Continuous process for production of latent crimp filaments

Details Continuous process for production of latent crimp filaments Continuous process for production of latent crimp filaments

1976-09-17

1979-06-26

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Forming continuous work followed by cutting

264168, 264176F, 264210F, 264248, B29C 1700, D01D 522

Patent

active

041592972

ABSTRACT:
A process for the production of crimped filaments of semi-crystalline polyolefins or blends of polyolefins with other materials by melt drawing at 100 meters per minute or less, rapidly and asymmetrically cooling at least a portion of the filaments, forming the filaments into a tow and subjecting the tow to a heat treatment without drawing at at least 100.degree. C. and thereafter drawing the filaments in two stages, the last of which is at a temperature of at least 70.degree. C. With the practice of the process of this invention, there is provided a useful crimp of at least two crimps per centimeter which develops after the filaments are relaxed and subjected to a further heat treatment which may be applied either to the filaments or to products produced therefrom when in a relaxed state subsequent to drawing.

REFERENCES:
patent: 3152380 (1964-10-01), Martin
patent: 3256258 (1966-06-01), Herrman
patent: 3382306 (1968-05-01), Oppenlander
patent: 3422171 (1969-01-01), Oppenlander
patent: 3432590 (1969-03-01), Papps
patent: 3549743 (1970-12-01), Riordon
patent: 3560604 (1971-02-01), Papps
patent: 3562369 (1971-02-01), Chopra et al.
patent: 3577498 (1971-05-01), Matsuo et al.
patent: 3663676 (1972-05-01), Lulay
patent: 3671619 (1972-06-01), Fitzgerald et al.

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