US1950471A - Manufacture of crepe yarns - Google Patents

Description

Patented Mar. 13, 1934 AC'EFURE F CREPE YAENQ Eduard Boos, Oberbruch, Kreis fieinsberg, Ger= many assigncr to American Glanzstofi Cor= poration, New York, N. K, a corporation of Delaware No Drawing. Application March 1, 1932, Serial No. 596,162. In Germany March 24, 193i.

2 Claims. (6]. 28-1) My present invention concerns the production of crepe yarn from artificial filaments.

One object of the invention is to provide a novel, yet simple, method for the production of crepe yarn.

Other objects will become apparent from a consideration of the following specification.

According to one process by which I produce a crepe efiect on artificial filaments, specifically tions of the yarn, at the same time removing the sulphur therefrom. I have found that undesulphurized yarns possess noted shrinking tendencies and thus the production of a crepe effect yarn is facilitated.

According to another process wherebyfproduce crepe effect yarn, I make use of untwisted artificial filaments. Ordinarily, when twisted filaments are to be used in the manufacture of crepe yarn, it is necessary to supply certain of the filaments with a decided left-hand twist. When using yarn which has been twisted, this twist must be compensated for when the crepemaking twist is applied. I overcome this difiiculty by leaving the original silk untwisted and collecting it, as it is newly spun, directly upon the usual cylinders, spools or reels. This un-' twisted yarn while upon these holders may be suitably washed and dried; It may then be run directly upon twisting spools, and the proper leftor right-hand twist applied, whereupon it may be used in the manufacture of crepe effect yarn. By proper it is meant that the thread lyes which act to shrink the undesulphurized porduced.

have found that the sulphur acts as a bindingor sizing agent and enables the handling of the filaments while they are thusuntwisted.

In the event that this present process is to be used in connection with the production of viscose filaments according to the spool spinning process, it has been found that several steps will be eliminated from the usual process and thus danger of damaging the artificial filaments by handling is decreased. Spool yarn is that which is wound, after production, directly upon a spool. While upon this spool, which may be perforated, for example, the yarn is after-treated without any intermediate rewindings. According to my present process, I lay the untwisted yarn directly" upon the spools, treat it by washing, but do not desulphurize it. Thus, as is pointed out above, the sulphur remainsin the filaments to act as a sort of a hinder or sizing and enables the filaments tube handled intheir untwisted state.

The sulphur may be removed from the crepe yarn without anydifiicultyafter it has been woven. After the desulphurization of the woven yarn occurs, the shrinkage of the filaments is occasioned, and the desired crepe effect is pro- Having now set forth my invention as required by the statutes of the United States Patent Ofiice, what I desire to claim is:

1. In the manufacture of crepe effect fabrics, the steps of producing viscose filament-s, wind- 35 ing them while untwisted upon spools, washing the untwisted filaments without desulphurizing, applying high leftand right-hand twists to the filaments thus produced, making them up into a fabric, and then desulphurizing the resulting fabric.

2. In the manufacture of crepe effect fabrics, the steps of producing viscose filaments, wind- .ing them while untwisted upon spools, washing the untwisted filaments without desulphurizing,

applying high leftand right-hand twists to the filaments thus produced, making them up into a fabric, and then desulphurizing the resulting fabric through the use of a dilute caustic so1utiOD. EDUARD BOOS.