KR20210038356A - Multi-layer fabric - Google Patents

Abstract

The present invention relates to a multi-layer fabric and an airbag produced by using the multi-layer fabric. The multi-layer fabric can provide an airbag which can sufficiently protect a driver or a passenger by minimizing damage caused by broken glass fragments when a vehicle rolls over. The multi-layer fabric comprises an expansion unit having a structure of two or more layers separated from each other, and a joining unit surrounding the expansion unit.

Description

Multi-layer fabric{MULTI-LAYER FABRIC}

The present invention relates to a multiwoven fabric.

BACKGROUND ART In recent years, there is a demand for improvement in the safety of drivers and passengers in the event of a collision of a transportation system such as a car, and thus, the mounting rate of various airbags is increasing. An airbag is a sensor that senses the impact that a transportation system receives during a head-on collision or a side collision, and then rapidly deploys and expands the airbag by injecting gas from the inflator into the inflatable bubbles, and the driver or passengers due to the cushioning properties of the inflated bubbles. It refers to protecting the human body by mitigating the impact that will be received.

In the past, airbags were mounted on the front side of the driver's seat, or the driver's seat and passenger's seat, and were mainly installed to protect the face and upper body of passengers in the event of a frontal collision. However, in recent years, curtain-type airbags have also been developed that can cope with a collision from the side or a rollover of a transportation system.

This curtain-type airbag is designed to be accommodated in a region from the front pillar side to the rear pillar side along the roof rail of the side wall of the vehicle, and inflate and deploy along the side windows in the event of a collision. Curtain-type airbags have excellent storage capacity (can be folded compactly), and the distance between the passenger's head and the side glass is short, so in the event of a side collision, it is necessary to instantly squeeze between the passenger's head and the glass to protect the head. Fast deployment speed is required. In addition, it is required to maintain a certain degree of internal pressure for a few seconds after being deployed at the time of overturning the transportation system. However, it is very rare that the side glass is not broken when the transportation system is overturned, and there is a problem that the airbag is easily torn by the broken side glass fragments, making it difficult to protect the passengers.

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

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

Hereinafter, a multi-woven 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 portion having a structure of two or more layers separated from each other; And a joining part surrounding the expanded part, wherein at least one layer of the expanded part is provided with a multiwoven fabric including a first region formed of two or more types of tissues including 1/1 plain weave.

The multi-woven 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 expanded part.

Multi-woven fabrics are used for vehicle airbags and life jackets as they have the property of being able to be inflated by the airframe. In particular, the multi-fabric used in the vehicle airbag needs to be maintained in a swollen state to protect the driver or passenger when the vehicle rolls over. However, there is a problem in that the multi-fabric used in the airbag is torn by broken glass fragments of the vehicle, so that the driver or passenger cannot be sufficiently protected.

The present invention was completed by discovering that when a specific tissue pattern is introduced into such a multi-woven fabric, it is possible to minimize damage due to broken glass fragments while maintaining the excellent properties of the one-piece woven fabric.

The expanded portion of the multi-woven 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 the present specification.

Since the expansion part is closed by a connection part surrounding it, when gas is supplied to the expansion part, the supplied gas may be confined and inflated.

The multi-woven fabric is a one piece woven fabric manufactured by an integral weaving method, and the joining portion is a yarn (warp or weft) of one fabric layer constituting the expansion portion and a yarn (weft or weft) of another fabric layer. Inclination) may mean a group of tissue points (bonding points) formed along the edge of the expansion portion by intersecting. More specifically, the joining portion is a group of tissue points formed along the edge of the expanding portion by crossing the warp of one fabric layer constituting the expanding portion with the weft of the other textile layer, or of any one of the textile layers constituting the expanding portion. The warp yarn and the weft yarn may be a group of tissue points formed along the edge of the expansion portion by intersecting the weft yarn and the warp of one other fabric layer, respectively. If the multi-woven fabric includes an expanded portion having a structure of three or more layers separated from each other, the yarns of the two outermost layers of the fabric are intersected to form a tissue point along the edge of the expanded portion, thereby closing the expanded portion. Of course, portions for introducing components necessary in the relevant technical field, such as an inlet for supplying gas to the expansion portion, can be manufactured without being closed.

In the present specification, a double fabric having a two-layer structure as the multi-woven fabric will be described in detail, but this content may be applied to a multi-woven fabric having a three-layer structure or more as it is.

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

The multi-woven fabric according to the embodiment may include a first region in which at least one layer constituting the expansion portion is 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 yarn is densely filled. In textiles, the tear strength refers to the strength of the force required when the yarn forming the warp or weft is broken.If a force is applied to only one yarn, the yarn breaks instantaneously, but the same force is applied to two or more yarns. The ground yarn is pushed out by force rather than breaking. This yarn movement effect occurs more frequently in other tissues than in 1/1 plain weave, so a fabric woven with a tissue other than 1/1 plain weave can exhibit a relatively higher tear strength than a fabric woven with 1/1 plain weave. . However, fabrics woven with a structure other than 1/1 plain weave have very low tensile strength than 1/1 plain weave, and are therefore unsuitable for use as airbag fabrics.

Accordingly, in the multi-woven fabric according to the embodiment, at least one layer constituting the expansion part is 1/1 plain weave so that it is not easily torn by sharp objects such as broken glass shards and can exhibit excellent mechanical properties such as tensile strength. It includes a first region formed of two or more types of tissues including.

In addition, the remaining regions of the layer constituting the expansion part except for the first region may be configured as a second region formed of 1/1 plain weave.

As a result, the multi-woven fabric exhibits excellent tensile strength comparable to that of the 1/1 plain woven fabric, while exhibiting remarkably improved tear strength compared to the 1/1 plain woven fabric, making it suitable for use in curtain-type airbags that are easily torn by glass fragments. have.

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

More specifically, in the first region, other tissues other than the 1/1 plain weave are 2 to 15, 2 to 13, 2 to 11, 3 to 15, 5 to 15, 3 to 13 It can be woven in a pattern that is inserted every, 5 to 11, 2 to 5, 3 to 5, or about 5 pieces. The multi-woven fabric including this first area can exhibit very improved tear strength compared to the general OPW fabric made of only 1/1 plain weave, and the airbags made from these multi-woven fabrics exhibit excellent air tightness even after deployment. I can.

Other tissues other than the 1/1 plain weave are inserted every 1/1 plain weave number described above with respect to the warp direction of the fabric layer, or inserted every 1/1 plain weave number described above with respect to the weft direction, or detailed in both warp and weft directions. It can be inserted every 1/1 number of plain weaves.

Among these, it is advantageous that a tissue other than the 1/1 plain weave is inserted every 1/1 plain weave number described above in both the warp and weft directions of the fabric layer, while maintaining excellent durability of the multi-woven fabric and further improving the tear strength. .

Other tissues other than the 1/1 plain weave may be inserted 1 to 5, 1 to 3, 1 to 2, or 1 for each 1/1 plain weave number described above. Within this range, it is possible to improve the tear strength while maintaining excellent general characteristics of the multi-woven fabric.

At least one layer of the expansion part may include a first area in an area ratio of 5% to 50% of the total area of the corresponding layer. Within this range, a sufficient effect of improving tear strength may be exhibited, and excellent airtightness may be exhibited even when the expansion portion is rapidly deployed 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 tissues selected from.

If other tissues other than 1/1 plain weave are 4/1, 5/1, or 4/4 other than the above-described tissue, the tear strength may increase, but the elongation and airtightness that must be provided as an airbag fabric It may be difficult to use for purposes such as airbags due to deterioration of all characteristics.

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

On the other hand, when other 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 runner weave, and 2/ Other organizations can be implemented, such as 2 basket weave, 3/3 basket weave or rip-stop.

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

The first region is inserted into the outermost fabric layer of the multi-woven fabric to effectively prevent tearing of the multi-woven fabric from external sharp objects. When the multi-woven fabric is a double-woven fabric, the first region is inserted into all of the two-layer fabric layers, and if the multi-woven fabric is a multi-woven fabric having three or more fabric layers, the first region is the outer two-layer fabric layer. Can be inserted.

The yarn for weaving the multi-woven fabric may include, for example, nylon 66, nylon 6, nylon 46, nylon 610, nylon 612, or the like, or polyamide fibers obtained by copolymerization or mixing thereof; Or polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, or the like may be used alone, or polyester fibers obtained by copolymerization or mixing thereof.

The fineness of the yarn for weaving the multi-woven may be 300 to 700 dtex. Within this range, it can expand into a desired shape while satisfying the characteristics required for expansion and expansion, and the air bubbles become flexible, so that the storage property is improved, and high-speed expansion is possible.

The multi-woven fabric may exhibit excellent tear strength by including the expanded portion 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 according to ISO 13937-2 from 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, although the multi-woven fabric exhibits excellent tear strength, it may exhibit high tensile strength and elongation equivalent to that of a conventional 1/1 plain woven fabric. In particular, the first region of the multi-woven 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 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 in the warp direction of 25% to 45%, 30% to 45%, or 35% to 45%, measured according to ISO 13934-1, and the elongation in the weft direction is 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 items described in Test Examples to be described later.

When the multi-woven fabric is used in an airbag for a vehicle, one or both sides of the multi-woven fabric may be coated to prevent air from leaking through the gaps of the fabric. The multi-woven fabric may be coated with a resin conventionally used for fiber coating, and as a non-limiting example, it may be coated with a silicone resin, a urethane-based resin, an olipine-based resin, or a mixture thereof. The multi-woven 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-woven fabric may be performed by a multi-step coating method of coating two or more times. 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 coating amount.

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 By ^{adjusting it to m 2} to 150 g/m ² , it is possible to provide a lightweight multi-woven fabric having excellent air pressure performance and storage without causing problems such as a decrease in blocking resistance or an increase in cost due to surface stickiness.

If the resin is coated in a multi-step coating method, the above-described 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-woven fabric is provided. The multi-woven fabric exhibits not only excellent properties of the one-piece woven fabric but also remarkably improved tear strength through the above-described specific structure pattern, and is not easily torn by broken glass fragments. Accordingly, the airbag formed of the multi-woven fabric can sufficiently protect the driver or passenger from broken glass fragments even when the vehicle is overturned.

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

1 is a view showing a cross-section of a double fabric according to an embodiment of the present invention.
2 is an organization diagram of a first area in which a 2/1 twill weave is inserted into a 1/1 plain weave according to an embodiment of the present invention.
3 is a view showing the structure of a 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 a double fabric according to the organizational chart of the fabric of FIG. 4.

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 the scope of the invention is not limited to any meaning by this.

Example 1: Preparation of double-woven fabric

Using 470 dtex polyamide (nylon 66) yarn, a double-woven fabric was manufactured in a jacquard loom.

As shown in FIG. 1, the double fabric has a structure in which two separate fabric layers and the outer circumferences of the two fabric layers are joined together, and is woven at one time by an integral weaving method.

The two woven layers separated by layers were manufactured to include a first region woven so that 2/1 twill is arranged for every 3 1/1 plain weave in both warp and weft directions, respectively, as shown in FIGS. 2 and 3 .

^{After coating a silicone resin of 75 g/m 2} on both sides of the prepared double fabric using a knife, the temperature was gradually increased to 90°C to 150°C to proceed with the primary curing, and then heat treated at 180°C to coat the coated double The fabric was prepared.

Example 2: Preparation of double-woven fabric

In Example 1, a coated double fabric was prepared in the same manner as in Example 1, except that the first region was woven so that 2/1 twill was arranged every 5 1/1 plain weaves in both the warp and weft directions.

Example 3: Preparation of double-woven fabric

In Example 1, a coated double fabric was prepared in the same manner as in Example 1, except that the first region was woven so that 2/1 twill was disposed every 11 1/1 plain weaves in both the warp and weft directions.

Example 4: Preparation of double-woven fabric

In Example 1, a coated double-woven fabric was prepared in the same manner as in Example 1, except that the first region was woven so that 2/1 twill was arranged every 13 1/1 plain weaves in both the warp and weft directions.

Example 5: Preparation of double-woven fabric

In the first area of Example 2, a coated double fabric was prepared in the same manner as in Example 2, except that the tissue pattern was changed so that the 3/1 twill weave was disposed instead of the 2/1 twill weave.

Comparative Example 1: Preparation of double fabric

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

Test Example: Evaluation of physical properties of double fabrics

Five samples were prepared each in the first region of the double fabric prepared in Examples 1 to 5, and five samples were prepared from the double fabric prepared in Comparative Example 1. Then, the physical properties of the prepared samples were evaluated by the method described below, and the average value was calculated and shown in Table 1.

1. Tear strength

The tear strength in the warp direction and the weft direction of the prepared sample was measured. Tear strength was measured according to ISO 13937-2 after the sample was left 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 calculated.

2. Elongation

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

3. Tensile strength

Tensile strength in the warp direction and the weft direction of the prepared sample was measured. Tensile strength was measured according to ISO 13934-1 after the sample was left 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 calculated.

1/1 Insertion spacing of non-plain weave tissue Tear strength (inclined direction, N) Tear strength (weft direction, N) Elongation (inclined direction, %) Elongation (weft direction, %) The tensile strength
(Tilt 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-woven fabric according to an embodiment of the present invention is a double-woven fabric (Comparative Example 1) formed of only 1/1 plain weave, even if it is formed of two or more types of tissues including 1/1 plain weave. It is confirmed that it shows remarkably improved tear strength while showing almost the same level of elongation and tensile strength. Accordingly, it is confirmed that the multi-fabric according to the embodiment can provide an airbag that is not damaged by a broken glass piece or can minimize damage.

Claims (12)

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

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