KR102473618B1 - Multi-layer fabric - Google Patents

Abstract

The present invention relates to a multi-fabric and an airbag formed of the multi-fabric. The multi-fabric can provide an airbag capable of sufficiently protecting a driver or passengers by minimizing damage caused by fragments of broken glass when a vehicle rolls over.

Description

Multi-layer fabric {MULTI-LAYER FABRIC}

The present invention relates to multi-fabrics.

BACKGROUND OF THE INVENTION [0002] In recent years, there has been a demand for improvement in the safety of drivers and passengers in the event of a collision with a vehicle or other transportation means, and the installation rate of various airbags is increasing. An airbag is an airbag that rapidly deploys and inflates an airbag by injecting gas from an inflator into an inflatable bubble after a sensor detects an impact received during a frontal or side collision, and the cushioning properties of the inflated bubble ensure that the driver or passenger It means to protect the human body by mitigating the shock to be received.

BACKGROUND ART In the past, airbags have been mounted on the front side of a driver's seat, or a driver's seat and a front passenger seat, and are mainly used to protect the face and upper body of a passenger in a frontal collision of a vehicle. However, in recent years, curtain-type airbags capable of responding to collisions from the side or overturning of vehicles have also been developed.

This curtain-type airbag is designed to be housed in a region from the front pillar side to the rear pillar side along the roof rail of the side wall of the vehicle interior, and to inflate and deploy along the side window at the time of a collision. A curtain-type airbag should have excellent storage capacity (it should be able to be folded compactly), and since the distance between the passenger's head and the side glass is short, it is necessary to protect the head by momentarily squeezing between the passenger's head and the glass in the event of a side collision. The development speed is required to be fast. In addition, it is required to maintain a certain degree of internal pressure for a few seconds after the vehicle is deployed when the vehicle is overturned. However, it is very rare that the side glass is not broken when the vehicle rolls over, and the airbag is easily torn by the broken side glass fragments, making it difficult to protect passengers.

The present invention provides a multi-fabric that minimizes damage caused by broken glass fragments.

The present invention also provides an airbag formed of the multi-fabric.

Hereinafter, a multi-fabric fabric according to a specific embodiment of the present invention and an airbag formed therefrom will be described.

According to one embodiment of the invention, the expansion unit having a structure of two or more layers separated from each other; and a joint portion surrounding the expanded portion, wherein at least one layer of the expanded portion includes a first region formed of two or more types of tissues including 1/1 plain weave.

The multi-fabric is manufactured without a sewing part by an integral weaving method, and may be a one-piece woven having an expansion part having a structure of two or more layers separated from each other and a joint part surrounding the expansion part.

Multi-fabric has the property of being inflated by air and is used in vehicle airbags and life jackets. In particular, multi-fabric fabrics used in vehicle airbags need to remain inflated to protect the driver or passengers when the vehicle rolls over. However, there is a problem in that the multi-fabric fabric used in the airbag is torn by fragments of broken glass of the vehicle and does not sufficiently protect the driver or passengers.

The present invention was completed upon discovering that damage caused by broken glass fragments can be minimized while maintaining the excellent characteristics of a one-piece woven fabric by introducing a specific tissue pattern into such a multi-fabric fabric.

The expansion part of the multi-fabric has a structure of two or more layers separated from each other, and may have, for example, a two-layer structure, a three-layer structure, or a four-layer structure. In addition, the layer constituting the expansion part is a fabric, and may be referred to as a fabric layer in this specification.

Since the expansion part is closed by the connecting part surrounding it, when gas is supplied to the expansion part, the supplied gas can be confined and inflated.

The multi-fabric is a one-piece woven fabric manufactured by an integral weaving method, and the joint is a yarn (warp or weft) of one fabric layer constituting the expansion part and a yarn (weft or weft) of another fabric layer. It may refer to a group of tissue points (junction points) formed along the edge of the expansion part by intersecting slopes. More specifically, the joint is a group of tissue points formed along the edge of the expansion part by crossing the warp yarn of one fabric layer constituting the expansion part with the weft yarn of the other textile layer, or a group of tissue points constituting the expansion part. The warp yarns and the weft yarns may be a group of tissue points formed along the edge of the expansion part by crossing the weft yarns and the warp yarns of another fabric layer, respectively. If the multi-fabric includes an expanded portion having a structure of three or more layers separated from each other, the yarns of the outermost two fabric layers are crossed to form a tissue point along the edge of the expanded portion, thereby closing the expanded portion. Of course, a portion for introducing components required in the related art, such as an inlet for supplying gas to the expansion unit, may be manufactured in an unclosed state.

In this specification, the double fabric having a two-layer structure as the multi-fabric is described in detail, but this information can be applied to a multi-fabric having a structure of three or more layers as it is.

As shown in FIG. 1, the multi-fabric may be a double-fabric structure in which two fabric layers separated from each other and outer circumferences of the two fabric layers are joined by a joint.

In the multi-fabric fabric according to the embodiment, at least one layer constituting the expansion part may include a first region formed of two or more types of tissues including 1/1 plain weave.

Fabrics woven with 1/1 plain weave tend to have high tensile strength but low tear strength because the yarns are densely packed. In textiles, tear strength refers to the strength of force required when yarns constituting warp or weft yarns break. Ground yarns are pushed out by the force rather than broken. This yarn movement effect occurs more frequently in other tissues than in 1/1 plain weave, so fabrics woven with tissues other than 1/1 plain weave can show relatively higher tear strength than fabrics woven with 1/1 plain weave. . However, fabrics woven with structures other than 1/1 plain weave have very low tensile strength compared to 1/1 plain weave, making them unsuitable for use as airbag fabrics.

Accordingly, in the multi-fabric according to the embodiment, at least one layer constituting the expansion part is made of 1/1 plain weave so that it can exhibit excellent mechanical properties such as tensile strength without being easily torn by sharp objects such as broken glass fragments. It includes a first region formed of two or more types of tissues including.

In addition, the rest of the layer constituting the expansion part except for the first region may be composed of a second region formed of 1/1 plain weave.

As a result, the multi-woven fabric exhibits excellent tensile strength at the level of 1/1 plain weave fabric and significantly improved tear strength compared to 1/1 plain weave fabric, so it can be suitably used for curtain-type airbags stored in a position easily torn by glass fragments. have.

In particular, in the first region, tissues other than 1/1 plain weave are inserted every 2 to 15 1/1 plain weave, so that the multi-weave exhibits excellent tensile strength at the level of 1/1 plain weave fabric and is remarkably superior to 1/1 plain weave fabric. Improved tear strength can be realized.

More specifically, the first region includes 2 to 15, 2 to 13, 2 to 11, 3 to 15, 5 to 15, 3 to 13 1/1 plain weave structures other than the 1/1 plain weave. It may be woven in a pattern that is inserted every 5, 5 to 11, 2 to 5, 3 to 5 or about 5. The multi-fabric fabric including the first region can exhibit significantly improved tear strength compared to a general OPW fabric made of only 1/1 plain weave, and an airbag manufactured from such a multi-fabric fabric can exhibit excellent air tightness even after deployment. can

Tissues other than the 1/1 plain weave are inserted every number of the above-mentioned 1/1 plain weave in the warp direction of the fabric layer, or inserted every number of the above-mentioned 1/1 plain weave in the weft direction, or in both the warp and weft directions. It can be inserted every 1/1 plain weave number.

Among these, it is advantageous that tissues other than the 1/1 plain weave are inserted for every number of the above-mentioned 1/1 plain weave in both the warp and weft directions of the fabric layer, as it can further improve the tear strength while maintaining the excellent durability of the multi-woven fabric. .

Tissues other than the 1/1 plain weave may be inserted 1 to 5, 1 to 3, 1 to 2, or 1 per number of 1/1 plain weave. Within this range, it is possible to improve the tear strength while maintaining excellent properties of the multi-woven fabric.

At least one layer of the expansion part may include the first region at an area ratio of 5% to 50% with respect to the total area of the corresponding layer. Within this range, a sufficient tear strength improvement effect can be exhibited, and excellent airtightness can be exhibited even when the expansion part rapidly expands due to rapid air inflow.

Two or more types of tissues, including the 1/1 plain weave, are a group consisting of 1/1 plain weave, 2/1 twill, 3/1 satin, 2/2 basket weave and 3/3 basket weave It may be one or more organizations selected from.

If the tissue other than 1/1 plain weave is 4/1, 5/1 or 4/4 other than the above-mentioned tissue, the tear strength may increase, but the elongation, airtightness, etc. It may be difficult to utilize for purposes such as airbags due to deterioration of various characteristics.

Among them, employing at least one tissue selected from the group consisting of 1/1 plain weave, 2/1 twill weave and 3/1 satin weave as two or more types of tissue including the 1/1 plain weave maintains the excellent durability of the multi-weave while maintaining It is advantageous because it can improve tear strength. In particular, by employing a 1/1 plain weave and a 2/1 twill weave as two or more types of tissues including the 1/1 plain weave, it is possible to provide a multi-fabric fabric having the best tear strength and durability.

On the other hand, when tissues other than the 1/1 plain weave are inserted in both the warp and weft directions of the fabric layer, 2/1 twill weave, 3/1 satin weave, and 2/1 plain weave are intersected with tissues other than the 1/1 plain weave. Other weaves may be implemented, such as 2 basket weave, 3/3 basket weave or rip-stop.

For example, as shown in FIG. 2, when 2/1 twill weave is inserted every a certain number of 1/1 plain weave in both the warp and weft directions, a 2/2 basket weave will be implemented at the point where the 2/1 twill weave intersects. can

The first region is inserted into the outermost fabric layer of the multi-fabric to effectively prevent the multi-fabric from being torn by an external sharp object. When the multi-woven fabric is a double-woven fabric, the first region is inserted into all of the two fabric layers, and when the multi-woven fabric is a multi-woven fabric having three or more fabric layers, the first region is inserted into the outer two fabric layers. can be inserted.

Yarns for weaving the multi-fabric include, for example, polyamide fibers obtained by single or copolymerization or mixing of nylon 66, nylon 6, nylon 46, nylon 610, nylon 612, etc.; or polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, or the like, or polyester fibers obtained by copolymerization or mixing thereof.

The fineness of the yarn for weaving the multi-fabric may be 300 to 700 dtex. Within this range, it can expand into a desired shape while meeting the characteristics required during deployment and expansion, and the cell becomes flexible to improve storage properties, and high-speed deployment is possible.

The multi-fabric may exhibit excellent tear strength as it includes the expansion part woven in the above-described unique pattern. In particular, the first region of the multi-woven fabric has a tear strength in the warp direction measured in accordance with ISO 13937-2 of 300 to 800 N, 400 to 750 N, 500 to 700 N, 550 to 650 N, or 600 to 650 N And, the tear strength in the weft direction may be 350 to 900 N, 450 to 850 N, 500 to 800 N, 600 to 800 N, 650 to 750 N or 700 to 750 N.

In addition, the multi-fabric may exhibit high tensile strength and elongation at the level of conventional 1/1 plain weave fabrics even though it exhibits excellent tear strength. In particular, the first region of the multi-fabric has a tensile strength of 3200 to 3500 N / 5cm, 3300 to 3500 N / 5cm, or 3400 to 3500 N / 5cm in the warp direction measured according to ISO 13934-1, and in the weft direction Tensile strength may be 2800 to 3300 N/5cm, 3000 to 3300 N/5cm, 3050 to 3300 N/5cm, or 3100 to 3300 N/5cm. In addition, the first region of the multi-woven fabric has an elongation of 25% to 45%, 30% to 45%, or 35% to 45% in the warp direction measured according to ISO 13934-1, and an elongation in the weft direction of 20% to 40%, 25% to 40% or 27% to 40%. The method of measuring the tear strength, tensile strength and elongation may refer to the details described in the test examples to be described later.

When the multi-fabric is used for vehicle airbags, one side or both sides of the multi-fabric may be coated to prevent air from leaking through gaps in the fabric. The multi-fabric may be coated with a resin commonly used for fiber coating, and may be coated with a silicone resin, a urethane-based resin, an olefin-based resin, or a mixture thereof, as non-limiting examples. The multi-fabric may be coated with the resin through a knife coat method, a doctor blade method, a spray coat method, or the like, and preferably, the resin may be coated by a night coat method.

The method of coating the multi-fabric may be performed by a multi-step coating method in which coating is performed twice or more. When using such a multi-step coating method, airtightness can be improved and flexibility can be secured by reducing the thickness of the fabric compared to the amount of coating.

The coating amount of the resin is about 30 g/m ² to 150 g/m ² , about 50 g/m ² to 150 g/m ² , about 60 g/m ² to 150 g/m ² , or about 70 g/m 2 . m ² to 150 g/m ² , it is possible to provide a lightweight multi-fabric having excellent air pressure performance and storage capacity without causing problems such as a decrease in blocking resistance due to surface stickiness or an increase in cost.

If the resin is coated in a multi-step coating method, the above effect can be further maximized by adjusting the coating amount of the base coating layer to 60 g/m ² to 75 g/m ² .

Meanwhile, according to another embodiment of the present invention, an airbag formed of the multi-fabric is provided. The multi-fabric exhibits not only excellent characteristics of the one-piece woven through the above-described specific tissue pattern, but also significantly improved tear strength and is not easily torn by broken glass fragments. Accordingly, the airbag formed of the multi-fabric material can sufficiently protect the driver or passengers from broken glass fragments even when the vehicle rolls over.

The multi-fabric according to one embodiment of the present invention can provide an airbag capable of sufficiently protecting a driver or passengers by minimizing damage caused by broken glass fragments when a vehicle rolls over.

1 is a view showing a cross section of a double fabric according to an embodiment of the present invention.
2 is a structure diagram of a first region in which 2/1 twill weave is inserted into 1/1 plain weave according to one embodiment of the present invention.
FIG. 3 is a view showing the organizational structure of the double fabric including the first region of FIG. 2;
4 is a structure diagram of a fabric showing a 1/1 plain weave of Comparative Example 1.
5 is a view showing the organizational structure of the double fabric according to the organizational chart of the fabric of FIG.

Hereinafter, the action and effect of the invention will be described in more detail through specific examples of the invention. However, this is presented as an example of the invention, and thereby the scope of the invention is not limited in any sense.

Example 1: Preparation of double fabric

A double weave was manufactured on a jacquard loom using 470 dtex polyamide (nylon 66) yarn.

As shown in FIG. 1, the double fabric has a structure in which two fabric layers separated from each other and the outer circumference of the two fabric layers are connected, and was woven at once by an integral weaving method.

As shown in FIGS. 2 and 3, the two separated fabric layers were prepared to include a first region woven so that 2/1 twill weave was arranged for every three 1/1 plain weave in both warp and weft directions, respectively. .

75 g/m ² of silicone resin is coated on each side of the double fabric prepared above using a knife, and then the temperature is gradually raised to 90° C. to 150° C. fabric was made.

Example 2: Preparation of double fabric

A coated double fabric was manufactured in the same manner as in Example 1, except that in Example 1, the first region was woven so that 2/1 twill weave was arranged for every 5 1/1 plain weave in both warp and weft directions.

Example 3: Preparation of double fabric

A coated double fabric was manufactured in the same manner as in Example 1, except that in Example 1, the first region was woven so that 2/1 twill weave was arranged for every 11 1/1 plain weave in both warp and weft directions.

Example 4: Preparation of double fabric

A coated double fabric was manufactured in the same manner as in Example 1, except that in Example 1, the first region was woven so that 2/1 twill weave was arranged for every 13 1/1 plain weave in both warp and weft directions.

Example 5: Preparation of double fabric

A coated double fabric was manufactured in the same manner as in Example 2, except that the weave pattern was changed so that a 3/1 satin weave was placed instead of a 2/1 twill weave in the first region of Example 2.

Comparative Example 1: Preparation of double fabric

A coated double fabric was prepared in the same manner as in Example 1, except that the double fabric in Example 1 was woven only with 1/1 plain weave as shown in FIGS. 4 and 5.

Test Example: Evaluation of physical properties of double fabric

Five samples were prepared from each of the first regions of the double fabric prepared in Examples 1 to 5, and five samples were prepared from the double fabric prepared in Comparative Example 1. And, the physical properties of the prepared samples were evaluated by the method described below, and the average values were obtained and shown in Table 1.

1. Tear strength

The tear strength of the prepared sample in the warp direction and the weft direction was measured. The tear strength was measured according to ISO 13937-2 after leaving the sample at room temperature for 24 hours, and the tear strength in the warp direction and the tear strength in the weft direction were measured, respectively, and the average value was obtained.

2. Elongation

Elongation of the prepared sample in the warp direction and the weft direction was measured. Elongation was measured according to ISO 13934-1 after leaving the sample at room temperature for 24 hours, and elongation in the warp direction and elongation in the weft direction were measured, respectively, and the average value was obtained.

3. Tensile strength

The tensile strength of the prepared sample in the warp direction and the weft direction was measured. Tensile strength was measured according to ISO 13934-1 after leaving the sample at room temperature for 24 hours, and the tensile strength in the warp direction and the tensile strength in the weft direction were measured, respectively, and the average value was obtained.

Insertion spacing of 1/1 non-plain weave tissue Tear strength (warp direction, N) Tear strength (weft direction, N) Elongation (warp direction, %) Elongation (weft direction, %) The tensile strength
(oblique direction, N/5cm) The tensile strength
(weft direction, N/5cm) Example 1 3 589 700 36 27 3405 3309 Example 2 5 614 708 38 29 3440 3057 Example 3 11 410 458 39 30 3395 3128 Example 4 13 307 366 40 30 3426 3196 Example 5 5 525 494 28 25 3201 2863 Comparative Example 1 0 256 305 41 32 3453 3271

Referring to Table 1, the first region of the multi-weave according to one embodiment of the present invention is a double fabric formed of only 1/1 plain weave (Comparative Example 1) even though it is formed of two or more types of tissues including 1/1 plain weave. It was confirmed that the elongation and tensile strength were exhibited at almost the same level, and the tear strength was remarkably improved. Accordingly, it is confirmed that the multi-fabric fabric according to the embodiment can provide an airbag that is not damaged by broken glass pieces or can minimize damage.

Claims (12)

an expansion unit having a structure of two or more layers separated from each other; And a connection portion surrounding the expansion portion,
At least one layer of the expansion part includes a first region formed of two or more types of tissues including 1/1 plain weave;
The first region is formed by inserting tissues other than 1/1 plain weave every 2 to 15 1/1 plain weave, multi-fabric.
delete The multi-fabric of claim 1, wherein the first region is formed by inserting tissues other than 1/1 plain weave every 2 to 15 1/1 plain weave in both warp and weft directions.
The multi-fabric fabric according to claim 1, wherein the first region is formed by inserting 1 to 5 tissues other than 1/1 plain weave for every 2 to 15 1/1 plain weave.
The multi-fabric of claim 1, wherein the first region is included in an area ratio of 5% to 50% relative to the total area of the corresponding layer.
The method of claim 1, wherein the first region is formed of one or more tissues selected from the group consisting of 1/1 plain weave, 2/1 twill weave, 3/1 satin weave, 2/2 basket weave and 3/3 basket weave. Phosphorus, multi-fabric.
The multi-fabric fabric of claim 1, wherein the first region is formed of at least one tissue selected from the group consisting of 1/1 plain weave, 2/1 twill weave and 3/1 satin weave.
The multi-fabric fabric according to claim 1, wherein the area other than the first area is a second area formed of 1/1 plain weave.
The multi-fabric of claim 1, wherein the first region has a tear strength of 300 to 800 N in the warp direction and a tear strength of 350 to 900 N in the weft direction measured according to ISO 13937-2.
The multi-fabric of claim 1, wherein the first region has a tensile strength of 3200 to 3500 N/5cm in the warp direction and a tensile strength of 2800 to 3300 N/5cm in the weft direction measured according to ISO 13934-1. .
The multi-fabric of claim 1, wherein the first region has an elongation of 25% to 45% in the warp direction and an elongation of 20% to 40% in the weft direction measured according to ISO 13934-1.
An airbag formed of the multi-fabric of claim 1.

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