Method of manufacturing magnetic, plastic-bonded molded bodies

Details Method of manufacturing magnetic, plastic-bonded molded bodies Method of manufacturing magnetic, plastic-bonded molded bodies

1981-09-03

1984-04-24

Edmundson, F.

Compositions

Magnetic

With wax, bitumen, resin, or gum

G11B 578

Patent

active

044446705

ABSTRACT:
In the manufacture of magnetic, plastic bonded molded bodies having different magnetic properties but the same physical dimensions, it has been found that variations in the amount of the magnetic mass constituent result in a change in the shrinkage behavior of the mass during and after shaping. Therefore, the shaping tools must be adapted to compensate for this varied shrinkage behavior. In order to prevent this varied shrinkage behavior, according to the invention, magnetic material in the mass is replaced by nonmagnetic inorganic material having the same or similar shrinkage behavior, the constituent of plastic remaining the same in both cases. Since the ratio of binder to material to be bonded remains constant as regards volume, in the final product, molded bodies having strongly different magnetic properties can be manufactured without having to change the shaping tool.

REFERENCES:
patent: 3117092 (1964-01-01), Parker
patent: 3184807 (1965-05-01), Schornstheimer et al.
patent: 4082681 (1978-04-01), Takayama et al.
patent: 4126567 (1978-11-01), Otera et al.

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