US1985603A - Process of winding threads and the like - Google Patents

Description

Dec. 25, 1934. R ELSSNER A PROCESS 0F WINDING THREADS AND THE LIKE Filed April l, 1932 I|II.IIII.IIIIIII.rII

I I l I I I I I I I I I I I I I I l l I II I f \I g I I I I I I l l I I I l I I l fl? l I I I I I I I I I l I I I l f I I I i y Patented Dec. 25, 1934 UNITED STATES n PROCESS F WINDING THREADS AND THE pRichard Elssner, Johnson City, Tenn., assigner to North American Rayon Corporation, New York, N. Y., a corporation of Delaware Application April 1, 1932, Serial No. 602,635

i Claims.

My present invention relates to a method of producing artificial threads andthe like, and has for its primary object the production of a more suitable yarn body than has been heretofore possible.

In the production of artificial silk and the like, according to the well known viscose process, the thread issues from a spinnerettev immersed in a suitable coagulating bath, and the thus newlyformed thread-like-material passes directly to a winding mechanism consisting essentially of a thread-guide and a rotatable forarninous or`perforated spool, said elements having a transverse movement one with relation to the other so thatl5 the thread-like material is wound cross-wise into a number of superimposed series of convolutions first in one then in the other direction.

One difficulty which had been encountered in the production of artificial silk and the like was a tendency toward a lack of uniformity in the character of the thread which tendency was caused by the fact that the material during the various processes is subjected to'unequal strains. For example in washing and dyeing of the freshly formed thread by drawing liquids through the' convolutions of the material into the interior of the spool unequal strains are set up, and, since the thread is already more or less tightly wound on the spools, the ready and equal penetration ofthe liquids through the yarn body is prevented. To overcome these diiliculties there has been pro- Lvided a method of winding the thread on spools which consists essentially in laying or winding the thread-like material4 into slack convolutions of such amplitude thatsubsequent shrinkage may occur without placing unequal strain on diierent portionsthereof. This is accomplished by the provision of a suitable means which imparts to the reciprocating thread 'guide an oscillatory movement. This results not onlyin a helical winding of the thread on the spool but at the same time undulations are produced in each helix.

I have found, however, that although such a winding hasproduced satisfactory results in the washing and dryingof the yarn, yet ity must usually be given a twist by placing the spool on a suitable twisting machine. I have found that vdue to the 'helical path in which the yarn has been placed on the spools by the above process, the outer convolutions thereof become very loose when the thread is being` twisted. This is due tothe peripheral speed of the spunspool and the centrifugal forces generated thereby.

tion to provide a novel method which will over-V come the difiiculty mentioned above.

A further object of my present invention is to provide a suitable method in which the undulations formed on the helicailly wound thread will- 5 be gradually reduced in amplitude thus reducing theflooseness of wind as the yarn body -is formed.

These and other objects will in part become obvious and in part be pointed out in the following specification and in conjunction with the 10 accompanying drawing, in which:

Figure 1 is a diagrammatic view of a typical lay or winding of the thread-like material on a spool at the beginning of a Wind;

Figure 2 is a view similar to Figure 1 illustratl5 ing in dotted lines the Wind after it has partially built upon the spool, the lay orwinding of the thread-like material at this point has had the amplitude of the oscillation suitably decreased;

Figure 3 is a view similar to Figures 1 and 2 20 illustrating in dotted lines the yarn body after it has been almost completely built up on the spool, one lay or winding of the thread-like material being shown with theamplitude of the oscillations reduced to a. negligible amount. g5

In the drawing in which like numerals of reference indicate like parts, 1 indicates the cylindrical winding surface of a spool, which may beused in the collecting of threads of artificial origin. The yarn body is indicated in dotted so lines by the reference numeral 3. The thread, or threads, 4, or the like, is laid in a series of undulations 5 crosswise, rst in one direction and then in the other direction, saidy series being superimposed.

In. Figure 1 it will be noted that the amplitude of the'undulation 5 is about twice that of the amplitude of undulations 'indicated in Figure 2 of the drawing. In Figure 3 the convolutions 5 are shown to have a'negligible amplitude.

'I'hus it is readily perceived how the 'amplitude of convolutions of the thread or filaments 4 may be gradually reduced as the yarn body builds up on the spool.

My invention consists in leading the freshly spun thread to a spool which is adapted to be rotated-by any. suitable mechanism. The thread g is laid on the spool by a reciprocatingguide and the guide itself is oscillated through a predetermined, arc. As the winding of the thread continues, I gradually decrease the arc through which the thread guide is oscillated so that when the winding is completed, the oscillation of the, thread guide will be decreased a' certain degree. Thusv the layers .of threads adjacent the spool will be loosely wound in helical undulationsof large amplitude permitting the shrinkage of the yarn against the spool without imparting any undue and unequal strains thereto. Since the outer layers, when shrunk, will bear against the yielding yarn body, the same amplitude of undulation will be unnecessary. Moreover the outer layers being more tightly wound, permit the yarn to be more easily unwound when placed in position forthe twisting step without impairing in any manner the twisting operation.

I may also discontinue the oscillatory movement of the thread guide during the last few moments of the spinning or winding operation. The results obtained thereby will be even more favorable from a twisting standpoint, as the layers of thread spun in the manner just described will act as a convenient starter when the spools .are placed in operative position on the twisting machine.

Although I have described my invention with vvspecific' relation to the production of artificial silk and the like bythe viscose process, it will be readily appreciated that my new method of spinning may be used with other processes and I therefore desire it to be understood that I am not limited except by the scope of the appended claims.

What I desire to claim as new is:

1. In a method for winding yarn upon spool, the steps of Winding the yarn thereupon in a series of superimposed layers extending in opposing helical directions, undulating the laments in. each layer so that a series of undulations in the plane of each helix is produced, and gradually decreasing the amplitude of the undulations as the thread body upon the spool increases in posing helical directions, undulating the filaments in each layer so that a series of undulations in the plane of each helix is produced, de-

creasing-the amplitude of the undulations as the thread body upon the spool increases in size, and windlng the outermost layers without any undulations whatever.

3. In a method of winding yarn bodies, the steps of laying up the yarn body in a series of helical windings in superimposed layers, undulating the laments of separate layers and decreasing the amplitude of the said undulations while the build-up of the yarn body proceeds.

4. In a method for winding yarn upon spools, the steps of winding the yarn thereupon in a series of superimposed layers extending in opposing helical directions, undulating the laments in each layer so that a series of undulations in the plane of each helix is produced, and decreasing the amplitude of the undulations as theV thread body upon the spool increases in size.

RICHARD ELSSNER.

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