Controlling release of molded material from mold during curing

Details Controlling release of molded material from mold during curing Controlling release of molded material from mold during curing

1980-02-15

1982-01-19

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Changing mold size or shape during molding or with shrinkage...

264317, 264336, 264338, B29D 1100

Patent

active

043116540

ABSTRACT:
A method and mould for moulding material requiring heat treatment for setting or curing, e.g., for making ophthalmic lenses. The mould comprises an annular gasket and two opposed die members which together define a moulding cavity. One of the die members is made in part of a fusible material, e.g. paraffin wax, which defines its moulding surface. After filling the mould the moulding material is subjected to heat treatment. The drop point or softening point of the fusible material falls within the range of temperatures of heat treatment so that in the course of such heat treatment of fusible material effectively releases the moulded material. This relieves stresses which would otherwise develop due to shrinking of the moulded material.

REFERENCES:
patent: 2279859 (1942-04-01), Crawford
patent: 3077005 (1963-02-01), Sokol
patent: 3380718 (1968-04-01), Neefe
patent: 3423488 (1969-01-01), Bowser
patent: 3821333 (1974-06-01), Goodwin et al.
patent: 3935292 (1976-01-01), Okubo
patent: 3938775 (1976-02-01), Sarofeen
patent: 3944637 (1976-03-01), Bond et al.

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