DE530803C - Method for remuneration of acetate silk threads - Google Patents

Description

Process for the compensation of acetate silk threads It is known that fibrous materials by soaking in swelling agents and then stretching in certain respects obtained improved properties. Thus, by soaking cotton with 17 per cent Caustic soda and washing under tension (mercerizing) obtain a material, which is essentially characterized by a higher gloss. Acetate silk threads are also used by stretching by about 15 to 25% with a swelling agent such as acetone, ethyl alcohol, Formaldehyde and glycerine made boil-proof.

It has now been found that by a far greater stretch Acetate silk threads can achieve a very special effect. Such elongations that are ten times greater than above can only be achieved by using dilute organic Acids achieve, while the threads are stretched with the well-known swelling agents already with a stretch of 30 ° h (mostly with a much lower stretch) tear and show large titre fluctuations even with even smaller stretching, the arise in that already existing or newly formed thinner areas of the thread getting thinner and thinner as you stretch.

The rayon threads produced up to now by the dry spinning process made from acetyl cellulose have an average strength of zoo to 120 g each Zoo deniers, in exceptional cases, strengths of a maximum of 150 g per zoo deniers were used achieved. If you now treat acetate silk with dilute organic acids, such as formic acid, Acetic acid, propionic acid or their mixtures, in a suitable concentration, stretches the silk loaded in this way and then removes the acid, possibly with increased tension, so can an extension of over zoo ° / a can be achieved. Get the threads so treated a much higher tear strength, and the denier thereof becomes large refined, and thus all the advantages that a finer titer brings are made simple Way received.

Example s A strand, according to the dry spinning process known in the literature manufactured acetate silk with a dry strength zoo g per zoo deniers, wet strength 50 g per zoo denier, single titer of the 7 denier thread is mixed with 40% acetic acid soaked, stretched out by tension to three times its length, while maintaining or increasing the tension with ever thinning acetic acid and finally Washed out with water and dried as usual. Have the threads so treated now one Dry strength of over zoo g per ioo de-. niers, Wet strength of over 100 grams per 100 denies, single thread of about 2.2 deniers.

Example 2 A strand of starting acetate silk as in Example i is used with 35% aqueous formic acid soaked, then evenly around 200 1110 its length stretched; then the acid becomes the strand while maintaining the tension or gradually displaced by water under increased tension, one obtains on this Make a silk with the same good properties as in example i.

The process can of course be combined with the spinning process use by treating the single thread in accordance with the process when spinning it can be, as described in the examples, on twisted or untwisted Perform strand and is also suitable for post-treatment of finished tissue.

Claims (1)

PATENT CLAIM: Method for tempering (increasing the dry strength, Increase in dimensional stability, refinement of the titer) of acetate silk threads, thereby marked that the silk with a. organic acid such as antic acid, acetic acid or mixtures of such acids, laden, stretched over about 50% and the acid while maintaining. or. Increase in the train, expediently in stages, removed will.