GB326232A - Improvements in or relating to processes and apparatus for the production of artificial filaments or threads - Google Patents

Abstract

326,232. British Celanese, Ltd., Dreyfus, H., Kinsella, E., Bower, J., and Taylor, W. I. Dec. 7, 1928. Addition to 300,998 and 304,674. Apparatus for making filaments. - The process and apparatus of the parent Specifications are modified by providing in conjunction with a spinning nozzle comprising a. line of extrusion orifices, a collector device or devices having a shape appropriate to the shape of the nozzle and adapted to limit the passage for the evaporative medium so that substantially the whole or a definite proportion is constrained to pass through the immediate vicinity of the spinning orifices. Collector devices according to the invention may be used with nozzles having a rectilinear, arcuate, or other curvilinear arrangement of orifices, or with nozzles comprising two or more lines of orifices forming an enclosed or partially enclosed figure. The collector devices may be hoods, funnels, cylinders, shields, or perforated plates, and may be directly connected to the exhaust for the evaporative medium. In Figs. 1 and 2, two line nozzles are employed. The collector device comprises an apertured plate 17 and a pair of movable plates 18 which leave apertures 19 through which the filaments pass, and the evaporative medium is constrained to pass through the immediate vicinity of the nozzles 16 on its way to the drawoff device 21. In Fig. 3, collector devices are shown for employment with arcuate line nozzles, an apertured plate 22 co-operating with movable plates 23 to leave apertures 24. In Fig. 7, a ring nozzle 37 is employed in a cell 38. A collector device comprising a plate 40 having an aperture conforming with the shape of the ring 37, is secured in the cell at about the level of the ring 37, leaving a gap 41. The interior of the ring may be closed by a plate 42 or a cone 43, or an annular gap may be left. In Fig. 9 a ring nozzle 46, with collector device 47 or 48, is provided with a hood-like collector device 49 downwardly extending from the filter chamber 50 and connected by a. pipe 51 to the exhaust for the evaporative medium. Instead of the whole of the evaporative medium being taken through hood 49 and pipe 51, a portion may be allowed to pass outside the hood 49 and through exhaust device 53. In Fig. 10 a funnel-shaped collector device 54 of cross-section corresponding to the shape of the line nozzle 55 is supported by a perforated plate 56, and its position is preferably adjustable. There is also provided a draw-off device comprising a pipe 58 perforated or slotted on its under surface as shown at 59 and shaped to correspond with the form of the nozzle. The collector device 54 may be heated electrically or be provided with an air, steam or hot-water jacket. The collector devices described above may be used in cells open or closed at the end remote from the spinning nozzle, and containing a small or large number of line nozzles. Specifications 165,519, 198,023, and 203,092 are referred to.