Method of molding synthetic resin and apparatus for use therein

Details Method of molding synthetic resin and apparatus for use therein Method of molding synthetic resin and apparatus for use therein

1995-10-10

1997-12-23

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

249 63, 249152, 264334, 425577, 425DIG5, 425DIG58, B29C 4544

Patent

active

057004153

ABSTRACT:
A molded article having a large undercut part is efficiently produced by a method of molding a synthetic resin with the use of an apparatus comprising an outer mold (S) and an inner mold (N) arranged so as to form a cavity (C) inside the outer mold (S), said inner mold (N) comprising a central mold segment having a part whose size is reduced toward its head and mold segments (6, 7) for forming an inner surface of a molded article which are supported so as to be able to meet and get apart from each other around the central mold segment (4) and divided into a plurality of separate segments, wherein said mold segments for forming the inner surface of the molded article are rendered movable toward the center of the apparatus by moving the central mold segment and wherein the inner mold (N) is withdrawn in the form of its size reduced as a whole from inside the molded article (21) supported in the outer mold (S).

REFERENCES:
patent: 4502660 (1985-03-01), Luther et al.
patent: 4541605 (1985-09-01), Kubota et al.
patent: 4627810 (1986-12-01), Von Holdt
patent: 4676732 (1987-06-01), Letica
patent: 4832307 (1989-05-01), Watanage et al.
patent: 4881891 (1989-11-01), Luther
patent: 4938679 (1990-07-01), Pietrorazio
patent: 5403179 (1995-04-01), Ramsey

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