Patent GB-1171600-A (GB)
Title: Spinning Head for the Manufacture of Synthetic Filaments from Two Differently Composed Spinning Liquids
IPC: B29C48/05
Filed: 1968-08-23
Abstract: 1,171,600. Spinneret. J. P. BEMBERG A.G. 23 Aug., 1968 [25 Aug., 1967], No. 40443/68. Heading B5B. In a spinning head having a distributer system for the manufacture of synthetic filaments from two differently composed spinning liquids, the first spinning liquid enters chamber 21. As the cone 93 (Figs. 3 and 4) is formed in the peripheral direction with alternating external slots 91 and internal slots 92, the external slots 91 being connected with chamber 21, only the first spinning liquid is able to flow through them. It then passes, successively, the rows of apertures or slots 81 of packing 8 (which is of identical shape to the pressure compensation plate 3 shown in Fig. 5 and lies immediately above it) located externally of the outer slot 91, the rows of apertures 31, the rows of apertures or slots 81 of the packing 8 lying below plate 3, and the slots 41 of the slotted plate 4 (Fig. 6). The second spinning liquid enters chamber 19, and flows into tube 94, the inner space of which is connected with the inner slots 92 in the conical insert 9, so that the second liquid passes successively through the rows of apertures or slots 82 located below the inner slots 92, the rows of apertures 32, the rows of apertures or slots 82 and the slots 42. Spinneret plate 5 has the same number of rows of apertures 51, 52 as in the preceding plates, but relatively thereto they are offset through half a pitch angle, so that the knife edges 43 halve the aperture cross-sections of the rows of apertures 51, 52. Below the knife edges 43 of the plate 4 the two spinning liquids supplied separately from the slots 41 and 42 combine, are extruded side-by-side, together through the spinning orifices of spinneret plate 5 and form composite filaments the components of which have substantially uniform proportions in the cross-section of the filaments. A number of modifications are described. Thus, Fig. 2 (not reproduced) shows a modified spinning head capable of withstanding higher spinning pressures and the packing 8 may be omitted, the associated faces of the members 9, 3, 4 being ground so that they are self-sealing; and the pressure compensation plate 3 may be dispensed with, or its apertures may be replaced by slots. Where filaments are desired having component proportions differing from 50: 50, e.g. 30 : 70 the slotted plate 4 or the spinneret plate 5 is varied. Thus the rows of apertures 51, 52 in the spinneret plate may be arranged not radially but secantwise; analogously, the spinneret plates 5 may be retained and the knife edges 43 of plate 4 correspondingly varied, the spinning liquids in either case being fed at different velocities but so that their outflow velocities are equal. Apertures 51, 52 may be arranged as secants so that they do not coincide with knife edges 43 but their projections interseat on the spinneret plate; in this way there may be spun simultaneously, using one spinning head, filaments containing only any one component, or both components, so that mixture effects are obtained using two differently coloured spinning liquids. An effect yarn may be spun by adjusting the spinneret plate 5 so that the radial rows of apertures 51, 52 are offset by an extremely small centring angle relatively to the knife edges 43, so that the filaments spun have varying component proportions depending on their distance from the centre; thus, where differently coloured spinning liquids are used, mixture effects are obtained.