Patent GB-326462-A (GB)
Title: Improvements in or relating to the production of artificial filaments and threads
IPC: D01D5/04
Filed: 1928-09-28
Abstract: 326,462. British Celanese, Ltd., and Taylor, W. I. Sept. 28, 1928. Yarns and threads.-For the production of artificial filaments of large cross-section, a number of artificial filaments either alone or mixed with other yarns or metallic wires or tapes, are treated with such limited quantities of solvent or softening agents that the artificial filaments are rendered sticky or tacky, and then the bundle of filaments are caused to adhere together. The filaments to be united may be associated prior to the application of the solvent, or the latter may be applied to the filaments individually. The solvent may be applied by means of wicks, rollers, rods or other bodies moistened therewith; or as a spray, or in the form of vapour. The united filaments may be allowed to harden, or the solvent may be removed by washing; alternatively, it mav be allowed to remain in the filaments until the latter have been formed into fabrics &c., and then removed. Any residual stickiness in the filaments may be counteracted by treatment with lubricants. Two or more of the united filaments may be formed simultaneously by subdividing the bundle of filaments into groups; after uniting the groups, the several larger filaments may be re-associated to form the composite thread; and the procedure may be such that only certain of the groups are united, the others not being treated with the solvent. The process is particularly applicable to the treatment of artificial filaments having a basis of cellulose acetate or other organic derivatives of cellulose, the solvent in these cases consisting of, for example, acetone alone or diluted with water, triacetin, ethyl lactate, and diacetone alcohol either alone or in admixture with water or alcohol; but the method may also be applied to artificial filaments of the reconstituted-cellulose type, the solvent being, for example, Schweitzer's reagent, zinc chloride solution, or sulphuric acid. The yarns or threads obtained may be used for the production of figured pattern, or other effects in woven or knitted materials, and they may be used in conjunction with other artificial threads of the same or different types, or with natural filaments or fibres; and they may be doubled or twisted with other yarns. As shown, the bundle of filaments 7, Fig. 1, is led out of a spinning cell 6, is passed round a feed roller 8 at which point the filaments may be associated with other threads drawn from one or more bobbins 16, and the filaments are then passed in contact with a wick 10 moistened with solvent, then in contact with a wick 12 containing lubricant, finally being wound up on a cap-spinning device 9. The moistening-device comprises a receptacle 13, Figs. 3 and 4, for the solvent, a rod or wire 20 mounted across the top of the receptacle and over which the wick 10 is doubled, and a removable cover 18 provided with a slot 22 to permit contact of the filaments with the wick. Filaments not to be treated with the solvent are allowed to rest on the solid portions of the cover, lips 23 being provided to prevent their passage into the slot. A similar shield arrangement 27, Fig. 5, may be employed when a roller 24 dipping into a bath 26 is used for the application of the solvent.