Improvements to the processes and devices for the manufacture of the filaments or artificial yarns

摘要

300,998. British Celanese, Ltd., Kinsella, E., Bower, J., Taylor, W. I., and Dreyfus, H. May 23, 1927. Apparatus for making filaments.-When dryspinning artificial silk, &c., particularly by the downward spinning method, the full evaporative effect of the air or other gaseous medium is obtained by providing the spinning cell or chamber with collector devices of such a construction that either the whole of the evaporative medium, or a part of such medium, is constrained to pass within the immediate vicinity of the spinning nozzle and preferably to impinge on the nozzle face. The collector device may be formed by tapering the spinning cell towards the spinning nozzle; or it may consist of a plate having a hole or holes corresponding with the spinning nozzle or nozzles, and mounted at a slightly lower level in the cell; or it may consist of a hood or inverted funnel or bell-shaped member 1, Fig. 1, mounted below the spinning nozzle 3 and supported, e.g., by means of flexible wires suspended from pullies ; or a funnel-shaped member 11, Fig. 4, mav be employed, the member being capable of sliding on the pipe 13 leading to the nozzle 14 and being fixed in position by a spring clip 17 ; in this last construction, a branch pipe 15 connected to the upper part of the member, which may be of spherical shape, serves for the withdrawal of the evaporative medium; another alternative form of collector comprises a cylindrical member 18, Fig. 5, mounted on the supply pipe 20 and carrying the outlet for the evaporative medium, and a second cylindrical member 19 capable of telescoping on the first member, the evaporative medium entering through the restricted mouth 25 of the latter or through a perforated plate fitted in the mouth, even distribution of the medium being assisted by a perforated flange 27 above the nozzle; or a heating device 40, Fig. 7 may be combined with the collector 37, in which case the part 42 carrying the outlet pipe 43 is a sliding fit in a flange 41 formed on the collector and is held on the supply pipe 45 by a clip 44. As an alternative to the means above described, the means for withdrawing the evaporative medium may comprise one or more downwardly extending tubular members, preferably situated immediately above the nozzle or nozzles, one for each; alternatively, the withdrawal means may comprise a pipe of annular form surrounding the nozzle and provided with perforations, slits, or continuous slits, this arrangement being particularly applicable to the ring type of nozzle although it may be used with the disc type, as shown in Fig. 8 in which the perforated ring-shaped pipe 52 is mounted immediately above the nozzle 49, the collector comprising in this case an inverted funnel-shaped member 51, in which a tubular part 50 is slidably mounted ; and the branches for carrying off the evaporative medium from the several cells or nozzles are preferably provided with valves, constrictions or other regulating devices, with or without flow meters as described in Specification 203,092. By the use of the collector devices, a stricter control is obtained over the cross-section of the filaments, which by suitable adjustment may be of flat, semi-flat, or rounded section. Specifications 165,519 and 198,023 also are referred to.