Patent GB-498358-A (GB)
Title: Apparatus for manufacturing artificial silk
IPC: D01D5/18
Filed: 1938-01-12
Abstract: <PICT:0498358/IV/1> <PICT:0498358/IV/2> Apparatus for spinning artificial silk comprises a rotary nozzle and a rotary container for the coagulant, the lower end of the container being open and immersed in a bath of coagulant and the top end of the container being provided with a suction device by means of which the coagulant is drawn upwardly through the container.  The suction may be produced for example by a suction apparatus disposed separately of the spinning apparatus as shown in Fig. 20, or by constructing the upper part of the container in the form of a centrifugal pump as shown in Fig. 1, in which apparatus the thread is spun upwardly and in Figs. 2, 10 in which apparatus the thread is spun downwardly.  Any bubbles of air or gas in the container may be removed by providing the container and the nozzles with inclined or bevelled guiding faces directing the bubbles towards the delivery passages and by the provision of ejectors as described below.  The apparatus shown in Fig. 1 comprises a rotary pipe 1 carrying a spinning nozzle 2 and having a container 7 for the coagulant mounted thereon.  The lower part of the container 7 opens into a pipe 4 the lower end of which is immersed in a bath 3 of coagulant and the upper part of the container is provided with delivery openings 11 for the coagulant which acts as a centrifugal pump.  The container 7 is provided with a conical lid 9 whereby any bubbles of air or gas are directed to the openings 11. In the apparatus shown in Fig. 2, a spinning nozzle 13, which is rotated by a motor 17 and is fed with spinning solution by a pipe 25, is located near the top of the container 16 for the coagulant.  The lower open end of the container is immersed in a bath 31 of coagulant and the upper end is provided with bores 26 acting as a centrifugal pump.  The coagulant ejected from the bores 26 is collected in a receptacle 29 and thence discharged through a gutter 30.  The container 16 may be surrounded by a jacket 27 provided with <PICT:0498358/IV/3> <PICT:0498358/IV/4> <PICT:0498358/IV/5> <PICT:0498358/IV/6> ribs 28 to prevent transmission of the rotary movement of the container to the coagulating bath.  The spinning apparatus may be raised or lowered relative to the coagulating bath, for example for starting the spinning operation, by means of a chain 24 and in addition mechanism may be provided so that the spinning apparatus may be turned laterally to bring the bottom of the spinning apparatus near the surface of the bath.  The threads delivered from the container 16 are guided over guide pins 38, 39, mounted on an adjustable supporting member 41.  Any air or gas bubbles may be removed from the container by means of ejectors which may supplement or even replace the bores 26 acting as a centrifugal pump; each ejector may comprise two nozzles 60, 61, Fig. 10, the suction chamber of the nozzle 60 being connected by passages with the top end of the container.  The collection of air or gas bubbles on the nozzles 50 is avoided by forming the nozzles with tapering walls 54, 55 as shown in Fig. 10, or by axially securing a conical member 72 thereto as shown in Fig. 15.  The bores 48a, Fig. 13, of the spinning nozzle may be inclined inwardly and downwardly in accordance with the tendency of the filaments to direct themselves inwardly by centrifugal action. In the apparatus shown in Fig. 20, the coagulant is drawn upwardly through a container 98 secured to a rotary nozzle 95 by means of a suction pump 99.  Specification 484,605 is referred to.