| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing an electret sheet that keeps high piezoelectricity even in use under high temperatures.SOLUTION: In a method for producing an electret sheet of the present invention, an olefin resin sheet is cured at a surface temperature thereof lower than a melting point of the olefin resin, and then charges are injected into the olefin resin sheet to be charged. In an electret sheet obtained by the method of the present invention, discharge of charges due to flow of a crystal part of an olefin resin under high temperatures is prevented, so that piezoelectricity thereof is hardly deteriorated with time even in use under high temperatures and the electret sheet has excellent piezoelectricity over a long period of time. |
