Method of and device for controlling and automatically controlling the thickness profile in the production of blown film
US6783344B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 7, 2000 |
| Grant date | Aug 31, 2004 |
| Priority date | — |
| Expiry date | Jan 17, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2948/92923
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A device for controlling thickness of film in a blown film extruder has a blow head, a main cooling ring and an additional cooling ring. The additional cooling ring supplies separate additional air streams. A measuring and controlling device controls the thickness profile of a blown film. The measuring and controlling device scans the thickness of the blown film above a freezing zone. The device controls the additional air streams as a function of the measured blown film thicknesses. The additional cooling ring is a segmented ring arranged at the blow head of a blown film extruder adjacent the main cooling ring. A method utilizing device is likewise disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.