CN116536843A - Warp-knitted spacer fabric extending in longitudinal and transverse directions - Google Patents
Warp-knitted spacer fabric extending in longitudinal and transverse directions Download PDFInfo
- Publication number
- CN116536843A CN116536843A CN202310582283.4A CN202310582283A CN116536843A CN 116536843 A CN116536843 A CN 116536843A CN 202310582283 A CN202310582283 A CN 202310582283A CN 116536843 A CN116536843 A CN 116536843A
- Authority
- CN
- China
- Prior art keywords
- warp
- longitudinal
- spacer
- layer
- transverse
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 125000006850 spacer group Chemical group 0.000 title claims abstract description 121
- 239000004744 fabric Substances 0.000 title claims abstract description 74
- 238000009940 knitting Methods 0.000 claims description 47
- 238000004519 manufacturing process Methods 0.000 claims description 14
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 6
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 6
- -1 polyethylene terephthalate Polymers 0.000 claims description 5
- 239000010410 layer Substances 0.000 description 100
- 238000000034 method Methods 0.000 description 13
- 239000010985 leather Substances 0.000 description 7
- 230000003313 weakening effect Effects 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 239000002649 leather substitute Substances 0.000 description 3
- 241000218157 Aquilegia vulgaris Species 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000002346 layers by function Substances 0.000 description 2
- 239000004745 nonwoven fabric Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000009941 weaving Methods 0.000 description 2
- 239000002759 woven fabric Substances 0.000 description 2
- 238000009954 braiding Methods 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B21/00—Warp knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
- D04B21/06—Patterned fabrics or articles
- D04B21/08—Patterned fabrics or articles characterised by thread material
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B21/00—Warp knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
- D04B21/14—Fabrics characterised by the incorporation by knitting, in one or more thread, fleece, or fabric layers, of reinforcing, binding, or decorative threads; Fabrics incorporating small auxiliary elements, e.g. for decorative purposes
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
- D10B2331/04—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyesters, e.g. polyethylene terephthalate [PET]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
Abstract
The 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 warp-knitted layer and the second warp-knitted layer; the first main yarn is warp knitted between at least two spaced apart longitudinal stitches, the first main yarn being guided by a respective non-full thread bar over a predetermined longitudinal split line such that a pair of longitudinal stitches on the first warp knitted layer adjacent the predetermined longitudinal split line are connected by only a first auxiliary yarn, and the second main yarn and the second auxiliary yarn form stitches in each of the transverse stitches of the second warp knitted layer. Compared with the prior art, the warp-knitted spacer fabric has preset longitudinal breaking lines and preset transverse breaking lines, which are arranged on the surface of the warp-knitted layer, so that the uniformity of the warp-knitted fabric is enhanced.
Description
Technical Field
The present invention relates to knitted fabrics and, more particularly, to warp knit spacer fabrics extending in the machine and cross directions.
Background
In general, a spacer knitted fabric, particularly a warp knitted spacer knitted fabric provided with a knitted layer and spacer threads interposed in the knitted layer, has a good and uniform elastic property and a lightweight structure, and is therefore suitable for backing interior to some extent. For example, spacer knits are commonly used in automotive industry interior trim, typically as a wrap layer comprising a spacer knit, a cover layer (e.g., leather, synthetic leather, or decorative film) disposed over the spacer knit, and may be used to decorate the roof, instrument panel, and door sides of an automobile. Furthermore, warp-knitted spacer fabrics with a relatively high compression stiffness are often used as functional layers in ventilated seats or seat covers for motor vehicles.
When using a warp-knitted spacer fabric as a lining for an instrument panel (also referred to in practice as an instrument panel), it is necessary in the event of an accident to split the envelope layer comprising the warp-knitted spacer fabric and the cover layer in a controlled manner at the location where the airbag is placed so that the airbag can be deployed freely. Thus, for the aesthetic appearance of the vehicle body, visible seams, edges or uneven areas should be avoided at this particular location of the instrument panel airbag.
While other spacer fabrics are known in practice, the present invention is specifically directed to warp knit spacer fabrics. In order to produce woven fabrics with defined structures (as distinguished from statistical distributions in non-woven fabrics), many different weaving and knitting methods exist. In the case of knitting methods, it is necessary to distinguish between the stitch patterns, in particular weft-knitted and warp-knitted fabrics. For basic information on the corresponding techniques, reference is made to knitting techniques (second edition, david J.Spenc, pergamon Press 1989) and warp knitting techniques (second edition, D.F.paling, columbine Press 1965).
European patent (EP 1860218B 1) describes a warp-knitted spacer fabric with longitudinal breaking lines, which reduces the force consumption when pulled transversely. The spacer lines connect the longitudinal stitches on one warp knit layer with the longitudinal stitches on the other warp knit layer, and in top view, are offset from the longitudinal stitches on the first warp knit layer in an "X" overlap. The warp-knitted spacer fabric is provided with a main yarn system forming transverse stitches in the transverse direction and longitudinal stitches in the production direction, the transverse stitches and the longitudinal stitches being distributed over the whole area of the main yarn system. The weft threads which are inserted in the transverse direction and are not annular form an additional thread system, and the weft threads are connected with the longitudinal loops and have relatively low tearing strength. At the longitudinal breaking lines, adjacent longitudinal stitches are connected only by the weft, so that the spacer knitted fabric can be easily torn when the fabric is stretched at the longitudinal breaking lines. Not only the tear strength of the spacer knitted fabric is reduced, but also the leather, imitation leather or similar cover layer can effectively cover the longitudinal breaking line. The existing spacer knitted fabric can be used as a cover layer of an air bag, but the accurate positioning of the longitudinal fracture lines (usually marking the longitudinal fracture lines with colored lines) is required in the production of the interior trim, and the production workload is increased.
A warp-knitted spacer fabric having initial characteristics is disclosed in patent (US 8286451B 2). The warp-knitted spacer fabric is provided with preset longitudinal breaking lines and preset transverse breaking lines which have the same pattern.
When the loops are pulled in the machine direction (i.e. the production direction), the forces are distributed over a plurality of areas of the respective thread forming the loops, and for warp-knitted fabrics the forces are typically distributed over three areas acting in parallel, thus achieving a great tensile strength in the machine direction. According to patent US8286451B2, both warp knit layers comprise a main yarn system of main yarns and an auxiliary yarn system of relatively finer auxiliary yarns, wherein both warp knit layers comprise alternately arranged first and second transverse yarn loops: the first transverse loops comprise main and auxiliary lines each forming loops, and the second transverse loops comprise auxiliary lines forming loops and non-looped main lines, wherein the two warp knit layers have a lower tear strength than the first transverse loops in the production direction, thus providing a predetermined transverse breaking line at the second transverse loops. Existing warp knit spacer fabrics can be used as covers for airbags. However, the structure of the predetermined breaking line is visible in the wrapping layer using a specific, very thin coating.
Disclosure of Invention
The object of the present invention is to provide a warp knit spacer fabric having predetermined longitudinal and transverse breaking lines which are provided on the surface of the warp knit layer with enhanced uniformity.
The aim of the invention can be achieved by the following technical scheme:
a warp knit spacer fabric extending in a machine direction and a cross-machine direction comprising:
a first knitted layer including a transverse stitch, a longitudinal stitch, a first main line system formed by a first main line, and a first auxiliary line system formed by a first auxiliary line having a lower fineness than the first main line;
a second warp knit layer separated from the first warp knit layer and comprising transverse stitches, longitudinal stitches, a second main line system formed by a second main line, and a second auxiliary line system formed by a second auxiliary line having a lower fineness than the second main line;
a spacer layer connecting the first warp knit layer and the second warp knit layer;
the first warp knitting layer comprises first transverse loops and second transverse loops which are alternately arranged, the first transverse loops comprise first main lines which are in an annular shape and first auxiliary lines which are in an annular shape, the second transverse loops comprise first auxiliary lines which are in an annular shape and first main lines which are not in an annular shape, the tearing strength of the second transverse loops is lower than that of the first transverse loops in the production direction of the first warp knitting layer, and therefore preset transverse fracture lines are arranged on the second transverse loops, the preset longitudinal fracture lines are obtained by extending a tearing strength point weakened in the transverse direction along the longitudinal direction, and the inclined interval lines connect the longitudinal loops on the first warp knitting layer with the longitudinal loops on the second warp knitting layer which are offset from the longitudinal loops, and in a top view, the preset longitudinal fracture lines of the warp knitting fabric are free of inclined interval lines;
the first main yarn is warp knitted between the longitudinal stitches of at least two spaced apart, the first main yarn being guided by respective non-full thread bars over the predetermined longitudinal break lines such that a pair of the longitudinal stitches on the first warp knitted layer adjacent to the predetermined longitudinal break lines are connected only by the first auxiliary yarn, and the second main yarn and the second auxiliary yarn form stitches in each of the lateral stitches of the second warp knitted layer.
In one embodiment, the spacer layer comprises a first spacer system consisting of a first spacer of cylindrical shape and a second spacer system consisting of a second spacer of inclined, skipped over the preset longitudinal breaking line by a corresponding non-full thread bar guide.
In one embodiment, the second spacer wire of the second spacer wire system is knitted from one 1 full 1 empty non-full-thread bar.
In one embodiment, the first auxiliary wire, the second auxiliary wire and the spacing wire are monofilaments, and the fineness of the monofilaments is 20dtex to 45dtex.
In one embodiment, the first main yarn and the second main yarn are multifilament yarn having a fineness of 50dtex to 120dtex.
In one embodiment, the first warp knit layer, the second warp knit layer, and the spacer layer are each comprised of polyethylene terephthalate.
In one embodiment, the first main thread system, the second main thread system, the first auxiliary thread system and the second auxiliary thread system are all knitted with a 1 full 1 empty non-full-thread bar.
In one embodiment, the first main yarn forms a modified tricot pattern and the first auxiliary yarn also forms a tricot pattern.
In one embodiment, the second main line forms a diagonal pattern.
In one embodiment, the first warp knit layer, the second warp knit layer comprise 10 to 40 longitudinal stitches and 10 to 40 transverse stitches per square centimeter.
In one embodiment, the warp knit spacer fabric has a total thickness of 1mm to 10mm.
A covering for an automotive interior comprising said warp knit spacer and a cover layer attached to said warp knit spacer.
Compared with the prior art, the invention has the following advantages:
1. the warp knit has predetermined longitudinal break lines and predetermined transverse break lines disposed on the surface of the warp knit layer such that uniformity of the warp knit is enhanced.
2. The coating layer of the automotive interior has a high quality appearance. In particular, the appearance of structures on the warp-knitted spacer fabric underneath is avoided, despite the thinness of the cover layer. In the case of airbag deployment, a reliable, controlled fracture can be formed in the envelope.
Drawings
FIG. 1 is a warp knit spacer fabric formed of six bars according to the present invention.
FIG. 2 is a weave pattern formed by six bars.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following examples.
The invention relates to a warp-knitted spacer fabric extending in the longitudinal and transverse directions, comprising:
a first knitted layer including a transverse stitch, a longitudinal stitch, a first main line system formed by a first main line, and a first auxiliary line system formed by a first auxiliary line having a lower fineness than the first main line;
a second warp knit layer separated from the first warp knit layer and comprising transverse stitches, longitudinal stitches, a second main line system formed by a second main line, and a second auxiliary line system formed by a second auxiliary line having a lower fineness than the second main line;
a spacer layer connecting the first warp knit layer and the second warp knit layer;
the first warp knitting layer comprises first transverse loops and second transverse loops which are alternately arranged, the first transverse loops comprise first main lines which are annular in shape and first auxiliary lines which are annular in shape, the second transverse loops comprise first auxiliary lines which are annular in shape and first main lines which are not annular in shape, the tearing strength of the second transverse loops is lower than that of the first transverse loops in the production direction of the first warp knitting layer, the second transverse loops form preset transverse fracture lines, the preset longitudinal fracture lines are obtained by extending a tearing strength point weakened in the transverse direction along the longitudinal direction, and the longitudinal loops on the first warp knitting layer are connected with the longitudinal loops on the second warp knitting layer which are offset from the first transverse loops through inclined interval lines, and the preset longitudinal fracture lines of the warp knitting fabric are free of inclined interval lines in a top view.
In general, a spacer knitted fabric, particularly a warp knitted spacer knitted fabric provided with a knitted layer and spacer threads interposed in the knitted layer, has a good and uniform elastic property and a lightweight structure, and is therefore suitable for backing interior to some extent. For example, spacer knits are commonly used in automotive industry interior trim, typically as a wrap layer comprising a spacer knit, a cover layer (e.g., leather, synthetic leather, or decorative film) disposed over the spacer knit, and may be used to decorate the roof, instrument panel, and door sides of an automobile. Furthermore, warp-knitted spacer fabrics with a relatively high compression stiffness are often used as functional layers in ventilated seats or seat covers for motor vehicles.
When using a warp-knitted spacer fabric as a lining for an instrument panel (also referred to in practice as an instrument panel), it is necessary in the event of an accident to split the envelope layer comprising the warp-knitted spacer fabric and the cover layer in a controlled manner at the location where the airbag is placed so that the airbag can be deployed freely. Thus, for the aesthetic appearance of the vehicle body, visible seams, edges or uneven areas should be avoided at this particular location of the instrument panel airbag.
While other spacer knits are known in practice, the present invention is specifically directed to warp knit spacer knits. In order to produce woven fabrics with defined structures (as distinguished from statistical distributions in non-woven fabrics), many different weaving and knitting methods exist. In the case of knitting methods, it is necessary to distinguish between the stitch patterns, in particular weft-knitted and warp-knitted fabrics. For basic information on the corresponding techniques, reference is made to knitting techniques (second edition, david J.Spenc, pergamon Press 1989) and warp knitting techniques (second edition, D.F.paling, columbine Press 1965).
European patent (EP 1860218B 1) describes a warp-knitted spacer fabric with longitudinal breaking lines, which reduces the force consumption when pulled transversely. The spacer lines connect the longitudinal stitches on one warp knit layer with the longitudinal stitches on the other warp knit layer, and in top view, are offset from the longitudinal stitches on the first warp knit layer in an "X" overlap. The warp-knitted spacer fabric is provided with a main yarn system forming transverse stitches in the transverse direction and longitudinal stitches in the production direction, the transverse stitches and the longitudinal stitches being distributed over the whole area of the main yarn system. The weft threads which are inserted in the transverse direction and are not annular form an additional thread system, and the weft threads are connected with the longitudinal loops and have relatively low tearing strength. At the longitudinal breaking lines, adjacent longitudinal stitches are connected only by the weft, so that the spacer knitted fabric can be easily torn when the fabric is stretched at the longitudinal breaking lines. Not only the tear strength of the spacer knitted fabric is reduced, but also the leather, imitation leather or similar cover layer can effectively cover the longitudinal breaking line. The existing spacer knitted fabric can be used as a cover layer of an air bag, but the accurate positioning of the longitudinal fracture lines (usually marking the longitudinal fracture lines with colored lines) is required in the production of the interior trim, and the production workload is increased.
A warp-knitted spacer fabric having initial characteristics is disclosed in patent (US 8286451B 2). The warp-knitted spacer fabric is provided with preset longitudinal breaking lines and preset transverse breaking lines which have the same pattern.
When the loops are pulled in the machine direction (i.e. the production direction), the forces are distributed over a plurality of areas of the respective thread forming the loops, and for warp-knitted fabrics the forces are typically distributed over three areas acting in parallel, thus achieving a great tensile strength in the machine direction. According to patent US8286451B2, both warp knit layers comprise a main yarn system of main yarns and an auxiliary yarn system of relatively finer auxiliary yarns, wherein both warp knit layers comprise alternately arranged first and second transverse yarn loops: the first transverse loops comprise main and auxiliary lines each forming loops, and the second transverse loops comprise auxiliary lines forming loops and non-looped main lines, wherein the two warp knit layers have a lower tear strength than the first transverse loops in the production direction, thus providing a predetermined transverse breaking line at the second transverse loops. Existing warp knit spacer fabrics can be used as covers for airbags. However, the structure of the predetermined breaking line is visible in the wrapping layer using a specific, very thin coating.
The object of the present invention is to provide a warp knit spacer fabric having predetermined longitudinal and transverse breaking lines which are provided on the surface of the warp knit layer with enhanced uniformity.
In order to achieve this object, the invention is described starting from the initial characteristics of a warp-knitted spacer fabric, in which the first main thread is knitted on at least two longitudinal stitches spaced apart, the non-full-thread bar guides the first main thread to skip at a preset longitudinal breaking line, so that in the first warp-knitted layer a pair of longitudinal stitches adjacent to the preset longitudinal breaking line are connected only by a first auxiliary thread, the second main thread and the second auxiliary thread forming stitches on each transverse stitch on the second warp-knitted layer.
The two warp knit layers are substantially flat. The thickness of each warp knit layer is determined by the fineness of the corresponding thread, the shape of the loops, and the position of the layering of the threads. The thickness of the entire warp knit spacer knit is essentially dependent on the extension of the spacer layer between the two warp knit layers, and should be between 1mm and 10mm in total, preferably between 2mm and 6mm in total.
For warp-knitted spacer fabrics, the machine direction corresponds to the production direction, and both terms have the same meaning in the description herein.
"transverse stitches" herein refers to a row of stitches extending primarily in the transverse direction and created by adjacent knitting needles within the same warp knitting cycle. These transverse coils are connected to each other in the longitudinal direction.
"longitudinal loops" as used herein refers to a row of loops extending primarily in the longitudinal direction, consisting of continuous warp knit loops. These longitudinal coils are connected to each other in the transverse direction.
For example, in the present invention, the warp knit layer can comprise 10 to 40 transverse stitches and 10 to 40 wale stitches per square centimeter.
The term "thread" is a generic term for an elongated textile structure for knitting, and includes in particular single fibers, called monofilaments and multifilaments.
The term "fineness" is a direct measurement parameter of the linear density of the yarn, and may be expressed in tex (g/km), dtex (dec-tex, g/10 km), denier (g/9000 m), or the like. In the following technical description, dtex is used.
Since both are knitted using warp knitting processes, the average distance between adjacent longitudinal stitches on both warp knitted layers is the same as the density of the longitudinal stitches. The above units apply equally to transverse coils.
The complete warp knit spacer knit is formed in a coherent warp knitting process. Preferably, the spacer thread connects and embeds the two warp knit layers by forming a loop.
The term "thread system" refers to a group of threads interwoven by the same bar guide thread, having the same knitting pattern. Typically all wires in a wire system are identical.
The term "non-full-thread bar" means that not every knitting needle on the bar is wired. In the context of the present invention, this corresponds to the number of bars handling the thread being smaller than the number of longitudinal coils. For example, one thread is provided every 2 knitting needles. Such an embodiment is referred to as 1 full 1 empty.
The invention is based on the following recognition: it is sufficient to form the line of weakness in only one of the two warp knit layers, i.e. in the first warp knit. Preferably, due to the arrangement of the warp knit spacer fabric in the lamination and/or the different extensibility of the first warp knit layer and the second warp knit layer, only the first warp knit layer breaks first along the corresponding predetermined breaking line under a longitudinal or transverse tensile load.
For example, different stretchability may be achieved by different yarn tensions, yarn types, and warp knitting patterns.
Even if the first knitted layer does not break first along the preset breaking line as described, for the whole warp knit spacer, it is still a weak point at the preset breaking line, at which point the fabric material will eventually break.
Surprisingly, it is also sufficient to form the predetermined transverse rupture line in only one of the two warp knit layers, i.e. in the first warp knit layer, to achieve uniform tearing in many applications. For this reason, it is assumed that the weakening forces generated at the start of the tear promote a linear propagation along the predetermined breaking line, and that it is not possible for the tear line to change position to the other transverse or longitudinal coil under even stress.
In the present invention, it is generally prescribed that N (N is greater than or equal to 1) transverse coils are laid down in a uniformly repeated order with each other without weakening, and N transverse coils are laid down in a preset transverse breaking line with each other without weakening.
Accordingly, the present invention provides M (greater than or equal to 2) longitudinal coils in a longitudinal direction in a uniformly repeated order with each other without weakening, while M longitudinal coils in a preset longitudinal breaking line in a uniformly repeated order with each other without weakening.
In a preferred embodiment, M and/or N is equal to 2. For transverse loops that follow each other in the transverse direction, when M is equal to 2, the different thread systems of the present invention can each achieve a 1 full 1 empty knitting pattern from a non-full thread bar.
When N is equal to 2, there are exactly two first transverse loops and one second transverse loop in the first knitted layer in alternating order.
According to an embodiment of the invention, it is further provided that the first main thread is warp knitted between at least two spaced apart longitudinal stitches, the first main thread being guided by the respective non-full thread bar over the predetermined longitudinal split thread, such that a pair of longitudinal stitches on the first warp knitted layer adjacent to the predetermined longitudinal split thread are connected by the first auxiliary thread only. Such as the 1 full 1 empty braiding sequence described above. Thereby further, the first main thread extends at least over adjacent longitudinal loops, thereby achieving a smooth and stable surface of the first knitted layer.
Alternatively, the first auxiliary thread system is knitted from a non-full thread bar in the order 1 full 1 empty. Since the first auxiliary line is provided on the preset longitudinal fracture line, it is apparent that there is a positional offset between the first auxiliary line and the first main line. The first auxiliary wire is omitted among the longitudinal coils woven by the first main wire, and the position of the longitudinal breaking wire is not reserved. The uniformity of the first knitted layer is therefore better.
Preferably, the first knitted layer is entirely composed of the first main thread system, the first auxiliary thread system and the partly connected spacer threads.
In a preferred embodiment of the invention, the spacer layer comprises a first spacer system consisting of a first spacer wire in the form of a cylinder and a second spacer wire system consisting of a second spacer wire inclined and guided by a respective non-full thread bar to skip over the preset longitudinal breaking line. The first spacer wire can greatly improve the compression resistance and always extend along a specific longitudinal coil. The first spacer thread may be knitted by the full thread bar without compromising the function of the predetermined longitudinal breaking thread.
In contrast, the second spacer thread is inclined with respect to the lateral direction, so that the warp-knitted spacer fabric can be prevented from collapsing due to lateral toppling. Preferably, the spacer layer is formed entirely of the first spacer line system and the second spacer line system.
Preferably, the first auxiliary wire, the second auxiliary wire and the spacing wire are monofilaments, and the fineness of the monofilaments is 20 dtex-45 dtex.
Preferably, the first main yarn and/or the second main yarn is multifilament with a fineness of 50dtex to 120dtex. The multifilament yarn may comprise from 12 to 48 filaments. The multifilament yarn may be textured or non-textured.
In a preferred embodiment of the present invention, the warp knit spacer fabric is formed from a single type of polymer. The purity of the raw materials is preferably determined by the literature of the raw materials used or recovered.
For example, the entire warp knit spacer fabric may be formed from polyethylene terephthalate (PET) and is therefore suitable for use in motor vehicles, particularly as a cladding for instrument panels.
In the present invention, the second main yarn and the second auxiliary yarn constitute each transverse stitch on the second warp knit layer, and there is no predetermined transverse rupture line on the second warp knit layer.
However, on the preset longitudinal fracture line, the second main line may be omitted, and only the second auxiliary line may 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) may be knitted by the non-full thread-down bar in the order of 1 full 1 empty.
In a preferred embodiment, the first main yarn forms a modified tricot pattern and the first auxiliary yarn forms a tricot pattern. If the second main line can form a twill pattern.
In a further embodiment of the invention, a cover layer is provided over the warp knit spacer described above for the wrapping of an automotive vehicle interior lining. The cover layer may comprise leather, synthetic leather, or decorative film. In particular, the coating may be provided on an airbag of a motor vehicle such as a car.
The wrapping has a high quality appearance. In particular, the appearance of structures on the warp-knitted spacer fabric underneath is avoided, despite the thinness of the cover layer. In the case of airbag deployment, a reliable, controlled fracture can be formed in the envelope.
The invention is explained below by way of examples of embodiments.
The specific construction of the warp knit spacer fabric of the present invention can be seen from figures 1 and 2. The six guide bars are GB1, GB2, GB3, GB4, GB5 and GB6 respectively.
The guide bar GB1 is used for knitting a first main line system formed by a first main line, the guide bar GB2 is used for knitting a first auxiliary line system formed by a first auxiliary line, and the guide bar GB1 and the guide bar GB2 are jointly knitted to complete a first knitted layer.
The guide bar GB6 is used for knitting a second main line system formed by the second main lines, the guide bar GB5 is used for knitting a second auxiliary line system of the second auxiliary lines, and the guide bar GB5 and the guide bar GB6 are jointly knitted to complete a second warp knitting layer.
The guide bar GB4 is used for knitting a first spacing line system composed of columnar first spacing lines, the guide bar GB3 is used for knitting a second spacing line system composed of second spacing lines, and the second spacing lines are inclined as shown in figure 2.
As shown in fig. 1, only the guide bar GB4 is provided with a thread on each knitting needle, and the remaining guide bars are provided with a thread on only a part of the knitting needles, and the wiring sequence is 1 full and 1 empty.
In the invention, the fineness of the first auxiliary line and the second auxiliary line is lower than that of the first main line and the second main line respectively. For example, a textured multifilament yarn composed of 24 filaments with a fineness of 76dtex may be used as the first main yarn and the second main yarn. Other thread systems all use filaments with a fineness of 33 dtex.
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 cycle.
Since warp knit spacer fabrics are typically used in combination with cover layers, there is no need to provide the yarns with a specific color. The polyethylene terephthalate yarn typically used in spinning is opaque white, a color known as raw white during use. The absence of pigments and colorants facilitates the recovery of the warp-knitted spacer knit.
The reference bar GB1 and the bar GB2 form a knitting pattern, the first warp knitting layer comprises first transverse loops and second transverse loops which are alternately arranged, the first transverse loops comprise annular first main lines and annular first auxiliary lines, and the second transverse loops comprise annular first auxiliary lines and non-annular first main lines. In this particular embodiment, one second transverse coil is distributed between two first transverse coils. During the knitting of the second transverse stitch, a knitting needle guides the first main thread not to form a loop, thereby providing a predetermined transverse breaking line.
According to the guide bars GB4 and GB3 described above, the spacer layer is formed by a first spacer wire system and a second spacer wire system. In the knitting pattern formed by bar GB3, the second spacing lines are inclined to form an "X" configuration with the longitudinal direction. With this "X" configuration, two adjacent longitudinal stitches on a first warp knit layer are intimately connected with two adjacent longitudinal stitches on a second warp knit layer located therebelow. The two specific longitudinal loops are also provided with a first main yarn of the first warp knit layer and a second main yarn of the second warp knit layer. On the side of the longitudinal coil connected to the second spacing thread to form an "X" configuration, the first and second main thread skip the longitudinal coil and form a predetermined longitudinal breaking line there, thanks to the 1 full 1 empty wiring sequence on the non-full threading bars GB3, GB1 and GB6.
Claims (12)
1. A warp knit spacer fabric extending in a machine direction and a cross-machine direction comprising:
a first knitted layer including a transverse stitch, a longitudinal stitch, a first main line system formed by a first main line, and a first auxiliary line system formed by a first auxiliary line having a lower fineness than the first main line;
a second warp knit layer separated from the first warp knit layer and comprising transverse stitches, longitudinal stitches, a second main line system formed by a second main line, and a second auxiliary line system formed by a second auxiliary line having a lower fineness than the second main line;
a spacer layer connecting the first warp knit layer and the second warp knit layer;
the first warp knitting layer comprises first transverse loops and second transverse loops which are alternately arranged, the first transverse loops comprise first main lines which are in a ring shape and first auxiliary lines which are in a ring shape, the second transverse loops comprise first auxiliary lines which are in a ring shape and first main lines which are not in a ring shape, the tearing strength of the second transverse loops is lower than that of the first transverse loops in the production direction of the first warp knitting layer, the second transverse loops form preset transverse fracture lines, the preset longitudinal fracture lines are obtained by extending a tearing strength point weakened in the transverse direction along the longitudinal direction, and the inclined interval lines connect the longitudinal loops on the first warp knitting layer with the longitudinal loops on the second warp knitting layer which are offset from the longitudinal loops, and the preset longitudinal fracture lines of the warp knitting fabric are not provided with the inclined interval lines in a top view;
-characterized in that said first main thread is warp knitted between at least two spaced apart longitudinal stitches, said first main thread being guided by respective non-full thread bars over said preset longitudinal breaking lines such that a pair of said longitudinal stitches adjacent to said preset longitudinal breaking lines on said first warp knitted layer are connected by only said first auxiliary thread, and said second main thread and said second auxiliary thread form stitches in each transverse stitch of said second warp knitted layer.
2. The warp knit spacer fabric extending in the machine direction and the cross-machine direction according to claim 1, wherein said spacer layer comprises a first spacer system consisting of a first spacer of cylindrical shape and a second spacer system consisting of a second spacer of inclined shape guided by a respective non-full thread bar skipping said preset longitudinal breaking line.
3. The warp knit spacer fabric extending in the machine direction and the cross-machine direction of claim 2 wherein said second spacer threads of said second spacer thread system are knit from a 1 full 1 empty non-full-wear bar.
4. A warp knit spacer fabric extending in the machine and transverse directions according to claim 1 wherein said first auxiliary yarn, said second auxiliary yarn and said spacer yarn are monofilaments having a fineness of 20dtex to 45dtex.
5. A warp-knitted spacer fabric extending in longitudinal and transverse direction according to claim 1, wherein said first main yarn and said second main yarn are multifilament yarns each having a fineness of 50dtex to 120dtex.
6. The warp knit spacer fabric extending in both the machine direction and the cross-machine direction of claim 1 wherein said first warp knit layer, said second warp knit layer and said spacer layer are each comprised of polyethylene terephthalate.
7. The longitudinally and transversely extending warp knit spacer fabric according to claim 1, wherein said first main yarn system, said second main yarn system, said first auxiliary yarn system and said second auxiliary yarn system are each knit with a 1 full 1 empty non-full-wear bar.
8. A warp knit spacer fabric extending in the machine direction and the cross-machine direction according to claim 1 wherein said first main yarns form a modified tricot pattern and said first auxiliary yarns also form a tricot pattern.
9. A warp knit spacer fabric extending in both the machine and transverse directions according to claim 1 wherein said second main yarns form a diagonal pattern.
10. The warp knit spacer fabric extending in both the machine direction and the cross-machine direction of claim 1 wherein said first warp knit layer and said second warp knit layer comprise 10 to 40 longitudinal stitches and 10 to 40 cross-machine stitches per square centimeter.
11. A warp-knitted spacer fabric extending in the machine direction and the cross-machine direction according to claim 1, characterized in that the total thickness of the warp-knitted spacer fabric is 1 mm-10 mm.
12. A wrapping layer for automotive interiors comprising the warp knit spacer of claim 1 and a cover layer attached to the warp knit spacer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310582283.4A CN116536843A (en) | 2023-05-23 | 2023-05-23 | Warp-knitted spacer fabric extending in longitudinal and transverse directions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310582283.4A CN116536843A (en) | 2023-05-23 | 2023-05-23 | Warp-knitted spacer fabric extending in longitudinal and transverse directions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116536843A true CN116536843A (en) | 2023-08-04 |
Family
ID=87443441
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310582283.4A Pending CN116536843A (en) | 2023-05-23 | 2023-05-23 | Warp-knitted spacer fabric extending in longitudinal and transverse directions |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116536843A (en) |
-
2023
- 2023-05-23 CN CN202310582283.4A patent/CN116536843A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108251954B (en) | Spacer fabric, composite material formed with spacer fabric and use of composite material | |
| US8286451B2 (en) | Spacer textile | |
| CN101061268B (en) | Edgecomb resistant weft insertion warp knit fabric | |
| US5299435A (en) | Locked inlay knit fabrics | |
| CN101094948A (en) | Air bag fabric and inflatble elements formed therefrom | |
| KR100598449B1 (en) | Method for producing multiaxial warp knit fabric | |
| US5682771A (en) | Knitted cover | |
| WO2005092199A1 (en) | Knitted lace construction | |
| CN111850802A (en) | Spacer fabric | |
| US7549303B2 (en) | Textile-reinforced composites with high tear strength | |
| EP1236822B1 (en) | tubes for protecting cables, conduits and the like | |
| US5916273A (en) | Warp knitted plush fabric | |
| CN111850801A (en) | Composite assembly | |
| CN110662860A (en) | Double raschel fabric | |
| CN116536843A (en) | Warp-knitted spacer fabric extending in longitudinal and transverse directions | |
| CN108589015A (en) | It is a kind of based on warp beam for the warp knitted jacquard fabric manufacture craft of the three dimensional skeletal structure of yarn | |
| US20190062963A1 (en) | Knitted spacer fabric with a predetermined separation point | |
| CN110295452B (en) | Tearable spacer fabric | |
| EP0794276B1 (en) | Warp knitted textile fabric with pattern of pleated fabric sections | |
| US20100255744A1 (en) | Textile-reinforced composites with High Tear Strength | |
| CA2556612C (en) | Multiaxial complex | |
| WO2023195309A1 (en) | Method for knitting warp knitted fabric, and warp knitting machine | |
| JP6153878B2 (en) | Air belt cover | |
| EP3904577B1 (en) | Bidirectional low tearing strength spacer textile using warp knitting | |
| CN218316586U (en) | Vehicle safety air bag door hinge |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |