A warp-knitted spacer fabric extending in the longitudinal and transverse directions

Abstract

The present invention relates to a warp-knitted spacer fabric extending in the longitudinal and transverse directions, comprising a first warp-knitted layer, a second warp-knitted layer, and a spacer layer connecting the first and second warp-knitted layers. A first main thread is warp-knitted between at least two longitudinal loops spaced apart, and the first main thread is guided by a corresponding partially threaded guide bar past a predetermined longitudinal break line, so that a pair of longitudinal loops adjacent to the predetermined longitudinal break line on the first warp-knitted layer are connected only by a first auxiliary thread, and a second main thread and a second auxiliary thread form a loop in each transverse loop of the second warp-knitted layer. Compared to the prior art, this warp-knitted spacer fabric has predetermined longitudinal break lines and predetermined transverse break lines, which are arranged on the surface of the warp-knitted layer, thereby enhancing the uniformity of the warp-knitted fabric.

Description

Technical Field

[0001] The present invention relates to a knitted fabric, in particular to a warp-knitted spacer knitted fabric extending in the longitudinal direction and the transverse direction. Background Art

[0002] Generally speaking, spacer knitted fabrics, particularly warp-knitted spacer knitted fabrics featuring spaced knitted layers and spacer threads interspersed within the knitted layers, exhibit excellent, uniform elastic properties and a lightweight structure, making them suitable for use as interior linings. For example, spacer knitted fabrics are commonly used in automotive interiors. They typically consist of a wrapping layer consisting of a spacer knitted fabric and a covering layer (e.g., leather, artificial leather, or decorative film) disposed over the spacer fabric. These wrapping layers can be used to decorate vehicle roofs, dashboards, and door flanks. Furthermore, warp-knitted spacer knitted fabrics with relatively high compression stiffness are often used as functional layers in ventilated seats or seat covers in motor vehicles.

[0003] When using warp-knitted spacer fabrics as lining for instrument panels (also known in practice as dashboards), it is necessary that in the event of an accident the outer layer comprising the warp-knitted spacer fabric and the cover layer splits apart in a controlled manner at the location where the airbag is positioned, so that the airbag can deploy freely. Therefore, for the sake of aesthetics, visible seams, edges or uneven areas should be avoided at this particular location of the instrument panel airbag.

[0004] While other spacer fabrics are known in practice, the present invention is specifically directed to warp-knitted spacer fabrics. To produce textile fabrics with a defined structure (as distinct from the statistical distribution found in non-woven fabrics), a wide variety of weaving and knitting methods are available. Within the knitting process, a distinction must be made between loop-forming methods, specifically weft knitting and warp knitting. For basic information on the corresponding techniques, please refer to Knitting Technology (Second Edition, David J. Spence, Pergamon Press 1989) and Warp Knitting Technology (Second Edition, D.F. Paling, Columbine Press 1965).

[0005] European Patent No. 1860218B1 describes a warp-knitted spacer fabric with longitudinal tear lines, which reduces force consumption during transverse pulling. The spacer lines connect the longitudinal loops of one warp-knitted layer with those of another. In a top view, the spacer lines are offset from the longitudinal loops of the first warp-knitted layer, forming an "X"-shaped overlap. Because the spacer lines are not located along the longitudinal tear lines, they overlap the longitudinal loops forming the longitudinal tear lines in an "I"-shaped overlap. Warp-knitted spacer fabrics feature a main thread system that forms transverse loops in the transverse direction and longitudinal loops in the production direction. Both transverse and longitudinal loops extend over the entire main thread system. An additional thread system, consisting of non-looping weft threads interspersed transversely, connects the longitudinal loops and has relatively low tear strength. At the longitudinal tear lines, adjacent longitudinal loops are connected only by these weft threads. Therefore, the spacer fabric tears easily when the fabric is stretched at these lines. This not only reduces the tear strength of the spacer fabric, but also effectively conceals the longitudinal tear lines with a covering layer of leather, artificial leather, or the like. Existing spacer knitted fabrics can be used as the cover layer of the airbag, but when producing the interior, the longitudinal tear line needs to be accurately positioned (usually marked with a colored line), which increases the production workload.

[0006] Patent (US8286451B2) discloses a warp knitted spacer fabric with initial characteristics, wherein the warp knitted spacer fabric is provided with preset longitudinal break lines and preset transverse break lines of the same pattern.

[0007] When the coil is pulled in the longitudinal direction (i.e., the production direction), the force is distributed across multiple areas of the corresponding wire forming the coil. For warp knitted fabrics, the force is generally distributed across three areas acting in parallel, thus achieving a high tensile strength in the longitudinal direction. According to patent US8286451B2, both warp knitted layers include a main thread system consisting of a main thread and an auxiliary thread system consisting of relatively thinner auxiliary threads, wherein both warp knitted layers include alternating first transverse coils and second transverse thread coils: the first transverse coils include the main thread and the auxiliary thread, each forming a loop, and the second transverse thread coils include the auxiliary thread forming a loop and the main thread not forming a loop. In the production direction of the two warp knitted layers, the tear strength of the second transverse thread coils is lower than that of the first transverse coils, thereby providing a preset transverse breaking line in the second transverse coils. Existing warp knitted spacer fabrics can be used as covers for airbags. However, the structure of the preset breaking line is visible in the wrapping layer using a specific, extremely thin covering layer. Summary of the Invention

[0008] The object of the present invention is to provide a warp-knitted spacer fabric with predetermined longitudinal breaking lines and predetermined transverse breaking lines, wherein the breaking lines are arranged on the surface of the warp-knitted layer and the uniformity thereof is enhanced.

[0009] The purpose of the present invention can be achieved by the following technical solutions:

[0010] A warp-knitted spacer fabric extending in longitudinal and transverse directions, comprising:

[0011] a first warp knitted layer, the first warp knitted layer comprising transverse loops, longitudinal loops, a first main thread system formed by a first main thread, and a first auxiliary thread system formed by a first auxiliary thread having a thinness lower than that of the first main thread;

[0012] a second warp knitted layer, the second warp knitted layer being separated from the first warp knitted layer and comprising transverse loops, longitudinal loops, a second main thread system formed of a second main thread, and a second auxiliary thread system formed of a second auxiliary thread having a thinness lower than that of the second main thread;

[0013] a spacer layer connecting the first warp knitted layer and the second warp knitted layer;

[0014] The first warp knitted layer includes alternately arranged first transverse coils and second transverse coils, the first transverse coils including a first main thread in a loop and a first auxiliary thread in a loop, and the second transverse coils including a first auxiliary thread in a loop and a first main thread that is not in a loop. In the production direction of the first warp knitted layer, the tear strength of the second transverse coils is lower than that of the first transverse coils, so a preset transverse rupture line is provided on the second transverse coils, the preset longitudinal rupture line is obtained by extending along the longitudinal direction a point where the tear strength is weakened in the transverse direction, an inclined spacer line connects the longitudinal coils on the first warp knitted layer and the longitudinal coils on the second warp knitted layer offset therefrom, and in a top view, there is no inclined spacer line on the preset longitudinal rupture line of the warp knitted fabric;

[0015] The first main thread is warp-knitted between at least two of the longitudinal loops, and the first main thread is guided by a corresponding non-full-penetration comb bar to skip over the preset longitudinal break line, so that a pair of the longitudinal loops adjacent to the preset longitudinal break line on the first warp-knitted layer are connected only by the first auxiliary thread, and the second main thread and the second auxiliary thread form a loop in each transverse loop of the second warp-knitted layer.

[0016] In one embodiment, the spacer layer includes a first spacer line system and a second spacer line system, wherein the first spacer line system is composed of columnar first spacer lines, and the second spacer line system is composed of inclined second spacer lines that are guided by corresponding non-full-penetration combs to pass over the preset longitudinal fracture lines.

[0017] In one embodiment, the second spacer threads of the second spacer thread system are woven by a non-full-thread comb bar with 1 full and 1 empty pattern.

[0018] In one embodiment, the first auxiliary thread, the second auxiliary thread and the spacer thread are all monofilaments with a fineness of 20 dtex to 45 dtex.

[0019] In one embodiment, the first main thread and the second main thread are both multifilaments with a fineness of 50 dtex to 120 dtex.

[0020] In one embodiment, the first warp knitted layer, the second warp knitted layer and the spacer layer are all made of polyethylene terephthalate.

[0021] In one embodiment, the first main line system, the second main line system, the first auxiliary line system and the second auxiliary line system are all woven using a non-full-thread comb with 1 full and 1 empty.

[0022] In one embodiment, the first main yarn forms a modified tricot pattern, and the first auxiliary yarn also forms a tricot pattern.

[0023] In one embodiment, the second main lines form a diagonal pattern.

[0024] In one embodiment, the first warp knitted layer and the second warp knitted layer include 10 to 40 longitudinal coils and 10 to 40 transverse coils per square centimeter.

[0025] In one embodiment, the total thickness of the warp-knitted spacer fabric is 1 mm to 10 mm.

[0026] A wrapping layer for motor vehicle interior comprises the warp-knitted spacer fabric and a covering layer connected to the warp-knitted spacer fabric.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] 1. The warp knitted fabric has preset longitudinal rupture lines and preset transverse rupture lines, which are arranged on the surface of the warp knitted layer, so that the uniformity of the warp knitted fabric is enhanced.

[0029] 2. The wrapping layer of the motor vehicle interior has a high-quality appearance. In particular, despite the thinness of the covering layer, the structure of the warp-knitted spacer fabric below is prevented from showing. In the event of airbag deployment, a reliable and controlled crack can be formed in the wrapping layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a warp-knitted spacer knitted fabric formed by six comb bars in the present invention.

[0031] Figure 2A weaving pattern formed by six comb bars. DETAILED DESCRIPTION

[0032] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0033] The present invention relates to a warp-knitted spacer fabric extending in the longitudinal direction and the transverse direction, comprising:

[0034] a first warp knitted layer, the first warp knitted layer comprising transverse loops, longitudinal loops, a first main thread system formed by a first main thread, and a first auxiliary thread system formed by a first auxiliary thread having a thinness lower than that of the first main thread;

[0035] a second warp knitted layer, the second warp knitted layer being separated from the first warp knitted layer and comprising transverse loops, longitudinal loops, a second main thread system formed of a second main thread, and a second auxiliary thread system formed of a second auxiliary thread having a thinness lower than that of the second main thread;

[0036] a spacer layer connecting the first warp knitted layer and the second warp knitted layer;

[0037] In which, the first warp knitted layer includes a first transverse coil and a second transverse coil alternately arranged, the first transverse coil includes a first main line in a ring shape and a first auxiliary line in a ring shape, the second transverse coil includes a first auxiliary line in a ring shape and a first main line that is not in a ring shape, in the production direction of the first warp knitted layer, the tear strength of the second transverse coil is lower than that of the first transverse coil, so that a preset transverse rupture line is formed on the second transverse coil, and the preset longitudinal rupture line is obtained by extending the tear strength point weakened in the transverse direction along the longitudinal direction, and the inclined spacer line connects the longitudinal coil on the first warp knitted layer and the longitudinal coil on the second warp knitted layer offset therefrom, and in the top view, there is no inclined spacer line on the preset longitudinal rupture line of the warp knitted fabric.

[0038] Generally speaking, spacer knitted fabrics, particularly warp-knitted spacer knitted fabrics featuring spaced knitted layers and spacer threads interspersed within the knitted layers, exhibit excellent, uniform elastic properties and a lightweight structure, making them suitable for use as interior linings. For example, spacer knitted fabrics are commonly used in automotive interiors. They typically consist of a wrapping layer consisting of a spacer knitted fabric and a covering layer (e.g., leather, artificial leather, or decorative film) disposed over the spacer fabric. These wrapping layers can be used to decorate vehicle roofs, dashboards, and door flanks. Furthermore, warp-knitted spacer knitted fabrics with relatively high compression stiffness are often used as functional layers in ventilated seats or seat covers in motor vehicles.

[0039] When using warp-knitted spacer fabrics as lining for instrument panels (also known in practice as dashboards), it is necessary that in the event of an accident the outer layer comprising the warp-knitted spacer fabric and the cover layer splits apart in a controlled manner at the location where the airbag is positioned, so that the airbag can deploy freely. Therefore, for the sake of aesthetics, visible seams, edges or uneven areas should be avoided at this particular location of the instrument panel airbag.

[0040] While other spacer knits are known in practice, the present invention is specifically directed to warp-knitted spacer knits. Many different weaving and knitting methods exist to produce textile fabrics with a defined structure (as distinct from the statistical distribution found in non-woven fabrics). Among the knitting methods, a distinction must be made between loop-forming methods, specifically weft knits and warp knits. For basic information on the corresponding techniques, please refer to Knitting Technology (Second Edition, David J. Spence, Pergamon Press 1989) and Warp Knitting Technology (Second Edition, D.F. Paling, Columbine Press 1965).

[0041] European Patent No. 1860218B1 describes a warp-knitted spacer fabric with longitudinal tear lines, which reduces force consumption during transverse pulling. The spacer lines connect the longitudinal loops of one warp-knitted layer with those of another. In a top view, the spacer lines are offset from the longitudinal loops of the first warp-knitted layer, forming an "X"-shaped overlap. Because the spacer lines are not located along the longitudinal tear lines, they overlap the longitudinal loops forming the longitudinal tear lines in an "I"-shaped overlap. Warp-knitted spacer fabrics feature a main thread system that forms transverse loops in the transverse direction and longitudinal loops in the production direction. Both transverse and longitudinal loops extend over the entire main thread system. An additional thread system, consisting of non-looping weft threads interspersed transversely, connects the longitudinal loops and has relatively low tear strength. At the longitudinal tear lines, adjacent longitudinal loops are connected only by these weft threads. Therefore, the spacer fabric tears easily when the fabric is stretched at these lines. This not only reduces the tear strength of the spacer fabric, but also effectively conceals the longitudinal tear lines with a covering layer of leather, artificial leather, or the like. Existing spacer knitted fabrics can be used as the cover layer of the airbag, but when producing the interior, the longitudinal tear line needs to be accurately positioned (usually marked with a colored line), which increases the production workload.

[0042] Patent (US8286451B2) discloses a warp knitted spacer fabric with initial characteristics, wherein the warp knitted spacer fabric is provided with preset longitudinal break lines and preset transverse break lines of the same pattern.

[0043] When the coil is pulled in the longitudinal direction (i.e., the production direction), the force is distributed across multiple areas of the corresponding wire forming the coil. For warp knitted fabrics, the force is generally distributed across three areas acting in parallel, thus achieving a high tensile strength in the longitudinal direction. According to patent US8286451B2, both warp knitted layers include a main thread system consisting of a main thread and an auxiliary thread system consisting of relatively thinner auxiliary threads, wherein both warp knitted layers include alternating first transverse coils and second transverse thread coils: the first transverse coils include the main thread and the auxiliary thread, each forming a loop, and the second transverse thread coils include the auxiliary thread forming a loop and the main thread not forming a loop. In the production direction of the two warp knitted layers, the tear strength of the second transverse thread coils is lower than that of the first transverse coils, thereby providing a preset transverse breaking line in the second transverse coils. Existing warp knitted spacer fabrics can be used as covers for airbags. However, the structure of the preset breaking line is visible in the wrapping layer using a specific, extremely thin covering layer.

[0044] The object of the present invention is to provide a warp-knitted spacer fabric with predetermined longitudinal breaking lines and predetermined transverse breaking lines, wherein the breaking lines are arranged on the surface of the warp-knitted layer and the uniformity thereof is enhanced.

[0045] To achieve this purpose, the present invention starts with the initial characteristics of the warp-knitted spacer fabric, in which the first main thread is woven on at least two longitudinal coils spaced apart, and the non-full-penetration comb guides the first main thread to skip over the preset longitudinal break line, so that in the first warp-knitted layer, a pair of longitudinal coils adjacent to the preset longitudinal break line are connected only by the first auxiliary thread, and the second main thread and the second auxiliary thread form coils on each transverse coil on the second warp-knitted layer.

[0046] The two warp knitted layers are essentially flat. The thickness of each warp knitted layer is determined by the fineness of the corresponding yarn, the shape of the loops, and the stacking position of the yarns. The thickness of the entire warp knitted spacer fabric is essentially determined by the extension of the spacer layer between the two warp knitted layers. The total thickness should be between 1mm and 10mm, preferably between 2mm and 6mm.

[0047] For warp-knitted spacer fabrics, the longitudinal direction corresponds to the production direction, and both terms have the same meaning in this description.

[0048] Herein, "transverse loops" refer to a row of loops extending primarily in the transverse direction and produced by adjacent knitting needles within the same warp knitting cycle. These transverse loops are interconnected in the longitudinal direction.

[0049] The term "longitudinal loop" as used herein refers to a row of loops extending primarily in the longitudinal direction, consisting of continuous warp knitted loops. These longitudinal loops are interconnected in the transverse direction.

[0050] For example, in the present invention, the warp knitted layer may include 10 to 40 transverse stitches and 10 to 40 wale stitches per square centimeter.

[0051] The term "thread" is a general term for elongated textile structures for knitting, including in particular single fibers, known as monofilaments and multifilaments.

[0052] The term "fineness" is a direct measurement parameter of the linear density of a yarn, and can be expressed in units such as tex (grams per kilometer), dtex (deci-tex, grams per 10 kilometers) or denier (grams per 9000 meters). In the following technical descriptions, dtex is used.

[0053] Since both are knitted using warp knitting technology, the average distance between adjacent longitudinal coils on the two warp knitted layers is the same as the density of the longitudinal coils. The above units also apply to the transverse coils.

[0054] The complete warp knitted spacer fabric is formed in a continuous warp knitting process. Preferably, the spacer threads connect the two warp knitted layers by forming loops and are embedded therein.

[0055] The term "thread system" refers to a group of threads interwoven by the same guide bar, with the same weaving pattern. Usually all threads in a thread system are identical.

[0056] The term "partially fully threaded bar" means that not every knitting needle on the bar is threaded. In the context of the present invention, this means that the number of threads handled by the bar is less than the number of longitudinal stitches. For example, one thread is provided for every two knitting needles. This embodiment is called "1 full, 1 empty."

[0057] The invention is based on the recognition that it is sufficient to form a weakening line in only one of the two warp-knitted layers, namely in the first warp-knitted fabric. Preferably, due to the arrangement of the warp-knitted spacer fabrics in the laminate and / or the different extensibility of the first and second warp-knitted layers, only the first warp-knitted layer breaks first under longitudinal or transverse tensile load along the corresponding predetermined breaking line.

[0058] For example, different stretch properties can be achieved through different yarn tensions, yarn types and warp knitting patterns.

[0059] Even if the first warp knitted layer is not first broken along the predetermined breaking lines as described, there are still weak points at the predetermined breaking lines for the entire warp knitted spacer fabric, and the fabric material at these weak points will eventually break.

[0060] Surprisingly, the presence of a predetermined transverse tear line in only one of the two warp-knitted layers—the first warp-knitted layer—is sufficient to achieve uniform tearing in many applications. This is based on the assumption that the weakening force generated at the onset of tearing promotes linear propagation along the predetermined tear line. Under uniform force, the tear line is unlikely to change position to another transverse or longitudinal loop.

[0061] In the present invention, it is generally provided that N (N is greater than or equal to 1) transverse coils are arranged in a uniformly repeated sequence along the longitudinal direction without weakening, and the N transverse coils are arranged along a preset transverse rupture line without weakening.

[0062] Accordingly, the present invention sets M (greater than or equal to 2) longitudinal coils in a uniformly repeated sequence and follows each other without weakening. At the same time, the M longitudinal coils follow each other in a uniformly repeated sequence along the preset longitudinal break line without weakening.

[0063] In a preferred embodiment, M and / or N is equal to 2. For transverse stitches that follow each other in the transverse direction, when M is equal to 2, different thread systems of the present invention can all achieve a 1-full-1-empty knitting mode using a non-full-threaded bar.

[0064] When N is equal to 2, in the first warp-knitted layer, there are exactly two first transverse stitches and one second transverse stitch occurring in alternating order.

[0065] According to an embodiment of the present invention, the first main thread is further provided to be warp-knitted between at least two longitudinal stitches spaced apart. The first main thread is guided by a corresponding partially-threaded guide bar past a predetermined longitudinal break line, such that a pair of longitudinal stitches adjacent to the predetermined longitudinal break line in the first warp-knitted layer are connected only by the first auxiliary thread. This is an example of the "one full and one empty" knitting sequence described above. Furthermore, the first main thread extends over at least adjacent longitudinal stitches, thereby achieving a smooth and stable surface for the first warp-knitted layer.

[0066] Optionally, the first auxiliary yarn system is knitted using a partially filled bar with a one-full and one-empty arrangement. Because the first auxiliary yarn is positioned along a predetermined longitudinal break line, there is a noticeable positional offset between the first auxiliary yarn and the first main yarn. The first auxiliary yarn is omitted between the longitudinal loops formed by the first main yarn, leaving no longitudinal break line. Consequently, the first warp-knitted layer exhibits improved uniformity.

[0067] Preferably, the first warp knitted layer is completely composed of the first main thread system, the first auxiliary thread system and partially connected spacer threads.

[0068] In a preferred embodiment of the present invention, the spacer layer comprises a first spacer thread system and a second spacer thread system. The first spacer thread system comprises first cylindrical spacer threads, while the second spacer thread system comprises second inclined spacer threads that are guided by corresponding non-fully threaded bars past the predetermined longitudinal break lines. The first spacer threads significantly enhance compressive strength and always extend along specific longitudinal loops. Without compromising the functionality of the predetermined longitudinal break lines, the first spacer threads can be woven using fully threaded bars.

[0069] In contrast, the second spacer threads are inclined relative to the transverse direction, thereby preventing the warp knitted spacer fabric from collapsing due to transverse tilting. Preferably, the spacer layer is completely formed by the first spacer thread system and the second spacer thread system.

[0070] Preferably, the first auxiliary wire, the second auxiliary wire and the spacer wire are all monofilaments with a fineness of 20 dtex to 45 dtex.

[0071] Preferably, the first main yarn and / or the second main yarn is a multifilament yarn with a fineness of 50 dtex to 120 dtex. The multifilament yarn may include 12 to 48 filaments. The multifilament yarn may be a textured yarn or a non-textured yarn.

[0072] In a preferred embodiment of the present invention, the warp knitted spacer fabric is formed from a single type of polymer. According to the literature records of the raw materials used or recycled, the purity of the raw materials is preferably good.

[0073] For example, the entire warp-knitted spacer fabric can be formed from polyethylene terephthalate (PET) and thus be suitable for use in motor vehicles, in particular as a wrapping for instrument panels.

[0074] In the present invention, the second main thread and the second auxiliary thread constitute each transverse loop on the second warp knitted layer, and no preset transverse rupture line exists on the second warp knitted layer.

[0075] However, at the predetermined longitudinal break line, the second main thread can be omitted and only the second auxiliary thread can be provided. For example, the second main thread system and the second auxiliary thread system (corresponding to the first main thread system and the first auxiliary thread system) can both be woven by a non-full-threaded comb bar in the order of 1 full and 1 empty.

[0076] In a preferred embodiment, the first main thread forms a modified tricot pattern and the first auxiliary thread forms a tricot pattern. For example, the second main thread may form a twill pattern.

[0077] In a further embodiment of the present invention, a covering layer is provided on the aforementioned warp-knitted spacer fabric, used as a wrapping layer for a motor vehicle interior lining. The covering layer may comprise leather, artificial leather, or a decorative film. In particular, the wrapping layer may be provided on an airbag in a motor vehicle such as a sedan.

[0078] The covering layer has a high-quality appearance. In particular, despite the thinness of the covering layer, the underlying warp-knitted spacer fabric structure is prevented from showing through. In the event of airbag deployment, a reliable, controlled tear can be formed in the covering layer.

[0079] The invention is explained below by way of examples of embodiment.

[0080] from Figure 1 and Figure 2 It can be seen that the specific structure of the warp knitted spacer fabric of the present invention is as follows: the six comb bars are GB1, GB2, GB3, GB4, GB5 and GB6.

[0081] The comb bar GB1 is used for weaving a first main line system composed of a first main line, and the comb bar GB2 is used for weaving a first auxiliary line system composed of a first auxiliary line. The comb bars GB1 and GB2 jointly weave a first warp knitted layer.

[0082] The comb bar GB6 is used for weaving the second main line system composed of the second main line, and the comb bar GB5 is used for weaving the second auxiliary line system composed of the second auxiliary line. The comb bars GB5 and GB6 jointly weave the second warp knitting layer.

[0083] The comb bar GB4 is used to weave a first spacer wire system composed of a columnar first spacer wire, and the comb bar GB3 is used to weave a second spacer wire system composed of a second spacer wire. Figure 2 As shown, the second spacing line is inclined.

[0084] like Figure 1 As shown, only the comb bar GB4 is equipped with thread on each knitting needle, and only some of the knitting needles of the other comb bars are equipped with thread, and the thread arrangement sequence is 1 full and 1 empty.

[0085] In the present invention, the first and second auxiliary yarns are thinner than the first and second main yarns, respectively. For example, a textured multifilament yarn with a fineness of 76 dtex, consisting of 24 filaments, can be used as the first and second main yarns. All other yarn systems use monofilament yarns with a fineness of 33 dtex.

[0086] All parts of the warp-knitted spacer fabric consist of polyethylene terephthalate and are therefore very easy to recycle at the end of the product life cycle.

[0087] Because warp-knitted spacer fabrics are often combined with a covering layer, there's no need for a specific yarn color. The polyethylene terephthalate yarn typically used in spinning is an opaque white, a color often referred to as "virgin white." The lack of pigments and colorants also facilitates the recycling of warp-knitted spacer fabrics.

[0088] Referring to the knitting pattern formed by guide bars GB1 and GB2, the first warp-knitted layer comprises alternating first and second transverse loops. The first transverse loops comprise a looped first main yarn and a looped first auxiliary yarn, while the second transverse loops comprise a looped first auxiliary yarn and a non-looped first main yarn. In this embodiment, a second transverse loop is positioned between two first transverse loops. During the knitting of the second transverse loops, a knitting needle guides the first main yarn out of looping, thereby providing a predetermined transverse break line.

[0089] According to the above-mentioned comb bars GB4 and GB3, the spacer layer is formed by a first spacer line system and a second spacer line system. In the knitting pattern formed by the comb bar GB3, the second spacer line is inclined and forms an "X" configuration with the longitudinal direction. Through this "X" configuration, the two adjacent longitudinal coils on the first warp knitted layer are tightly connected with the two adjacent longitudinal coils on the second warp knitted layer located thereunder. The first main line of the first warp knitted layer and the second main line of the second warp knitted layer are also provided on these two specific longitudinal coils. On the side of the longitudinal coil connected to the second spacer line to form an "X" configuration, due to the 1 full and 1 empty wiring sequence on the non-full-penetration comb bars GB3, GB1 and GB6, the first main line and the second main line skip over the longitudinal coil and form a preset longitudinal break line there.

Claims

1. A warp-knitted spacer fabric extending in longitudinal and transverse directions, comprising: a first warp knitted layer, the first warp knitted layer comprising transverse loops, longitudinal loops, a first main thread system formed by a first main thread, and a first auxiliary thread system formed by a first auxiliary thread having a thinness lower than that of the first main thread; a second warp knitted layer, the second warp knitted layer being separated from the first warp knitted layer and comprising transverse loops, longitudinal loops, a second main thread system formed of a second main thread, and a second auxiliary thread system formed of a second auxiliary thread having a thinness lower than that of the second main thread; a spacer layer connecting the first warp knitted layer and the second warp knitted layer; wherein the first warp knitted layer comprises alternating first transverse coils and second transverse coils, the first transverse coils comprising a first main thread in a loop and a first auxiliary thread in a loop, the second transverse coils comprising a first auxiliary thread in a loop and a first main thread that is not looped, the second transverse coils having a lower tear strength than the first transverse coils in the production direction of the first warp knitted layer, such that a predetermined transverse rupture line is formed on the second transverse coils, the predetermined longitudinal rupture line being derived from a point where the tear strength is weakened in the transverse direction and extending along the longitudinal direction, the inclined spacer lines connecting the longitudinal coils on the first warp knitted layer and the longitudinal coils on the second warp knitted layer offset therefrom, and no inclined spacer lines being present on the predetermined longitudinal rupture line of the warp knitted fabric in a top view; It is characterized in that the first main thread is warp-knitted between at least two of the longitudinal coils spaced apart, and the first main thread is guided by the corresponding non-full-thread comb bar to skip over the preset longitudinal break line, so that a pair of the longitudinal coils adjacent to the preset longitudinal break line on the first warp-knitted layer are connected only by the first auxiliary thread, and the second main thread and the second auxiliary thread form coils in each transverse coil of the second warp-knitted layer; the first main thread system, the second main thread system, the first auxiliary thread system and the second auxiliary thread system are all woven with a non-full-thread comb bar with 1 full and 1 empty, so that the first main thread extends at least on adjacent longitudinal coils, and the first main thread system corresponds to the second main thread system, the first auxiliary thread system corresponds to the second auxiliary thread system, and the spacer thread of the spacer layer connects the two warp-knitted layers by forming coils and is embedded in them.

2. A warp-knitted spacer fabric extending in the longitudinal and transverse directions according to claim 1, characterized in that: The spacer layer includes a first spacer line system and a second spacer line system, wherein the first spacer line system is composed of columnar first spacer lines, and the second spacer line system is composed of inclined second spacer lines guided by corresponding non-full penetration combs to skip the preset longitudinal fracture lines.

3. A warp-knitted spacer fabric extending in the longitudinal and transverse directions according to claim 2, characterized in that: The second spacer threads of the second spacer thread system are woven by a non-full-thread comb bar with 1 full and 1 empty pattern.

4. The warp-knitted spacer fabric extending in the longitudinal and transverse directions according to claim 1, characterized in that: The first auxiliary thread, the second auxiliary thread and the spacer thread are all monofilaments with a fineness of 20 dtex to 45 dtex.

5. The warp-knitted spacer fabric extending in the longitudinal and transverse directions according to claim 1, characterized in that: The first main thread and the second main thread are both multifilaments with a fineness of 50 dtex to 120 dtex.

6. The warp-knitted spacer fabric extending in the longitudinal and transverse directions according to claim 1, characterized in that: The first warp knitted layer, the second warp knitted layer and the spacer layer are all composed of polyethylene terephthalate.

7. The warp-knitted spacer fabric extending in the longitudinal direction and the transverse direction according to claim 1, characterized in that: The first main yarn forms a modified tricot pattern, and the first auxiliary yarn also forms a tricot pattern.

8. The warp-knitted spacer fabric extending in the longitudinal and transverse directions according to claim 1, characterized in that: The second main lines form a diagonal pattern.

9. The warp-knitted spacer fabric extending in the longitudinal direction and the transverse direction according to claim 1, characterized in that: The first warp knitted layer and the second warp knitted layer include 10 to 40 longitudinal coils and 10 to 40 transverse coils per square centimeter.

10. The warp-knitted spacer fabric extending in the longitudinal direction and the transverse direction according to claim 1, characterized in that: The total thickness of the warp-knitted spacer fabric is 1 mm to 10 mm.

11. A wrapping layer for an interior of a motor vehicle, characterized in that: The invention comprises the warp-knitted spacer fabric according to claim 1 and a covering layer connected to the warp-knitted spacer fabric.

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