DE102008033584A1 - Spacer fabric for use in e.g. seat of motor vehicle, has spacer threads distributed over width of fabric in production direction, converted into inclined part, and omitted in area of weft threads of low tensile strength - Google Patents

Abstract

The fabric (11) has two fabric layers (12, 13) lying parallel to each other, and connected with each other by spacer threads (25) that run back and forth between the layers. The layers have meshes (22, 23) running in production direction. Weft threads (15', 16') of low tensile strength are incorporated in one of the layers for producing a reference separation point. The spacer threads are distributed over width of the fabric in the production direction, and converted into an inclined part (25). The spacer threads are omitted in an area of the weft threads of low tensile strength.

Description

The The invention relates to a spacer fabric consisting of two parallel to each other lying fabric layers, by between the two Gewirelagen back and forth extending spacer threads together are connected, wherein the fabric layers generally in the production direction running stitches and thus forfeited weft threads and wherein the spacer threads are generally in the production direction run and forfeited with the Gewirkelagen, in at least one of the fabric layers at least one weft of lesser Tear strength to produce a substantially linear incorporated in the direction of production Sollpunkt is and wherein in the range of at least one weft of lesser tear resistance an omission at least a spacer thread is provided. The invention includes a cover material with a cover layer and a lining from a spacer knitted fabric, consisting of two parallel to each other lying knitted fabric layers through through the two knitted fabric layers and forth running spacer threads interconnected are, with the fabric layers generally running in the direction of production Have stitches and thus forfeit weft threads and wherein the spacer threads are generally in the direction of production run and forfeited with the Gewirkelagen, in at least one of the fabric layers at least one weft of lesser Tear strength to produce a substantially linear incorporated in the direction of production Sollpunkt is, and wherein in the range of at least one weft of lesser tear resistance an omission at least a spacer thread is provided.

Products of the type mentioned above are in the DE 10 2006 023 356 A2 described. The spacer threads running generally in the direction of production form, with the knitted fabric layers in each case, connections which are also referred to as mesh heads. The individual spacer threads here can move back and forth transversely between the knitted layers in the knitted fabric layers relative to the production direction as they move back and forth, with a structure of self-intersecting spacer threads being obtained in the direction of production. The mesh heads of a spacer thread lie in each of the fabric layers on two mutually parallel lines, the mesh heads of the two lines in the two fabric layers in plan view of the spacer fabric superimposed. This is called X-laying. Alternatively, the spacer threads may form substantially point-like connections with the latter when moving back and forth between the knitted layers, wherein, viewed in the direction of production, there is a structure of aligned spacer threads aligned at right angles to the knitted layers. The mesh heads of a spacer thread lie in each of the knitted layers on a line, the two lines in the two fabric layers superimposed in plan view of the spacer knitted fabric. This is called I-Legung.

at Abstandsgewirken consists of spacer threads in pure I-Legung the danger of a squeezing of the two knitted layers under the same direction folding the spacer threads. It will Therefore already spacer knitted fabric with a combination of spacer threads manufactured in I-lapping and spacer threads in X-lapping. Here, preferably, the two types of planting change in the direction of production considered over the width of the spacer knit.

spacer of the type mentioned become a large proportion of thermoplastic synthetic threads manufactured, with the two fabric layers mostly made of multifilaments and the spacer threads mostly consist of monofilaments. The distance act be in one by the production width of the machine used or by the intended use width as continuous Produced web material. The material is used for finishing separated with circular knives or by punching. This is in particular before rolling up the web material, the non-useable edge area thermally separated. Regardless of the preferred here mentioned type of thread of the thermoplastic synthetic threads However, the invention extends without limitation on spacer knitted fabric of thread material made of thermally stable threads.

The Upholstery fabrics of the type mentioned above, which have a cover layer, which is lined with spacer knit, are varied in the automotive sector as cover fabrics for vehicle seats, but also as upholstery for dashboards and others Interior panels used. The cover material of this kind is by laminating web material made of textile material or of homogeneous material such as leather or plastic on the web material the spacer knitted fabric, so that the starting material initially present as web material. After an alternative Type of production is thermoplastic in situ to Production of the cover material on the spacer knitted fabric "painted".

From the DE 102 60 694 A1 is a composite of strip-shaped three-dimensional textile fabrics (spacer knits) known in which the individual longitudinal strips are made with stable longitudinal edges and are separably connected by divergently incorporated separating threads between the fabric layers. The corresponding Her Setting method is intended to produce multiple elastic bandages in a single operation, which are separated by finishing steps in a subsequent separation process. A homogeneous behavior of the intermediate product of interconnected longitudinal strips is not expected.

Of the present invention is based on the object, the products of to provide said type, which is a simplified separation of the Allow material along predetermined separation points, the Material also before separation as homogeneous as possible restoring behavior should have after pressure. The Solltrennstelle should preferably not Mark on the fabric surfaces.

The solution for this lies in a spacer fabric consisting of two fabric layers lying parallel to one another, which are connected to one another by spacer threads running back and forth between the two fabric layers,
wherein the fabric layers generally have in the direction of production running stitches and thus verwitzed weft threads and
wherein the spacer threads are generally in the direction of production and are connected to the knitted fabric layers,
wherein in at least one of the fabric layers at least one weft thread of lower tear strength is incorporated to produce a substantially linear in the direction of production targeted separation point and wherein in the region of the at least one weft thread of lower tear resistance an omission of at least one spacer thread is provided, which is characterized in that Seen in the direction of production, spacer threads, distributed over the width of the spacer knit, are at least partially processed in I-lapping and at least partially in skew, and
that in the region of the at least one weft thread of lesser tear strength is an omission of a spacer thread in skew between two spacer threads in I-Legung provided. The mesh heads of a spacer yarn in I-Legung lie in each of the fabric layers on a straight line, the mesh heads of the two lines in the two fabric layers superimposed in plan view of the spacer knitted fabric. The mesh heads of a spacer thread in skew lie in the two fabric layers on a straight line, the two lines are offset in the two fabric layers transversely to the production direction to each other, so that the mesh heads of the two lines in the two fabric layers in plan view of the spacer fabric to each other lie parallel. Viewed in the production direction, the spacer threads form a sawtooth arrangement. The term ripcords of lower tear strength means that a ripcord thread has a lower tear strength, as the other unspecified weft yarns of the same knitted fabric. Tear strength is the force at which a thread tears under axial load. Corresponding experimental conditions are known to the person skilled in the art. Since only a relative tear strength is defined here, each test setup is suitable for determining the tensile strength. The tear strength is determined by the material and / or the thickness and / or the structure of a thread.

Around the Solltrennstelle particularly clearly out, is preferably provided that in each of the two fabric layers in coincident congruent position in plan view at least one weft thread of each of the spacer knitted fabrics lower tensile strength to produce the predetermined breaking point T is incorporated.

Especially favorable effects in terms of uniformity Compressive hardness of the spacer knitted fabric before separating achieved in that according to the invention along in addition to the omission of a distance thread in skew each a spacer thread is incorporated in pressure-stable I-Legung.

There the spacer threads adjacent to the omission of the one spacer thread processed in I-Legung, arises each one locally sufficient compression hardness, a homogeneous compression hardness of the spacer knit and a homogeneous surface structure to ensure the fabric layers.

For the wefts of lower tear strength (Rip threads) are preferably thinner Threads, z. As polyester, with a thickness of less while 40 dTex, in particular less than 30 dTex suggested for the unspecified weft threads greater tear strength (resistance threads) Threads, z. B. also made of polyester, with a thickness of more than 45 dTex, in particular more than 70 dTex are used should. You can choose between monofilaments or multifilaments for Both types of threads are used.

With the above-mentioned measures according to the invention it is ensured that at a load of the material in the material plane with a load proportion transverse to the production direction or load of the material by shear forces on both sides of the prepared target separation point T perpendicular to the material plane, the material along the linear predetermined separation point with destruction of the weft threads tear strength lower and intended along the predetermined separation point T is separated. Due to the omission of a spacer thread in skew this none of the usually much tear-resistant spacer threads must be destroyed, so that the required breaking forces alone can be adjusted by choosing the quality of the ripcords.

This can be done for a first purpose, which is to the resulting in the production running in the production direction Longitudinal edges of the spacer knitted fabric, one from the rest Spacer knit deviant shape and quality, before to separate the use of the spacer knit, this separation by mechanical forces can take place and no thermal Separators as before or no circular blade used have to come. As far as this application is concerned is, the separation points as close as possible along the Provide side edges.

This is for example favorable for such spacer knitted fabrics, which are to be used in mattresses or as mats. Such Spacer knits have a relatively large thickness and for presentation increased restoring forces under pressure load relatively stable monofilaments as spacer threads. Be this Spacer threads thermally or mechanically separated arise Fragments with free thread ends coming from the spacer knit can stand out and to loss of comfort in lead to the final use. This emergence of fragments of spacer threads is used with the avoided present invention.

To a second application can be provided, one to maximum Production width set knitting machine to use, although only knitted fabric of the width of a portion of the production width is needed. This can be done in a production process two or more initially interconnected in the production direction running strips of material are produced, which subsequently be separated by mechanical forces. Here you can For example, shear forces are used by the individual strips of material in different elevations be guided and on waves with divergent from each other Axle position to be wound up.

One third application is in the web material a Solltrennstelle which only in the application of the material produced from the web material Blade part is used, especially in an overload of the spacer knit, in which the type of failure or separation should be controlled.

One Covering material according to the invention can be similar serve the purpose of the aforementioned purposes that of the edges of the cover material made unusable during production become

As well The purpose of the purpose may be that when exploited large machine widths several consecutive be generated to be separated strips of material of the reference material, the only half or another fraction of the Include available manufacturing width.

One third and preferred use is finally in representing reference material when overloaded in use at a predetermined controlled Solltrennstelle is destroyed or controlled tears.

One Such application may in particular in the use of the reference material as a fabric for a dashboard or door panels or Dachsäulen a motor vehicle lie under the one so-called airbag installed to secure the vehicle occupants or, in use as a steering wheel cover, the hub of the steering wheel a motor vehicle are in the steering wheel plate or baffle plate an airbag is installed. In case of explosive release of the Under this cover fabric built-in airbags should its function not obstructed and the cover fabric, from the outside does not show a separation point, should along be easily breakable at a given separation point.

The Cover layer may consist of a textile material, in particular such plastic, carbon or metal filaments, or made of composite material of textile materials and a synthetic resin matrix. Alternatively, the cover layer of substantially homogeneous material exist, such. As leather, plastic, metal foil or a Metal printing coating. Leather and foils can be laminated on, while plastic or metal in situ from a plastic or liquid phase can be produced as a cover layer.

Two Preferred embodiments of the invention are in the Drawings illustrated below.

1 shows a section of a spacer knitted fabric according to the invention in an isometric view;

2 shows a section of a spacer fabric according to the invention with laminated reference material in an isometric view.

In 1 is a rectangular section of a spacer knitted fabric according to the invention 11 shown, in which the boundary edges shown are only to be understood systematically, since a knitted fabric consists of non-rectilinear stitches and weft threads in the fabric layers and spacer threads between the fabric layers.

It is upper knitted layer 12 , a lower knitted layer 13 and intermediate spacer threads 24 . 25 recognizable, with the arrow P, the production direction of the spacer knitted fabric is designated. The two knitted layers consist of stitches running in the direction of production 22 . 23 , which consist of warp threads and thus verwahren weft threads 15 . 16 which run back and forth across the production direction for connecting the stitches. It should be understood that the entire top knitted fabric 12 and the entire lower knitted fabric 13 entirely of substantially similar meshes and weft yarns entangled with each other 15 . 16 consist. The spacer threads 24 . 25 or pile threads are shown symbolically only on the front transverse edge, but not on the side edge running in the direction of production. The spacer threads 24 . 25 Run substantially in the direction of production P and move between the two fabric layers 12 . 13 with which they are forfeited, back and forth regularly. Here, every second of the spacer threads 25 a diagonal alignment between the fabric layers. The name for this type of laying is skew. Each in alternation with the spacer threads 25 in skew are spacer threads 24 provided, which also extend substantially in the direction of production P and thereby between the fabric layers 12 . 13 move back and forth in alignment. This type of laying is called I-laying. The wefts 15 . 16 According to the invention, first weft threads of greater tear strength, which are symbolized by stronger lines, and second weft threads in a separation area of the width T 15 ' . 16 ' of lower tensile strength, which are symbolized by weaker lines. In the area of the weft 15 ' the upper knitted layer 12 and 16 ' the lower knitted fabric 13 is found in the separation region of the width T an omission of one of the spacer threads ( 25 ) in skew, ie here are two spacer threads 24 in I-Legung with normal distance next to each other.

The wefts 15 ' . 16 ' lower tear strength can be marked by a deviating from the wefts greater tear strength color. The different tear strength of the weft threads can be represented by different thread thickness or different number of filaments or at the same thread thicknesses by a different quality. It will be understood that when loaded perpendicular to the direction of production or when subjected to shear forces perpendicular to the plane of the fabric layers 12 . 13 the spacer fabric 11 along the separation point of the width T with rupture of at least one weft thread 15 ' . 16 ' lower tear strength will fail. This is the purpose of the subject of the invention.

In 2 is a reference material 21 from a spacer knitted fabric 1 shown using the same reference numeral to which a cover layer 17 is laminated by substantially homogeneous material quality. The adhesive material used here is not shown in detail. The production direction is again indicated by an arrow P. The laminated cover layer 17 hides the upper knitted fabric 12 ; from the lower fabric layer 13 are the meshes 23 and also wefts 16 ' lower tear strength in the range of the width T, which is defined by the transverse profile of the weft threads of lower tear strength. Side of it are wefts 16 greater tear strength indicated. The construction of the upper knitted fabric 12 should completely the in 1 represented correspond. The cover layer 17 has an internal longitudinal scoring 18 , which extends over the front half of the material portion and only part of the thickness D of the cover layer 17 includes. The outer side of the Be zugsmaterials can not recognize this scribe extent. In the back half of the material section has the cover layer 17 a perforation line 19 on, extending through the entire thickness D of the topcoat 17 draws and so far from the outside of the reference material can be seen. It is understood that the spacer knitted fabric 11 with laminated top layer 17 with tensile stress in the material plane perpendicular to the production direction P or under shear forces perpendicular to the plane of the fabric layers 12 . 13 is destroyed in the region of the separation point of the width T, wherein the cover layer 17 along the scribe 18 or the perforation 19 tear apart. This is the purpose of the subject invention.

11

spacer

12

upper knitted fabric

13

lower knitted fabric

14

15

wefts (upper fabric layer)

16

wefts (lower fabric layer)

17

topcoat

18

scoring

19

perforation

21

reference material

22

mesh (upper fabric layer)

23

mesh (lower fabric layer)

24

spacer thread (I-laying)

25

spacer thread (Schräglegung)

T

separating region

D

thickness topcoat

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 102006023356 A2 [0002]
• DE 10260694 A1 [0006]

Claims (20)

Spacer fabric ( 11 ) consisting of two parallel knitted layers ( 12 . 13 ) through between the two fabric layers ( 12 . 13 ) reciprocating spacer threads ( 24 . 25 ), the knitted fabric layers ( 12 . 13 ) generally in the direction of production mesh ( 22 . 23 ) and thus weft threads ( 15 . 16 ) and wherein the spacer threads ( 24 . 25 ) generally in the direction of production and with the knitted fabric layers ( 12 . 13 ), wherein in at least one of the fabric layers ( 12 . 13 ) at least one weft thread ( 15 ' . 16 ' ) of lower tear strength for producing a substantially linear in the direction of production directed Solltrennstelle (T) is incorporated, and wherein in the region of at least one weft thread of lower tensile strength deletion of at least one spacer thread is provided, characterized in that the spacer threads viewed in the direction of production on the Width of the spacer knit is distributed at least partially in I-lapping ( 24 ) and at least partly skewed ( 25 ) and that in the region of the at least one weft thread ( 15 ' . 16 ' ) of lower tear resistance an omission of a spacer thread ( 25 ) in skew between two spacer threads ( 24 ) in I-Legung is provided. Spacer knitted fabric according to claim 1, characterized in that in both knitted fabric layers ( 12 . 13 ) in matching congruent position in each case at least one weft thread ( 15 ' . 16 ' ) of lower tear strength for producing the substantially linear direction of production directed Solltrennstelle (T) is incorporated. Spacer knitted fabric according to one of claims 1 or 2, characterized in that the at least one weft thread ( 15 ' . 16 ' ) lower tear strength and / or the weft threads ( 15 . 16 ) are formed by greater tear strength of monofilaments. Spacer fabric according to one of claims 1 to 3, characterized in that the at least one weft thread ( 15 ' . 16 ' ) of lower tear resistance and / or the weft threads ( 15 . 16 ) of greater tear strength of multifilament yarns. Spacer fabric according to one of claims 1 to 4, characterized in that the at least one weft thread ( 15 ' . 16 ' ) of lower tear strength has a thickness of less than 40 dTex, in particular less than 30 dTex. Spacer fabric according to one of claims 1 to 5, characterized in that the weft threads ( 15 . 16 ) of greater tear strength have a thickness of greater than 45 dTex, in particular greater than 70 dTex. Spacer fabric according to one of the claims 1 to 6, characterized in that two predetermined breaking points (T) in each case near the edge in the direction of production (P) considers lateral edges for separating the production edges is provided. Spacer fabric according to one of the claims 1 to 7, characterized in that a plurality of predetermined separating points (T) are provided in particular the same distance from each other, to from the knitted spacer single in the direction of production (P) running Produce strip of intended width. Cover material from a cover layer ( 17 ) and a relining of a spacer knitted fabric ( 11 ) consisting of two parallel knitted layers ( 12 . 13 ) through between the two fabric layers ( 12 . 13 ) reciprocating spacer threads ( 24 . 25 ), the knitted fabric layers ( 12 . 13 ) generally in the direction of production mesh ( 22 . 23 ) and thus weft threads ( 15 . 16 ) and the spacer threads ( 24 . 25 ) generally in the direction of production and with the knitted fabric layers ( 12 . 13 ), wherein in at least one of the fabric layers ( 12 . 13 ) at least one weft thread ( 15 ' . 16 ' ) of lower tear strength for producing a substantially linear in the direction of production directed Solltrennstelle (T) is incorporated, and wherein in the region of at least one weft thread of lower tensile strength deletion of at least one spacer thread is provided, characterized in that the spacer threads viewed in the direction of production on the Width of the spacer knit is distributed at least partially in I-lapping ( 24 ) and at least partly skewed ( 25 ) and that in the region of the at least one weft thread ( 15 ' . 16 ' ) of lower tear resistance an omission of a spacer thread ( 25 ) in skew between two spacer threads ( 24 ) in I-Legung is provided. Covering material according to claim 9, characterized in that in both fabric layers ( 12 . 13 ) in matching congruent position in each case at least one weft thread ( 15 ' . 16 ' ) of lower tear strength for producing the substantially linear direction of production directed Solltrennstelle (T) is incorporated. Covering material according to one of claims 9 or 10, characterized in that the deck layer of textile material, in particular of plastic, carbon or metal threads. Covering material according to one of Claims 9 or 10, characterized in that the cover layer ( 17 ) consists of a substantially homogeneous material such as leather plastic film, metal foil or metal pressure coating. Covering material according to one of Claims 9 or 10, characterized in that the cover layer ( 17 ) consists of a composite material of textile material and a resin matrix. Covering material according to one of Claims 9 to 13, characterized in that the cover layer ( 17 ) in the area of the predetermined separation point (T) has a material weakening coincident with the predetermined separation point (T), the weakening of the outer layer ( 17 ) in particular from a continuous, dotted or dotted inner milled or scored ( 18 ) consists. Covering material according to one of Claims 9 to 14, characterized in that the cover layer ( 17 ) on the spacer knitted fabric ( 11 ) is laminated Covering material according to one of Claims 9 or 10, characterized in that the cover layer ( 17 ) consists of the plastic state aufzustrichen in situ thermoplastic. Covering material according to one of Claims 9 to 16, characterized in that the at least one weft thread ( 15 ' . 16 ' ) of lower tear strength has a thickness of less than 40 dTex, in particular less than 30 dTex. Covering material according to one of Claims 9 to 17, characterized in that the weft threads ( 15 . 16 ) of greater tear strength have a thickness of greater than 45 dTex, in particular greater than 70 dTex. Covering material according to one of the claims 9 to 18, characterized in that two predetermined separation points (T) in each case near the edge in the direction of production (P) lateral edges for separating the production edges is provided. Covering material according to one of the claims 9 to 19, characterized in that a plurality of predetermined separation points (T) are provided in particular the same distance from each other, from the reference material single in the direction of production (P) running Produce strip of intended width.