US1812592A - Means of stretch-spinning artificial filaments - Google Patents

Description

June 30, 1931. c. HERRMANN Y 1,312,592

MEANS OF STRETCH SPINNING ARTIFICIAL FILAMENTS Filed May 3, 1930 Fig.1-

32 2 iii 5 #10 11: 2:12; 1 17 {5 l v 6 B 6- j 5 i Di 1% 6 i Eiql- I V I Q I gwwmtoc' abbozmq Patented June 30, 1931 UNITED STATES PATENT? OFFICE.

CONRAD HERRM'AN N, OF WUPPEIRTAIe-ELBERFELD, GERMANY, ASSIGNOR TO AMERICAN GLANZSTOFF CORPORATIOIV, OF NEW YORK, N. Y.

MEANS OF STRETCH-SPINNING ARTIFICIAL FILAMENTS Application filed May 3, 1930, Serial No. 449,413, and in Germany April 29, 1930.

Artificial threads are generally produced in the following manner; a spinning solution is extruding through a spinning nozzle and the extruded filamentscoagulate either in the air or in special precipitating baths and are then wound on ,a take-up spool in the form of thread. This so-called spinning process requires a certain tension of the threads as well as a stretching of the same between the nozzle (i. e. the spinnerette) and the take-up spool. Upon the degree of this tension i. e. the stretching, depend the different qualities of the thread, such as the cross section, the size, the cross sectional form, the dyeing qualities and the physical properties such as firmness and elasticity. In the usual and well known spinning process as the tension affects the length of the thread which lies between the spinnerette and the take-up spool, or, if a roller has been installed between these two ppints,-this will affect the length of the thread tween the spinning nozzle and the roller or between the roller and take-up spool. In all of these cases a comparatively small stretch only, could be obtained, because the newly-produced thread is stretched between two points and is considerably burdened by its own weight. This process was, therefore, not very successful.

The new invention, as outlined on the following pages, produces a slow stretching of the thread between the spinning nozzle and the take-up spool. According tothis inventlon the newly spun thread is wound on a number, the minimum being three, of rollers, cylinders, spools, or shafts, arranged in seuence, which run with an increasing circumerential speed and between which the thread isforcibly stretched several times owing to the adhesion of the thread to the stretching devices (rollers, spools, etc.).

It has been observed that with this multiple sub-division of the stretching device the thread is handled in a more gentle manner and runs less risk of being damaged than if it had been stretched in one operation and by a single stretching. On the other hand.

the installation of numerous stretching divisions makes a larger total tension possible than if only one stretching division had been used. The process and the total effect thus obtained is not a mere ranging together of similar processes. Owing tothe precipitating effect of the bath on the'thrcad and the further automatic changing of the thread itself, the ensuing stretching does not affect the thread in the same manner in which the previous stretching did. Betweentwo stretching shapes the thread has time to recover from a stretching and is. therefore, more able to stand being subjected to another limited stretching step.

As an example of the operation of this process, a drawing accompanies this specification, in which;

Figure 1 is an end plan View of the device in operation, and

Figure 2 is a side view corresponding to Figure 1.

In Figures 1, and 2. A is a fixed head or case or shell in which the geared wheel C, driven by the shaft B, runs. This'gear wheel C drivesseveral smaller gear wheels D D etc. In the device shown six of these wheels are shown, but the invention is. of course, not limited to this specific number. These gears run on "axles housed in the case A. these axles beingelongated, (Figure 2). Outside the case A these elongated axles carry several small rollers E E- etc. Six rollers are shown tocorrespond with the six wheels 1),, D etc., but are merely illustrative of one enibodiment of the invention.

By the rotation of the shaft B the several gears D to D are actuated to rotate the rollers E to E in the opposite direction to that of the shaft B. The gear transmission is so arranged that the roller E runs a little faster than roller E roller E, runs a little faster than roller E etc., so that, finally, the roller E, has a greater speed than any of the other rollers. Instead of changing the gear trans? mission in order toobtain this increased speed 0f the several rollers, it may be obtained by maintaining the sizes of the various gear wheels D -D constant, but changing on increasing the diameter of the rollers El -E By this means an ever-increasing circumfen' ential speed is obtained. The spinning process then takes place in such a manner that the having passed the greatest stretching.

thread G coming out of nozzle F is laidaround the stretching means so that a moderate stretching on the relatively slowly moving roller E takes place. which stretching is then increased gradually by the subsequent rollers E E etc. up to E and the thread is only taken up by the take-up spool H aftgr s roller E runs faster than roller E the thrcad is therefore stretched very little between these two rollers but .receives a greater may be reeled around each of the difi'erent rollers E E etc. The number of rollers is given in the enclosed example as 6 but any number of rollers may be chosen but not less than three in order. to obtain at least two stretching degrees. On the other hand. the number of rollers can also be increased by installing several of such stretching means in sequence instead of using a single roller. A stretching device may be so arranged that a stretching roller with its gear wheels can be exchanged, or the stretching rollers only or, as another alternative, the gear wheels driving the rollers may be exchanged.

The process and the installation can be used not only for the spool-process and rollerprocess but also for the centrifugal-process, by which means the roller H, marked in the drawing, may represent the transmission roller or take-up spool. from which the thread goes down into the spinning centrifuge.

Claims:

1. An apparatus for stretching filaments comprising three or more drawing rollers, each having a driving gear positioned to contact with a main driving gear, said drawing rollers being of different diameters and positioned so that the rotation of the main driving gear will give the rollers progressively increasing peripheral speeds around the group.

2. An apparatus for stretching artificial filaments comprising a common driving gear, three or more drawing rollers positioned 4. An apparatus for conditioning artificial silk, comprising a spinning nozzle, a thread assembling device, three or more drawing rollers between the spinning nozzle and the assembling device, said drawing rollers having individual driving gears contacting with a common circular driving gear and being adapted to be rotated by said circular driving gear at progressively increasing peripheral speeds around the group.

5. Anapparatus for conditioning artificial filaments, comprising a spinning nozzle, a thread assembling device, three or more drawing rollers positioned around a common driving gear so that the thread passing from the spinning nozzleto the assembling device may pass around each of the drawing rollers in the group, said drawing rollers being driven at progressively increasing peripheral speeds from the first to the last in the group with which the thread contacts.

In testimony whereof I atfix my signature.

CONRAD HERRMAN-N.

thcreabout, said drawing rollers being-driven by said common driving gear but at different peripheral speeds.

An apparatus for stretching filaments comprising three or more drawing rollers, each having an individual driving gear positioned to contact with a main driving gear,

the said individual driving gears being of different diameters so that the drawing rollers may be rotated by the main driving gear at difierent peripheral speeds.

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