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US 4,376,726 AGranted
Method of manufacturing composition for bonded magnets
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsTadashi Sakaira, Hideyuki Yamada, Tamotsu Wakahata
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Abstract
An improved method of manufacturing a composition for bonded magnets in which deterioration of the composition due to heat is prevented, while uniform dispersion of ferrite powder is achieved for stabilization of physical properties and various characteristics of the resultant bonded magnets.
Claims9
A method of preparing a composition for manufacturing bonded magnets, which comprises the steps of:
- (a) introducing a ferrite-resin composition comprising ferrite powder and a solid resin material bonding agent for said powder into a closable kneading apparatus equipped with a stirring blade member, the amount of said ferrite-resin composition being less than 90% of the available interior volume of said kneading apparatus,
- (b) closing said kneading apparatus,
- (c) mixing the components of said ferrite-resin composition by rotating said stirring blade member at a sufficiently high speed to raise the temperature within said kneading apparatus selectively above the melting of softening point of said resin material, to form a uniform dispersion of the components of said ferrite-resin composition,
- (d) transferring said uniform dispersion, at a temperature no higher than a temperature 10.degree. C. higher than said melting or softening point of said resin material, to a tank, and
- (e) subjecting said uniform dispersion to cooling, stirring and crushing in said tank, to form granules of said uniform dispersion.
2 more elements
Dependencies are inferred from the claim text.