Patent GB-862833-A (GB)
Title: Improvements in or relating to spinning apparatus for the production of artificial filaments
IPC: D01D5/06
Filed: 1959-01-09
Abstract: 862,833. Wet-spinning apparatus. PHRIX-WERKE A.G. Jan. 9, 1959 [Jan. 11, 1958], No. 942/59. Class 2(2). The bottom of a tank for containing the coagulating liquid used in the production of artificial filaments, e.g. from viscose, is adapted to receive a number of spinneret and spinneret holder assemblies extending into the tank, is detachably connected to the walls of the tank, and is adapted to be tilted from its normally horizontal position after it has been detached from the walls and after the walls and the bottom have been moved apart a distance sufficient to provide the necessary clearance to permit such tilting, so that the spinneret and spinneret holder assemblies may be inserted in the bottom of the tank and may be accessible when in this position. As shown in Figs. 1 and 3, the convex separable bottom I of a composite tank 7 carries a large number, e.g. 250, of closely spaced spinneret and spinneret holder assemblies 2, the longitudinal axes X of which are arranged radially with respect to the centre of curvature of the tank bottom. The filament bundles 10a extruded into the tank during spinning are led over a grooved roller 10 to treatment zones. The bottom 1 is pivotable about horizontal shafts 3 from the operative horizontal position into a nearly vertical position 1<SP>1</SP>, means being provided for locking the bottom in these positions. The lower end of each spinneret and holder assembly is connected by means of a flexible pipe 5 with a spinning pump mounted on a wall 6 and driven as described in Specification 862,832. The lower ends of the walls 7a have external flanges 8 which are bolted to the flange 1a of the bottom I, the joint being sealed by a resilient gasket. As shown in Fig. 4, each spinneret and spinneret holder assembly 2 comprises a tubular shell 11 screwed into a tapped bore 1c in the bottom 1 and having at its lower end a collar 12, the joint between the collar 12 and the bottom 1 being sealed by a gasket 13. A cup-shaped spinneret 17 is held in position at the top of the shell 11 between the top of a sleeve 15 and the top of a tube 18. The lower end of the sleeve 15 is screwed into the collar 12 and is connected by means of a coupling 26 with one of the flexible spinning solution feed pipes 5 so that the solution may flow to the spinneret 17 through tube 18. A protecting cylinder or sheath 24 provided with holes 25 for the entry of coagulating liquid is a push fit on the lower portion of the shell 11. The spinneret face 17b is covered by a cap 30 of rubber which, at the commencement of spinning, is forced off the spinneret by the pressure of the spinning solution and which then rises to the surface of the coagulating bath carrying the end of the bundle of extruded filaments with it, thereby facilitating threading up of the filament bundles. The apparatus enables a large number of closely spaced spinnerets to be located at considerable depth in the coagulating bath in order to economise floor space without the initial threading up operation being thereby rendered difficult. A modified form of spinneret and holder assembly is also described.