US1968356A

US1968356A - Wet treatment of artificial silk cakes

Info

Publication number: US1968356A
Application number: US577834A
Authority: US
Inventors: Schmidt Kurt
Original assignee: North American Rayon Corp
Current assignee: North American Rayon Corp
Priority date: 1930-11-28
Filing date: 1931-11-28
Publication date: 1934-07-31
Anticipated expiration: 1951-07-31

Description

July 31, 1934. K. scHMlD-r WET TREATMENT OF ARTIFICIAL S'ILK CAKES Filed Nov. 28, 1951 Patented July 31, 1934 WET TREATMENT OF ARTIFICIAL SILK CAKES Kurt Schmidt, Elberfeld-Grenze, Germany, as-

signor to North American Rayon Corporation, New York, N. Y., a corporation of Delaware Application November 28, 1931, Serial No. 577,834 In Germany November 28, 1930 4 Claims.

The invention relates to the wet treatment rof artificial silk cakes, which have been manufactured by the pot spinning process.

More particularly the invention comprises a process for the treatment of cakes, by which the treatment liquids are conducted along the walls of the cakes.

Further details are to be seen from the following description:

l0 According to numerous, previously known methods of washing cakes, the washing and after-treatment liquids are conducted through the cakes. According to the present invention, however, the liquids are substantially not conducted through the cakes, but are made to flow along the inside and the outside of the artificial silk cakes. The wet treatment is in this case practically dominated exclusively by the powers of lixiviation or diffusion. For carrying out the process the cakes, for example the Viscose silk cakes, are placed into a liquid container and preferably placed pipe-like one above the other. By means of suitable inlet pipes in the bottom of the container the treatment liquid is allowed to enter, to now along the inside and outside surfaces of the cakes and then, for example, to flow away by running over. Y

The present invention is set forth in the accompanying drawing, in which Figure 1 is a cross-sectional View of a portion of the treating vessel with a cake shown therein, and

Figure 2 is a perspective view, partially in cross-section, disclosing the manner of operation of the invention,

Referring to the drawing the invention is more particularly explained in the following:

In Fig. 1 the treatment vessel is marked l, an inlet pipe 2 for the treatment liquid, through which the liquid is conducted from below and enters into the treatment vessel at the topover the edge of the pipe and into the inside of the cake 4, which is surrounded by a fabric 6 and supported by an elastic shell of wire net-work 3. The liquid then flows downwards along the inner wall of the cake, enters at the bottom front side of the cake, where the cake is supported in an appropriate manner', into the outside of the vessel 1 to rise there along the outside of the cake and then to flow off over the edge of the vessel through the overflow pipe 5.

According to Fig. 2 two cakes, which are also enclosed in porous fabric 6, are placed one above the other in the circular vessel 1 and secured in their places by the load ring 7.. Between the load ring '7 Vand the front side of the upper cake a ring 8 made of material porous to liquids is inserted, which facilitates the penetration of the treatment liquid to the front side of the cake. As in Fig. 1 the inlet of the treatment liquid takes place through the pipe 2 from the bottom. The liquid flows over the edge 9 of the pipe 2,V flows through the circular space l0 between pipe 2 and the inside wall of the cake, flows under the cake supporting plate 1l into the outside circular space 12 between the outside surface of the cake and the wall of the container 1, flows in this upwards and over the edge 13, which lies somewhat lower than the edge 9 of pipe 2, into the pipe 5 and from this is discharged by the outflow pipe 14.

Many cakes can be exposed, distributed next to eachother, in the same treatment vessel on suitable perforated grids and several cops can be placed column-like one above the other. In the same way a series of suchgrids can be arranged one above the other in the Vsame box. In this case the treatment liquid is allowed to flow in one stream through the whole box either from the bottom to the top or from the ktop to the bottom. In order that the cakes, especially at the first contact with the treatment liquid, remain firmly in position, they can be held in the desired position by suitable devices, such as load rings, elastic inner stiffenings porous to water, or the like. The several cakes can also before treatment be wound round with holding threads in the well-known manner or enveloped in porous cloths tol prevent the single threads and thread layers from being swept away in the wet treatment.

Having thus described my invention, what I. claim is: Y

1. In a process for the wet treatment of articial silk cakes the steps of conducting the treating liquids downwards onthe inside of the cake,

, underneath the cake and upwards on the outside of the cake and then leading off the liquids.

2. In a process for wet treating cakes of artificial filaments, threads, etc., the steps of supporting the cake, passing a treating liquid downwardly over the inner face of the cake, and then passing the liquid upwardly over the outer face of the cake.

3. The process as set forth in claim 2, wherein the cake is wrapped prior to the wet treatment thereof.

4. The process as set forth in claim 2, wherein a plurality of cakes are treated simultaneously, the cakes being arranged in superimposed position with respect to each other, and pressure being applied to the upper edge of the topmost cake.

KURT SCHMIDT.