GB736636A - Improvements in or relating to the spinning of viscose - Google Patents

Abstract

<PICT:0736636/IV (a)/1> Apparatus for the manufacture of artificial filaments, particularly regenerated cellulose filaments from viscose, comprises a container for a spinning bath, a spinning jet in the container and below the working level of the surface of the bath, means for feeding spinning solution to the jet, a tubular conduit in line with the jet and having one end wholly below the working level of the surface of the bath and the other wholly above it, the interior of the conduit being in communication with the bath, and means for drawing filaments from the jet through the conduit, the arrangement being such that, in operation, coagulating liquid is drawn through the conduit solely by the drag of the filaments. Preferably, the conduit opens into the bath near the point of extrusion. The height of the open end of the conduit above the working level of the surface of the bath is preferably less than 6 inches and may be even less than 2 inches. At its lower end the conduit may be of enlarged diameter and may be conical in shape at that end. Preferably it is arranged so as to encircle the jet face so that the coagulating liquid enters the conduit behind the plane of the jet face. The preferred diameter of the conduit is within 40 per cent of that at which the maximum rate of flow of liquid through the conduit occurs under the other conditions prevailing. The bulk of the coagulating liquid travelling with the moving filaments may be removed at a level below that at which it would fall away under gravity alone. For this purpose, a fixed or moving member, e.g. a free-running or positively driven roll, may be positioned so as to contact the filaments above the open upper end of the conduit, or the conduit or an extension thereof may be provided with openings in its side above the level of the spinning bath, through which coagulating liquid can be discharged back into the bath. If desired, the filaments may be drawn through the conduit under such tension that they undergo a considerable degree of stretch. As shown, a spinning assembly 13 comprising conduit 14, spinning-head 15 and jet 17 is situated in a tank 11 containing a spinning bath 12. The filaments 18 pass upwardly through conduit 19 which has a conical lower end 21 encircling the face of the jet. The conduit is slidably mounted in a mount 23 carried by bracket 24. After leaving conduit 19, the filaments 18 pass over idler roller 25 which is at such a position that the filaments reach it before the major portion of the liquid carried up with them would fall away under gravity alone. The filaments pass under a second idler roller 29 and then up to a godet wheel 32. They pass round the godet and the skewed roller 33, and are then taken up on bobbin 34. To obtain access to the spinning nozzle, roller 25 may be lifted with its dovetailed mounting 27 out of the support 28, and the conduit 19 may be raised until one of its projections 36 rests on ledge 37.