Process for producing high knot strength polyamide monofilaments

Details Process for producing high knot strength polyamide monofilaments Process for producing high knot strength polyamide monofilaments

1980-08-20

1982-07-06

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Disparate treatment of article subsequent to working,...

Effecting temperature change

2642893, 2642896, 2642905, 264DIG28, B29C 1702

Patent

active

043382770

ABSTRACT:
Process for producing polyamide monofilament including partially orienting polyamide monofilament, steaming the partially oriented monofilament, heating and relaxing under low tension for disturbing the molecular orientation of the skin layer of said monofilament and drawing the relaxed monofilament to raise the molecular orientation of its core.
Monofilaments of this invention are high in knot strength and are two-layer structures comprising a core and a skin layer. The monofilaments have an average index of birefringence of at least about 50.times.10.sup.-3 and a degree of molecular orientation in the amorphous region of said skin layer of not more than about 0.5.

REFERENCES:
patent: 3090997 (1963-05-01), Au
patent: 3156750 (1964-11-01), Cuculo
patent: 3577500 (1971-05-01), Kohler et al.
patent: 3595952 (1971-07-01), Boyer et al.
patent: 3650884 (1972-03-01), Hansen
patent: 3742104 (1973-06-01), Jamison
patent: 4009511 (1977-03-01), Gauntt

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