US2076802A - Method of spinning and winding artificial silk filaments - Google Patents

Description

April 13, 1937. H. G. VAN DER WAALS ,0

METHOD OF SPINNING AND WINDING ARTIFICIAL SILK FILAMENTS Filed Nov. 24, 1935 l l'l dyestufis is stronger at. the exterior portions of ficial thread is increasingly more and more Patented Apr. 13, 1937 UNITED STATES 'METHOD OF SPINNING AND ARTIFICIAL SILK FILAMENTS Hendrik Gerardus van der Waals, Arnhem, Netherlands, assignor to American Enka Corporation, a corporation of Delaware Application November 24, 1933, Serial No. 699,631 In Germany October 13, 1933 3 Claims. (01. iii-54 The present invention concerns a new method of spinning and winding artificial silk filaments. More especially the invention has to do with a new and novel method for decreasing the diiference in the dyeing afiinity of artificial silk threads between the exterior and interior portions of spun packages, such as threads wound on spinning spools or in cake form. I

One object of the present invention is to provide a method which will give the threads running from the spinning nozzle to the collecting device, such as spool or spinning centrifuge, a certain amount of stretch, and change the intensity of stretch from the beginning to'the end of the winding process. Another object of the present invention is a method for giving theireshly spun thread on its way between the spinning nozzle and the colleeting device a predetermined stretch, increasing the amount of stretch from the beginning to the end of the winding process and providing means copper-process and the like it is known that the thread packages obtained, particularly bobbin packages, but also cakes produced in the so called spinning centrifuges, show. variously strong the bobbin packages and at the interior portions 'of the centrifugal packagesl In order to compensate these various aflinities to dyestufis quite a numberof suggestions have been made, which,

however, havenot brought complete success.

According to the present invention it has been made possible to solve this problem in a very efl'ective manner with new'means. According to this a special positively'driven godet or drawwinding-m'ember. This draws'ofi the thread as much as possible without slip .and delivers it to the winding member running at a certain, e. g., constant winding speed. The important thing in the invention is that the ,drawing-ofi speed of the interposed godet is controlled during the winding process in sueha manner that the artistretched between the interposedgodet and the real, positively driven winding member. In this way it is accomplished that the exterior portions of the spinning'bobbinpackages arelwound with threads with greater stretch than otherwise, and 1 the interior portions of thespinning cake are also ing-ofi roller is interposed in .front of the real constant during the winding process.

the winding process in such a way that a very extensive compensation in the afiinity to dyestuffs is achieved. According to theinvention this is done, in that during the winding the interposed positively driven drawing-offroller or godet is made to run increasingly slower. This can be accomplished with various means, which per se arealready known in the industry, for I example by so-called 'conoid drives.

. For the better understanding of the invention attention is drawn to the attached drawing representing three forms of execution of the invention and the following description.

Fig. 1 shows diagrammatically the spinning arrangement for the so-called spool-spinningprocess;

Fig.2 shows also the spinning arrangement for tional friction roller;

Fig. 3 shows the spinning arrangement for the centrifuge-process.

. the spool-spinning-process in using an -addi-,

According to Fig. 1 the thread rises from the spinning nozzle d situated in the spinning bath on to the interposed, positively driven drawingoff roller R and from there it reaches via the transport roller r and through the traverse guide F the spinning bobbin S. The bobbin S is drivenin a known manner in such a way-that the draw-- off speed of the thread remains approximately The positiveiy driven and slip-free workingdrawing-bfi roller R is driven in such a; way that it receives an increasingly slower draw-off speed in the course of the winding process.

According to the arrangement represented in Fig. 2 the operations are fundamentally the same as in Fig. 1. The drawing-off roller, which is interposed and driven positively and working at an increasingly diminishing draw-01f speed, is a marked R1 in this case.

Between this drawing- I than the peripheral speed of the spinning bobbin,

whereby the thread can slip over the roller R2.

In Fig. 3 it is a matter of producing centrifugal artificial silk and the positively driven winding member comprises the positively driven delivery godet Ra, which per sevis always present, and the spinning pot T. The prepositioned godet which is positively driven and works at an increasingly diminishing transport speed during the. spinning process is here marked R1.

Having now described my invention what I claim ist I 1. The process of producing artificial silk thread and the like of substantially uniform denier and having improved dyeing properties which comprises extruding a celluiosic solution and passing the same through a setting bath, withdrawing the thus formed thread from the setting bath by passing the same around a godet and thereby propelling the thread without gliding friction, passing the thread in its path of travel to a bobbin over another-godet operating at a peripheral speed greater than the linear speed of the thread at that point so that a gliding contact occurs between the thread and the second godet, collecting the thread at the bobbin at a greater linear speed than' the peripheral speed of the first mentioned godet but at a lesser speed than the peripheral speed of the second mentioned godet, and-gradually decreasing the speed of the first mentioned godet during the winding of the thread, whereby objectionable characteristics resulting from contraction are avoided.

2. The process of producing artificial silk thread and the like of substantially uniform .denier and having improved dyeing properties which,com-

aovaaoe prises extruding a cellulosic solution to form a thread, giving the thread different linear speeds at predetermined spaced points in its path of travel by passing the same after formation of the with the resultant increasing elongation of the threadwhile it is being wound on the bobbin whereby objectionable characteristics. resulting from contraction are avoided.

3. The process of producing artificial silk thread and the like of'substantially uniform denier and having improved dyeing properties which comprises extruding a cellulosic solution into a spinning bath to form a thread, withdrawing the thread from the spinning bath by means of a driven roller, passing the thread to a bobbin and collecting the same thereon at a substantially constant linear speed greater than the initial linear speed of the draw-off roller'so as to stretch the thread, and during the spinning period imparting an increasingly slower draw-oi! speed to the roller whereby succeeding portions of the thread are increasingly stretched as the thread is wound on the bobbin.

HENDRIK GERARDUS VAN DIR WAALS.

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