Easily openable vessel closure and process for preparation thereof
US4397401A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 2, 1982 |
| Grant date | Aug 9, 1983 |
| Priority date | — |
| Expiry date | Mar 2, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D2517/5083
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Disclosed is an easily openable vessel closure comprising a can end member having a preformed opening, an easily peelable opening piece which is applied to the outer side of the can end member so that the opening piece covers said opening and adheres closely to the peripheral portion of said opening, and a protecting covering layer formed to cover the cut edge of the opening of the can end member, wherein the protecting covering layer is formed of a thermoplastic resin having a heat bondability and the protecting covering layer includes a film layer heat-bonded to the inner and outer peripheral portions of the opening and a projecting cover heat-bonded to the cut edge of the opening integrally with said film layer, and said opening piece is heat-bonded to the can end member through the protecting covering layer located outside the can end member and said protecting covering layer is stuck closely to the cut edge of the opening so that when the opening piece is peeled, the protecting covering layer is left on the side of the can end member. This vessel closure is excellent in the seal reliability, corrosion resistance, flavor-retaining property and easy openability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.