Plastics bags production
US4300892A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 17, 1979 |
| Grant date | Nov 17, 1981 |
| Priority date | — |
| Expiry date | Sep 17, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S493/929
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
In the production of plastics bags, especially valved bags, from a web of plastics material by folding in the side margins of the web to form overlapping panels which are then longitudinally heat-sealed together for a major portion of one bag length, and then heat-sealing the web transversely and severing the web at intervals to produce individual bags, the two overlapping panels are heat-sealed together by forming two longitudinal seals which partially overlap to provide a forward longitudinal seal and a rear longitudinal seal with respect to the direction of travel of the web, the rear longitudinal seal of each bag being formed simultaneously with the forward longitudinal seal of the adjacent following bag. The apparatus comprises a pair of heat-sealing elements equipped for simultaneous operation and arranged for forming the rear seal in one bag and the forward seal in the following adjacent bag. The two elements may be a fixed distance apart, and at least one has suitably a hairpin shape.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.