Method of producing banded fibers from a thermoplastic sheet

Details Method of producing banded fibers from a thermoplastic sheet Method of producing banded fibers from a thermoplastic sheet

1973-01-17

1976-04-13

White, Robert F.

Plastic and nonmetallic article shaping or treating: processes

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

Making hole or aperture in article

264DIG47, B29C 1702, B29D 2700

Patent

active

039504751

ABSTRACT:
Interconnected fibres banded by cross-sectional orientation and morphology differences, in an array which can be bundled up to separate the fibres at least partially. A thermoplastic sheet emboding areas of different degrees of fibrillation is cold drawn to initiate longitudinally extending cracks in the areas of lower resistance to fibrillation such that the cracks terminate at the areas of higher resistance to fibrillation. The sheet is then further drawn at a higher temperature to open the cracks and to cause the cracks to propagate through the areas of higher resistance to fibrillation. Both drawing steps are performed without lateral extension.

REFERENCES:
patent: 3441638 (1969-04-01), Patchell et al.
patent: 3485705 (1969-12-01), Harmon
patent: 3488415 (1970-01-01), Patchell et al.
patent: 3494522 (1970-02-01), Kim et al.
patent: 3511742 (1970-05-01), Rasmussen
patent: 3541197 (1970-11-01), Hughes
patent: 3632716 (1972-01-01), Fairbanks
patent: 3851034 (1974-11-01), Harmon

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