General Electric Company

William H Gottung

Kevork A Torossian

Electrical insulating sheet material characterized by a coating of thermosetting resinous adhesive material distributed over two sides of a sheet of aramid paper, in combination with a pattern of pressure sensitive adhesive material applied to one side of the aramid paper sheet.

Electrical insulating sheet material and electrical winding made

Electrical insulating sheet material characterized by a coating of thermosetting resinous adhesive material distributed over two sides of a sheet of aramid paper, in combination with a pattern of pressure sensitive adhesive material applied to one side of the aramid paper sheet. An electrical winding insulated with the sheet material of the invention is characterized by incorporating sheets of the insulating material between facing flat sides of the turns of the winding with the sheets initially held in position on the winding during early phases of its manufacture by the pressure sensitive adhesive. In the final manufactured form of the winding its turns are compressed and baked to thermally cure the thermosetting resinous adhesive material and bond it to the sides of the winding and the aramid paper sheet. Due to the materials and structure of the invention, the pressure baking operation does not force either the resinous adhesive material or the aramid paper to creep sufficiently to extrude them from between the facing sides of the winding; accordingly, the edges of the winding need not be scraped or otherwise cleaned in order to place the winding in condition for final assembly in a dynamoelectric machine. In alternative embodiments of the invention only one side of a sheet of non-cellulosic paper is coated with thermosetting resin and a pattern of pressure sensitive adhesive.

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Ballston Lake, NY, United States of America

William H Gottung