Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1995-09-12
1997-05-20
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
26421115, 26421117, 264237, D01D 5088, D01D 512, D01F 662
Patent
active
056309767
ABSTRACT:
Polyethylene terephthalate yarn is prepared by spinning under high stress conditions in the transition region between oriented-amorphous and oriented-crystalline undrawn yarns by selection of process parameters to form an undrawn yarn that is a crystalline, partially oriented yarn with a crystallinity of 3 to 15 percent and a melting point elevation of 2.degree. to 10.degree. C. The spun yarn is then hot drawn to a total draw ratio between 1.5/1 and 2.5/1 with the resulting properties: (A) a terminal modulus of at least 20 g/d, (B) a dimensional stability defined by E.sub.4.5 +FS<13.5 percent, (C) a tenacity of at least 7 grams per denier, (D) a melting point elevation of 9.degree. to 14.degree. C., and (E) an amorphous orientation function of less than 0.75. The resulting treated tire cord provides high tenacity in combination with improved dimensional stability.
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Bheda Jayendra H.
Nelson Charles J.
Rim Peter B.
Turner James M.
Allied-Signal Inc.
Brown Melanie L.
Criss Roger H.
Rymarz Renee J.
Tentoni Leo B.
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