Plastic article or earthenware shaping or treating: apparatus – Means applying electrical or wave energy directly to work – Electro-static or inductive field
Patent
1986-02-03
1988-06-07
Nozick, Bernard
Plastic article or earthenware shaping or treating: apparatus
Means applying electrical or wave energy directly to work
Electro-static or inductive field
55155, 55DIG39, 307400, 53111R, B28B 1700
Patent
active
047493488
ABSTRACT:
The present invention relates to a continuous method for manufacturing an electret filter medium from dielectric material having an open or porous structure, said method comprising the steps of continuously feeding a web of dielectric material with a substantially closed dielectric foil adjacent to at least one major face thereof into a corona discharge device, reducing the thickness of the web of dielectric material and charging the web of reduced thickness dielectric material by means of a corona discharge and to apparatus for carrying out said method.
REFERENCES:
patent: 2168027 (1939-08-01), Gladding
patent: 3391044 (1968-07-01), Kaghan et al.
patent: 3496255 (1970-02-01), Erxlehen et al.
patent: 3675393 (1972-07-01), Meade
patent: 3998916 (1976-12-01), Turnhout
patent: 4308223 (1981-12-01), Stern
patent: 4375718 (1983-03-01), Wadsworth et al.
patent: 4588537 (1986-05-01), Klaase et al.
Klaase Petrus T. A.
van Turnhout Jan
Minnesota Mining and Manufacturing Company
Nozick Bernard
Okubo Edward T.
Sell Donald M.
Smith James A.
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