GB504399A - Improvements in or relating to the manufacture of staple fibre yarns or like products - Google Patents

Abstract

504,399. Yarns etc.; artificial threads; unwinding yarns &c. POOL, W. Oct. 29, 1937, No. 29632. [Classes 120 (ii) and 120 (iii)] [Also in Group IV] A staple fibre yarn or like product of substantially uniform denier is made from a package formed of a bundle of filaments having a denier varying inversely with the diameter at which it is wound on the package, the bundle being withdrawn from the package, which is positively rotated at a uniform angular speed, at a rate varying inversely with the denier of the bundle and the filaments of the bundle being then separated from each other and the ends of the separated filaments cut into groups of separated fibres of predetermined length, which groups are assembled, so that the forward ends of the fibres of each group extend beyond the rearward ends of the fibres of the preceding group, and thereafter compacted to form the coherent staple fibre yarn or like product. The package may be formed by extruding a spinning solution in the form of a bundle of continuous filaments and drawing the filaments from the point of extrusion and winding them on a package support by positively rotating the support at a uniform angular speed ; the wound bundle may be split into two bundles during unwinding and the bundle may be divided into two bundles immediately prior to winding and the two bundles led to the package slightly spaced from each other. As shown in Fig. 1, a bundic 1 drawn from the cabinet 2 is divided into two bundles 4 which are separately guided in slightly spaced relationship on to the package support 8 by guides 5, 6 carried by a traversing shaft 18. The support 8 is removably clamped on a spindle 9 against a driving flange 12 thereon which is driven by a roller 16, the spindle being pivotally secured to an arm 14 swingable about a shaft 15 so that when the package is completed the arm 14 can be raised and the spindle pivoted outwards for the removal of the package ; during removal the filaments delivered by the cabinet are collected on the roller 16, being subsequently moved to a narrow portion 21 and cut off. The wound package 7, Rig. 4, is secured between a pair of flanges 24 for unwinding, the flanges resting on two pairs of driving wheels 25 driven from a shaft 27 which also drives rollers 33 at a speed greater than the rate of delivery of the bundles 4 from the package 7; the bundles from the package pass through guides 32 on a reciprocating bar 40 and by adjusting the rods 38 carrying the guides 32, the arcs of contact made by the filaments with the rollers 33 may be adjusted. The rollers 33 are surfaced with rubber or other material appropriately removed in the electrostatic scries from the material of the filaments as described in Specification 504,400 and from the rollers each bundle is led through a guide tube 41 having an internal nozzle supplied with compressed air through a pipe 43, the air current drawing the filaments from the package 7 are conducting them to a guide member 45 also provided with an internal air nozzle supplied from a pipe 47 with comprossed air which blows the filaments through a diverging nozzle 48 and spreads them out in the form of a flat band ; the band of separated filaments is then cut into successive groups by a cutter 50 in the manner described in Specification 484,190, and the successive groups of separated fibres are drawn into a band 51 by suction so that the forward ends of the fibres of cach group extend beyond the rearward ends of the fibres of the preceding group, the fibres being then compacted into a coherent staple fibre yarn or like product by rubbing bands 53. Specification 489,273 also is referred to.