Method and apparatus for molding a closure cap

Details Method and apparatus for molding a closure cap Method and apparatus for molding a closure cap

1984-03-16

1989-02-07

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

425120, 425130, 425809, 425DIG5, B29C 4516, B29D 100

Patent

active

048030317

ABSTRACT:
An improved molded closure cap is described which has a softer sealing portion and a relatively hard closure engaging portion. The cap is molded using two differing plastics where the container engaging portion is molded of a softer seal-forming plastic and the remaining portion or shell is molded of a harder plastic. The novel molding apparatus and method employ plunger or die movement to facilitate a successive molding of the soft and hard cap portions without changing the molding plunger or die.

REFERENCES:
patent: 1916692 (1933-07-01), Scribner
patent: 3031722 (1962-05-01), Gits
patent: 3281295 (1966-10-01), Capucio
patent: 3376608 (1968-04-01), Wilcox
patent: 4004868 (1977-01-01), Ohdate
patent: 4094460 (1978-06-01), Scanga et al.
patent: 4114775 (1978-09-01), Shinozaki
patent: 4269802 (1981-05-01), Linne
patent: 4385025 (1983-05-01), Salerno et al.

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