Electrostatic pinning of extruded polyamide film
US4268464A · kind A · utility
11Cited by
5References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 16, 1979 |
| Grant date | May 19, 1981 |
| Priority date | — |
| Expiry date | Aug 16, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/07
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for production of a sheet of a polyamide material which comprises extruding the polyamide material in a melt state in the form of sheet and bringing the extruded sheet in a melt state into contact with the surface of a moving chill body for quenching to give an undrawn film, characterized in that a direct current of high voltage is applied between an electrode and the extruded sheet so as to product a discharge in a streamer corona state onto the extruded sheet, whereby the extruded sheet is brought into tight and close contact with the surface of the moving chill body electrically grounded so as to be chilled quickly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.