Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1994-09-28
1999-11-09
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
425330, 425577, 249144, B29C 4537
Patent
active
059808110
ABSTRACT:
An improved method of molding a container finish for containers containing liquid at or above atmospheric pressures in which the frusto-conical sealing area thereof is formed in substantially unflawed condition. To accomplish this, the mold for the container includes the usual upper and lower members which move axially when the mold is opened, which members mate with a pair of side members which move laterally when the mold is opened. However, as contrasted with prior art molds of this type, the upper mold member is provided with an axially oriented cavity which encloses that portion of the neck finish which includes the sealing surface to a degree wherein the laterally extending parting line at the upper end of the side members is positioned below the lower edge of the frusto-conical sealing surface thus eliminating the presence of either axially oriented or transversely oriented parting lines on the sealing surface itself.
REFERENCES:
patent: 3556338 (1971-01-01), Wilkinson
patent: 3592349 (1971-07-01), Baugh
patent: 4201360 (1980-05-01), Schwartzburg et al.
patent: 4881891 (1989-11-01), Luther
patent: 5033777 (1991-07-01), Blenkush
patent: 5167898 (1992-12-01), Luther
patent: 5183615 (1993-02-01), Zushi
Heitbrink Jill L.
Temko Charles E.
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