KR100447501B1 - A side curtain typed airbag, and a process of preparing for the same - Google Patents

Abstract

The present invention relates to a side curtain type airbag and a method of manufacturing the same to prevent the occupant from being injured by the vehicle side windshield or structure during side collision or rollover of the vehicle. In the side curtain type airbag of the present invention, the upper and lower surfaces of the airbag made of thermoplastic multifilament are joined by sewing, and an adhesive film having a thickness of 5 to 100 μm is laminated on one or both surfaces of the airbag, 2.5 Air discharge amount per unit length of the sewing part measured by KPa pressure is characterized in that less than 0.8L / min · cm. The air curtain of the side curtain type manufactured by the present invention can protect the occupant safely even when the vehicle is overturned due to the slow air discharge rate.

Description

Side curtain type airbag and its manufacturing method {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 that are installed on the vehicle side structure for the purpose of preventing the occupant from colliding with the vehicle side windshield or the structure when the vehicle is overturned.

In general, air bags are manufactured by cutting and sewing a fabric coated with rubber components such as silicone rubber and chloroprene rubber uniformly. 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 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 safe. To this end, gas should not leak more than necessary from the sewing portion and fabric of the airbag. Therefore, in general, air vent holes are not formed in the side curtain type airbags.

In order to prevent too much gas in the airbags from being sewn, US Pat. 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 airbag manufactured by the above method has a problem in that the fabric bonding site is weak and the airbag is inflated when the airbag is inflated so that air leaks and the strength of the fabric bonding site is weak.

In addition, Japanese Patent Application Laid-Open Nos. Hei 4-81342, 4-197848, 3-10946, etc., sew a chloroprene rubber-coated fabric to manufacture an airbag, and then discharge the gas in the airbag through a gap in the sewing portion. In order to prevent this, a sealing process for sealing the sewing part with a tape or the like has been proposed. 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.

On the other hand, a method of manufacturing an airbag by sewing a fabric for airbags having high tear strength by coating with silocon rubber is not proposed, but in this case, the side curtain has a large amount of air discharged per unit length of the sewing portion. Not suitable as a type airbag.

In the case of the conventional side curtain type airbags described above, the air discharge amount per unit length of the sewing area measured at 2.5KPa pressure is about 0.9L / min.cm or more, so that the inflated state of the airbag may be maintained for 5 seconds or more in case of an accident such as vehicle overturning. Can't. As a result, the occupants could not be secured.

SUMMARY OF THE INVENTION An object of the present invention is to provide a simple process and low cost manufacturing method for a side curtain type airbag in which air emissions per unit length of all parts including a sewing portion are less than 0.8L / min · cm to solve the conventional problems. It is to. Another object of the present invention is to provide a side curtain type airbag that can protect the occupant safely by maintaining the inflated state in the event of an accident such as vehicle overturning for 5 seconds low air emissions per unit length of all parts including the sewing part will be.

1 is a schematic plan view of an airbag of the present invention

(A)-(c) is sectional drawing of the AA 'part in FIG.

※ Explanation of main parts in drawings

1: air bag with adhesive film lined up 2: sewing thread

3: airbag fabric 4: adhesive film 5: silicone rubber

The side curtain type airbag of the present invention for achieving the above problems is the upper surface and the lower surface of the airbag composed of thermoplastic multifilament is coupled by sewing, the adhesive for adhesive thickness of 5 ~ 100㎛ on one or both sides of the airbag The film is laminated, and the air discharge amount per unit length of the sewing part measured at 2.5 KPa pressure is less than 0.8L / min.cm.

In addition, the manufacturing method of the side curtain type airbag of the present invention in the manufacture of a side curtain type airbag made of an airbag fabric woven with thermoplastic multifilament, the airbag fabric is sewn in the form of an airbag first, and then one side of the airbag It is characterized by laminating an adhesive film having a thickness of 5 ~ 100㎛ on both sides.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a plan view schematically illustrating the airbag of the present invention, and FIGS. 2 (a) to 2 (c) are cross-sectional views taken along line AA ′ in FIG. 1.

In the present invention, a fabric woven from thermoplastic multifilament (hereinafter referred to as "fabric for airbag") is first sewn in the form of a side curtain type airbag. Before sewing, the rubber component may be coated on the fabric for airbag and then sewn. In this case, silicone rubber, chloroprene rubber or urethane rubber may be used as the rubber component. FIGS. 2 (a) and 2 (c) show an air bag not coated with the rubber component 5 on the fabric 3 for air bag prior to sewing. 2 (b) is a cross-sectional view of the airbag in which the rubber component 5 is coated on the airbag fabric 3 before sewing.

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 of the side curtain type airbag should be smaller than that of the conventional airbag. As the thermoplastic multifilament, polyamide-based synthetic fibers are mainly used.

Next, the adhesive film having a thickness of 5 to 100 μm is laminated on any one or both surfaces of the top and bottom surfaces of the sewn side curtain type airbag, and dried and cured to manufacture the side curtain type airbag of the present invention. The adhesive film uses a film made of one resin selected from the group consisting of a polyurethane resin, a polyether resin, a polypropylene resin, a fibrous clock resin, a polyamide resin, and copolymerized resins thereof.

When the thickness of the adhesive film is less than 5 µm, the air discharge amount of the air bag increases, and when the thickness of the adhesive film exceeds 100 µm, the folding property in the module decreases. It is more preferable to laminate the adhesive film on both sides than to laminate on one side of the airbag.

The present invention is characterized in that the airbag fabric is sewn first, and then the adhesive film is laminated on any one or both of the upper and lower surfaces of the airbag.

The present invention can achieve the effect of simultaneously performing the conventional rubber component coating process and the sealing process by laminating the adhesive film on the front surface of the airbag including the sewing portion. As a result, the manufacturing method of the present invention is simplified and the manufacturing cost is low.

In the side curtain type airbag manufactured by the present invention, the adhesive film is also laminated on the sewing portion, and the air discharge amount per unit length of the entire airbag portion is less than 0.8 L / min · cm when measured at a pressure of 2.5 KPa. Due to the low amount of air discharge, the side curtain type airbag manufactured by the present invention can be kept in an inflated state for at least 5 seconds in case of an accident such as vehicle overturning, thereby protecting the occupant safely.

In the present invention, the amount of air discharged per unit length of the sewing portion is measured by a measuring device equipped with a regulator, a flow meter, and a pressure gauge for adjusting the air pressure.

The specific test method (Leak Test) is to inject air of 2.5KPa pressure into the air bag to inflate the air bag completely, and then measure the total amount of air exiting the air bag per unit time (1 minute) in liter (ℓ) unit By dividing this by the total sewing length (cm) of the air bag, the air discharge amount per unit length of the sewing part is obtained. In this case, it is assumed that there is no air amount leaking into the airbag fabric instead of the sewing part (0ℓ).

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

Weaving plain weave fabric using 210 denier polyamide 66 multifilament as warp and weft yarn, refining and heat-setting by conventional method, and then coating 20g / ㎡ silicone rubber per unit area A fabric for airbags of 72 bones / inch was prepared. The airbag fabric was sewn to prepare a side curtain type airbag. A polyether-based adhesive film having a thickness of 30 μm was continuously laminated on each of the top and bottom surfaces of the sewn side curtain type airbag, followed by drying and curing to prepare a side curtain type airbag. As a result of measuring the air discharge amount per unit length of the prepared side curtain type airbag and the unsealed portion at 2.5 KPa pressure, all were 0.37 L / min.cm.

Example 2

Weaving plain fabric using 315 denier polyamide 66 multifilament as warp and weft yarn, and refining and heat-setting by conventional method to fabricate non-coated airbag fabric with fabric density of 60 / inch × 60 / inch Prepared. The airbag fabric was sewn to prepare a side curtain type airbag. A side curtain type airbag was manufactured by continuously laminating a polyurethane-based adhesive film having a thickness of 40 μm on each of the top and bottom surfaces of the sewn side curtain type airbag, followed by drying and curing. As a result of measuring the air discharge amount per unit length of the sewing part and the unsealed part of the manufactured side curtain type airbag at 2.5 KPa pressure, all were 0.51 L / min.cm.

Comparative Example 1

Weaving plain fabric using 210 denier polyamide 66 multifilament as warp and weft yarn, smelting and heat-setting by the usual method, and then applying silicone rubber (coating amount 35g / ㎡) on the coating knife A 70-inch / inch × 70-bone / inch fabric for airbags was prepared. After cutting the upper and lower surfaces of the side curtain type airbag with the fabric for the airbag, respectively, the side curtain type airbag was manufactured by sewing them. As a result of measuring the air discharge amount per unit length of the sewing part of the manufactured side curtain type airbag at 2.5 KPa pressure, all were 0.86 L / min * cm.

Comparative Example 2

Weaving plain fabric using 315 denier polyamide 66 multifilament as warp and weft yarn, smelting and heat-setting by the usual method, and then applying silicone rubber (coated amount 30g / m²) on it Fabrics for airbags of 60 bones / inch x 60 bones / inch were prepared. After cutting the upper and lower surfaces of the side curtain type airbag with the fabric for the airbag, respectively, the side curtain type airbag was manufactured by sewing them. As a result of measuring the air discharge amount per unit length of the sewing part of the manufactured side curtain type airbag by 2.5 KPa pressure, all were 0.88 L / min * cm.

Comparative Example 3

Weaving plain fabric using 420 denier polyamide 66 multifilament as warp and weft yarn, smelting and heat-setting by the usual method, and then applying silicone rubber (coating amount 35g / ㎡) on coating knife Fabrics for airbags of 49 bones / inch x 49 bones / inch were prepared. After cutting the upper and lower surfaces of the side curtain type airbag with the fabric for the airbag, respectively, the side curtain type airbag was manufactured by sewing them. As a result of measuring the air discharge amount per unit length of the sewing part of the manufactured side curtain type airbag at 2.5 KPa pressure, all were 0.93 L / min * cm.

Since the side curtain type airbag of the present invention can maintain an inflated state for at least 5 seconds after inflation, it is very useful as an airbag installed in the vehicle side windshield or side structure to protect the occupant when the vehicle is overturned or rolled. The manufacturing method of the present invention does not need to use a complicated jacquard loom, and can omit a separate sealing process for the sewing part, so that the process is simple and the manufacturing cost is low.

Claims (5)

In manufacturing a side curtain type airbag with an airbag fabric woven from thermoplastic multifilament, the airbag fabric is sewn in the form of an airbag first, and then an adhesive having a thickness of 5 to 100 μm on one or both sides of the airbag is sewn. A method for producing a side curtain type airbag, comprising laminating a film. The method of claim 1, wherein the adhesive film is composed of one resin selected from the group consisting of polyurethane resins, polyether resins, polypropylene resins, fibrous clock resins, polyamide resins and copolymerized resins thereof. A method of manufacturing a side curtain type airbag, characterized in that. The method for producing a side curtain type airbag according to claim 1, wherein the fineness of the thermoplastic multifilament is 210 to 630 denier. The upper and lower surfaces of the airbag made of thermoplastic multifilament are joined by sewing, and an adhesive film having a thickness of 5 to 100 μm is laminated on one or both surfaces of the airbag, and the sewing portion measured at 2.5 KPa pressure Side curtain type airbag, characterized in that the air discharge amount per unit length is less than 0.8L / min.cm. The method according to claim 4, wherein the adhesive film is composed of one resin selected from the group consisting of polyurethane resins, polyether resins, polypropylene resins, fibrous clock resins, polyamide resins and copolymerized resins thereof. A side curtain type airbag characterized by the above.