Film extrusion method
US3979497A · kind A · utility
0Cited by
5References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 14, 1974 |
| Grant date | Sep 7, 1976 |
| Priority date | — |
| Expiry date | Jan 14, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/15
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for making a film in which bead formation along opposite longitudinal edges thereof is at least minimized by extruding into a setting bath a generally flat stream of coagulable solution with the longitudinal edges of such stream each having a concave contour and being free to deform into a rounded contour under the influence of the interfacial surface tension forces acting upon the extruded stream of coagulable solution during the setting thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.