US2234763A - Crimped thread - Google Patents

Description

Patented Mar. 11, 1941 UNITED STATES PATENT OFFICE CRIMPED THREAD ware Application August 20,

1937, Serial No. 160,694

lin Germany August 22, 1936 4 Claims.

This invention relates to the manufacture of crimped yarn, and more particularly to the combining of a freshly spun artificial silk thread with a finished textile thread.

Various processes have already been proposed for obtaining yarn having crimped characteristics. Threads have been combined and/ or twisted together which, after the finishing or after-treating processes, possessed different shrinkage properties. For instance, it has been attempted to combine a freshly spun but not after-treated artificial viscose thread with some other finished textile thread, such as a cotton thread, or a finished artificial viscose thread. This combined yarn was then twisted, washed as much as necessary, after-treated, and then dried. Although the yarn thus obtained had remarkable qualities, the effect was not considered satisfactory, because the crimps and loops formed in the yarn were not of sufficient length.

It is therefore an object of the present invention to produce a crimped thread which is of superior quality.

Another object is to so combine two threads with each other that a thread having most satis factory crimp effects is obtained.

Other objects and advantages of the invention will be apparent during the course of the following description.

In accordance with the present invention, an artificial silk thread produced in accordance with the cuprammonium process, which has high shrinkage properties, is combined with a finished thread of any origin. In order to obtain best results, it is necessary to bring the two threads into contact with each other immediately after the extrusion of the cuprammonium thread by the spinnerette, i. e., prior to the deacidification of the spun thread, and when the latter is still in the alkaline state, because it was found that the cuprammonium thread in this state possesses its greatest shrinkage capacities. Owing to the plastic state of the freshly extruded cuprammonium thread, a slight agglutination by the latter and the companion thread occurs after contact with each other, which tends to improve the effect of the finished crimped thread. The combined thread is then deacidified, twisted, if desired, washed, and after-treated in the usual manner.

The finished thread which is combined with the freshly spun thread may consist of any known textile thread, such as thread made from cotton, linen, jute, wool, or silk; also finished artificial silk threads made from acetate, cuprammonium, or viscose solutions may be used.

A modification of an arrangement which may be used in carrying out the present invention is shown schematically in the accompanying drawing. The number I designates a spinning funnel by means of which a thread 2 is spun from a cuprammonium solution. The freshly spun cuprammoniurn thread emerges from the lower end of the spinning funnel through the opening 3 and enters into a pear-shaped vat having the form of a separating funnel which surrounds the opening it. The numeral 4 designates the finished textile thread which enters the vat 5 through the opening 6 and which is brought into contact with the freshly extruded thread 2 within the vat 5. The combined thread then leaves the lower end of the vat 5 by means of the opening I. Spinning bath from the spinning funnel may accumulate in the vat 5 up to the point indicated at 8, since it will always flow off together with the emerging thread through the opening 1. After leaving the vat 5, the combined thread 9 is drawn off by a take-up roller Iii which allows the thread to throw off any excessive spinning bath. The thread is then passed upwardly over a roller H where it may be deacidified with diluted sulphuric acid, decoppered, and otherwise after-treated. The thread is then led downwardly into a spinning pot [2 in which it is wound up and simultaneously twisted. The speed of the after-treating roller H, with respect to the take-up speed of the roller lil, may be adjusted in any desired manner; the roller ll may either have the same speed as the roller Ill, or it may rotate at a higher speed. A particular advantage is obtained if the roller I l is rotated at a slower speed than the roller Iii, because this arrangement allows the freshly spun artificial silk thread to shrink even more, which has a favorable effect on the formation of loops and crirnps in the finished companion thread.

Having now described the invention as required by the Patent Statutes, what is claimed is:

1. In a process for the manufacture of crimped yarn, the steps comprising extruding a cuprammonium solution into a coagulating bath to form an alkaline cuprammonium thread, and subsequently causing said thread to agglutinate with a finished thread in said bath.

2. In a process as set forth in claim 1 characterized in that the finished thread consists of an artificial silk thread.

3. In a process as set forth in claim 1 characterized in that the finished thread consists of a cuprammonium thread.

4. In a process as set forth in claim 1 characterized in that the finished thread consists of a viscose thread.

FRANZ HOELKESKAMP.

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