Plastic and nonmetallic article shaping or treating: processes – With twining – plying – braiding – or textile fabric formation
Patent
1995-05-31
1997-07-01
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
With twining, plying, braiding, or textile fabric formation
28240, 28271, 264130, 2642107, 2642108, 26421112, 26421114, 425 66, 425 93, 425 94, 425104, 425363, 425464, D01D 516, D02G 116
Patent
active
056435150
ABSTRACT:
A method and apparatus for producing stretched yarns. PET yarns composed of a plurality of continuous and substantially fully stretched individual filaments are made by melt spinning and stretching them in an integral process having the steps of (a) simultaneous extrusion of the individual filaments for forming at least eight continuous filament strands of at least about ten filaments for solidification of the 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 portions of a first and second rotating draw cylinder having parallel axes of rotation and operated at different 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 rotation of the draw cylinders; (d) continuously applying an aqueous lubricant having the temperature of at least about 50.degree. C. to produce a continuous film of lubricant on each filament; and (e) passing the strands in contact with the peripheral surface portions of at least two additional rotating draw cylinders having an axes of rotation parallel to the first and second rotating draw cylinders and operating at differing speeds for achieving full stretch of the filaments.
REFERENCES:
patent: 4851172 (1989-07-01), Rowan et al.
patent: 4902462 (1990-02-01), Bert
"The Drawing of `Terylene`", I. Marshall and A. B. Thompson, J. Appl. Chem, 4, Apr., 1954, pp. 145-153.
"Steam Drawing Yarns", Fredrick A. Ethridge, President, Chiron Technology, Inc., IFJ/Jun. 1989, pp. 64-68.
"Complexities in PET Tire Yarn Processing and Characterization", Dr. W. G. Perkins, Fiber Forming Polymers Research, The Goodyear Tire & Rubber Co., Akron, Ohio, IFJ/Sep. 1987, pp. 42-50.
Filteco S.p.A.
Tentoni Leo B.
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