Paper making and fiber liberation – Processes and products – Article forming processes
Patent
1993-03-11
1994-11-29
Jones, W. Gary
Paper making and fiber liberation
Processes and products
Article forming processes
162103, D21J 312, D21J 500
Patent
active
053686950
ABSTRACT:
An acoustic diaphragm employed in a speaker or the like and a method for producing the acoustic diaphragm are disclosed. A diaphragm substrate is a diaphragm exhibiting air permeability, such as a paper diaphragm. The substrate is processed with filling by microfibrillated pulp. For filling, the substrate is immersed in the liquid dispersion of the microfibrillated pulp and the pulp is deposited on the substrate under suction. When the microfibrillated pulp is deposited on the substrate under suction, any voids present in the substrate are closed by the microfibrillated pulp so that air tightness is improved without lowering the sound quality or detracting from desirable properties of the diaphragm, such as low density, high toughness and low losses.
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James Brenda Adele
Jones W. Gary
Sony Corporation
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