airbag are joined to each other, wherein the air discharge amount (measured at 2.5 KPa pressure) per unit length of the portion where the upper and lower surfaces of the airbag are joined is less than 0.8 L / min.cm. Side curtain type airbag.