CN101421450A

CN101421450A - Stretchable fabric

Info

Publication number: CN101421450A
Application number: CNA2007800128855A
Authority: CN
Inventors: 约尔格·鲁舒尔特
Original assignee: Global Safety Textiles GmbH
Current assignee: Global Safety Textiles GmbH
Priority date: 2006-04-12
Filing date: 2007-04-12
Publication date: 2009-04-29
Also published as: CA2649382A1; US20090194188A1; WO2007118673A2; DE102006017270A1; JP2009533565A; MX2008013155A; ZA200808659B; WO2007118673A3; EP2004886A2

Abstract

Disclosed is a fabric comprising first and second warp threads and first and second weft threads. Said fabric is characterized in that the first warp threads (11, 12) and the first weft threads (13) form a basic fabric (17) while the second warp threads (14), along with the second weft threads (15), form a covering fabric that adjoins the basic fabric (17), the second warp threads (14) also being interwoven with the first weft threads (13).

Description

Stretchable fabric

Technical field

The present invention relates to a kind of Stretchable fabric, it comprises first and second warp yarn and first and second weft yarns.

Background technology

The fabric that is used for the air bag of automobile passenger maintenance system in order to manufacturing is known, and this fabric is with uncoated mode combination.In application, to inflate apace by the gas that is injected in it by the air bag that this fabric is made, the pressure that is produced makes air bag be subjected to tensile stress, makes this fabric construction open (that is the gas permeability that, improves fabric by its structure that stretches), allows charge air conditioning to discharge.This can greatly hinder the response of air bag, and this for example is because air bag launches lentamente and therefore continue loss gas.Therefore, air bag postpones to form its protection occupant's buffering effect, but also may have the danger that brings injury because of overflowing of charge air conditioning.

People once attempted offsetting higher charge air conditioning loss by bigger aerator.Yet its shortcoming is that such module will finally cause the expense height must be difficult to accept.Another method that overcomes top described negative effect is, gas cell fabric is applied or lamination treatment.Although this has realized almost optimum fabric really aspect gas permeability, however the therefore and obviously rising of the manufacturing cost of this fabric, and the additional process during " applying or lamination " produces makes whole manufacturing become complicated, and thereby becomes extremely important naturally.

Summary of the invention

Task of the present invention is to provide a kind of fabric, to avoid or at least obviously to reduce the shortcoming of prior art.

This task at first will realize by the fabric with first and second warp yarn and first and second weft yarns according to claim 1, this fabric is characterised in that, described first warp yarn and described first weft yarn form bottom, and described second warp yarn and the described second weft yarn morpheme are in the layer at described bottom top, described second warp yarn also interweaves with first weft yarn, and described first warp yarn and second warp yarn are thus arranged, be that they are arranged side by side substantially in the mode that replaces after fabric tension, so that second warp yarn always is positioned at first warp yarn next door.Have such advantage now according to fabric of the present invention, that is, adopting described fabric to make air bag so that described two overhead layers when facing with each other, can produce air cushion, when airbag deployment, each overhead layer of this air cushion at first is subjected to the impact of aerator gas.When being subjected to the impact of aerator gas at airbag deployment, can cause according to Fabric Design of the present invention, first warp yarn and first weft yarn stretch under load, and second warp yarn is pulled into second weft yarn between described first weft yarn owing to bottom is stretched in the intermediate space that produces.Increase along with pressure, in the fabric these " gap " or " hole " will be by described second weft yarn " obstruction " (therefore, described second weft yarn also can be called as the sealing yarn), thereby prevent or at least greatly postpone the further raising of gas permeability, the result is, because fabric forms sealing or keeps sealing under load condition, the discharge of charge air conditioning just will be restricted.

Secondly this task realizes by the fabric with first and second warp yarn and first and second weft yarns according to claim 2, this fabric is characterised in that, the elastic modelling quantity of first warp yarn is greater than the elastic modelling quantity of second warp yarn, and weave described second warp yarn with the warp tension that is lower than described first warp yarn, and described first weft yarn is positioned at the baseplane, and described weft yarn is positioned at the overhead plane along described baseplane, described first warp yarn and described second warp yarn are thus arranged, promptly, they are arranged side by side substantially in the mode that replaces after described fabric tension, so that second warp yarn always is positioned at first warp yarn next door.Advantage according to this fabric of the present invention is identical with the advantage of fabric according to claim 1.Yet, in the second fabric solution, fabric is when being applied to air bag, although the result is identical with first fabric substantially, that is, prevented that gas permeability further improves in the operation, thereby opened and in the effective life of air bag at air bag, the escape of charge air conditioning can significantly not increase, but the response of fabric is different.By the design according to fabric as claimed in claim 2 of the present invention, second warp yarn will obtain obviously bigger bending, and this is because second warp yarn has higher elastic modelling quantity with respect to first warp yarn and be to interweave with lower warp tension.Be used at fabric under the situation of air bag, fabric is subjected to tensile load, first warp yarn that has so than low elastic modulus will be stretched more than second warp yarn with higher elasticity modulus, so the increase of spacing will obtain offsetting between these first weft yarns when fabric is subjected to tensile load, promptly, second weft yarn in the overhead plane is arranged in the big space of change between these first weft yarns more or less before, so that the absolute distance between two adjacent weft yarns remains is roughly the same.Thereby so this make can be advantageously with intermediate space, and also the gas permeability between warp yarn and the weft yarn is maintained constant, perhaps according to loading curve they are controlled individually by the air pressure that produces in the air bag.

In whole specification, mention first and second warp yarn and weft yarn repeatedly.Here to emphasize that above-mentioned saying do not mean that and only limit to independent yarn, and can comprise and be multilayer form or, that is to say the multiple adjacent yarn that is arranged side by side by stacked yarn.At for example " first warp yarn (ein erster

) " this expression way in, " ein " is functional and do not mean that quantity.

In two modified examples of embodiment, fabric according to the present invention can be provided as the form of monomer, for example is provided as filtration members or gas jetting mechanism in air bag and single-piece fabric (OPW) air bag.Air bag also can be made by this fabric fully.

Be stressed that,, can in fabric, adopt yarn with different designs and/or stretching along warp-wise and/or broadwise according to the present invention.It should be understood that it does not really want to be applied to exclusively car passenger protection system, but also can be applied to use a lot of technical fields of textiles.

The material that also can on broadwise, adopt powerful structure to knit for described first weft yarn (sealing yarn) according to the present invention, and apply very high warp-wise tension force to described first warp yarn, like this, second warp yarn (sealing yarn) will be lifted owing to the tensility that structure is knitted material in manufacture process, break away from the bottom interlocking, thereby compare with being arranged in the bottom plane, trend towards being set at more eminence (overhead).

Description of drawings

In order to understand better, describe the present invention in detail in the mode of example below with reference to accompanying drawings, in the accompanying drawing:

Fig. 1 schematically shows the fabric according to prior art, and it is in the state that is not stretched;

Fig. 2 schematically shows the fabric of Fig. 1, but this fabric is in the state that is stretched as being taken place in its application as air bag;

Fig. 3 schematically shows an illustrative embodiments according to fabric of the present invention, and this fabric is in the state that is not stretched;

Fig. 4 schematically shows the fabric of Fig. 3, but this fabric is in the state that is stretched;

Fig. 5 schematically shows another illustrative embodiments according to fabric of the present invention, and this fabric is in the state that is not stretched;

Fig. 6 schematically shows the fabric of Fig. 5, and this fabric is in the state that is stretched.

The specific embodiment

Referring now to Fig. 1, it shows the weft yarn 3 that is interwoven by the

warp yarn

1 and 2 in the fabric that is made into circle significantly enlargedly in common L1/1 plain weave, and wherein the spacing between two weft yarns is with Reference numeral 6 expressions.Fig. 1 top view is represented the fabric cross section along first warp yarn, and wherein first warp yarn 1 is around weft yarn 3.

Next view is represented the fabric cross section by the disclosed plain weave of prior art, and this fabric cross section is along second warp yarn 2.Spacing 6 between the weft yarn 3 (between warp yarn, responding identical) is by structure qualification.

Referring now to Fig. 2, it illustrates fabric cross section shown in Figure 1, but this fabric is in the state that is stretched, and that is to say, for example fabric applications is in inflation or in the air bag after the inflation.Use the gas spray air bag (not shown) that produces by the aerator (not shown) and/or the impact of buffering automotive occupant to cause the stretching of fabric is loaded, (be marked with a), thereby be rendered as the state that is stretched among Fig. 2 so that the spacing 6 between the weft yarn becomes is big.Spacing 6a is greater than spacing 6, and has corresponding bigger spacing at the weft yarn of position 3a.The described increase of spacing 6a between the weft yarn 3a has improved the gas permeability of this fabric, the remarkable stretching shown in causing, and in this drawing process, yarn (warp yarn and weft yarn) will attenuate.

Referring now to Fig. 3, it illustrates an embodiment of new fabric, and this embodiment comprises first weft yarn 13 that is furnished with second weft yarn 15 (so-called sealing yarn) on it.Be similar to the view of Fig. 1 and 2, the last view of Fig. 3 shows first weft yarn 13 and second weft yarn 15 as the mode that how is associated with

warp yarn

11 and 14 is led latitude.Here first weft yarn, 13 approximate formation bottoms 17 are furnished with overhead layer 19 in fact not arranged side by side very on it.Next view of Fig. 3 illustrates warp yarn 12 and 14.As clearly shown in Figure 3,

first warp yarn

11 and 12 is only around 13 bendings of first weft yarn, and second warp yarn 14 (it has similarly around the function of knitting yarn in the case) is around knitting second weft yarn 15, thereby forms overhead layer 19 on bottom 17.Second weft yarn 15 here is not to be arranged within the bottom 17 as the sealing yarn, but is arranged on the bottom 17, and constitutes " overhead layer " 19.In fact, overhead layer 19 self is not a fabric, but is placed in the top layer 19 by second weft yarn 15 and second warp yarn 14 (around knitting yarn) formation on the bottom 17.The fabric of Fig. 3 is to illustrate with unstretched state, and the fabric of Fig. 4 presentation graphs 3 is in extended state, shows first and

second warp yarn

11,12 by and situation about stretching left to the right.Spacing between the weft yarn 13a increases to the degree shown in the intermediate space size 16a, and in the intermediate space between weft yarn 13a, the second weft yarn 15a (sealing yarn) will be drawn in the intermediate space 16a around knitting yarn (the second warp yarn 14a).So can keep the intermediate space between the yarn consistently, but and then the gas permeability of approximately constant ground maintenance fabric under extended state.

Special design according to fabric of the present invention can make now, by presetting second warp yarn (around knitting yarn 14) around the haul distance of knitting

weft yarn

13 and 15, can constantly keep intermediate space 16 and then the constant gas permeability of keeping between the fabric yarn that the stretching under the loading condiction causes, along with stress rises and reduces gas permeability or increase gas permeability as requested or control gas permeability individually according to loading curve.Referring now to Fig. 3 and Fig. 4, thereby can for example set minimum spacing (spacing 16 among Fig. 3 and the spacing 16b among Fig. 4) between two sealing weft yarns.In the aspect shown here, suppose that gas permeability keeps constant, then the spacing (spacing 16) between two first weft yarns 13 among Fig. 3 equals among Fig. 4 the spacing 16b between two weft yarn 13a and the 15a.If the haul distance of second warp yarn 14 (around knitting yarn) is chosen as longer with than in the modified example shown in Figure 3, during to the fabric application of force, form spacing 16b at the view that is similar to Fig. 4 so, this spacing 16b is greater than as shown in Figure 3 spacing 16.In textile structural, also can make the spacing between the

layer

17 and 19 bigger according to Fig. 3.In contrast, also can make the spacing of layer between 17 and 19 littler, this will cause, and when the situation that is similar to Fig. 4 applied load to fabric, spacing 16b will be less than spacing shown in Figure 3 16, thereby reduces gas permeability along with the increase of load.

Certainly, also can use described fabric construction, promptly exchange warp yarn and weft yarn in opposite mode according to Fig. 3 and 4.This may relate to for along broadwise around knitting the material that yarn adopts powerful structure to knit, and apply very high warp-wise tension force to similar sealing yarn, like this, structure knits that the maximum tension amount of material allowed as described, the sealing yarn is lifted during fabrication and leaves the bottom interconnection, thereby compare with the situation here, be tending towards being disposed in the more top (overhead) of bottom.

Referring now to Fig. 5, it illustrates second illustrative aspects according to fabric of the present invention, and this fabric is in the state that is not loaded, and its property class is similar to first illustrative aspects, yet does not comprise independently around knitting yarn and sealing yarn.According to Fig. 5, in warp-wise, adopt two kinds of different thread material, promptly the elastic modelling quantity of first warp yarn 21 and second warp yarn, 24, the second warp yarn 24 is greater than the elastic modelling quantity of first warp yarn 21.As according to shown in Figure 5, second warp yarn 24 is to weave than first warp yarn, 21 low warp tensions, and this will produce fabric situation like this, and promptly first weft yarn 23 is woven in the baseplane 27, and weft yarn 25 is positioned at plane 29, top.Elastic modelling quantity is subjected to warp-wise tension force in order to Woven fabric less than first warp yarn 21 of the elastic modelling quantity of second warp yarn 24, and the warp-wise tension force that the warp-wise tension force that elastic modelling quantity is subjected to greater than second warp yarn 24 of the elastic modelling quantity of first warp yarn 21 is subjected to less than first warp yarn 21.Thereby obtain fabric state shown in Figure 5, promptly wherein weft yarn 25 is positioned on first weft yarn 23 equally, forms the plane, top 29 that is positioned on the baseplane 27.

Referring now to Fig. 6, it shows the fabric of Fig. 5, but this fabric is in the state of loading.Imposing to fabric under the situation of identical absolute load, the first warp yarn 21a that has than small elastic modulus will be than the second warp yarn 24a with big elastic modelling quantity to be stretched by a larger margin, so the gap between the first weft yarn 23a fabric be subjected to stretching when loading change big (26 become 26a) since before the weft yarn 25 of overhead become and be arranged into more or less in the spacing 26a that becomes big and compensated for, thereby adjacent weft yarn 23a, absolute spacing 28 between the 25a remains unchanged, and thereby can constant maintenance intermediate space 26/28, and then the gas permeability between can constant maintenance weft yarn.

Of the present invention one favourable aspect in, fabric for example shown in Figure 6 is characterised in that, this fabric is not weaving under the stress state, first warp yarn 21 has identical bending with second warp yarn 24, and wherein the material strain of second warp yarn 24,24a is greater than the adaptability to changes (strain capacity) of first warp yarn 21,21a.Advantageously, in this fabric, second weft yarn (sealing yarn 25) can lifting leaves the plane of first weft yarn, and this bears adaptability to changes because of warp yarn under stress state is different.

Yet, also can make this spacing be greater than or less than the spacing that does not load fabric shown in Figure 5.Make that according to design of the present invention if braiding is similar to fabric shown in Figure 6 (that is, warp yarn 21 and 24 has identical bending, but be under the unstretched state this moment), then gas permeability will rise significantly.Yet, because difference (the strain property height of second warp yarn 24,24a of strain property, the strain property of first warp yarn 21,21a is low) can be lifted the plane of leaving first weft yarn 23 under stress state (similar and shown in Figure 5 for second weft yarn (sealing yarn 25), but be under load condition, and the spacing of plane 27 and 29 is bigger).

Of the present invention another favourable aspect in, a kind of fabric is proposed, wherein have special selected parameter (for example elastic modelling quantity) or the warp yarn of also arranging with special selected order and the fabric of weft yarn, can set or regulate stress strain curve separately by comprising at predetermined portions.By the fabric of the design according to the present invention, other technologies parameter (for example stress strain curve) can be set separately or be regulated, and thereupon because the stretching of fabric each several part is either large or small, thereby also for example influences the deployment characteristics of air bag.These smart fabric make can be in the future to regulating or set the parameter of fabric separately independently of each other, and fabric parameter is being brought into play with being relative to each other connection and acted on owing to the reason of design at present.

Reference numeral

1,1a, first warp yarn

2,2a, first warp yarn

3,3a weft threads

6,6a spacing

11,11a, first warp yarn

12,12a, first warp yarn

13,13a, first weft threads

14,14a second warp yarn (around knitting yarn)

15,15a second weft yarn (sealing yarn)

16, the 16a spacing

The 16b spacing

17 bottoms

19 overhead layers

21,21a first warp yarn

23,23a first weft yarn

24,24a second warp yarn

25,25a second weft yarn (sealing yarn)

26, the 26a spacing

27 baseplanes

28 spacings

29 overhead planes

Claims

1. stuetch fabrics with first and second warp yarn and first and second weft yarns, it is characterized in that, described first warp yarn (11,12) and described first weft yarn (13) constitute bottom (17), and described second warp yarn (14) and described second weft yarn (15) constitute along the overhead layer (19) of described bottom (17), described second warp yarn (14) also interweaves with described first weft yarn (13), and described first warp yarn (11,12) and described second warp yarn (14) be thus arranged, be that they are arranged side by side substantially in the mode that replaces after described fabric tension, so that second warp yarn (14) always is positioned at first warp yarn (11) next door.

2. stuetch fabrics with first and second warp yarn and first and second weft yarns, it is characterized in that, the elastic modelling quantity of described first warp yarn (21) is less than the elastic modelling quantity of described second warp yarn (24), and with the warp tension that is lower than described first warp yarn (21) described second warp yarn (24) that interweaves, and described first weft yarn (23) is positioned at baseplane (27), and described weft yarn (25) is positioned at the overhead plane (29) along described baseplane (27), described first warp yarn (21) and described second warp yarn (24) are thus arranged, be that they are arranged side by side substantially in the mode that replaces after described fabric tension, so that second warp yarn (24) always is positioned at first warp yarn (21) next door.

3. stuetch fabrics particularly according to claim 1 and 2, it is characterized in that, described fabric is not weaving under the stress state, described first warp yarn (21) has identical bending with described second warp yarn (24), described second warp yarn (24, strain 24a) greater than described first warp yarn (21, strain 21a).

4. particularly according to claim 1,2 or 3 described fabrics, it is characterized in that, described fabric comprises warp yarn and weft yarn in predetermined portions, described warp yarn and weft yarn have special selected parameter such as elastic modelling quantity, perhaps also arranges with special selected order.