Patent GB-1200669-A (GB)
Title: High speed spinning method and apparatus for manufacturing jet bundle yarn
IPC: G01N33/36
Filed: 1967-08-11
Abstract: 1,200,669. Jet bundle yarn. MITSUBISHI RAYON CO. Ltd. 11 Aug., 1967 [29 Dec., 1966; 8 Feb., 1967; 13 Feb., 1967; 16 May, 1967], No. 37108/67. Headings D1F and D1W. A method of making a jet bundle yarn comprises drafting a fibrous material 1a, advancing the drafted material through a device 7 for collecting the fibrous material into a bundle, subjecting the advance material to a vortical fluid stream in such manner that the vortical fluid stream effects is disturbing action upon the drafted material while the said material passes through the device 7, the temperature of the vortical fluid stream being maintained as high as to plasticize the fibrous material, taking up the material from the vortical fluid stream in the form of a jet bundle yarn and winding the yarn onto a package. The jet bundle yarn produced comprises a core portion having a relatively lengthwise arrangement of component fibres and a peripheral portion of a net-like configuration of component fibres encircling the core portion with a mutually and partially fixed relation, the component fibres of the peripheral portion being partially fixed to each other at their contacting portions and ends. Synthetic fibres presenting 5% thermal-shrinkage at 130‹C may be mixed into the fibrous material, the vortical fluid stream being maintained at a temperature higher than 130‹C. Plasticizers or bonding agents may be incorporated into the fibrous material, and the fluid used is preferably superheated steam. Drafting of the fibrous material is effected at speeds over 300 meters per minute. The material may be substantially stretched during the operation and may be heated at a temperature above 80‹C after the operations. The jet bundle yarn may be twisted. Apparatus for making the jet bundle yarn comprises in combination, a draft element containing at least two pairs of rollers, a device 7 for collecting the fibrous material into a bundle located downstream of the draft element, means for subjecting the drafted material to a vortical fluid stream in such a manner that the stream effects no disturbing action on the drafted material while it passes through the device 7, a pair of take-up rollers for taking-up the jet bundle yarn from the vortical fluid stream and means for packaging the jet bundle yarn. The device 7 is provided with an aspirator type inlet 10 and a fluid stream conduit pipe 11 extending downstream from an inside portion of said inlet in such a manner that at least one stream supply inlet 12 of said inlet is tangentially offset with respect to a starting portion of said pipe 11. Several supply inlets 12 may be provided at different positions along the longitudinal axis of the fluid stream. A conical space of circular cross-section is formed between the aspirator type inlet 10 and the starting portion of the fluid stream pipe 11, the space connecting the supply inlet 12 with the pipe 11. A jacket may be provided spaced from and surrounding the aspirator type inlet 10 and the starting portion of the fluid stream pipe 11, the jacket being provided with at least one fluid stream inlet. Means may be provided for controlling the drafting operation.