Method of manufactruring 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,
• providing the polyphenylene sulfide film subjected to a plasma surface treatment, 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.

The method according to claim 10, wherein the laminate has a three-layered structure of the aramid paper, the polyphenylene sulfide film, and another ply of the aramid paper laminated in this order or has a two-layered structure of the aramid paper and the polyphenylene sulfide film.

An electric rotating machine-use insulation material being to be inserted in each slot of an iron core of the electric rotating machine and having a wedge-shaped cross section,

• the wedge-shaped insulation material comprises an adhesive-free laminate of an aramid paper and a polyphenylene sulfide film, the aramid paper made from aramid fibers and aramid pulp, the aramid paper and the polyphenylen sulfide film having been subjected to plasma surface treatment, the laminate having a three-layered structure of the aramid paper, the polyphenylen sulfide film, and another ply of the aramid paper in this order or having a two-layered structure of the aramid paper and the polyphenylen sulfide film, the layered structure with adhesive-free non-melting compression bonding.

An insulation structure for an electric rotating machine, comprising an insulation material having a wedge-shaped cross section and being inserted in each slot of an iron core of the electric rotating machine;

• and
• the wedge-shaped insulation material being a laminate having a three-layered structure of an aramid paper, a polyphenylene sulfide film, and another ply of the aramid paper laminated in this order from a slot surface side, the aramid paper made from an aramid fiber and an aramid pulp, the aramid papers and polyphenylene sulfide film having been subjected to plasma surface treatment, and the layered structure with adhesive-free non-melting compression bonding, or the wedge-shaped insulation material being a laminate having a two-layered structure of an aramid paper and a polyphenylene sulfide film laminated in this order from the slot surface side, the aramid paper made from an aramid fiber and an aramid pulp, the aramid paper and polyphenylene sulfide film having been subjected to plasma surface treatment, the layered structure with adhesive-free non-melting compression bonding.