| 摘要 |
PURPOSE:To obtain the title form of high grade, with high adhesiveness, having uniform structure, useful as a filter unit, etc., by depositing nonwoven fiber on the surface of a mold core structure, as the base, of specific shape to make a composite. CONSTITUTION:A delivered fiber 4 is introduced into an electric field produced between the applied electrodes 5a, 5b and a mold core structure grounded with at least the surface consisting of a material of a resistivity of <=10<10>OMEGA.cm to be made into electret fiber and said electret fiber is deposited on at least part of said surface, thus obtaining the objective form. Preferably, the resultant electret nonwoven fiber layer is such as to be >=1X10<-10>Q/cm<2> for the surface electric charge density, with internal fiber density difference, being made of melt blow fiber. |
