Closure cap with a seal and method of and apparatus for forming

Details Closure cap with a seal and method of and apparatus for forming Closure cap with a seal and method of and apparatus for forming

1987-06-10

1988-12-27

Norton, Donald F.

Bottles and jars

Closures

Cap type

215DIG1, 264295, 264296, B65D 5300

Patent

active

047935065

ABSTRACT:
In combination, a container and a linerless cap and a method of forming the cap. The cap includes plastic and has a sealing surface which is softer than contiguous plastic portions as a result of its method of forming which includes stretching. In the method the cap is molded from plastic and includes a top wall, an outer depending skirt and an internal depending substantially annular wall having an upper end integral with and depending from the top wall and a lower free end. Thereafter the free end is engaged by a forming tool to progressively turn the free end away from the internal wall to create a stretched intermediate portion for sealing which is softer than its contiguous portions.

REFERENCES:
patent: 3038624 (1962-06-01), Wieckmann
patent: 3200981 (1965-08-01), Harding
patent: 3418409 (1968-12-01), Hesse et al.
patent: 4016996 (1977-04-01), Aichinger et al.
patent: 4281979 (1981-08-01), Doherty et al.
patent: 4386044 (1983-05-01), Arndt et al.
patent: 4475274 (1984-10-01), Beckstrom
patent: 4595547 (1986-06-01), Herr

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