Mitsubishi Denki Kabushiki Kaisha

Tadashi Iwabuchi

Osamu Hayashi

Takeshi Kawakami

Disclosed is a water-cooled winding for an electromagnetic stirrer, which comprises a coil including a plurality of wound flat type wires having a wire-insulating turn insulation, and a porous polyamide fiber having an air permeation rate not higher than 25 seconds/100 cm.sup.3 of air covering the periphery of the coil, which is impregnated with an epoxy resin composition. In this water-cooled winding, the polyamide fiber is sufficiently impregnated with the epoxy resin composition and this epoxy resin composition is cured stably and assuredly. Accordingly, the mechanical rigidity of the winding is sufficiently high, and the water resistance of the winding is highly improved and is maintained for a long time, with the result that the life of the winding is greatly prolonged.

Water-cooled winding for electromagnetic stirrer

A thin insulating sheet comprises an associated mica sheet containing 1 to 9 wt. % of a polymer fibril which is melt-bonded to a polymer film or a porous polymer sheet and impregnated with a resin in a prepreg form.

Thin insulating mica sheet and insulated coil

A thin insulating sheet comprises an associated mica sheet containing 1 to 9 wt. % of a polymer fibril which is melt-bonded to a polymer film or a porous polymer sheet.

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Nagasaki, Japan

Tadashi Iwabuchi