Heat sealed carton
US5230204A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 31, 1991 |
| Grant date | Jul 27, 1993 |
| Priority date | — |
| Expiry date | Dec 31, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB31B50/642
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A gable-top carton has a pair of panels (4, 6) which form sloping walls and have marginal portions (4m, 6m). Another pair of panels (3m, 5m), are tucked beneath the sloping walls and have marginal portions (3m, 5m). The marginal portions (3m-6m) are heat sealed together to form a ridge-shaped seal. One panel (5) is the pouring spout panel and this is revealed when wings (9, 10), on the sealed carton are folded back. The pouring spout panel (5) is secured by a bond (34) made in a central folded corner (26), a bond (35, 36) between outer corners of the wings (9, 10), and a bond between confronting surfaces of the marginal portions 4m, 6 m). Areas on the marginal portions (4m, 6 m) are not directly heated to facilitate opening of the pouring spout whilst providing an hermetic seal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.