KR20180036303A - Side Curtain Airbag - Google Patents

Abstract

The present invention provides a side curtain airbag. Even though the side curtain airbag is manufactured in a cut and sew method, the side curtain airbag has parts and pressure resistance which are second only to those of one manufactured in one-piece woven (OPW) method. Also, the side curtain airbag can be manufactured at a high productivity since a manufacturing process thereof is easier than a seam sealing method. The side curtain airbag of the present invention comprises: an inflating part; a perimeter non-inflating part surrounding the inflating part; a perimeter seam part between the inflating part and the perimeter non-inflating part; and a first sealing tape attached to the perimeter seam part.

Description

{Side Curtain Airbag}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a side curtain airbag, and more particularly, to a side curtain airbag having a component and a pressure resistance comparable to those manufactured by a one-piece weft (OPW) The present invention relates to a side curtain airbag which can be manufactured with high productivity because the manufacturing process is facilitated as compared with a seam sealing method.

When the impact sensor senses an impact applied to the vehicle in the event of collision or rollover of a vehicle running at a speed higher than a predetermined speed, the airbag is inflated and expanded by the high temperature and high pressure air supplied from the inflator, do.

Side curtain airbags, which must remain inflated for a relatively long period of time in order to protect passengers during roll-over, are generally manufactured by i) cutting and sewing the fabric, ii) by a seam sealing method of treating the seam formed by the cutting and sewing method with a sealant (for example, a silicone-based sealant), or iii) (One Piece Woven: OPW) method which forms an expansion part of a bilayer structure.

Cutting and sewing is advantageous in that the manufacturing cost is relatively low, the design is flexible, the weight of the final airbag is low and the weight of the vehicle is advantageous, while the needle holes are formed during the sewing process There is a problem that the leakage of air from the joint is relatively severe and the component and pressure resistance are weak.

The one-piece weaving method is advantageous in that the manufacturing process is relatively simple since the joining portion is formed in the weaving step without a separate sewing process. On the other hand, a special facility such as Jacquard is required, A relatively high weaving density and a relatively large amount of resin coating are required in order to improve the component property and the pressure resistance, which is not only disadvantageous in weight reduction but also has a problem of high manufacturing cost.

Meanwhile, the seam sealing method is to overcome the disadvantages (low component and pressure resistance) of the above-described cutting and sewing method while applying the sealant to the joint region in advance before performing the sewing process And it is required to cure it, so that the manufacturing process is relatively complicated. Particularly, the seal sealing method is very disadvantageous from the viewpoint of productivity, since sealant must exhibit stable adhesion, sealant uniformity must be ensured to maintain durability, and severe curing conditions must be satisfied.

Accordingly, the present invention relates to a side curtain airbag capable of satisfying the above-mentioned needs in the related art.

One aspect of the present invention is that although it is manufactured by a cutting and sewing method, it has component and pressure resistance comparable to those manufactured by a one-piece weft (OPW) method and is superior to a seam sealing method And it is an object of the present invention to provide a side curtain airbag which is easy to manufacture and can be manufactured with high productivity.

Other features and advantages of the invention will be set forth in the description which follows, or may be learned by those skilled in the art from the description.

According to one aspect of the present invention as described above, an inflating part; A perimeter non-inflating part surrounding the bulge; A perimeter seam part between the expansion part and the peripheral unexpanded part; And a first sealing tape attached to the peripheral joint, wherein the first sealing tape is attached to the peripheral joint.

The first sealing tape may be attached to the peripheral joint within the bulge.

Wherein the first sealing tape comprises: an adhesive layer directly contacting the peripheral joint; And a barrier layer on the adhesive layer.

The adhesive layer may include a polyolefin resin, a polyurethane resin, or a silicone resin having a melting point of 150 DEG C or less.

The barrier layer may be a woven fabric or a knitted fabric including a yarn formed of a material having a melting point higher by 50 DEG C or higher than the melting point of the adhesive layer.

The barrier layer may be a plain-woven fabric or a tricot knit fabric.

The side curtain airbag of the present invention comprises an island non-inflating part surrounded by the inflation part; An island non-inflating part between said inflation section and said island non-inflation section; And a second sealing tape attached to the island joint.

The second sealing tape may be attached to the island junction outside the bulge.

The second sealing tape comprising: an adhesive layer directly contacting the island joint; And a barrier layer on the adhesive layer.

The adhesive layer may include a polyolefin resin, a polyurethane resin, or a silicone resin having a melting point of 150 DEG C or less.

The barrier layer may be a fabric or a knitted fabric including a yarn formed of a material having a melting point higher than the melting point of the adhesive layer by 50 DEG C or more.

The barrier layer may be a flat fabric or a tricot knitted fabric.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are intended to provide further explanation of the invention as claimed.

The side curtain airbag according to the present invention is basically manufactured by a cutting and sewing method so that its unique advantages are that i) the manufacturing cost is relatively low, ii) the design is free to be implemented, iii) (Jacquard), and iv) the weight of the final airbag product is low, which is advantageous for vehicle weight reduction.

Further, the side curtain airbag of the present invention has parts and pressure resistance comparable to those produced by the one-piece weft (OPW) method, although it is manufactured by cutting and sewing.

In addition, the side curtain airbag of the present invention can be manufactured with high productivity through an easy process as compared with a seam sealing method.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
1 is a plan view of a side curtain airbag according to an embodiment of the present invention,
2 is a cross-sectional view of a first sealing tape according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the embodiments described below are provided for illustrative purposes only, and do not limit the scope of the present invention.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Therefore, the present invention encompasses all changes and modifications that come within the scope of the invention as defined in the appended claims and equivalents thereof.

Hereinafter, a side curtain airbag 100 according to an embodiment of the present invention will be described with reference to FIG.

1, the side curtain airbag 100 of the present invention includes an inflating part 110 that can be inflated by air provided from an inflator (not shown) A surrounding perimeter non-inflating part 121, and an island non-inflating part 122 surrounded by the expansion part.

There is a perimeter seam part 131 connecting between the expansion part 110 and the peripheral unexpanded part 121. The peripheral part between the expansion part 110 and the island non- There is an island seam part 132 connecting them.

The expansion portion 110, the peripheral unexpanded portion 121, the island non-expanding portion 122, the peripheral joint portion 131, and the island joint portion 132 are formed by overlapping two fabrics, Followed by a sewing step.

The fabric may comprise a fabric comprising warp and weft of polyamide 66 (PA 66) or polyethylene terephthalate (PET) yarns having a total fineness of 420 to 500 denier and a coating on at least one side of the fabric. When a coating layer exists only on one side of the fabric, the coating layer is located on the inner side of the expansion part 110.

The warp density and weft density of the fabric may be 40 to 54 th / inch, respectively.

The coating layer is for improving the edge comb resistance of the joints 131 and 132 and improving the component and pressure resistance of the side curtain airbag 100. The coating layer may be formed of a polyurethane resin, a polyolefin resin, an acrylic resin, And a silicone resin.

In consideration of adhesion with the sealing tapes 140 and 50 of the present invention described below, it is preferable that the coating layer includes a polyurethane resin.

The peripheral joint portion 131 and the island joint portion 132 may be formed by sewing the fabrics with stitches of 30 to 100 stitch / 100 mm using at least one of nylon yarn, polyester yarn, and p-aramid yarn have.

According to the present invention, the first sealing tape 140 is attached to the peripheral joint portion 131 in order to prevent air from leaking through the needle hole generated when the peripheral joint portion 131 is formed through the sewing process do.

When the first sealing tape 140 is attached to the peripheral joint portion 131 from the outside of the expansion portion 110, much stress is applied to the peripheral joint portion 131, thereby increasing air leakage.

According to an embodiment of the present invention, the first sealing tape 140 may be attached to the peripheral joint part 131 inside the expansion part 110 so that the first sealing tape 140 may be pulled out The airtightness of the side curtain airbag 100 can be further improved by directly blocking the air to be discharged.

The first sealing tape 140 of the present invention may be attached to the peripheral joint portion 131 inside the expansion portion 110 through a simple method of heat bonding.

The first sealing tape 140 of the present invention may be composed of at least two layers. For example, as illustrated in FIG. 2, the first sealing tape 140 includes an adhesive layer 141 that directly contacts the peripheral joint 131, and a barrier layer 142 on the adhesive layer 141 ).

In order to allow the first sealing tape 140 of the present invention to be attached to the peripheral joint portion 131 through a simple method of heat bonding, the adhesive layer 141 is formed of a polyolefin resin having a melting point of 150 ° C or less, a polyurethane Resin, or silicone resin.

Meanwhile, the barrier layer 142 may be a woven fabric or a knitted fabric. More specifically, the barrier layer 142 may be a plain-woven fabric or a tricot knit fabric.

Since the barrier layer 142 should not melt together with the adhesive layer 141 during the thermal bonding process of the first sealing tape 140, the adhesive layer 141 may be formed of any material, Of a material having a melting point higher by 50 占 폚 or more than the melting point of the yarn.

As illustrated in FIG. 1, the site curtain airbag 100 according to an embodiment of the present invention may further include a second sealing tape 150 attached to the island joint 132.

It is impossible to attach the second sealing tape 150 inside the expansion part 110 because of the process characteristic of the island joint part 132. Therefore, May be attached to the island joint 132. According to one embodiment of the present invention, by attaching the second sealing tape 150 to the island joint 132 at both the front and back sides of the side curtain airbag 100, air leakage through the island joint 132 is maximized .

According to an embodiment of the present invention, the second sealing tape 150 may be attached to the island joint 132 through a thermal bonding method. Accordingly, the second sealing tape 150 can be manufactured in the same manner as the first sealing tape 140.

That is, the second sealing tape 150 according to an embodiment of the present invention includes a bonding layer directly contacting the island bonding portion 132 and a barrier layer on the bonding layer, wherein the bonding layer is formed of a polyolefin having a melting point of 150 캜 or less (For example, a flat cloth) or a knitted fabric (for example, a flat cloth) including a yarn formed of a material having a melting point higher than the melting point of the adhesive layer by at least 50 캜, a resin, a polyurethane resin or a silicone resin For example, tricot knit).

Hereinafter, the effects of the present invention will be described with reference to specific examples and comparative examples of the present invention. It should be understood, however, that the following examples are for the purpose of promoting understanding of the present invention and are not intended to limit the scope of the present invention.

Example  One

Using a PET yarn having a total fineness of 420 denier, fabric having a light / weft density of 46 x 46 th / inch was fabricated, and one side of the fabric was coated with polyurethane resin to complete the fabric for airbags. The fabric for the airbag was then cut with a laser according to the shape of the side curtain airbag cushion. The in-board panel and the out-board panel thus obtained were overlapped so that the coated surfaces were opposed to each other, and then the sewing process was performed with 80 stitch / 100 mm stitching water. At this time, a sealing tape of a two-layer structure was thermally adhered along the peripheral joint portion in the expansion portion under hot air at 150 캜. The side curtain airbag was completed by thermally adhering the sealing tape along the island joint at the outside of the expansion portion under hot air at 150 캜.

Comparative Example  One

A side curtain airbag was completed in the same manner as in Example 1, except that no sealing tape was attached to the joint portion.

Comparative Example  2

The side curtain airbag was completed in the same manner as in Example 1, except that the step of coating one side of the fabric with polyurethane resin was omitted, the same sewing was performed with a ribbon, and the joint was not treated with a sealing tape.

Comparative Example  3

A side curtain airbag was completed in the same manner as in Example 1, except that one side of the fabric was coated with silicone resin, simultaneously sewed with a ribbon, and the joint was not treated with a sealing tape.

The internal pressure retention ratio after 6 seconds of the above-described Examples and Comparative Examples was measured by the following method, and the results are shown in Table 1 below.

After 6 seconds,

The internal pressure performance of the airbag was measured by the internal test standard. The pressure resistance performance evaluation device used in the test was a SUREFIRE airbag deployment system of MICROSYS, and the gas used in the pressure test was nitrogen (N ₂ ) gas. The inflation pressure condition was set up so that the initial maximum internal pressure of the cushion was 100 kpa in consideration of the cushion volume. The pressure change was measured in real time by the pressure sensor attached to the cushion. The internal pressure (kPa) was measured after 6 seconds in the pressure-time graph obtained in the experiment, and the internal pressure retention ratio was calculated from the initial peak to 6 seconds.

Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Initial pressure (kPa) 108 92 98 105 After 6 seconds internal pressure (kpa) 47 0 0 9 After 6 seconds, the internal pressure retention ratio (%) 43.5 0 0 8.6

100; Side curtain airbag 110: Expansion part
121: peripheral non-expanding part 122: island non-expanding part
131: peripheral joint 132: island joint
140: first sealing tape 141: adhesive layer
142: barrier layer 150: second sealing tape

Claims (8)

An inflating part;
A perimeter non-inflating part surrounding the bulge;
A perimeter seam part between the expansion part and the peripheral unexpanded part; And
And a first sealing tape attached to the peripheral joint.
Side curtain airbags. The method according to claim 1,
Characterized in that the first sealing tape is attached to the peripheral joint within the expansion portion.
Side curtain airbags. 3. The method of claim 2,
The first sealing tape
An adhesive layer directly contacting the peripheral joint; And
A barrier layer on said adhesive layer,
Wherein the adhesive layer comprises a polyolefin resin, a polyurethane resin, or a silicone resin having a melting point of 150 DEG C or less,
Characterized in that the barrier layer is a woven fabric or a knitted fabric comprising a yarn formed of a material having a melting point higher by 50 DEG C or higher than the melting point of the adhesive layer.
Side curtain airbags. The method of claim 3,
Characterized in that the barrier layer is a plain-woven fabric or a tricot knit fabric.
Side curtain airbags. The method according to claim 1,
An island non-inflating part surrounded by the bulge;
An island non-inflating part between said inflation section and said island non-inflation section; And
Further comprising a second sealing tape attached to the island junction.
Side curtain airbags. 6. The method of claim 5,
And the second sealing tape is attached to the island joint at the exterior of the bulge.
Side curtain airbags. The method according to claim 6,
Wherein the second sealing tape
An adhesive layer directly contacting the island joint; And
A barrier layer on said adhesive layer,
Wherein the adhesive layer comprises a polyolefin resin, a polyurethane resin, or a silicone resin having a melting point of 150 DEG C or less,
Wherein the barrier layer is a fabric or a knitted fabric comprising a yarn formed of a material having a melting point higher by 50 DEG C or higher than the melting point of the adhesive layer.
Side curtain airbags. 8. The method of claim 7,
Characterized in that the barrier layer is a flat fabric or a tricot knitted fabric.
Side curtain airbags.

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