ElectroMechanical Film (EMFi): A new multipurpose electret material

Mika Paajanen (Corresponding Author), Jukka Lekkala, Kari Kirjavainen

Research output: Contribution to journalArticleScientificpeer-review

229 Citations (Scopus)

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 languageEnglish
Pages (from-to)95 - 102
Number of pages8
JournalSensors and Actuators A: Physical
Volume84
Issue number1-2
DOIs
Publication statusPublished - 2000
MoE publication typeA1 Journal article-refereed

Fingerprint

Electrets
electrets
Actuators
actuators
Loudspeakers
Polypropylenes
loudspeakers
Microphones
microphones
polypropylene
coronas
Elasticity
elastic properties
electrical resistivity
sensors
Sensors

Cite this

Paajanen, Mika ; Lekkala, Jukka ; Kirjavainen, Kari. / ElectroMechanical Film (EMFi) : A new multipurpose electret material. In: Sensors and Actuators A: Physical. 2000 ; Vol. 84, No. 1-2. pp. 95 - 102.
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ElectroMechanical Film (EMFi) : A new multipurpose electret material. / Paajanen, Mika (Corresponding Author); Lekkala, Jukka; Kirjavainen, Kari.

In: Sensors and Actuators A: Physical, Vol. 84, No. 1-2, 2000, p. 95 - 102.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Kirjavainen, Kari

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