Film blowing apparatus
US5122329A · kind A · utility
5Cited by
8References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 22, 1991 |
| Grant date | Jun 16, 1992 |
| Priority date | — |
| Expiry date | Mar 22, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/912
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A film blowing apparatus for the production of blown polymeric films includes a modified air ring which includes means for the continuous or periodic collection and removal of liquids from the proximity of the circular die which may condense, and further, optionally includes the further step of providing means, preferably a vacuum pump, for withdrawing and optionally collecting the condensed liquids from the surface of the modified air ring facing the blown film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.