Method of manufacturing acoustic diaphragm

Details Method of manufacturing acoustic diaphragm Method of manufacturing acoustic diaphragm

1991-07-25

1993-01-12

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Controlling varying temperature or plural heating steps

264291, 264292, 26433112, 26433119, 423448, C01B 3104

Patent

active

051788047

ABSTRACT:
A method of manufacturing a dome- or cone-like acoustic diaphragm by a process including the step of heating a polymeric film comprising an aromatic polyimide, a polyoxadiazole or an aromatic polyamide, to a temperature range of 2,000.degree. C. or above, and the step of pressure molding. The heating and the pressure molding may be carried out at the same time when the polymeric film is heated for its graphitization. Alternatively, the pressure molding may be carried out while the polymeric film having been graphitized by the heating is further heated. Still alternatively, a polymeric film having been pressure-molded in the course of heat polycondensation of a polyamic acid may be graphitized by heating.

REFERENCES:
patent: 4876077 (1989-10-01), Murakami
patent: 4954193 (1990-09-01), Murakami et al.
patent: 4983244 (1991-01-01), Murakami et al.
patent: 5043185 (1991-08-01), Murakami et al.

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