DE2231335C3 - Highly elastic, knitted, yarn-like structure and method for producing such a structure - Google Patents

Description

The invention relates to a highly elastic, knitted, yarn-like structure according to the preamble of Claim 1 and a method for producing such a structure according to the preamble of the claim 2nd r,

Such a highly elastic structure and a method for its production is from DE-PS 6 07 027 known. The disadvantage of this yarn-like structure is that it is not elastic enough.

There are also elastic yarns and twisted threads, in the manufacture of which elastomer threads are used, known. So there are so-called wrapped yarns, which are manufactured in such a way that an elastomer thread runs along with the spinning of staple fibers to make a yarn. The disadvantage of the yarns thus obtainable is that 4 ^r> will be practically achieved only at a certain pre-stretching of the elastomeric yarn during the spinning process, an optimum in the elastic behavior of the yarn obtained. Variations are not possible here.

Furthermore, elastic threads are known, for the production of which one or more elastomer threads are used a yarn spun from staple fibers or a textured or non-textured continuous yarn conventional methods are twisted together. ^

There are also known wrapping yarns in which an elastomeric thread is separated from a non-elastomeric thread is tightly wound.

Finally, there are so-called overlaid covering yarns, in which a core consists of a like above-described wrapping yarn on a processing machine, e.g. B. Raschel, with a thread is meshed.

The wrapping yarns described above have been known for a long time and are referenced e.g. B. in K ο c h S a 11 ο w, Large textiles encyclopedia, under the keyword "Umspinnungszwirne".

The disadvantage of all elastic previously described

W) Yarns and twisted threads are too small in terms of their ability to vary in terms of elastic behavior after their manufacture, because such twisted threads usually have an average extensibility of only about 15%.

The object of the present invention is therefore to produce highly elastic yarns that allow the production of textile fabrics therefrom a large number of possible variations in relation to to ensure the state of stretching of the yarn according to the invention during processing.

This object is achieved by the features listed in the characterizing part of claim 1

The method for producing such a yarn-like structure is characterized in that a plied yarn, which in turn consists of at least one elastomeric component and at least one textured or non-textured synthetic continuous component or a staple fiber yarn, with variable inlet tension of the elastomer component on a 2-font knitting or warp-knitting machine meshed.

The yarn-like structure according to the invention is highly extensible up to a range of approx. 200 to approx. 400%. When stretched, it looks like stretched elastic thread. With increasing Relaxation (rebound) of the yarn-like structure becomes the stitch legs of the co-processed textured yarn pressed outwards in an arc shape. When using a multifilament yarn in the process, the individual capillaries are also pressed outwards in an arc, so that a yarn with a bulky Character arises.

The yarn-like structure is free of curls and has no tendency to twist. The stitch weave creates a Shifting the individual yarn or fiber components against each other is no longer possible. The power of form depends on the strength (titer) and elongation of the elastomer component used. The loose structure of the yarn-like structure enables maximum stretching of the elastomer component.

The figure shows the stitch pattern of the yarn-like structure obtained in the scheme, where 1 means one left stitch and 2 one right stitch.

example

A 2-needle tubular knitted fabric was knitted in the R / L technique on a flat knitting machine (pitch 7 E), with only one needle knitting in the front and in the rear needle bed. It became the following Material used:

1 thread polyamide dtex 44 f 10,

1 thread of polyurethane elastomer dtex 80 ply.

The elastomer thread was allowed to run in with a tension of 10 cN (I cN (centi Newton) corresponds to about 1 pond).

The yarn-like structure obtained shows the following properties:

Weight of the stretched, twine-shaped

Structure (g / 10 000 m, accordingly

dtex for normal yarns)

with a pre-load of 35 g 396

Weight of the relaxed, twine-shaped
Structure (g / 10 000 m, corresponds to
dtex for conventional yarns)
with a pre-load of 0.35 g

1123 Calculation

the extensibility

according to the following formula:

Measured value of the relaxed yarn-like structure Measured value of the stretched yarn-like structure

Money Λ _{100%: lg4%} .

Structure /

Extensibility of the gai n-shaped structure

eat by hand approx. 160%

Return of the yarn-like structure

of 100cm

when stretched (preload 35 g)

on 36 cm

in: relaxed state (0.35 g preload).

The plied yarn to be used according to the invention consists of at least one elastomer component and at least one textured or non-textured synthetic endless component or one Staple fiber yarn, at least one elastomer yarn and at least one textured or non-textured yarn run Endless yarn or a staple fiber yarn together in the knitting or warp knitting machine. It. can also two or more elastomer threads or continuous yarns or staple fiber yarns be plied with one another. Preferably In addition to the elastomer component, a textured one synthetic endless component used.

Polyurethane elastomer yarns primarily come into consideration as elastomer components, these ίο preferably in the titre range from dtex 45 to dtex 320 lie.

All textured filaments based on are suitable as textured, synthetic continuous components synthetic high polymer. In particular, textured polyamide and polyester yarns are used. They should preferably be in the titre range from 44 dtex to 200 dtex.

Flat knitting machines are suitable as knitting and warp knitting machines as well as circular knitting machines, loopers and warp knitting machines.

The knitting or knitting must be at least

2-needle operation, but the structure according to the invention can also be 4-, 6- and 8-needle.

The upward limit is only intended by that

2i strength of the yarn-like structure given.

When the elastomer component runs in, the

The pre-stretching of the elastomer thread can be varied within wide limits by using brakes, which makes it possible to improve the elastic properties

to influence largely in the yarn-like structure.

1 sheet of drawings

Claims (2)

Patent claims: 1. Highly elastic, knitted, yarn-like structure from a 2- or multi-needle mesh structure, characterized in that it consists of consists of a double-faced mesh structure and a plied yarn, which in turn consists of at least one elastomeric component and at least one textured or non-textured one synthetic continuous component or a staple fiber yarn 2. A method for producing a highly elastic, knitted yarn-like structure from a 2- or multi-needle mesh structure, characterized in that a plied yarn, the in turn, made of at least one elastomer component and at least one textured or non-textured synthetic continuous component or a staple fiber yarn, with variable inlet tension of the elastomer component meshed with a 2-font knitting or warp knitting machine.