Method of manufacturing adhesive-free laminate of aramid paper and polyphenylene sulfide film, and insulation material and insulation structure for rotating electric machinery

A method of manufacturing an adhesive-free laminate of an aramid paper and a polyphenylene sulfide film, comprising the following steps of:

• providing the aramid paper made from aramid fibers and aramid pulp and subjected to a plasma surface treatment, wherein the aramid paper has a thickness of 30 to 150 μm,
• providing the polyphenylene sulfide film subjected to a plasma surface treatment, wherein the polyphenylene sulfide film has a thickness of 50 to 200 μm, and
• laminating and bonding the plasma surface treated aramid paper and the plasma surface treated polyphenylene sulfide film at a roll temperature of 30° C. or higher but lower than 50° C. under a linear load of 500 kgf/cm or higher with a pair of press rolls, or at a roll temperature of 50° C. or higher but lower than 100° C. under a linear load of 200 kgf/cm or higher with a pair of press rolls.