Method and apparatus for producing stretched yarns

Details Method and apparatus for producing stretched yarns Method and apparatus for producing stretched yarns

D - Textiles, Paper

01

D

D01D 5/098 (2006.01) D01D 5/16 (2006.01) D01F 6/62 (2006.01)

Patent

CA 2151203

PET yarns composed of a plurality of continuous and sub- stantially fully stretched individual filaments are made by melt spinning and stretching them in an integral process comprising (a) simultaneous extrusion of the individual filaments for forming at least eight continuous filament strands of at least about ten filaments for solidification of said filaments; (b) arranging the filaments to form a planar array of parallel and mutually distanced strands; (c) together pre-stretching the filaments by passing the strands in frictional contact with peripheral surface por- tions of a first and a second rotating draw cylinder having parallel axes of rotation and operated at differing speeds for achieving a pre-draw rate of from about 5 to about 20 % of the fully stretched state, each strand passing over the surface portions along a discrete path which is defined by a plane intersecting perpendicularly with the axes of rota- tion of the draw cylinders; (d) continuously applying an aqueous lubricant having a temperature of at least about 50°C to produce a continuous film of lubricant on each filament; and (e) passing the strands in contact with pe- ripheral surface portions of at least two additional rotat- ing draw cylinders having axes of rotation parallel to the first and second rotating draw cylinders and operating at differing speeds for achieving full stretch of the fila- ments.

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