Manufacture of unique polyethylene terephthalate fiber

Details Manufacture of unique polyethylene terephthalate fiber Manufacture of unique polyethylene terephthalate fiber

1974-03-13

1976-06-29

White, Robert F.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264290T, B29C 1702, D01D 510, D01D 516

Patent

active

039668673

ABSTRACT:
Polyethylene Terephthalate fiber having a relative viscosity of 1.50 to 1.70 is drawn in two stages. In the first stage the fiber is drawn at a draw ratio of from about 3.8 to 4.2 at a temperature of about 70.degree.C to about 100.degree.C. In the second stage the fiber is drawn in superheated steam at a temperature of about 210.degree.C to 250.degree.C at a draw ratio such that the total draw ratio for the two stages is from about 5.6 to 6.0. The fiber produced has a tenacity of at least about 7.5 grams per denier, an elongation at break of at least about 9%, an elongation of not more than about 5% under a load of 5 grams per denier and a shrinkage of less than 4% when kept under a tension of 0.05 grams per denier for 4 minutes at about 160.degree.C. The fiber is especially suitable for reinforcing bitumen-containing materials.

REFERENCES:
patent: 2556295 (1951-06-01), Pace, Jr.
patent: 3216187 (1965-11-01), Chantry
patent: 3413797 (1968-12-01), Chapman
patent: 3452132 (1969-06-01), Pitzl
patent: 3564835 (1971-02-01), Keefe, Jr. et al.

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