Spinning method and apparatus
US4105728A · kind A · utility
3Cited by
2References
42Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 22, 1976 |
| Grant date | Aug 8, 1978 |
| Priority date | — |
| Expiry date | Sep 22, 1996 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/0018
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Films are formed from liquid polymeric material passed through an elongate exit slit of a die and drawn to a solidification region. A condition of flow of liquid through the slit is established to enforce a controlled ratio of extensional strain rate to shear strain rate on the material leaving the slit by providing a predetermined slit profile to maintain that ratio above a minimum throughout the width of the film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.