Process for manufacturing industrial yarn

Details Process for manufacturing industrial yarn Process for manufacturing industrial yarn

1989-07-03

1991-09-17

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

26421117, 2642905, D01D 512

Patent

active

050493396

ABSTRACT:
Industrial yarn is used as a reinforcement in a wide variety of manufactured articles, such as conveyor belts, drive belts, V-belts, seat belts, hoses, tires, and the like. It is often important for the industrial yarn to have high tenacity, high modulus and dimensional stability. The present invention discloses an improved process for manufacturing highly uniform industrial yarn which exhibits high tenacity, high modulus and very low shrinkage. The present invention more specifically discloses a process for manufacturing industrial yarn having high tenacity, high modulus and low shrinkage which comprises melt spinning polyethylene terephthalate into spun filaments and subsequently drawing the spun filaments in a heated zone to a draw ratio of at least about 1.05:1; wherein the spun filaments have a birefringence of at least about 0.075 and a crystallinity of at least about 10%; wherein the spun filaments are in the heated zone for a residence time of at least 0.3 seconds; and wherein the yarn in the heated zone is at a temperature which is between the glass transition temperature and the melting temperature of the polyethylene terephthalate.

REFERENCES:
patent: 3361859 (1968-01-01), Cenzato
patent: 3452132 (1969-06-01), Pitzl
patent: 4113821 (1978-09-01), Russell et al.
patent: 4491657 (1985-01-01), Saito et al.
patent: 4669159 (1987-06-01), Bogucki-Land
patent: 4755336 (1988-07-01), Deeg et al.

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