초록 ▼

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

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.

대표청구항 ▼

A tamper evident container comprising a hollow body portion, a neck portion at one end of the hollow body portion defining the only outlet for the hollow body portion, and a sealing member formed integrally with the neck portion and extending completely across said outlet to seal the container, but

A tamper evident container comprising a hollow body portion, a neck portion at one end of the hollow body portion defining the only outlet for the hollow body portion, and a sealing member formed integrally with the neck portion and extending completely across said outlet to seal the container, but with adjacent portions of said sealing member and neck portion defining a separation line at their interface which is thinner and structurally weaker than both said neck portion and sealing member, said sealing member also defining gripping means by which a force may be applied to said sealing member to tear the sealing member from the neck portion along said separation line, said adjacent portions of the sealing member and neck portion being integrally formed of a thermoplastic material containing an anhydrous solid particulate inorganic material with an average particle size of 10 microns or less in an amount of about three to sixteen percent by weight to make the thermoplastic material brittle enough that said tear is confined to said separation line.