Container closure system with inner seal in cap
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United States of America Patent
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-
Aug 21, 2001
Grant Date -
N/A
app pub date -
Nov 9, 1998
filing date -
Nov 10, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A container mouth (21) is sealed with an inner seal which comprises a reseal liner (9) fitted inside of a cap (23) and a seal cover (10) separably laminated to the reseal liner and remaining on the container mouth after the container (20) is uncapped. The seal cover comprises a metal foil (5), a glassine paper (7) layered on the underside of the metal foil, and a hot-melt adhesive layer (8) coated on the underside of the glassine paper by gravure roll coating process. A polyethlene film (6) is preferably layered between the metal foil and the glassine paper to provide a better peel-off strength therebetween. The glassine paper may be replaced with an easy-peelable plastic film, such as a PET (polyethlene terephthalate resin) film. The inner seal fitted in the cap is placed onto the container mouth, and then the cap is subjected to a high frequency of 20-600 KHz to melt the hot-melt adhesive layer, whereby the seal cover hermetically seals the container mouth. The seal cover separates from the reseal liner when the container is first decapped, and is relatively easy to be peeled off to open the container mouth.
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