Patent ID: 7927461

Claim:
A method of manufacturing an aramid paper which is directly thermally bondable with the same material or a polyester film at a thermal bonding temperature ranging from 90° C. to 200° C., the method comprising: obtaining an aramid paper made from aramid fibrid and short fiber both as main constituents and formed into a paper shape, the aramid paper having two sides and a surface and a thermal bonding face provided on at least one of the sides of the aramid paper; and applying a plasma treatment to the aramid paper by a plasma treatment apparatus with an inner electrode, the plasma treatment having an intensity ranging from 30 W·min/m 2 to 1500 W·min/m 2 , wherein the thermal bonding face has a composition ratio (O/C) of the number of oxygen atoms (O) to the number of carbon atoms (C) ranging between 120% and 250% of a theoretical value of an atom number ratio.