Patent GB-562271-A (GB)
Title: Improvements in and relating to the manufacture of artificial silk
IPC: D01D7/02
Filed: 1942-11-06
Abstract: <PICT:0562271/IV/1> <PICT:0562271/IV/2> In apparatus for the manufacture of artificial filaments, comprising a centrifugal pot and means for draining liquid solutions or suspensions from the immediate surroundings of the pot into a common drainage channel leading to a discharge system, means are provided for intermittently spraying the exterior of the pot with liquid during operation, and means are provided for automatically diverting the effluent from the drainage channel during spraying to a separate discharge system.  Diversion of the effluent may begin simultaneously with the beginning of spraying or at such a time after that the volume of effluent at the point of diversion is substantially increased by the spray but has not reached a maximum.  The intermittent spraying means may be electrically operated.  Operation of the means for diverting the effluent may be controlled by the volume of the effluent from the drainage channel. In the collection of freshly-spun artificial filaments, e.g. filaments obtained from viscose, there is a tendency for salts to deposit on the exterior of the spinning pots.  The liquid spray removes or prevents the formation of such deposits.  The liquid used for spraying may be water or dilute sulphuric acid.  As shown in Fig. 2, each spinning pot chamber 3 is provided with an opening in which operates the funnel 6 for guiding the filaments into the centrifugal pot 2.  A drainage opening leads to a drainage channel 10 which extends between two rows of spinning pots.  An outlet 11 is connected to pipe 12. Each chamber 3 is provided with a spray nozzle 13 which directs a spray vertically along the outer surface of the rotating pot.  The liquid-supply pipe 16 is provided with a solenoid-, motor-, or thrustor-operated valve 17 whose action is controlled by a relay 18 which in turn is controlled by a time switch 19.  A second relay 20 is associated with switch 19 for operating solenoid 21, thereby drawing core 22 upward and tilting the trough 23.  The trough is open at both ends and supported by trunnions 25 above the separator box 26 which is partitioned into chambers 27, 28, each provided with separate discharge pipes.  A master switch 33 connects the relays 18, 20, and time-switch 19 to a source of electric power 34.  The time-switch may be of a type which regularly closes a circuit at repeated intervals for definite times, or of a type which closes several circuits at set intervals with a predetermined delay between the closing of one circuit and that of the next.  It may comprise a pair of brushes contacting with the periphery of a disc composed of insulating material except for a short segment of conducting material.  Operation of the switch may thus cause intermittent and simultaneous operation of the valve 17 and the solenoid core 22.  The time-switch may be designed to delay operation of relay 20 so that tipping of trough 23 will not occur until the volume of liquid pouring from pipe 12 is substantially increased.  This may be effected by providing the switch with two discs, the conductive segments of which are offset.  A simpler form of apparatus is shown in Fig. 3.  Trough 35 is mounted so that it normally tilts to the left when there is no discharge, and the opening of pipe 12 is placed to the left of the pivot so that the small volume of normal flow of liquid will pass into the trough on the left of the pivot.  A larger flow from pipe 12 as a result of the operation of the sprays causes the discharge stream to strike the trough 35 sufficiently to the right of the pivot and with sufficient impact to tilt the trough to the right and divert the solution into the compartment 37 on the right of the separator box.  The trough 35 tilts back to the left when the flow of liquid is reduced.