Method of forming tamper-evident container and closure by curlin

Details Method of forming tamper-evident container and closure by curlin Method of forming tamper-evident container and closure by curlin

1992-10-06

1994-02-08

Gorski, Joseph M.

Metal working

Method of mechanical manufacture

Assembling or joining

264295, 264296, B29D 1102

Patent

active

052839400

ABSTRACT:
A thin-walled, wide mouth molded plastic container is provided with a tamper evident band initially molded as a straight-walled cylinder spaced outwardly of the lip of the container and connected thereto by a frangible horizontal bridge. The upper edge of the cylindrical band extends above the level of the container lip. Subsequent to molding and preferably before capping, the band is curled inward by application of a curling tool. The container lid is axially applied, the outer edge of the lid displacing the curled band outward. The resilience of the band and bridge permits outward deflection and immediate restoration of the curl to its initial position. The curl prevents removal of the lid without fracture of the bridge and removal of the tamper-evident band.

REFERENCES:
patent: 2846831 (1958-08-01), Dobbins
patent: 4190175 (1980-02-01), Allen
patent: 4475274 (1984-10-01), Beckstrom et al.
patent: 4708255 (1987-11-01), Thompson
patent: 4709824 (1987-12-01), Thompson
patent: 4711364 (1987-12-01), Letica
patent: 4748735 (1988-06-01), Hayes
patent: 4793506 (1988-12-01), Thompson
patent: 4811857 (1989-03-01), Thompson
patent: 4823967 (1989-04-01), Thompson
patent: 4856667 (1989-08-01), Thompson
patent: 4872304 (1989-10-01), Thompson

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