Patent GB-996415-A (GB)
Title: Spinneret assembly for spinning composite filaments
IPC: D01D5/32
Filed: 1964-01-28
Abstract: 996,415. Spinneret assembly for spinning composite filaments. MONSANTO CO. Jan. 28, 1964 [Jan. 28, 1963], No. 3687/64. Heading B5B. A spinneret assembly for spinning composite filaments consisting of two different components bonded together in " eccentric " (i.e. side-byside) relationship is shown in its fully assembled, operative condition in Fig. 1, wherein a feeder block 12 and a spinneret plate 14 are held in face-to-face, intermeshing engagement by means of a retainer nut 16. The spinneret plate 14 rests upon an interior annularly-shaped shoulder 18 of the nut 16. The feeder block 12, shown in Figs. 2-5, comprises a cylindrical integral body portion 20 provided with an externally-threaded portion 22 for engagement with the internal threading 24 of the retainer nut 16. The bottom surface of feeder block 12 is provided with distribution channels 26A, 26B of V-shaped cross-section shown in elevation in Fig. 3 and in plan in Fig. 5. The crosssection of the channels may be other than V- shaped, provided that the channels can mesh with similar channels formed in the upper surface of the spinneret plate. Intermediate the extremities of these distribution channels and centered with respect thereto, there are formed distribution slots 28A and 28B, shown in elevation in Fig. 4 and in plan in Fig. 5. Separate liquid spinning media A and B are conveyed through main supply passages 32A, 32B from the upper exterior surface of feeder block 12 (Figs. 3 and 4) and transversely extending distribution passages 38A, 38B the ends 40A and 40B of which are closed by threaded plugs 42A, 42B. Along the entire lengths of passages 38A, 38B and extending vertically downward therefrom are provided pairs of feeder passages 44A, 44B, which provide communication of the separate liquid media A and B between distribution passages 38A, 38B and distribution slots 28A, 28B. The feeder passages 44A, 44B are staggered with respect to one another to feed the separate liquid media A and B to the alternate distribution channels 26A, 26B respectively. As shown in Figs. 3, 6 and 7, the upper face of the spinneret plate 14 is provided with feeder channels 46A, 46B shaped to receive in closely fitting fashion the outer extremities of protruding ridge portions 48 on feeder block 12. The spinneret orifices 50 (Figs. 3 and 7), communicate through orifice passages 52 with feeder channels 46A, 46B At the junction of passages 52 with feeder. channels 46A, 46B, there are provided inverted cone-shaped merging chambers 54 which cooperates with the protruding rib portions 48 to define chambers of such shape as will ensure a gradual and laminar merging of the separate spinning media A and B introduced from either side of the protruding rib portions 48. As shown in Fig. 7, upon bringing the channelled surface of spinneret plate 14 into engagement with the channelled surface of feeder block 12, the ridge portions 48 will fully occupy feeder channels 46A, 46B and, because of the somewhat greater depth of the distribution channels 26A, 26B there will be defined manifold passages 56A, 56B which are bounded by the trough portions of channels 26A, 26B and the flattened portions 58 between the feeder channels 46A, 46B of spinneret plate 14. At spaced points along the length of each feeder channel 46 there occur the merging chambers 54 providing communication between manifold passages 56 and orifice passages 52. Flow from passages 56 to passages 52 is otherwise prevented by the intermeshing engagement of rib portions 48 with feeder channels 46.