US1867617A - Evenness of shrinkage - Google Patents

Description

'Patentecl Judy is. race in am;

acacia 'FHQ RID ELSSNER, OF J'bHNSOlS! TEISNESSEE, ASSIGNOR TO-AJWERICAN GLANZ- STOFF COBPQBATION, OF NEW YORK, N. Y., A CORPORATION OF DELAW i mass or smnaen 23o Drawing.

My present invention concerns a new methd of wet-treating artificialfilaments i. e. filaments formed synthetically, specifically from cellulosic solutions.

One object of my invention is to so wettreat filaments that an even shrinkage results.

' For matter of convenience the present application is described with respect to the viscose process, but it must be understood that my new invention may be used in any process where spun filaments must 'be wettreated.

In the manufacture of filaments, and films,

M from a viscose solution, the extruded product is usually passed through an acid bath in order that it may be hardened, or ,precipitated. In the .case of artificial viscose filaments, for example, the product is usually wound upon foraminated or perforated spools or bobbins. The filaments must then be deacidified, desulphurized, and washed. When drying these yarns upon the perforated spools an uneven drying and shrinkage of the filaments usually results. This causes unevenness in the quality of the yarn produced, and aifects the dyeing properties. According to my new process, a series-of dryings is accomplished, and thus an evenness of shrinkage results.

My process, with respect particularly to viscose yarns, for example, is as follows:

The yarn, wound upon a foraminated spool is wet-treated in the usual way, and then dried. The yarn body is then re-wet, and

dried. Then the filaments are rewound or twisted, onto another similar spool, in such a manner that a loose yarn body is obtained; and again wet and dried. Then a fourth w wetting and drying is performed and the resulting filaments have been found to possess a technically even shrinkage and the corresponding desirable dyeing properties.

The drying may be accomplished in any {ell-known manner, and I do not wish to ave t eofd Iwishto'havem- 'ine ti dh limit dg fnly y v n pended claims. 1 The wetting may be accomplished by my present invention limited to any I by the scope of the ap- Application filed August 29, 1931. Serial 1V0. 560,225.

spraying with water or aqueous solutions, H

or by dipping in water 'or aqueous solutions. claim:

1. In a process for treating wet artificial filaments wound upon a spool or bobbin, the

steps of drying, rewetting and redrying the filaments, rewinding onto another spool or bobbin, rewetting, redrying, rewetting and redrying the filaments.

2. In a process for'obtaining an evenness of shrinkage of spun filaments, the steps of winding the same on a spool or bobbin, wettreating and drying, rewetting and 'redrying the same, rewinding onto another similar spool or bobbin, and repeating the 'wet: ting and drying a plurality of times.

3. In'a process for obtaining an evenness of shrinkage of spun filaments, the steps of -winding the same on a spool or bobbin, wettreating and drying, rewetting and redrying the same, rewinding and twisting onto another similar spool, and repeating the wetting and drying until altogether four dryingshave been performed.

4. In a process for obtaining an evenness of shrinkage of spun filaments, the steps of winding the same on a spool or bobbin, wettreating, and drying, rewetting and redrying the same, rewinding onto another similar spool, and repeating the wetting and drying a plurality of times while thereon.

In testimony whereof I aflix my signature.

' DR. RICHARD ELSSNER.