DE6948483U - THREAD-REINFORCED FLEECE FABRIC - Google Patents

Description

Thread-reinforced nonwoven web

The term "nonwoven fabrics" refers to fabrics, so-called non-wovens, the non-honored way to the working methods such as those cf j weaving and Virkens prepared, but which are produced by novel techniques.

Nonwovens are made by consolidating fiber fleeces 'displayed. The nonwovens themselves can be mechanically, e.g. on horseradish, aerodynamically in blow molding and produced hydrodynamically in Vassersr.hwenn process will. Spunbonded nonwovens, that is, nonwovens made from a fiber spun curtain are the latest developments in the field of the manufacture of nonwovens represent.

Ka the further consolidation of the fiber webs. * N preferably mechanically by needling carried out _e In this process the α expectant Einzelfasexn of the webs by a variety of provided with a beard needles detected and partially drawn inwardly. This results in a consolidation of the pasar structure in the third dimension, the oine stabilization and solidification on all sides for the result; Has.

Nonwoven fabric can in their inner structure Parallella _ü envliesen made with egg ^ he favor the fiber layer preferably in the longitudinal direction. But they can also be made from cross-ply fleeces, from fleeces whose piles are alternately oriented in the transverse direction. Random fiber nonwovens result in nonwovens in which the individual fibers do not have a preferred direction, in which the staple fibers are thus unevenly, confused.

Depending on the orientation of the underlying fiber fleece and the further consolidation of these nonwovens, the nonwovens show different mechanical strength values. So The parallel-layer nonwovens described are characterized by preferred tear resistance in the longitudinal direction; Cross-ply nonwovens have increased strength in the transverse direction, among other things, and random fiber nonwovens are in this respect roughly the same in both directions.

The sense of reinforcing nonwovens by inserting threads from native or synthetic Raw materials is to compensate for the tensile strength values in every direction or to increase them on one side prefer or increase. It is also reflected in the ability to correct the stretching properties, likewise in both directions warp and weft and / or in a preferred direction.

The desired increase in tear strength in each Direction or decrease in elongation is then '

particularly useful if the non-woven fabric prefabricated part is mechanically stressed on all sides during later use. The preference for one direction can on the other hand important for any additional equipment be used, i.e. if the fleece tuff web is ft is subjected to a coating with plastics.

Yarn scrims as reinforcement elements for nonwoven webs, be it those in the warp or weft direction, be it those that only work in the warp or weft direction:

run, have compared to the usual

weaving, knitted fabrics or foils have the advantage that they can be attached to j

On-site during the manufacture of nonwovens by | j simple · running-in can be generated with.

This is also of technical interest, namely, in that the densities of the pad banks are specific constant and / or variable, article-related can be easily produced. Ultimately it will be this way a significant cost reduction is achieved.

Scrim as reinforcement elements »for example so-called polypropylene tapes give the nonwoven web significantly increased tear resistance. Ever Depending on the density of the inlay, this can be increased from a few 100 g per 5 cm strip width to several kg.

Figure 1 shows a nonwoven web of conventional construction in cross section. She is from a lower one Fleece layer, a scrim attached underneath and an upper fleece layer and was made mechanically solidified by a final needle operation.

It means drawing 1

a) the lower fleece

b) the scrim

o) the upper fleece layer

d) tufts of fibers drawn in downward by a needle process

Nonwoven webs of the type described are in practical use and have proven themselves quite well. It sticks But they have the disadvantage that with them the increase in mechanical strength values brought about by the scrim - in relation to the cross-section of the goods - under stress can only be effective in a narrow area of the horizontal.

This point of view is particularly effective with such Nonwoven webs or molded parts made from them if they are in the construction with a greater thickness of only low density are "

Another disadvantage of such constructions is that the scrim as an isolated component between the nonwoven upper layer and the nonwoven lower layer with the combination of these The desired characteristics of the layers, such as the insulation values, the mechanical, thermal and acoustic, elasticity, etc., interrupted in cross-section and essentially negatively influenced

This moment is particularly pronounced when the goods are still solidified with a binding agent. In this case, depending on the type of raw material, the scrim becomes loaded in comparison to that on both sides covering fiber fleeces differ in thickness, which leads to even greater layering «Not It is seldom the case that the layers can be easily separated from one another, especially when it comes to the later Use under flexing stress can have a negative effect.

The innovation now has the task of avoiding the disadvantages described and a thread-reinforced nonwoven web to create a reinforcement that becomes evenly effective across the width when viewed across the width is present and because the scrim is a quasi-integrated component.

This is achieved by the fact that the threads with respect to the cross section in at least 2, but preferably inserts more than 2 levels. The total number of threads should be that of the conventional construction correspond.

- 5th

I »» I

• ti ι ·

If Il

Drawing 2

represents a new, old-fashioned nonwoven web which the scrim lies in 2 levels

B. means a) the lower fleece "with scrim

b) the upper fleece with scrim

c) fiber bundles drawn in near the bottom by a needle preseed

Drawing 3

shows a neuerungsgenäße Vliesstcffbahn in which the scrim in much as two-level "λ rests ·

It means: a) the nonwovens

b) the inserted thread hairs

c) fiber bundles drawn in near the bottom by a needle process

The innovation is not limited to nonwovens that are made by needling and possibly later pragnation of nonwovens are made * you rather, koenat is particularly good for effect, vena the further consolidation of the nonwovens by casehardening, by spraying or by binding agents that are applied to the scrim itself, state comes·

Claims (1)

Protection claims SB = SBSSBSBSBSStSSe 1. Thread-reinforced nonwoven fabric, consisting of
1, 2 or more fiber fleeces with inserted threads, characterized in that the threads are in at least 2, but preferably in more than 2
Laying in levels. 2, thread-reinforced nonwoven web according to claim 1, characterized in that they are ei.non mecl niche process; ie needles, fulling, etc. are further solidified is. Fs.derr / e.ostca'kte Vliepst "bahn ηε _"; η claim 1, and given-faMs claim?, Dadv " ¹ Ch characterized that with the help of binders by Tat-Thens Fprü? οι .., powdering, etc. is solidified _o "--erstark · -ϊ Vlier .- ^ - oiVbr ^T -.n according to claim 1
■.-Id T3seoe "ienfails claim 2 and 3> dadurc 'gekeniize.'. ^ -H η ·.: -. ■? ■ ,, o.ass them dfr-ofe Bindf ri 'rägnJaruag aes Fr en.gelc.ge3 ve: .- :? e-; t ± gt is _o