Patent GB-695571-A (GB)
Title: Improvements relating to the treatment of travelling filaments with fluids
IPC: D01D5/04
Filed: 1950-09-25
Abstract: <PICT:0695571/IV (a)/1> Apparatus for separating a travelling filament from a fluid employed in the treatment thereof comprises a hollow member having a tapered end section, an exit for the filament in that section, and a vent for the exit of the fluid connected to that section by a passageway smaller in cross-section than the narrow end of the tapered section and smaller than the vent.  The apparatus is particularly applicable to the production of artificial filaments by a dryspinning operation, but it may also be used generally in the treatment of filamentary material, including yarns, wires, rods and tubing, with fluids.  As shown, the lower portion of a spinning cell 1 adjoins the assembly 2 which includes the outlet for the filaments and an outlet for evaporative medium.  The spinning cell, which may be heated, is provided with means for passing air or other evaporative medium therethrough to remove volatile solvent from the freshly-formed filaments.  The thread of filaments 6 passes downwardly through the spinning cell and aspiration device 2, the evaporative medium preferably also passing co-currently with the thread through both cell 1 and device 2.  The thread is withdrawn through aperture 7, a guide 9 being provided.  By means of a throat insert 11 below the tapered portion 12 and in the vent 18 of the aspiration take-off, a suction effect supplementary to that applied by the solvent recovery system is achieved, since the cross-sectional area through which the flowing evaporative medium passes is diminished and the velocity of the medium across the filaments just prior to their exit from the cell enclosure is increased.  This supplementary suction effect may be varied by inserting throat inserts 11 of different sizes.  If desired, the restriction in the vent 18 may be attained by shaping the vent, as by indentations. Inserts of other shapes may be used, e.g. a bar attached to door 8. The evaporative medium is led into the cell enclosure through one or more openings at the upper part of the cell and is withdrawn through screen 13 and then via conduit 14 to the solvent recovery apparatus. Trap door 15 is hinged at 16 and is normally kept shut by spring 17. It may readily be opened to permit cleaning of the screen 13 and vent 18 without interrupting the spinning operation.ALSO:<PICT:0695571/IV (c)/1> Apparatus for separating a travelling filamentary material such as a yarn from a fluid, e.g. a gas, employed in the treatment thereof, comprises a hollow member having a tapered end section, an exit for the filament in that section, and a vent for the exit of fluid connected to that section by a passageway smaller in cross-section than the narrow end of the tapered section and smaller than the vent.  As shown, the lower end of the treatment cell 1 adjoins the assembly 2 which includes the outlet for the filament and an outlet for the treating gas.  The filament 6 passes downwardly through the cell and device 2 and is withdrawn through aperture 7. By means of a throat insert 11, situated below the tapered portion 12 and in the vent 18, a suction effect supplementary to that applied by the fluid recovery system is achieved, since the cross-sectional area through which the flowing treating fluid passes is diminished and the velocity of the medium across the filament just prior to the exit is increased.  This effect may be varied by using throat inserts 11 of different sizes.  If desired the restriction in vent 18 may be attained by appropriate construction of the vent, as by indenation. Inserts of other shapes may be used, e.g. a bar attached to door 8. A spring-closed trap-door 15 may be opened to permit cleaning of screen 13 and vent 18 without interrupting the continuous travel of the filament.