Patent GB-519186-A (GB)
Title: Improvements in fabric-making materials
IPC: D01D5/22
Filed: 1938-09-15
Abstract: 519,186. Yarns and threads; spinning &c. machines. BLOCH, G., Sept. 15, 1938, Nos. 27001 and 27002. Convention dates, Sept. 16, 1937, and Aug. 16, 1938. [Classes 120 (ii) and 120 (iii)] [Also in Group IV] An artificial filament is produced in such manner that along its length there are local portions of greater thickness alternating with intermediate portions of less thickness, the local portions including added mound-like protrusions of solidified film-forming fluid of similar composition to that of the filament body. Yarns containing such filaments have air-spaces between the filaments. In forming yarns from the filaments, some of the filaments may be treated so as to have overlapping or folded sections. Yarns may be produced in which filaments with protrusions and overlapping sections form a core for other continuous filaments. Filaments with protrusions are shown in Fig. 1. The filaments after production may be wound directly on bobbins or cut to staple fibre. As shown in Figs. 12, 13, a non-rotatable sleeve 62 carries a spider 63 supporting feed-rollers 64. The sleeve is held against rotation about its longitudinal axis, but due to eccentric mounting the axis of the sleeve moves in a circular orbit. Filaments are fed between pairs of endless bands 75. Rotation of shaft 84, hollow shaft 67, and bushing 60 causes rollers 64 to describe a circular orbit and deposit the filaments in circular or spiral fashion upon the belts. Lineal speed of belts 75 is less than that of rollers 64 so that folding of the filaments is produced. Orbital motion of rollers 64 may be omitted. The groups of folded filaments are gathered together by rolls 27, 28. The device 51 may be rotated. The folds may be set by sizing. The filaments may be cut at the folded points by feeding them to a device as shown in Fig. 14. They are over-fed to the rolls of the gathering device 90 so that they lie back and forth across a cutting wire 91 and they are cut when seized by the nip - of the rolls. As shown in Fig. 16, two or more groups of filaments are fed at different speeds to the gathering device 95 so that one group forms loops which are compressed by rolls into folds. The yarns or filaments may be used in the production of felts or woven or other fabrics. The process is applicable to the production of filaments of regenerated cellulose, cellulose esters or ethers or resins. The Specification as open to inspection under Sect. 91 comprises also the production of filaments with overlapping portions irrespective of whether the filaments have protrusions or are associated with such filaments. Reference is made to glass filaments. Other means for producing overlapped filaments by cutting are described. Several separated groups of filaments are passed to rotating cutting knives which sever each group of filaments in turn, the groups of filaments being then brought together and associated as a yarn. Filaments having protrusions due to incorporation of gas producing substances in the spinning solution may be obtained. This subject-matter does not appear in the Specification as accepted.