Preheater for heat-sealing system for plastic containers
US4856989A · kind A · utility
23Cited by
9References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 25, 1988 |
| Grant date | Aug 15, 1989 |
| Priority date | — |
| Expiry date | Jul 25, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB31B50/64
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A preheater assembly for softening a selected portion of plastic stock material prior to severing and edge sealing is disclosed. The preheater assembly includes a pair of opposed preheaters, each having a heater tip connected to a source of heated air. The air flows through the tip to maintain it at a preselected temperature. The preheaters are mounted on opposite sides of the stock material for motion toward the material to engage it on opposite sides to heat and soften it, and away from the material to release it. Clamp elements engage the stock material during the heating and softening process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.