Container with twist-off tamper evident feature

Details Container with twist-off tamper evident feature Container with twist-off tamper evident feature

1985-08-23

1987-05-19

Werner, Frank E.

Dispensing

Collapsible wall-type container

Nonmetallic

215250, 215253, 220258, 220266, 222153, 222541, 524427, 524448, B65D 4710, B65D 3508

Patent

active

046660631

ABSTRACT:
An integral seal member is formed across the outlet in the neck of a tamper evident, thermoplastic container by adding to the thermoplastic material such as polyethylene, 3% to 16%, and preferably about 8% by weight, of an anhydrous solid inorganic particulate additive such as an anhydrous siliceous material or calcium carbonate so that the material becomes brittle enough that the seal member tears cleanly from the neck within the confines of an undercut at the interface between the seal member and neck. Torque is applied to the seal member by providing in the top of a conventional screw cap which forms a resealing closure for the container once opened, a recess with serrations which, when the cap is removed and turned upside down, engage serrations on the peripheral edge of the seal.

REFERENCES:
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patent: 3156383 (1964-11-01), Melli
patent: 3162339 (1964-12-01), Lecluyse
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patent: 3993223 (1976-11-01), Welker, III et al.
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patent: 4104289 (1978-08-01), Jones
patent: 4125514 (1978-11-01), Stabler
patent: 4157765 (1979-06-01), Golebiewsky
patent: 4407986 (1983-10-01), Nomura et al.
patent: 4533602 (1985-08-01), Nakamura et al.
patent: 4560712 (1985-12-01), Chiang

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