Method for freeze molding

Details Method for freeze molding Method for freeze molding

1996-03-27

1999-01-19

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

With step of cooling to a temperature of zero degrees c. or...

419 36, 419 37, C04B 3328, B22F 100

Patent

active

058611150

ABSTRACT:
The present invention includes a method for freeze molding, comprising the steps of: mixing poly(vinyl alcohol) or a modified additive thereof with a material slurry to obtain a mixture; pouring the mixture into a molding die; and subjecting the mixture in a molding die to at least one cycle of cooling and heating so as to obtain a compact. A compact obtained in this method is free from melting and can maintain its configuration even if the compact is kept at a temperature of freezing point or higher. Further, since the method does not require vacuum drying, the compact can easily be dried.

REFERENCES:
patent: 2765512 (1956-10-01), Nesbit
patent: 3816572 (1974-06-01), Roelofs
patent: 4664857 (1987-05-01), Nambu
patent: 4808353 (1989-02-01), Nambu
patent: 4965027 (1990-10-01), Takahashi
patent: 5014763 (1991-05-01), Frank
patent: 5047181 (1991-09-01), Occhionero
Eisenkolb, "Fortschritte der Pulvermetallurgie", Band I Grundlagen der Pulvermetallurgie, Akademie Verlag, Berlin, 1963, S. 292-297.

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