Double-layer fabric

Abstract

The present disclosure relates to a double fabric. According to the present application, there is provided a double fabric in which a stress applied to a tether formed inside an airbag fabric during inflation of an airbag can be relaxed by breaking a low-strength yarn in the airbag fabric instead of breaking a tether yarn, thus, the tether yarn is prevented from being broken and the deployment shape of the airbag is controlled.

Description

Technical Field

[0001] The present application relates to double-layer fabrics. In particular, the present disclosure relates to double-layer fabrics that can be used as airbags. Background Art

[0002] Airbags are installed to protect the user in the event of an accident while the vehicle is moving. For example, a curtain-type airbag may be installed at a location such as a side beam of a car. Since the curtain-type airbag should have excellent internal pressure retention capability in response to a vehicle rollover situation, the curtain-type airbag may be woven using a seamless jacquard. Generally, the airbag fabric manufactured as above is called OPW (One-Piece Fabric).

[0003] Since OPW uses a knitting method that directly forms a pocket in the knitting step without a seamless process, there is a problem in controlling inflation. Overinflation may cause brain damage to the user. Therefore, in order to appropriately control the inflation speed of the cushion and the volume of the inflated cushion, a tether is formed inside the airbag fabric in the prior art. However, when the airbag is inflated, there is a problem that stress is applied to the tether portion, which causes the yarn forming the tether to break easily, and the effect of applying the tether is not fully obtained. Summary of the invention

[0004] Technical issues

[0005] An object of the present application is to provide a double-layer fabric that solves the above-mentioned problems of the prior art.

[0006] Another object of the present application is to provide an airbag that protects the user from brain damage.

[0007] The above and other objects of the present application can be solved by the invention of the present application described in detail below.

[0008] Technical Solution

[0009] According to one embodiment of the present disclosure, a double-layer fabric is provided, comprising: a first fabric layer, woven by crossing a first yarn extending in a first direction with a second yarn extending in a second direction; a second fabric layer, woven by crossing a third yarn extending in the first direction with a fourth yarn extending in the second direction; and tether yarns woven with the first yarn and the third yarn to connect the first fabric layer and the second fabric layer, wherein at least some of the first yarn and the third yarn include low-strength yarns and high-strength yarns alternately arranged in the second direction, and in an area where the tether yarn that has crossed the first yarn crosses the third yarn, the tether yarn is woven only over the low-strength yarns among the first yarns and the low-strength yarns among the third yarns.

[0010] The tether yarn is woven with the first yarn of the first fabric layer and the third yarn of the second fabric layer, and in the area where the tether yarn that has crossed the first yarn crosses the third yarn, the tether yarn is woven only over the low-strength yarn among the first yarn and the low-strength yarn among the third yarn. Therefore, when the double-layer fabric is inflated, the low-strength yarn may be broken due to the force applied to the tether yarn.

[0011] There may be one or two or more tether yarns. In one embodiment, when there are two or more tether yarns, the two or more tether yarns may cross each other to form an X shape between the first fabric layer and the second fabric layer when viewed from a cross section of the double-layer fabric.

[0012] In one embodiment, the first yarn consists of low-strength yarns and high-strength yarns alternately arranged in the second direction, and may cross the second yarn after forming a pair consisting of one low-strength yarn and one high-strength yarn.

[0013] In one embodiment, the third yarn consists of low-strength yarns and high-strength yarns alternately arranged in the second direction, and may cross the fourth yarn after forming a pair consisting of one low-strength yarn and one high-strength yarn.

[0014] In one embodiment, the first yarns consist of low-strength yarns and high-strength yarns alternately arranged in the second direction, and some of the first yarns may cross the tether yarns after forming a pair consisting of one low-strength yarn and one high-strength yarn.

[0015] In one embodiment, the third yarns consist of low-strength yarns and high-strength yarns alternately arranged in the second direction, and some of the third yarns may cross the tether yarns after forming a pair consisting of one low-strength yarn and one high-strength yarn.

[0016] In a specific embodiment, the first yarn and the third yarn are composed of low-strength yarns and high-strength yarns arranged alternately in the second direction, and the first yarn and the third yarn may cross the second yarn and the fourth yarn respectively after forming a pair consisting of one low-strength yarn and one high-strength yarn. Some of the first yarns cross the tether yarn after forming a pair consisting of one low-strength yarn and one high-strength yarn, and some of the third yarns may cross the tether yarn after forming a pair consisting of one low-strength yarn and one high-strength yarn. In the area where the tether yarn that has crossed the first yarn crosses the third yarn, the tether yarn may be woven only on the low-strength yarn among the first yarns and the low-strength yarn among the third yarns.

[0017] In one embodiment in which the first yarn and the third yarn consist of low-strength yarns and high-strength yarns alternately arranged in the second direction, when the number of high-strength yarns is n, the number of low-strength yarns may be n+1.

[0018] In another embodiment, the first yarn includes low-strength yarns and high-strength yarns alternately arranged in the second direction in some areas, and may include high-strength yarns in the remaining areas. In some areas, the first yarn crosses the second yarn after forming a pair consisting of one low-strength yarn and one high-strength yarn, and in the remaining areas, the high-strength yarn may cross the second yarn.

[0019] In another embodiment, the third yarn includes low-strength yarns and high-strength yarns alternately arranged in the second direction in some areas, and may include high-strength yarns in the remaining areas. In some areas, the third yarn crosses the fourth yarn after forming a pair consisting of one low-strength yarn and one high-strength yarn, and in the remaining areas, the high-strength yarn may cross the fourth yarn.

[0020] In another embodiment, the first yarn includes low-strength yarns and high-strength yarns alternately arranged in the second direction in some regions, and may include high-strength yarns in the remaining regions. In the remaining regions, the first yarn as the high-strength yarn may cross the tether yarn.

[0021] In another embodiment, the third yarn includes low-strength yarns and high-strength yarns alternately arranged in the second direction in some areas, and can include high-strength yarns in the remaining areas. In the remaining areas, the third yarn as the high-strength yarn can cross the tether yarn.

[0022] In another specific embodiment, the first yarn and the third yarn include low-strength yarns and high-strength yarns alternately arranged in the second direction in some areas, and may include high-strength yarns in the remaining areas. In some areas, the first yarn and the third yarn cross the second yarn and the fourth yarn respectively after forming a pair consisting of a low-strength yarn and a high-strength yarn, and in the remaining areas, the first yarn and the third yarn as high-strength yarns may cross the second yarn and the fourth yarn respectively. The first yarn as a high-strength yarn crosses the tether yarn, and the third yarn as a high-strength yarn may cross the tether yarn in the remaining areas. In the area where the tether yarn that has crossed the first yarn crosses the third yarn, the tether yarn may be woven only on the low-strength yarn among the first yarn and the low-strength yarn among the third yarn.

[0023] The first to fourth yarns and the tether yarn may each independently include one or more fibers selected from polyester fibers, polyamide fibers, aramid fibers, polyketone fibers, carbon fibers, and cellulose fibers, but the present disclosure is not limited thereto.

[0024] For example, the low-strength yarn may have a smaller fineness than the high-strength yarn or a lower tenacity (N) than the high-strength yarn.

[0025] For example, the high strength yarn, the second yarn, and the fourth yarn may comprise the same fiber.

[0026] Beneficial Effects

[0027] According to the present application, a double-layer fabric is provided in which the stress applied to the tether formed inside the airbag fabric during the inflation of the airbag can be relaxed by breaking the low-strength yarn in the airbag fabric instead of breaking the tether yarn, thereby preventing the tether yarn from breaking and controlling the deployment shape of the airbag. Therefore, an airbag that prevents brain damage by using the double-layer fabric can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A cross section of a double-layer fabric with applied tethers according to the prior art is schematically shown.

[0029] Figure 2 It is to illustrate that Figure 1 There is a problem that when the double-layer fabric is inflated, the tether yarn (T) constituting the tether is easily broken when stress is applied to the tether.

[0030] Figure 3The cross-section of a double-layer fabric according to one embodiment is schematically shown, wherein the double-layer fabric includes a first fabric layer (L1) and a second fabric layer (L2), wherein in the first fabric layer (L1), a first yarn (Y1) composed of alternating low-strength yarns (Y1a) and high-strength yarns (Y1b) are woven with a second yarn (Y2); and in the second fabric layer (L2), a third yarn (Y3) composed of alternating low-strength yarns (Y3a) and high-strength yarns (Y3b) are woven with a fourth yarn (Y4).

[0031] Figure 4 To illustrate that Figure 3 The stress applied to the tether is distributed to the low-strength yarns (Y1a, Y3a) when the double-layer fabric is inflated.

[0032] Figure 5 It is shown that even if stress is applied to the low-strength yarn (Y1a, Y3a) and the low-strength yarn (Y1a, Y3a) is Figure 4 Although the tether yarn (T) is broken as shown in FIG, it is also not broken and can still connect the first fabric layer (L1) with the second fabric layer (L2) while being fastened to the first yarn (Y1) and the third yarn (Y3).

[0033] Figure 6 The cross-section of a double-layer fabric according to another embodiment is schematically shown, wherein the double-layer fabric comprises a first fabric layer (L1) and a second fabric layer (L2), wherein in the first fabric layer (L1), in some areas (AT) there are alternating low-strength yarns (Y1a) and high-strength yarns (Y1b), and in the remaining areas, the first yarn (Y1) including the high-strength yarn (Y1b) is woven with the second yarn (Y2); and in the second fabric layer (L2), in some areas (AT) there are alternating low-strength yarns (Y3a) and high-strength yarns (Y3b), and in the remaining areas, the third yarn (Y3) including the high-strength yarn (Y3b) is woven with the fourth yarn (Y4).

[0034] <Description of Reference Numerals>

[0035] L1: first fabric layer, L2: second fabric layer

[0036] Y1: first yarn, Y2: second yarn, Y3: third yarn, Y4: fourth yarn

[0037] Y1a, Y3a: Low-strength yarn

[0038] Y1b, Y3b: High-strength yarn

[0039] T: tether yarn, T1: first tether yarn, T2: second tether yarn

[0040] AT: Some area or regions where the tether yarn (T) that has crossed the first yarn (Y1) crosses the third yarn (Y3) DETAILED DESCRIPTION

[0041] Hereinafter, the embodiments of the present application will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification.

[0042] According to one embodiment of the present disclosure, there is provided a double-layer fabric, comprising: a first fabric layer woven by crossing a first yarn extending in a first direction with a second yarn extending in a second direction; a second fabric layer woven by crossing a third yarn extending in the first direction with a fourth yarn extending in the second direction; and a tether yarn woven with the first yarn and the third yarn to connect the first fabric layer with the second fabric layer,

[0043] wherein at least some of the first yarns and the third yarns include low-strength yarns and high-strength yarns alternately arranged in the second direction, and

[0044] In the area where the tether yarn that has crossed the first yarn crosses the third yarn, the tether yarn is woven only over the low-strength yarn among the first yarn and the low-strength yarn among the third yarn.

[0045] According to the prior art, a double-layer fabric for an airbag with an inner tether is manufactured without distinguishing between warp yarns and weft yarns. For example, in the prior art, single yarns such as ordinary filament yarns or twisted yarns are generally used for the weft yarns and warp yarns of the double-layer fabric. These single yarns generally have a fineness of 400 to 600 deniers.

[0046] Reference Figure 1 and Figure 2 In the prior art, when the double-layer fabric is inflated, the tether yarn (T) constituting the tether is subjected to a direct force (inflation force), thereby causing a problem of breakage. In addition, when a force is applied to the tether yarn (T), the tether yarn (T) or other yarns (Y1, Y2, Y3, Y4) are pushed out of their original positions, thereby causing a problem of pinholes. These problems deteriorate the degree of internal pressure maintenance of the airbag.

[0047] The present application was developed to solve these problems. Specifically, in the present disclosure, a pair of heterogeneous yarns having different strengths are used as weft yarns or warp yarns of a double-layer fabric, and the tether yarn is arranged above the yarn having relatively low strength. Due to this configuration, when the double-layer fabric is inflated and an external force (tension or inflation force) acts on the tether yarn, only the low-strength yarn may break, and the impact applied to the tether yarn can be absorbed. Therefore, the above configuration can prevent the tether yarn from breaking and gas leakage due to pinholes. In addition, even if the low-strength yarn breaks, the tether yarn is located above the high-strength yarn adjacent to the low-strength yarn, so through the inner tether design, the inflation rate and / or inflation volume of the double-layer fabric can be controlled while maintaining the length of the tether composed of the intended tether yarn.

[0048] Reference Figure 3 The double-layer fabric comprises a first fabric layer (L1) and a second fabric layer (L2). The first fabric layer (L1) and the second fabric layer (L2) can be arranged to face each other. The first fabric layer (L1) and the second fabric layer (L2) are connected to each other by a tether yarn (T).

[0049] The first fabric layer (L1) may be woven by crossing a first yarn (Y1) extending in a first direction (x direction) with a second yarn (Y2) extending in a second direction (y direction). The second fabric layer (L2) may be woven by crossing a third yarn (Y3) extending in the first direction (x direction) with a fourth yarn (Y4) extending in the second direction (y direction). At this time, the first yarn (Y1) and the third yarn (Y3) may be any one of a warp yarn and a weft yarn, and the second yarn (Y2) and the fourth yarn (Y4) may be the other of a warp yarn and a weft yarn.

[0050] The double-layer fabric has gas inflation or expandability. For example, the double-layer fabric of the present disclosure can have gas inflation by bonding the first fabric layer (L1) and the second fabric layer (L2) facing each other. In addition, the air tightness of the double-layer fabric can reach a degree that allows the double-layer fabric to have the above-mentioned gas inflation or expandability. For example, the first fabric layer (L1) and the second fabric layer (L2) are connected together to prevent gas from escaping from between the first fabric layer (L1) and the second fabric layer (L2), and the double-layer fabric can be constructed to withstand the pressure of the inflation gas. Therefore, when gas enters, the double-layer fabric expands and protects the user from external impact.

[0051] There is no particular limitation on the method of connecting the first fabric layer (L1) and the second fabric layer (L2). For example, the first fabric layer (L1) and the second fabric layer (L2) may be manufactured by a one-piece weaving method, and the separated first fabric layer (L1) and the second fabric layer (L2) may be woven simultaneously. That is, the first fabric layer (L1) and the second fabric layer (L2) may be connected by a connection point.

[0052] In a double-layer fabric for an airbag, a seam is sometimes formed in the inflated portion to control the deployment shape of the double-layer fabric when inflated. However, according to one embodiment of the present disclosure, a double-layer fabric that can be inflated into a balloon shape without sewing can be provided using a jacquard loom. Specifically, since a fabric pattern including an inner tether is formed in the double-layer fabric according to the above embodiment, a nonwoven airbag can be provided that does not form a seam for controlling the deployment shape of the double-layer fabric when inflated.

[0053] In the above double-layer fabric, there is no particular restriction on the application position of the tether composed of the tether yarn. For example, the tether can be applied to some areas of the double-layer fabric, which will be subjected to the maximum force (stress) when the double-layer fabric is actually inflated.

[0054] Reference Figure 3 , the tether yarn (T) is woven by crossing with the first yarn (Y1) and the third yarn (Y3) in the same manner as the second yarn (Y2) and the fourth yarn (Y4). In the drawings of the present application, for ease of explanation, the tether yarn (T) is shown separately from the second yarn (Y2) and the fourth yarn (Y4). However, since the tether yarn (T) is also woven by crossing with the first yarn (Y1) and the third yarn (Y3), the tether yarn (T) can be understood as the second yarn (Y2) or the fourth yarn (Y4). For example, when the second yarn (Y2) and the fourth yarn (Y4) are warp yarns, the tether yarn (T) can also be a warp yarn, and when the second yarn (Y2) and the fourth yarn (Y4) are weft yarns, the tether yarn (T) can also be a weft yarn.

[0055] Reference Figure 3 In one example, the first yarn (Y1) may be composed of low-strength yarns (Y1a) and high-strength yarns (Y1b) alternately arranged in the second direction (y direction). The first yarn (Y1) may be composed of a pair consisting of one low-strength yarn (Y1a) and one high-strength yarn (Y1b), and may be crossed with the second yarn (Y2) to form the first fabric layer (L1).

[0056] In one example, the third yarn (Y3) may be composed of low-strength yarns (Y3a) and high-strength yarns (Y3b) alternately arranged in the second direction (y direction). The third yarn (Y3) may be composed of a pair of one low-strength yarn (Y3a) and one high-strength yarn (Y3b), and may be crossed with the fourth yarn (Y4) to form the second fabric layer (L2).

[0057] The low-strength yarns (Y1a, Y3a) and high-strength yarns (Y1b, Y3b) constituting the first yarn (Y1) or the third yarn (Y3) are alternately arranged adjacent to each other, and no other fibers may exist between the low-strength yarns (Y1a, Y3a) and the high-strength yarns (Y1b, Y3b).

[0058] In the present disclosure, among two types of fibers having different strengths, a yarn having relatively high strength is referred to as a "high-strength yarn," and a yarn having relatively low strength is referred to as a "low-strength yarn." In one example, the low-strength yarn (Y1a, Y3a) means having lower fineness or lower tenacity (N) than the high-strength yarn (Y1b, Y3b).

[0059] In one example, when the first yarn (Y1) and the third yarn (Y3) are each composed of low-strength yarns (Y1a, Y3a) and high-strength yarns (Y1b, Y3b) alternately arranged in the second direction (y direction), and the number of high-strength yarns (Y1b, Y3b) is n, the number of low-strength yarns (Y1a, Y3a) can be n+1 or greater.

[0060] Reference Figure 3 In one example, the first yarn (Y1) may be woven by forming a pair consisting of a low-strength yarn (Y1a) and a high-strength yarn (Y1b) and then crossing with the tether yarn (T).

[0061] In one example, the third yarn (Y3) may be woven by forming a pair consisting of one low-strength yarn (Y3a) and one high-strength yarn (Y3b), and then crossing with the tether yarn (T).

[0062] Reference Figure 3 In one example, in an area (AT) where the tether yarn (T) that has crossed the first yarn (Y1) crosses the third yarn (Y3), the tether yarn (T) may be woven only on the low-strength yarn (Y1a) among the first yarn (Y1) and the low-strength yarn (Y3a) among the third yarn (Y3).

[0063] Reference Figure 4When the tether yarn (T) woven as above is included, the low-strength yarn (Y1a, Y3a) located above the tether yarn (T) may be ruptured (broken) due to the force applied to the tether yarn (T) when the double-layer fabric is inflated (the inflation force caused by the gas or the tension applied to the tether yarn (T) caused by the gas-induced inflation).

[0064] Reference Figure 5 When the double-layer fabric according to one embodiment is deployed by rupture of the low-strength yarns (Y1a and Y3a), the double-layer fabric can maintain the desired shape of the tether by absorbing the stress applied to the tether. Therefore, the use of the double-layer fabric according to the above embodiment makes it easy to control the deployment shape of the airbag and has the advantage of effectively preventing brain damage to the user due to overinflation of the airbag.

[0065] Reference Figure 6 In one example, the first yarn (Y1) includes low-strength yarns (Y1a) and high-strength yarns (Y1b) alternately arranged in the second direction (y direction) in some areas (AT), and may include high-strength yarns (Y1b) in the remaining areas. In some areas (AT), the first yarn (Y1) may cross the second yarn (Y2) after forming a pair consisting of one low-strength yarn (Y1a) and one high-strength yarn (Y1b). In the remaining areas, the high-strength yarn (Y1b) may cross the second yarn (Y2) to form the first fabric layer (L1).

[0066] In one example, the third yarn (Y3) includes low-strength yarns (Y3a) and high-strength yarns (Y3b) alternately arranged in the second direction (y direction) in some areas (AT), and may include high-strength yarns (Y3b) in the remaining areas. In some areas (AT), the third yarn (Y3) may cross with the fourth yarn (Y4) after forming a pair consisting of one low-strength yarn (Y3a) and one high-strength yarn (Y3b). In the remaining areas, the high-strength yarn (Y3b) may cross with the fourth yarn (Y4) to form the second fabric layer (L2).

[0067] The arrangement of the low-strength yarns (Y1a, Y3a) and the high-strength yarns (Y1b, Y3b) in some areas (AT) can be compared with the reference Figure 3 Same as described.

[0068] Reference Figure 6 In one example, the high strength yarn (Y1b) as the first yarn (Y1) in the remaining areas excluding some areas (AT) may be woven by crossing with the tether yarn (T).

[0069] In one example, the high strength yarn (Y3b) as the third yarn (Y3) in the remaining areas excluding some areas (AT) may be woven by crossing with the tether yarn (T).

[0070] Reference Figure 6 In one example, in the area (AT) where the tether yarn (T) that has crossed the first yarn (Y1) crosses the third yarn (Y3), the tether yarn (T) may be woven only over the low-strength yarn (Y1a) among the first yarn (Y1) and the low-strength yarn (Y3a) among the third yarn (Y3). When the tether yarn (T) is woven in this manner, the same effect as described above can be achieved. Figure 6 As shown in , when low strength yarns (Y1a, Y3a) are placed only in some areas (AT), a double-layer fabric with higher strength can be provided.

[0071] A double-layer fabric may include two or more tether yarns (T). Figure 3 and Figure 6 , for convenience, a cross section of a double-layer fabric to which two tether yarns (T) are applied is shown, but the number of tether yarns (T) is not limited thereto.

[0072] Reference Figure 3 or Figure 6 When viewed from a cross section of the double-layer fabric, two or more tether yarns (T1, T2) may cross each other to form an X shape between the first fabric layer (L1) and the second fabric layer (L2).

[0073] Specifically, the first yarn (Y1) and the third yarn (Y3) can be connected from one end (for example, Figure 3 or Figure 6 left side) to the other end (for example, Figure 3 or Figure 6 The first fabric layer (L1) and the second fabric layer (L2) are formed by crossing the first yarn (Y1) and the third yarn (Y3) with the second yarn (Y2) and the fourth yarn (Y4), respectively.

[0074] Reference Figure 3 or Figure 6, a first tether yarn (T1) as one of the plurality of tether yarns (T) can be woven with the first yarn (Y1) from one end to the other end in the second direction (y direction) to form a portion of the first fabric layer (L1). The first tether yarn (T1) can be woven with the third yarn (Y3) only on the low-strength yarn (Y1a) among the first yarns (Y1). At this time, the first tether yarn (T1) can be woven with the third yarn (Y3) from one end to the other end in the second direction (y direction) to form a portion of the second fabric layer (L2). The first tether yarn (T1) passes through the space between the first fabric layer (L1) and the second fabric layer (L2) only on the low-strength yarn (Y1a) among the first yarns (Y1), and can be woven only on the low-strength yarn (Y3a) among the third yarns (Y3) of the second fabric layer (L2). Therefore, as described above, the force (stress) applied to the first tether yarn (T1) is distributed to the low-strength yarns (Y1a, Y3a) of the first fabric layer (L1) and the second fabric layer (L2), thereby preventing the tether from breaking.

[0075] At the same time, refer to Figure 3 or Figure 6 , the second tether yarn (T2), which is one of the multiple tether yarns (T), can be woven with the third yarn (Y3) from one end to the other end in the second direction (y direction) to form a part of the second fabric layer (L2). The second tether yarn (T2) can be woven with the first yarn (Y1) only on the low-strength yarn (Y3a) among the third yarn (Y3). At this time, the second tether yarn (T2) can be woven with the first yarn (Y1) from one end to the other end in the second direction (y direction) to form a part of the first fabric layer (L1). Similar to the first tether yarn (T1), the second tether yarn (T2) passes through the space between the first fabric layer (L1) and the second fabric layer (L2) only on the low-strength yarn (Y3a) among the third yarn (Y3), and can be woven only on the low-strength yarn (Y1a) among the first yarn (Y1) of the first fabric layer (L1). Therefore, as Figure 3 and Figure 6 As shown in FIG, when viewed from a cross section of the double-layer fabric, the first tether yarn (T1) and the second tether yarn (T2) may cross each other between the first fabric layer (L1) and the second fabric layer (L2) to form an X shape. A plurality of tether yarns may cross each other to form a tether that more tightly connects the first fabric layer (L1) and the second fabric layer (L2).

[0076] There is no particular limitation on the type of yarn used to weave the double-layer fabric. For example, the first to fourth yarns (Y1, Y2, Y3, Y4) and the tether yarn (T) may each independently include one or more fibers selected from polyester fibers (e.g., PET), polyamide fibers (e.g., nylon), aramid fibers, polyketone fibers, carbon fibers, and cellulose fibers.

[0077] In one example, the low-strength yarn (Y1a, Y3a) may be a fiber having a fineness of 10 to 400 deniers. Specifically, the low-strength yarn (Y1a, Y3a) may be a fiber having a fineness of 50 deniers or more, 150 deniers or more, 200 deniers or more, 250 deniers or more, 300 deniers or more, or 350 deniers or less, 300 deniers or less, 250 deniers or less, 200 deniers or less, 150 deniers or less, 100 deniers or less, or 50 deniers or less.

[0078] In one example, the high-strength yarn (Y1b, Y3b) may refer to a fiber having a relatively higher fineness than the low-strength yarn (Y1a, Y3a). Specifically, the fineness difference between the high-strength yarn (Y1b, Y3b) and the low-strength yarn (Y1a, Y3a) may be, for example, 50 deniers or more, 100 deniers or more, 150 deniers or more, 200 deniers or more, 250 deniers or more, 300 deniers or more, 350 deniers or more, 400 deniers or more, 450 deniers or more, 500 deniers or more, 550 deniers or more, or 600 deniers or more. The upper limit of the difference in fineness between the high-strength yarn (Y1b, Y3b) and the low-strength yarn (Y1a, Y3a) can be, for example, 900 denier or less, 800 denier or less, 700 denier or less, 600 denier or less, 500 denier or less, 400 denier or less, 300 denier or less, 200 denier or less, or 100 denier or less.

[0079] In one example, the low-strength yarn (Y1a, Y3a) may refer to a fiber having a relatively lower tenacity than the high-strength yarn (Y1b, Y3b). Specifically, the low-strength yarn (Y1a, Y3a) may have a tenacity of 50% or less of the tenacity of the high-strength yarn (Y1b, Y3b). For example, when the high-strength yarn (Y1b, Y3b) has a tenacity of 30N to 50N, the low-strength yarn (Y1a, Y3a) may have a tenacity of about 50% or less of the tenacity of the high-strength yarn (Y1b, Y3b). For example, the low-strength yarn (Y1a, Y3a) may have a tenacity of about 25N or less, 20N or less, or 15N or less.

[0080] In one example, the high-strength yarn (Y1b, Y3b), the second yarn (Y2) and the fourth yarn (Y4) may be the same fiber or include the same fiber. For example, the high-strength yarn (Y1b, Y3b), the second yarn (Y2) and the fourth yarn (Y4) may have the same strength. In another example, the high-strength yarn (Y1b, Y3b), the second yarn (Y2), the fourth yarn (Y4) and the tether yarn (T) may be the same fiber or include the same fiber. For example, the high-strength yarn (Y1b, Y3b), the second yarn (Y2), the fourth yarn (Y4) and the tether yarn (T) may have the same strength. That is, the double-layer fabric according to one embodiment can be woven using high-strength yarns and low-strength yarns as the first to fourth yarns and the tether yarn.

Claims

1. A double-layer fabric comprising: a first fabric layer woven by crossing first yarns extending in a first direction with second yarns extending in a second direction; a second fabric layer woven by crossing third yarns extending in the first direction with fourth yarns extending in the second direction; and a tether yarn woven with the first yarn and the third yarn to connect the first fabric layer with the second fabric layer, wherein at least some of the first yarns and the third yarns include low-strength yarns and high-strength yarns alternately arranged in the second direction, and In the area where the tether yarn that has crossed the first yarn crosses the third yarn, the tether yarn is woven only over the low-strength yarn among the first yarns and the low-strength yarn among the third yarns.

2. The double-layer fabric according to claim 1, in, When the double-layer fabric is inflated, the low-strength yarns rupture due to the force applied to the tether yarns.

3. The double-layer fabric according to claim 1, in, There are two or more of the tether yarns.

4. The double-layer fabric according to claim 3, in, The two or more tether yarns cross each other to form an X shape between the first fabric layer and the second fabric layer when viewed from a cross section of the double-layer fabric.

5. The double-layer fabric according to claim 1, in, The first yarn is composed of low-strength yarns and high-strength yarns alternately arranged in the second direction, and crosses with the second yarn after forming a pair consisting of one of the low-strength yarns and one of the high-strength yarns, or The third yarn is composed of low-strength yarns and high-strength yarns alternately arranged in the second direction, and crosses the fourth yarn after forming a pair composed of one of the low-strength yarns and one of the high-strength yarns.

6. The double-layer fabric according to claim 1, in, The first yarns are composed of low-strength yarns and high-strength yarns alternately arranged in the second direction, and some of the first yarns cross the tether yarns after forming a pair consisting of one of the low-strength yarns and one of the high-strength yarns, or The third yarns are composed of low-strength yarns and high-strength yarns alternately arranged in the second direction, and some of the third yarns cross the tether yarns after forming a pair consisting of one of the low-strength yarns and one of the high-strength yarns.

7. The double-layer fabric according to claim 1, in, The first yarn and the third yarn are composed of low-strength yarns and high-strength yarns alternately arranged in a second direction, and the first yarn and the third yarn respectively cross the second yarn and the fourth yarn after forming a pair consisting of one low-strength yarn and one high-strength yarn; some of the first yarns cross the tether yarns after forming a pair consisting of one of the low-strength yarns and one of the high-strength yarns, and some of the third yarns cross the tether yarns after forming a pair consisting of one of the low-strength yarns and one of the high-strength yarns; and In the area where the tether yarn that has crossed the first yarn crosses the third yarn, the tether yarn is woven only over the low-strength yarn among the first yarns and the low-strength yarn among the third yarns.

8. The double-layer fabric according to claim 1, in, When the number of the high-strength yarns is n, the number of the low-strength yarns is n+1.

9. The double-layer fabric according to claim 1, in, The first yarn includes low-strength yarns and high-strength yarns alternately arranged in the second direction in some regions, and includes high-strength yarns in other regions, wherein in the some regions, the first yarn crosses with the second yarn after forming a pair consisting of one low-strength yarn and one high-strength yarn, and in the other regions, the high-strength yarn crosses with the second yarn; or The third yarn includes low-strength yarns and high-strength yarns alternately arranged in the second direction in some areas, and includes high-strength yarns in other areas, wherein in the some areas, the third yarn crosses the fourth yarn after forming a pair consisting of one low-strength yarn and one high-strength yarn, and in the other areas, the high-strength yarn crosses the fourth yarn.

10. The double-layer fabric according to claim 1, in, The first yarn includes low-strength yarns and high-strength yarns alternately arranged in the second direction in some regions, and includes high-strength yarns in other regions, wherein the first yarns as high-strength yarns cross the tether yarns in the other regions; or The third yarn includes low-strength yarns and high-strength yarns alternately arranged in the second direction in some areas, and includes high-strength yarns in other areas, wherein the third yarn as the high-strength yarn crosses the tether yarn in the other areas.

11. The double-layer fabric according to claim 1, in, The first yarn and the third yarn include low-strength yarns and high-strength yarns alternately arranged in the second direction in some areas, and include high-strength yarns in other areas, wherein in the some areas, the first yarn and the third yarn respectively cross the second yarn and the fourth yarn after forming a pair consisting of one low-strength yarn and one high-strength yarn, and in the other areas, the first yarn and the third yarn, which are high-strength yarns, respectively cross the second yarn and the fourth yarn; In the remaining area, the first yarn, which is a high-strength yarn, crosses the tether yarn, and the third yarn, which is a high-strength yarn, crosses the tether yarn; and In the area where the tether yarn that has crossed the first yarn crosses the third yarn, the tether yarn is woven only over the low-strength yarn among the first yarns and the low-strength yarn among the third yarns.

12. The double-layer fabric according to claim 1, in, The first to fourth yarns and the tether yarn each independently include one or more fibers selected from polyester fibers, polyamide fibers, aramid fibers, polyketone fibers, carbon fibers, and cellulose fibers.

13. The double-layer fabric according to claim 1, in, The low-strength yarn has a smaller fineness or lower tenacity than the high-strength yarn.

14. The double-layer fabric according to claim 1, in, The high strength yarn, the second yarn, and the fourth yarn include the same fibers.

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