Hotseal jaws and cutoff knife assembly for processing thermoplastic film bag making material
US5015223A · kind A · utility
33Cited by
8References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 6, 1989 |
| Grant date | May 14, 1991 |
| Priority date | — |
| Expiry date | Dec 6, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/7128
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Thermoplastic film bag making material is processed between a hotseal jaw and cutoff knife assembly. The apparatus has complementary first and second jaws between which the material is received for sealing bag side edge areas of the bag making material. The first jaw has a groove and the second jaw has a cutoff knife for extension into the groove for separating the material into individual bags. A rubber anvil block is in a groove underlying a zipper of the bag material and the knife thrusts into the block and attains substantially straight edges in the bag cutoff. Improved end sealing of the zipper also results.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.