Packing container with openable seal-weakened top closure
US4775096A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 1987 |
| Grant date | Oct 4, 1988 |
| Priority date | — |
| Expiry date | Nov 19, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31971
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A packing container (2) includes a container body consisting of side walls (3,4), an arbitrary bottom closure (5), and a top closed by a bellow-type folded and heat sealed closure so as to form a top closure of the gable-top type which can be unfolded to expose an emptying opening (25) in the form of a pouring spout. To facilitate this re-unfolding, certain portions of the surfaces which are heat-sealed to one another are coated within the area of the unfoldable part of the top closure with a seal-weakening composition which is based on an aqueous dispersion of a thermoplastics material, preferably polythene, which is modified by a carboxymethyl cellulose, preferably sodium carboxymethyl cellulose.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.