Abstract
The ElectroMechanical Film (EMFi) is a thin, cellular, biaxially
oriented polypropylene film that can be used as an electret. Having a
special voided internal structure and high resistivity, it is capable of
storing large permanent charge. The charge is injected by a corona
method using ∼10 kV cm−1 fields, thus creating internal
electrical discharges inside the cellular structure. Films of different
thickness and elasticity can be manufactured. The thickness in sensor
and actuator applications is typically 30–70 μm. When metallized on both
sides, EMFi is capable of measuring pressure and force changes offering
large application potential in different fields of technology including
microphones and also actuators. New loudspeaker panels based on EMFi
are only a few millimeters thick.
Original language | English |
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Pages (from-to) | 95 - 102 |
Number of pages | 8 |
Journal | Sensors and Actuators A: Physical |
Volume | 84 |
Issue number | 1-2 |
DOIs | |
Publication status | Published - 2000 |
MoE publication type | A1 Journal article-refereed |