Method and apparatus for injection molding

Details Method and apparatus for injection molding Method and apparatus for injection molding

1990-10-16

1992-05-19

Simmons, David A.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

249 59, 249 63, 249 64, 249144, 249184, 425438, 425577, 425DIG58, 425443, B29D 100

Patent

active

051146550

ABSTRACT:
A method and apparatus are described for forming a closure device having a cylindrical plug and a cylindrical collar extending coextensively and coaxially from a cap. The apparatus includes an outer mold defining an injection mold cavity. A cylindrical hollow outer core extends into the injection mold cavity and a cylindrical inner core extends into the injection mold cavity within the hollow outer core. Pushing means separate the molded part from the inner core. A stripper separates the part from the outer core by engaging an annular shoulder on the part. The part is pushed free of the mold's inner core after the outer mold is removed but before the stripper is advanced to engage the annular shoulder.

REFERENCES:
patent: 3915613 (1975-10-01), Ruch
patent: 4541795 (1985-09-01), Cole
patent: 4552328 (1985-11-01), Dutt et al.

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