Method for continuously polarizing thermoplastic film

Details Method for continuously polarizing thermoplastic film Method for continuously polarizing thermoplastic film

1975-09-10

1976-10-12

Newsome, John H.

Coating processes

Measuring, testing, or indicating

Thickness or uniformity of thickness determined

29592, 179111E, 307 88ET, 427100, H01G 702

Patent

active

039859142

ABSTRACT:
For making a piezoelectric thermoplastic film device, a polar thermoplastic film is provided on both sides thereof with conductive layers which function as polarizing electrodes during the polarizing step. In a polarizing zone, a polarizing voltage is applied across the electrodes while the film is heated to a suitable polarizing temperature. To reduce undesirable capacitive effects, at least one electrode layer is separated into sections by narrow insulating regions extending transversely across the film. After cooling, the polarizing voltage and the accumulated electric charges in the film are removed.

REFERENCES:
patent: 3496013 (1970-02-01), Baxt et al.
patent: 3696505 (1972-10-01), Turnhoot

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