Patent GB-1178445-A (GB)
Title: Improvements in and relating to Devices for Spinning Man-Made Filaments by means of Multi-Hole Spinnerets in a Wet-Spinning Process.
Inventor: HARTMANN WALTER
IPC: D01D5/06
Filed: 1967-09-20
Abstract: 1,178,445. Wet-spinning apparatus. FILMFABRIK WOLFEN VEB. 20 Sept., 1967, No. 42849/67. Heading B5B. A wet-spinning apparatus comprises a filter member 10 (Fig. 2), comprising a filter 2 and filter housing 3 (Fig. 1), secured to a gear pump 1, the housing 3 being provided over at least the upper part of its length with a surrounding jacket 4 sealed to the housing at its lower end, a spinning bath tube 7 detachably attached to the jacket, in a position above it, which tube is capable of being moved vertically in the drawing off direction (as shown in Fig. 2) and a spinneret 5 located on the nozzle of the filter member housing. As shown, the jacket 4 surrounds the upper third of the filter member housing, but it is desirable for the jacket to extend over substantially the whole length of the filter member housing in cases where an increase in the temperature of the spinning solution is necessary just prior to starting the spinning operation. As shown, the filter member 10 is vertically secured to the spinning pump 1, and the jacket 4 is provided with an inlet at its lower end which provides a conduit for conveying the spinning bath liquid from a supply tube 8 via a regulator 9 into the spinning bath tube 7. The spinning bath tube 7 is desirably mounted in an overflow device 12 in a manner such that it can be rotated and moved vertically. As shown, overflow device 12 is mounted on the cover 13 of stretching trough 11 by means of consoles 14 and 15. Thus when the spinneret is being changed, the overflow device 12, in which the upper end of the spinning bath tube 7 is so disposed, serves as support and guide for the spinning bath tube. Claws 16, which are mounted on the spinning bath tube 7, engage projections (not shown) on support devices 17, mounted on the stretching trough 11, when the tube 7 is pushed up, so that the spinning bath tube 7 is held in a specific position while the spinneret is being changed. In operation, the spinning solution is pumped from gear pump 1, through filter 2 into the space between filter 2 and the filter housing 3. From there it is pumped through spinneret 5 into the spinning bath tube 7, the spinning bath liquid entering the space between the jacket 4 and the filter housing 3 from the tube 8 and regulator 9. From there it passes through ports into the spinning bath tube 7, passing through the tube in a vertical direction, and carries the bundle of fibres which is formed to the opening of the tube 7 and thence to a drawing-off device. The liquid which overflows at the opening of the spinning bath tube flows into the overflow device 12 and thence into the return conduit 18. The apparatus is suitable for the wet spinning of, e.g. viscose or polyacrylonitrile filaments. The filter member 10, the spinning bath tube 7, and the overflow device 12 are preferably made of synthetic polymeric materials. Desirably, the filter member 10 is made of an epoxy resin, the spinning bath tube 7 is made of polyvinyl chloride or an epoxy resin and the overflow device 12 is made of polyvinyl chloride.