Patent GB-734850-A (GB)
Title: Improvements relating to apparatus for the continuous after-treatment of wet-spun synthetic fibers
IPC: D01D10/04
Filed: 1952-04-29
Abstract: Apparatus for the continuous after-treatment of wet-spun synthetic fibres comprises a pair of driven liquid-treating rolls, means for stretching the liquid-treated fibre, and a pair of driven drying rolls, both pairs of rolls converging at the take-off end, the angle of convergence of the liquid-treating rolls being greater than the angle of convergence of the drying rolls, and both sets of rolls being driven at the same peripheral speeds.  As shown, a water-coagulable solution of a polymer containing acrylonitrile is extruded from a nozzle 14 into an aqueous bath 16, and the thread 11 is guided over a roller 18 on to the divergent end of a pair of converging rolls 19 upon which it is treated <PICT:0734850/IV (c)/1> with an aqueous liquid issuing from a nozzle 24.  Excess liquid is collected in a drip tray 25 and may be returned to the bath 16 or recovered through a pipe 26.  The thread is then led several times round each of two godets 28 and 31, between which it is stretched in a hot-water trough 30 and from which it passes to the divergent end of a pair of drying rolls 36, which converge at a slightly smaller angle than the rolls 19.  At the feed-on end of the drying rolls an antistatic agent may be applied to the thread from a nozzle 41, a drip tray 42 being provided to recover the excess. From the rolls 36 the thread passes through a hardening furnace 45 and over a godet 46 rotating at a lower peripheral speed than that of the rolls 36 so as to allow a predetermined amount of relaxation in the thread.  A weighted pinch roll 49 prevents slippage upon the roll 46.  The hardened thread is packaged upon a ring twisting device 56.  The rollers in each pair of rolls 19 and 36 may be driven by a common means or, as shown, through separate mechanisms 22, 23 and 39, 40 respectively.  The rolls in each pair are driven at the same speed. The godet 28 is driven at the same speed as the rolls 19. Specification 672,775, [Group IV (a)], is referred to.ALSO:<PICT:0734850/IV (a)/1> Apparatus for the continuous after-treatment of wet-spun synthetic fibres comprises a pair of driven liquid-treating rolls, means for stretching the liquid-treated fibre, and a pair of driven drying rolls, both pairs of rolls converging at the take-off end, the angle of convergence of the liquid-treating rolls being greater than the angle of convergence of the drying rolls, and both sets of rolls being driven at the same peripheral speed.  As shown, a water-coagulable solution of a polymer containing acrylonitrile is extruded from a nozzle 14 into an aqueous bath 16, and the thread 11 is guided over a roller 18 on to the divergent end of a pair of converging rolls 19 upon which it is treated with an aqueous liquid issuing from a nozzle 24.  Excess liquid is collected in a drip tray 25 and may be returned to the bath 16 or recovered through a pipe 26.  The thread is then led several times round each of two godets 28 and 31, between which it is stretched in a hot water trough 30 and from which it passes to the divergent end of a pair of drying rolls 36, which converge at a slightly smaller angle than the rolls 19.  At the feed-on end of the drying rolls an antistatic agent may be applied to the thread from a nozzle 41, a drip tray 42 being provided to recover the excess.  From the rolls 36 the thread passes through a hardening furnace 45 and over a godet 46 rotating at a lower peripheral speed than that of the rolls 36 so as to allow a predetermined amount of relaxation in the thread.  A weighted pinch roll 49 prevents slippage upon the roll 46. The hardened thread is packaged upon a ring twisting device 56.  The rollers in each pair of rolls 19 and 36 may be driven by a common means or, as shown, through separate mechanisms 22, 23 and 39, 40 respectively.  The rolls in each pair are driven at the same speed. The godet 28 is driven at the same speed as the rolls 19. Specification 672,775 is referred to.