DE2622704A1 - Synthetic thread for winding round another thread - comprises a partly: oriented high polymer thread - Google Patents

Abstract

Parent patent disclosed a thread for winding round another, by a set offive parameters, including degree of orientation. In this addn. the winding thread may be partly-oriented high-polymer thread (defined as one whose mechanical properties are improved by stretching, but whose breaking elongation is =160%). The partly-oriented thread is pref. a spun thread (i.e., one made by melt spinning without subsequent stretching). It may be spun with a drawing speed in excess of 2500 m/min or (at a lower speed) by a crystallisation spinning process (e.g. DT 2117659). The partly-oriented thread is particularly useful in integrated processes.

Description

Wrapping filament

The invention relates to a yarn made from an untwisted fiber ribbon and at least one filament yarn according to the patent that wraps around this fiber ribbon ....... (German patent application 24 28 483, internal file number HOE 74 / F 168).

The German patent ..... (P 24 28 483) relates to a yarn that by a set of five parameters, namely titre, elongation at break, reference force and shrinkage of the wrapping filament yarn and the degree of orientation of the staple fibers is.

Surprisingly, it has now been found that these demands to meet the wrapping filament yarn particularly well through partially oriented yarns permit. Partially oriented yarns are to be understood as meaning yarns whose mechanical Properties can be improved by stretching, but their elongation at break Does not exceed 1 6o%.

The elongation at break is as in the parent application according to DIN 53 815, paragraph 8.

Spun yarns, that is, spun yarns, have proven particularly useful as non-indexing yarns Yarns produced by a melt spinning process without subsequent stretching became. As withdrawal speeds, speeds above are preferred 2500 m / min. ("Schenllspinngarn") selected to be in the desired range of elongation at break to get.

Another equally preferred method for producing such partially oriented spun yarn represents the spin crystallization process, like it in the DOS 21 17 659 is described. In this case, the spinning train speeds are very low also partially oriented spun yarns received.

Depending on the application, the partially oriented yarns can also undergo a setting process are subjected to adjust the shrinkage to the desired wet.

According to the German patent .... (P 24 28 483) are called wraparound Filament yarns are preferably used with monofilaments. For economic reasons one will always spin milifilaments and these then according to processes known per se divide into monofilaments. This splitting can be done after melt spinning take place before winding, but the multifilament is preferably wound and thereby avoiding any twisting or other entanglement of the filaments. This multifilament is then used in a further processing stage divided and wound up as individual monofilaments. This sub-process can, if necessary be integrated with the fixation or with a post-stretching.

in special cases there is also a continuous connection to the Spinning process possible.

The advantage of partially oriented yarns is that they are easy to manufacture of these yarns and the possibility of using integrated processes.

Each further process step, such as stretching, also increases the risk of entanglement of the filaments of the originally spun multifilament, so that a division is made difficult or even impossible.

Surprisingly, it has been shown that high-speed spinning yarns due to Their high spinning tension is so small in spite of the blowing in the spinning chimney the intermingling of the threads have that dividing the multifilament into its Monofilaments is possible.

Partially oriented yarns made from linear polyesters have proven to be particularly effective. produced equally as fast-spinning yarns and by spin-crystallization. Other polymers also include partially drawn yarns, i.e. yarns that are not up to have been stretched to the maximum possible stretch ratio, can be used.

Surprisingly, all the others are of the partially oriented yarns desired properties of the wrapping yarn met, especially with regard to the strength properties.

The entangling filament yarns that are pleasing to the invention are not suitable only for the wrapped yarn according to patent ................... (German patent application 24 28 483), but for almost all wrapped yarns, regardless of whether the wrapped Yarn is a multifilam yarn or a spun yarn and regardless of whether the wrapping yarn is multifilament or monofilament.

Example Polyester filaments dtex 250f24 were spun at 2800 m / min and wound on spinning bobbins. The spinning temperature was 2870C and the specific The viscosity of the threads was 0.82. Frosted (0.4% TiO2) raw material was used.

The coils were then in a subsequent operation at 500 m / min unrolled, divided into individual filaments and wound up separately. This The dividing process can be carried out with a Filament Splitting Winder KSW 32 from Karl Mayer, Textile machine factory.

For some of the bobbins, the multifilaments were made before dividing Tempered under tension with one heated iron, with another Part of the heat treatment was carried out using a hotpin (70 mm).

These temperature measures changed the elongation and shrinkage of the partially oriented Threads. The results are shown in Table 1.

Treatment, inlet, boiling temperature, tension, shrinkage, elongation Starting filament 53.5% 174% iron: 1000 33 pond 53.9% 139% 1400 24 7.3 % 47% Hotpin 800 17 p 13.3% 26% -1000 17 10.0% 28%

Claims (4)

PATENT CLAIMS 1. Wrap yarn after. Patent .... (German patent application 24 28 483, internal file number HOE 74 / F 168) characterized in that the surrounding Filament yarn consists of a partially oriented yarn made from synthetic high polymers. 2. Umwindegarn according to claim 1, characterized in that the partially oriented Yarn consists of a spun yarn. 3. Wrap yarn according to Claims 1 and 2, characterized in that the spun yarn with take-off speeds over 2500 m / min. was produced. 4. Wrap yarn according to Claims 1 and 2, characterized in that the spun yarn was made by a spin crystallization process.