US1916831A - Method for the manufacture of artificial silk - Google Patents

Description

July 4, 1933.- R. ETZKORN METHOD FOR THE MANUFACTURE OF ARTIFICIAL SILK 5 1 5 WW 1 W YY\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\V\ Emma (M ,Zzudalflizfiwvz.

Patented July 4, 1933 UNITED STATES PATENT OFFICE RUDOLF E'IZKORN, OF OBERBRUCH, GER-MANY, ASSIGNOR TO AMERICAN GLANZSTOFF CORPORATION, OF NEVT YORK, N. Y., A CORPORATION OF DELAWARE METHOD FOR THE lvfANU'FACTURE OF ARTIFICIAL SILK Application filed March 25, 1932, Serial No. 601,296, and in Germany April 11, 1931.

My present invention relates to improvements in the manufacture of artificial silk and the like by the spinning pot or centrifuge method and more particularly to a method for reducing the power required to rotate the spinning pots or centrifuges during the spinning operation.

In my co-pending application, Serial Number 596,040, filed March 1, 1932, I have described a method of an apparatus for the manufacture of artificial silk in which the thread is collected in a spinning pot rotating in a substantially evacuated chamber and my present invention relates to an nnproyed process which will prevent air from entering the spinning pot chamber so that the Vacuum may be maintained in a more satisfactory manner.

It is therefore an object of my present invention to provide an improved process for the manufacture of artificial silk by leading the spun thread into a centrifuge located in an evacuated chamber together with a liquid whereby the ingress of air into said chamber is prevented. Other objects will become more apparent from a study of the follow-- ing description.

The accompanying drawing is indicative of the manner in which this process may be carried out, and shows, in section, a spinning pot arrangement whereby the ingress of air is prevented.

A spinning pot 10 is driven by a motor 11 through a shaft 12. Both the motor 11 and spinning pot 10 are housed in a suitable casing 13 which is divided into two chambers by a partition 14. An opening 15 is provided in the partition 14 to accommodate the shaft 12. The motor may rest, for example, on resilient supports 16. A cover 17 resting on a gasket 18 may be provided for the top of the casing, the cover 17 seating on the gasket 18. This cover 17 is provided with suitable openings in which is positioned a packing means 19 having a shoulder 20 formed thereon. Located between this shoulder and the cover is a gasket 21 which forms a suitable seal between the packing means and the shoulder. As shown, the packing means is provided with a centrally located bore 22 in which is located the spinning tube 23 attached to an arm 24 for imparting reciprocattion motion thereto. A vacuum line 25 is provided in the spinning pot chamber so that a vacuum may be readily created therein. The thread 26 is shown being led into a funnel 24 which is inserted in the top of the spinning tube 23 through which the thread passes.

A suitable cellulosic solution is extruded into a coagulating or hardening bath and the thread thus produced is led into a spinning pot or centrifuge rotatably mounted in an evacuated chamber. The thread passes into the chamber through a narrow opening formed therein and is placed in the rotating spinning pot by means of any conventional reciprocating thread guide. ater or spin ning bath solutions are led continuously with the thread through the opening in the chamber and thus air is prevented from entering the chamber. Such use of water or treating liquid is by no means detrimental to the spinning operation since the presence of such liquids is desirable in all wet spinning processes where acids, lyes etc., are used.

The entrance of the liquids into the centrifuge chamber cuts down the energy consumption to a minimum. Since the amount of air which can enter the chamber, according to the above described method, is very small, the use of expensive and high powered vacuum pumps to create the desired vacuum is avoided. The liquid which has been sucked in can be removed either by the vacuum pumps or can be readily removed by liquid suction pumps or other suitable means.

Having now described my invention as required by the patent statutes, what I desire toclaim as new is:

1. A process for the reduction of the energy consumption for rotating spinning pots which comprises enclosing the spinning pot in an evacuated chamber, leading the thread into said chamber through a narrow opening and in maintaining a constant flow of liquid through said opening during the spinning operation whereby the ingress of air into said chamber is prevented.

2. In the manufacture of artificial silk and the like by the pot spinning process, in which the spinning pots are positioned in an evacuated chamber, the step of maintaining a constant flow of liquid into said chamber whereby the ingress of air thereinto is prevented.

In witness whereof I afiix my signature.

RUDOLF ETZKORN.

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