Process for drawing tows of filaments in water

Details Process for drawing tows of filaments in water Process for drawing tows of filaments in water

1981-11-19

1983-11-29

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Reshaping running or indefinite-length work

2642905, 264DIG28, B29C 1702

Patent

active

044180322

ABSTRACT:
Polyesters are drawn in the form of thick tows in a predrawing and a main drawing step. Predrawing is carried out at 71.degree.-90.degree. C. in water, and the predraw ratio is chosen in such a manner that the main drawing can be carried out at a minimum of draw tension. Between predrawing and main drawing, the tows cool to below 40.degree. C. Suitable draw ratios for the predrawing are from 1:1.05 to 1:1.6. The main drawing is carried out either in steam or hot water.
FIG. 2 shows the curve of draw tension in the main drawing step as function of the draw ratio in the predrawing: there is a distinct minimum.

REFERENCES:
patent: 2918346 (1959-12-01), Paulsen
patent: 3894135 (1975-07-01), Riggert et al.

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