Patent GB-453250-A (GB)
Title: Improvements in or relating to a method of and apparatus for the production of artificial silk
IPC: D01D7/02
Filed: 1935-10-21
Abstract: In a method of production of artificial silk by reeling in centrifuges by means of machines in which the centrifuges after the production of the spun cake are moved into another position where the spun cakes are subjected to further treatment, the reeling of the spun cakes is effected at one spinning position in several centrifuges in succession, said centrifuges forming a set, while at the same time, the cakes which have already been reeled in a similar set <PICT:0453250/IV/1> <PICT:0453250/IV/2> <PICT:0453250/IV/3> of centrifuges are being after-treated with liquids in another part of the machine, the number and dimensions of the centrifuges forming a set being such that one set can be filled with spun cakes while an after-treatment with liquids is being carried out in all the centrifuges of another set.  The sets of centrifuges can be arranged radially on a frame rotatable about an axis perpendicular to the axes of the centrifuges or the set of centrifuges can be arranged on a rotatable frame on parallel axes. The spinning nozzle 1 is arranged in a casing 2 to which an acid bath is supplied by a pipe 3, the free surface of the bath being above the nozzle.  The filaments pass through the small holes in the plate 5 and are directed together with the acid to the tube 6. This tube passes through a box 7, Fig. 2, comprising three chambers 8, 9, 10, the enclosed portion of the tube being perforated and constricted at those places which are level with the inner partitions of the box 7.  Most of the acid flows from the compartment 8 by the tube 11, but some of the acid penetrates together with the filaments to the portion of the tube in the chamber 9, from which it is blown by an air blast from a perforated pipe 12 and flows away down pipe 13.  The filaments are mixed by means of water flowing from the upper compartment of a similar lower box 15 to the compartment 10 of box 7.  The tube 6 is surrounded on two sides by rubber sectors and when said tube is turned through 90 DEG  flow of liquids through the openings in the tube is interrupted.  An air blast in the lower compartment of box 15 separates superfluous water from the filaments which pass on to a slidably arranged tube 23 which enters the casing 22 housing a frame 24 rotatable on its axis 43 and carrying rotatable discs 25. Each disc has two centrifuges 26 arranged on hollow shafts passing through the disc to a coupling disc 27, which may be driven by means of a slidable coupling disc 28 from the hollow shaft of an electro-motor 29.  The hollow shaft of the motor enters the suction tube 30, so that after thread breakage, winding may be restarted by depressing the tube 23 to the bottom of the centrifuge to connect with the hollow shaft thereof.  When one centrifuge 26 of a set is filled, the disc 25 is turned through 180 DEG  C. and the other is filled.  When both are filled the frame 24 rotates through an angle of 45 DEG  and the next set is filled. The next rotation of 45 DEG  brings the first set of centrifuges to the after-treatment device comprising a box 33, perforate tubes 34, Fig. 6, for introducing chemicals supplied by tubes 44 into the perforate cylinders 31 of the centrifuges, and tubes 35 for evacuating the space between the wall of the cylinder 31 and the outer wall of the centrifuge.  The box 33 slides to meet the centrifuges when they reach the horizontal position and closes them with rubber packing rings 36.  The tubes 34 have rubber packing plugs 37 for closing the hollow shafts of the centrifuges. The next rotation through 45 DEG brings the centrifuges into a drying position, and in the next one they are centrifuged to remove the final traces of water.  The casing 22 has inlet tubes 40 and exit tubes 41 for air which aids the drying operations.  After drying of the artificial silk the walls of the cylinder 31 are automatically drawn apart and the windings fall on to transporting means 42.  Symmetrically arranged in relation to box 33 in another box 33a which may be used for after-treating windings formed in a similar machine to the one just described.  A number of these machines may be arranged parallel and side by side on the same driving shaft, and a number of these groups of machines may be arranged together, the operations of one group being retarded in relation to those of the next group, so that the various liquids employed for after-treatment may pass from one group of machines to the next.