DD285383A5 - METHOD FOR INCREASING THE CROSS-STRENGTH AND TARGETED CHANGING OF THE PROPERTIES OF FLEECE ELEMENTS OR Needled pile KNITTED - Google Patents

Abstract

The invention relates to a method for increasing the transverse strength and targeted modification of the properties of nonwoven knitted or nonwoven knitted fabrics. The object and the object of the invention is to produce nonwoven fabrics or nonwoven fabrics having good strength values in the longitudinal as well as in the transverse direction without substantial increase in the surface mass and without a stiffening of the fabric. According to the invention, in nonwoven or nonwoven fabrics made of singulated fibers or nonwoven fabrics, transverse yarns are laid which extend over the full working width and are clamped and held between the mesh legs and the transverse joints formed by fibers between the stitches. Fig. 3 {nonwoven knitted fabrics; Needled pile knitted fabrics; Transverse strength; transverse threads; Cross-connections}

Description

For this 1 page drawings

Field of application of the invention

The invention is used in the production of nonwoven knitted fabrics or nonwoven knitted fabrics in which sufficient stability can not otherwise be achieved in the transverse direction.

Characteristic of the known state of the art

In the production of nonwoven knitted or nonwoven knitted fabrics, which are produced from non-spun fibers, especially in the case of outerwear fabrics, it is usually not possible to achieve a sufficient breaking strength and a low elongation at break in the transverse direction.

In order to achieve improvements in this regard, various proposals have already been made.

Thus, it is already known to introduce a separately produced, further fabric as an additional back to the nonwoven knitted fabric with the normally carried out chemical hardening of the fabric and to stick with this. This "secondary backing" was intended to guarantee the corresponding values, with an increase in the use of hardening agents, an increase in basis weight and additional stiffening of the product.

Other proposals provide for the additional application of cross-oriented fibers - also when solidifying. This can be done either by sprinkling dry fibers on the still moist solidification layer (WP B 32 B / 319047.2) or by mixing of fibers in the solidifying agent and applying with the Vorfestigungsmittel (DD-PS 264468). Other variants provide for the presentation of threads (WP D 04 B / 3 23081.8) or the splitting of films (DD-PS 259215) and their integration and deformation into mesh before.

The application of cross-oriented fibers to the conveyor and their incorporation in the form of meshes (WP D 04 B 328 547.0) has also been proposed.

Another possibility is the brushing out of fibers from the mesh, the cross-laying and sticking of these fibers to the back of the fabric (DD-PS 267 524), which must extend over several wales.

In a further possibility, it is proposed to apply cross-oriented fibers to the raw material which has not yet solidified, and to needle them with the fabric (WP 0 04 B / 328 546.2). During subsequent solidification, the needled fibers are firmly bonded to the fabric.

A method is also known from the OD-PS 251805, are produced in the non-woven fabric knitted fabric with one or both sides plush blanket. Longitudinal and transverse threads are meshed together with fibers from a pile fleece. The longitudinal threads are thereby offset by at least one slide needle pitch and form together with the transverse threads a support frame, through which a part of the tufts is pulled from the front to the rear side of the goods. None of these proposals has yet achieved significant improvements. Some of the achievable changes were small, sometimes additional operations or other measures were required, so that on the one hand the properties did not reach the required level, on the other hand, the economic advantages of fleece-knitted or nonwoven-stitched fabric production were at least partially degraded. For these reasons, none of the proposed solutions could prevail. The reason for the insufficient properties in the transverse direction is the relatively small number of fibers arranged in the transverse direction. All efforts have so far been directed to increase this number of fibers.

Object of the invention

The aim of the invention is the production of nonwoven knitted or nonwoven knitted fabrics with the required properties especially in the transverse direction, but no significant increase in the basis weight and no stiffening of the fabric should occur. The measures should be applied without additional operation in the production of the fabric.

Explanation of the essence of the invention

The invention is based on the object of producing a nonwoven knitted or nonwoven knitted fabric having good strength values in the longitudinal as well as in the transverse direction. The process according to the invention should be usable for smooth nonwoven fabrics as well as for nonwoven fabric.

The object is achieved in that in nonwoven fabrics or nonwoven fabrics, which are made of spun fibers or fiber webs and on one side of the fabric meshes and on the other high Polfaserbüschel, Polfaserschiingen or flat Maschensie ^ e have, transverse threads be inserted over the

Fibers formed cross-connections between the wales are clamped and held. , The threads do not form stitches. They are held by clamping action. They can be inserted in different densities

become. They can be laid in dense strips and / or less dense strips in alternating sequence. They may be parallel to each other or intersect. They can be clamped and held in a course or in more than one course.

It also corresponds to the invention, when the thread layers outside the processing machine formed by a Memory are supplied, as if formed in the processing machine and immediately supplied to the workplace

become.

The inserted threads may be yarns, threads, silks, rovings, towed cables, foils or foil tapes when they are used

have corresponding strength values.

Also, to achieve certain elasticity values highly elastic materials, such. B. Texturseiden, PU silk etc. as Cross threads are inserted. When using or using adhesive tapes or such materials or

shrinkable threads or such materials can, when exposed to the appropriate temperatures, the binding of the

Threads in nonwoven or nonwoven fabric or the properties and certain effects of nonwoven or nonwoven fabric influenced

become.

embodiment The invention will be explained in detail in the following embodiment. In the drawing shows:

Fig. 1: a job according to the invention with simultaneous formation and processing of thread layers; FIG. 2 shows a workstation according to the invention with thread layers formed outside the machine; FIG. 3 shows a schematic stitch pattern.

The job is in both cases from the needle! 1, 2 closing wires and sinkers 3 in a known manner

built up.

In Fig. 1 4 thread layers 5 are formed by means of a thread-laying device and fed to the Nähwirkstelle in the usual way. The fleece knitted fabric 6 forming fibers 7 are supplied by a conveyor with rotating rollers 8 and in the Hooks of the needles 1 inserted. The detected fibers 7 are in the reverse gear of the needle needles 1 to Polbüscheln

9, pulled through the hanging on the shafts of the slider needles 1 half-stitch 10 and the half-stitches

10 dropped over the tips of the needles 1 to wales, which constitute the sheet 6. In the mesh of the fabric 6, the stretched threads or thread layers 5 are included and by mesh legs 11; 12 (Fig. 3) and the cross connections 13, which extend from one row of stitches to another, as well as from one course of wales to wales in different directions.

Fig. 2 shows the feeding of thread layers 14, which were made outside the machine. The cohesion can be through

a few lengthwise sewing threads, welds or the like can be increased. The fibrous web 15 is characterized by a vibrating

Conveyor 16 delivered and inserted into the hooks of the needles 1. The processing of the nonwoven fabric 15 and the Thread layers 14 are as shown in Fig. 1, but without the formation of pile tufts. The threads 14 are in the product in the same Clamped and arranged as described in Figure 3. They too do not form meshes. As transverse threads 5 and 14 all threads can be used, such as. B. rovings, yarns, threads, silks, etc., if they

respectively required values with regard to tear strength, elongation at break, etc. This also applies to Vorgarnfäden, tow or the like. Spliced or cross-directionally spliceable film layers can also be used.

For special purposes but also stretchy and elastic threads such. B. texture materials, PE silk etc.

used, if appropriate elasticity requirements exist.

In the later equipment, the threads 5 and 14 with the mesh legs 11; 12 and the cross connections 13 through

a chemical treatment connected so that a sliding of the wales is avoided on the threads.

Claims (13)

1. A method for increasing the transverse strength and targeted modification of the properties of nonwoven fabrics or nonwoven fabrics, characterized in that in nonwoven fabrics or nonwoven fabrics, which are made of spun fibers or fiber webs and on a fabric side mesh and have on the other pending Polfasebüschel, Polfaserschiingen or flat mesh webs, transverse threads or thread layers are inserted, which extend over the full working width of wales to wales and clamped between the mesh legs and formed by fibers cross connections between the wales and held. 2. The method according to claim 1, characterized in that the threads do not form mesh. 3. The method according to claim 1, characterized in that the threads are inserted in different density. 4. The method according to claim 1, characterized in that the threads are inserted in dense strips and / or less dense strips in alternating sequence. 5. The method according to claim 1, characterized in that the threads are parallel to each other. 6. The method according to claim 1, characterized in that the threads intersect. 7. The method according to claim 1, characterized in that the threads are clamped and held in one or more than one course. 8. The method according to claim 1, characterized in that the thread layers are produced in the processing machine. 9. The method according to claim 1, characterized in that the thread layers are produced outside the processing machine and supplied from a memory. 10. The method according to claim 1, characterized in that the threads are rovings, yarns, threads, silks, films, foil strips, tow, etc. 11. The method according to claim 1, characterized in that to achieve certain elasticity values highly elastic materials such. B. Texturseiden, PU silks, etc. are used. 12. The method according to claim ^, characterized in that adhesive threads or such thread-like materials or the like are used or used. 13. The method according to claim 1, characterized in that shrinkable threads or such thread-like materials or the like can be used or used.