Stabilization of tows of filamentary material

Details Stabilization of tows of filamentary material Stabilization of tows of filamentary material

1974-09-20

1977-01-18

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

28 1HF, 131267, 156274, 156441, 156380, 156543, 219 1053, 219 1081, 219 1069, B29H 902, B04H 308

Patent

active

040037746

ABSTRACT:
A tow of filamentary dielectric material, wrapped in a flexible conveyor belt of low permittivity material such as PTFE, is passed through a stationary tube also of low permittivity material. This tube is disposed in resonating cavities wherein a high frequency electric field of 3.10.sup.8 to 3.10.sup.11 Hz heats the tow. After cooling, the tow forms a tube which may be cut to form cigarette filters.

REFERENCES:
patent: 1900573 (1933-03-01), MacArthur
patent: 2438155 (1948-03-01), Diller
patent: 2608637 (1952-08-01), Dakin et al.
patent: 3106501 (1963-10-01), Cobb et al.
patent: 3202493 (1965-08-01), Heil
patent: 3297512 (1967-01-01), Cobb et al.
patent: 3435534 (1969-04-01), Knobloch et al.
patent: 3516885 (1970-06-01), Sexstone et al.
patent: 3819435 (1974-06-01), Roberts et al.
patent: 3864183 (1975-02-01), Hori
Modern Plastics Encyclopedia, vol. 498, No. 10A, pp. 46 and 48, (10-1972).

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