Process for preparing polyamide film
US5000889A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 6, 1990 |
| Grant date | Mar 19, 1991 |
| Priority date | — |
| Expiry date | Mar 6, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C55/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for preparing a polyamide type film which comprises melt-extruding a polyamide resin having a metal compound and a melt specific resistance of not more than 1.5.times.10.sup.5 .OMEGA.cm at 260.degree. C. in a form of a film, contacting the melt-extruded film closely with a revolving cooling drum through static electricity and taking up the film while cooling rapidly to solidify, which provides remarkable improved adhesion by static electricity. As a result, increasing the take-up rate of the revolving cooling drum does not cause trapping of air between the drum and the film so that a film having excellent uniformity in thickness and transparency can be produced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.