Easily-openable heat seal lid
US4428494A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 18, 1982 |
| Grant date | Jan 31, 1984 |
| Priority date | — |
| Expiry date | Oct 18, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D17/4011
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
Disclosed is an easily openable heat seal lid for sealing a vessel proper by forming a heat-sealed portion between the lid and the vessel proper, which comprises a laminate comprising at least an inner face member composed of a thermoplastic resin and a metal foil, wherein scores defining a portion to be opened are formed on the side inner than the portion to be heat-sealed so that the scores extend to the midway of the thickness direction of the metal foil, an opening tab is formed on the portion of the lid to be opened through a bonding fulcrum portion composed of a thermoplastic resin hot adhesive so that the push-tearing top end of the opening tab is located on the scores, and the peel strength between the opening tab and the lid in said bonding portion is at least 0.4 Kg/5 mm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.