Patent GB-484605-A (GB)
Title: Apparatus for manufacturing artificial silk
IPC: D01D5/18
Filed: 1936-11-09
Abstract: <PICT:0484605/IV/1> <PICT:0484605/IV/2> <PICT:0484605/IV/3> <PICT:0484605/IV/4> Apparatus for making artificial silk, particularly from viscose or similar solutions, comprises a rotary nozzle and a rotary coagulating bath container connected therewith, the whole of the coagulating liquid being supplied under pressure to the container at the end thereof enclosing the nozzle through a passage taking part in the rotary movement, and the container being provided with a narrow delivery orifice for the thread and the coagulating liquid.  The size of the delivery orifice of the coagulating bath container, the speed of rotation of the system, and the pressure under which the coagulating bath is supplied are such that the formation of the surface of the bath into a paraboloid shape is avoided and the threads are thereby coagulated within the bath so far that sticking of individual filaments is avoided.  The container may be reduced in cross-section gradually or abruptly from the nozzle towards the delivery end.  It may be sub-divided into sections removably connected together.  To avoid twisting of the thread in the coagulating bath, the container may be provided at its top with a thread-brake device taking part in the rotary movement.  The pipe carrying the spinning solution may be constructed and mounted so as to set itself with its centre of gravity in the axis of rotation.  As shown in Figs. 1 and 4, the spinning device comprises a rotary body 1 with axial bore and a cup-shaped portion 2.  The rotary body 1 is mounted on a step bearing 3 and anti-friction bearings 4.  Viscose is supplied through bore 5 of the bearing 3.  A tubular container 7 mounted on the cup 2 is closed at the top by a cover 8 with orifice 9 and slot 10.  The body 1, spinning nozzle 6, and container 7 are rotated by means of pulley 23.  Coagulating liquid is supplied from pipe 16 in tangential direction into annular passage 13 so that it rotates in the direction of rotation of the body 1.  It then flows through passages 15 into the cup 2 and container 7 in which it has practically no rotary movement relative to the filaments issuing from the nozzle.  The filaments pass through the brake-device 28, stationary guide 29 and then to the collecting device 30.  Twisting takes place between brake 28 and guide 29. Coagulating liquid issues from container 7 through holes 11 and the orifice 9.  In order to ensure efficient contact between the coagulating liquid and the filaments, the container 7 may be of small cross-sectional area.  As shown in Fig. 6, the nozzle 6 is fixed to a flexible pipe 41 fixed at its bottom end in a tubular shaft 43 mounted in anti-friction bearings.  The bottom of pipe 41 tapers and fits in a conical bore of shaft 43.  Viscose is supplied through a bore in the spring-pressed step bearing 45. The shaft 43 is rotated by a motor 47.  Coagulating liquid passes from pipe 56 tangentially into an annular chamber 53 and then through passages 52 into the space 50 between pipes 40, 41. It then passes into the cup 48 and conical container 49.  Ribs may be provided on the outer wall of pipe 41 or inner wall of pipe 40. The passages 52 and their walls may be constructed so as to form blades which are edge-shaped at the intake and delivery ends.  If desired the rear walls of the passages 52 may be curved while the front walls are plane and tangential to the passage 50.  The flexible pipe 41 sets itself with its centre of gravity in the axis of rotation.  As shown in Fig. 9, pipe 41 is rigid and fixed with its conical end 66 into a ball 67 held in a spherical socket provided at the bottom of shaft 43 by a cap 68.  At the bottom end the pipe carries a block 69 with a spherical bottom face having its centre at the centre of the ball 67 and bearing on the step bearing 45.  In another modified construction, the pipe 41 is flexible and is guided within the tubular shaft 43 at two points, the shaft having balls fixed to it and guided in cylindrical bearing surfaces.  The pipe 41 can thus set itself with its centre of gravity in the axis of rotation.