Control of tubular film size
US4402656A · kind A · utility
21Cited by
14References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 3, 1981 |
| Grant date | Sep 6, 1983 |
| Priority date | — |
| Expiry date | Apr 3, 2001 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2948/92923
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An internally-cooled blown-film system, for producing plastic tubing, in which the flow rate of the continuous flow of internal cooling air, by non-contacting, energy beam sensor means, is made directly dependent upon the deviation in position of the tube wall.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.