Patent GB-486561-A (GB)
Title: Improvements in or relating to methods of and apparatus for manufacturing artificialthread or the like
IPC: D01D10/04
Filed: 1936-12-10
Abstract: <PICT:0486561/IV/1> <PICT:0486561/IV/2> <PICT:0486561/IV/3> <PICT:0486561/IV/4> Apparatus for the manufacture of artificial filaments or like materials by the dry spinning process comprises one or more devices, situated within the spinning cell, on which the filaments are positively advanced in a large number of helical turns. The apparatus may be used for the production of bands, tapes, ribbons, threads, and staple fibre, from solutions in volatile solvents of cellulose acetate, cellulose nitrate, or cellulose ethers.  The spinning cell is defined as the combination of spinning nozzle, evaporative chamber, and any other chamber or chambers in which the thread is treated until it is substantially dry.  The evaporative chamber is the compartment through which the thread passes from the spinning nozzle to the first support, i.e. a thread advancing reel.  The first reel may be placed at a short distance from the spinning nozzle, and evaporation of solvent may be continued as the thread travels round and along the reel.  As shown in Fig. 1, multiple filament thread 1 passes through the evaporative chamber 3, through a partition 39 into compartment 38 around reel 11 in helical turns, and then to cap twister 52.  The reel may be constructed as described in Specification 413,414, [Group IX].  Evaporation of solvent is completed as the thread passes round reel 11.  The reel is perforated and is provided with a hollow shaft through which evaporative medium may be passed. Conditions of evaporation in chambers 3 and 38 may be different and may be adjusted so as to modify the lustre of the thread.  As shown in Fig. 6, two thread advancing reels 74, 75 are situated in the evaporative chamber 3.  As shown in Fig. 8, the thread 1 passes through the evaporative chamber 3, and then in succession round reels 87, 88, 89 in helical turns. The reels are arranged in separate compartments 94, 95, 96 to which evaporative medium may be supplied through the hollow shafts of the reels.  As shown in Fig. 10, a longer evaporative chamber is used, and the thread passes round a reel 105 in a compartment 113.  The thread is treated with liquid from a distributer 107.  It then passes out of the spinning cell and round a reel 106 upon which it is dried while travelling in helical turns.  Heated air is supplied to the housing 117.  The thread is then passed to a cap twister. Corresponding reels of adjacent spinning machines may have their driving ends adjacent and may be driven from the same source.  The thread may be stretched or shrunk by passing it round reels rotating at different diameters which increase or decrease in the direction of travel of the thread.  The skin-like outer surface which first forms on the thread immediately after extrusion may be softened by application of liquid or gaseous solvents before or during stretching of the thread.  The lustre of cellulose derivative threads may be reduced by application of steam, water, benzene, gasoline, or alcohols.  The lustre may be increased by application of xylene. Fugitive dyes may be applied to the thread as it is passing round one of the reels.