作者: H. Wilson Pook
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摘要: A method for producing stable, layered electrets includes the steps of placing a thin sheet glassy polymer or copolymer high molecular weight, such as polyethylene terephthalate, between two, somewhat larger in planform, sheets polyvinyl chloride and/or acetate formulation, to form sandwich structure which is then compressed and heated approximately 300° F. At this temperature exterior are polarized displaced under pressure over interior charge interfaces sheets. The heat, furthermore, bonds peripheral edges each other thus forming hermetically closed container within charged will reside. Alternatively, two more electret (polymer) material may be pressed against point where plastic deformation occurs but below melting. surface charges on induce internal polarization fixed by rapid cooling.