Plastic and nonmetallic article shaping or treating: processes – Carbonizing to form article – Agglomeration or accretion
Patent
1984-06-27
1986-03-18
Lowe, James
Plastic and nonmetallic article shaping or treating: processes
Carbonizing to form article
Agglomeration or accretion
264235, 264236, 26427213, 26427219, B29C 3502
Patent
active
045767688
ABSTRACT:
The invention relates to a method for impregnating and embedding electrical windings, especially coils of transformers, by means of an impregnating or casting resin based upon polyepoxide-polyisocyanate mixtures in the presence of a reaction accelerator latent at the processing conditions, which employs conditions that prevent the formation of gas and shrinkage voids in the cast in winding. To this end, the resin including, if applicable, additives, is dried at reduced pressure and while stirring at temperatures of up to 110.degree. C. and the winding is cast-in with the dried resin at reduced pressure and at temperature of up to 110.degree. C.; then the reduced pressure is removed and the winding is exposed to overpressure. Subsequently, generating by an elevated temperature in the electrical winding by Joule heat in the conductor, the cross-linking reaction of the resin is started and is controlled as a function of the reaction heat, until the winding is removed from the mold and post-hardened.
REFERENCES:
patent: 4070416 (1978-01-01), Narahara et al.
patent: 4131600 (1978-12-01), Ihlein et al.
patent: 4333900 (1982-06-01), Carey
Alber Friedrich
Bendel Wolfgang
Markert Helmut
Rogler Wolfgang
Lowe James
Siemens Aktiengesellschaft
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