GB1030005A - Spinning composite fibres - Google Patents

Abstract

1,030,005. Spinning solution distribution assembly. AMERICAN CYANAMID CO. Sept. 3, 1963 [Jan. 3, 1963], No. 34781/63. Heading B5B. A spinning solution distribution assembly for use with a spinneret having a number of orifices and adapted for spinning composite filaments comprises a distribution assembly 11, illustrated in Fig. 1 (not shown), in the form of a stack of plates having a generally flat, though recessed, surface shown facing uppermost in Fig. 1. This stack consists of a number of plates secured together between a pair of end plates 13, 14 by means of three bolts 15. Spinning solution (hereinafter termed " spin dope ") enters the assembly 11 through the four orifices 17, 18, 17, 18 which are not provided in end plate 14. Each of the plates of the stack 11 is provided with three holes 20, illustrated in Fig. 2 (not shown), through which pass the bolts 15. Additionally, each plate is provided with orifices 17, 18, 17, 18 which, when the plates are assembled in the form of a stack, line up with the corresponding openings in end plate 13 to form four spin dope passageways leading through the stack from end plate 13 to the last plate prior to end plate 14. The first plate 22 adjacent to end plate 13 is cut away at 23, 23 to provide channels leading from the orifices, 18, 18 to the upper surface of the assembly 11. The third plate 25 from the end plate 13 is cut away at 26, 26 to provide channels leading from the orifices 17, 17 to the upper surface of the assembly 11. Plate 25 is preferably a mirror image of plate 22 and may be manufactured as a plate identical with plate 22 but inserted in the stack the other way round. Between plates 22 and 25 there is interposed a third plate 28 which serves to separate the cut-away portions 23 from the cutaway portions 26 except for a region adjacent to the surface of distribution assembly 11 whose recesses 29 are provided. After plate 25 there is provided a fourth plate 31 which has neither V shaped cut-away portions nor recesses and serves to isolate plates 22, 28 and 25 from the other similar groups of three plates which follow until the end plate 14 is reached. A spinneret assembly 33 comprises a housing 34 supported in a conventional pivot block (not shown) by pivot rod 35 and a spinneret 37 having a number of rows of orifices and which is removably secured to the assembly by means of a clamp 38, as illustrated in Figs. 3 and 4 (not shown), which includes a retainer 39 pressing spinneret 37 against housing 34 by means of screw 40. Within housing 34, illustrated in Figs. 4 and 5 (not shown), assembly 11 is positioned within a recess and pressed into place by means of screw 42. Passageways 17, 18, 17, 18 in the assembly are then in register with passageways 45, 46, 45 and 46 (Figs. 1 and 5) in the housing 34. Accurate alignment of the assembly 11 with spinneret 37 is ensured by means of pins (not shown) received in holes 50 in end plates 13 and 14 of the assembly which mate with corresponding holes in spinneret 37. In operation, a first spin dope passes through the assembly 33 via passageways 46, passageways 18, channels 23, recesses 29, and corresponding orifices in spinneret 37 into the coagulating medium, and a second spin dope passes through the assembly 33 via passageways 17, channels 26, recesses 29, and the same orifices in spinneret 37. When it is desired to produce a bi-component filament consisting of a pair of dissimilar materials in a side-by-side relation extending along the length of the filament, the two spin dopes are fed simultaneously to the respective dope pathways. When it is desired to produce a bi-component filament consisting of alternating segments of two different materials along its length, the first and second spin dopes are fed alternately to the assembly 33.