Process for producing high strength, high modulus thermoplastic

Details Process for producing high strength, high modulus thermoplastic Process for producing high strength, high modulus thermoplastic

1991-03-28

1992-12-15

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264181, 2642104, 2642108, D01D 5084, D01D 5092

Patent

active

051715040

ABSTRACT:
The invention provides improved thermoplastic high strength, highly oriented fibers and a process for producing the fibers by melt spinning a thermoplastic polymer to form a threadline, preferably passing the threadline through a thermal conditioning zone and then quenching the threadline. The quenched threadline is passed through a hydraulic drag bath maintained at a temperature of greater than the glass transition temperature of the polymer which substantially increases the threadline stress and results in drawing of the threadline. The threadline is withdrawn from the drag bath at a withdrawal rate of at least 3,000 meters per minute.

REFERENCES:
patent: 3002804 (1961-10-01), Kilian
patent: 3053611 (1962-09-01), Griehl
patent: 3086275 (1963-04-01), Pritchard
patent: 3221088 (1965-11-01), Martin
patent: 3361859 (1968-01-01), Cenzato
patent: 4909976 (1990-03-01), Cuculo et al.

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