Rotary film sealing and severing head for thermoplastics
US4909016A · kind A · utility
15Cited by
11References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 4, 1989 |
| Grant date | Mar 20, 1990 |
| Priority date | — |
| Expiry date | Jan 4, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C66/961
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A rotary film sealing and severing device for use with thermoplastic film for forming packages. The device includes a rotating anvil assembly and a counter-rotating film cutting assembly having a heated sealing and cutting knife. First and second liquid cooled clamping bars on either side of the knife hold the layers of film together while the film is being sealed and cut. Cooling the clamping bars prevents the film from adhering to the clamps and causes the layers of film to quickly fuse together and allows high speed operation by preventing separation of layers of film due to slow cooling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.