Acoustic diaphragm and method for producing same

Details Acoustic diaphragm and method for producing same Acoustic diaphragm and method for producing same

1993-04-20

1993-12-28

Gellner, Michael L.

Acoustics

Diaphragm

Critically defined material or coating

181170, G10K 1300

Patent

active

052741990

ABSTRACT:
An acoustic diaphragm is obtained by forming micro-fibrillated cellulose into a web by a process similar to a paper-making process. The micro-fibrillated cellulose is the cellulose obtained by beating to the Canadian standard freeness of not more than 300 ml, or bacterial cellulose. Since the micro-fibrillated cellulose is poor in wet strength, it is reinforced by a reinforcement element and, in this state, is formed into the web on a wire screen. The reinforcement element may be detached after forming the web, or may be left laminated with the cellulose web so that the resulting composite product is used as the acoustic diaphragm.

REFERENCES:
patent: 3935924 (1976-02-01), Nagao et al.
patent: 4742164 (1988-03-01), Iguchi et al.
patent: 5031720 (1991-07-01), Ohta et al.
Patent Abstracts of Japan, vol. 11, No. 145, Dec. 12, 1986 (Masatoshi).
Patent Abstracts of Japan, vol. 8, No. 277, Aug. 18, 1984 (Takanori).

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