Dimensionally stable polyester yarn for high tenacity...

Details Dimensionally stable polyester yarn for high tenacity... Dimensionally stable polyester yarn for high tenacity...

D - Textiles, Paper

01

F

18/624

D01F 6/62 (2006.01) D01D 5/12 (2006.01)

Patent

CA 1336036

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 to 10°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 E4.5 +FS < 13.5 percent, (C) a tenacity of at least 7 grams per denier, (D) a melting point elevation of 9 to 14°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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