Patent ID: 6818092
Filing Date: 2004-11-16
Classification: B32B,H01G,H04R,Y10T

Abstract:
A method of manufacturing a multi-layer electret having ultra-high charge stability, comprising:a first step of placing an FEP film on a metal plate; a second step of heating the metal plate on which the FEP film was placed at a high temperature and applying high pressure thereto, whereby the FEP film and the metal plate melting-adhere to each other; a third step of placing a PTFE film on the FEP film attached to the metal plate; a fourth step of heating the metal plate on which the PTFE film and the FEP film were placed and applying high pressure thereto, whereby the PTFE film melting-adheres to the FEP film; a fifth step of cooling the PTFE film and the FEP film placed on the metal plate, to accomplish an electret; and a sixth step of charging the cooled electret with charges.