Method for producing long stretched film
US9221207B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 8, 2012 |
| Grant date | Dec 29, 2015 |
| Priority date | — |
| Expiry date | Feb 8, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/3033
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for producing a long stretched film according to one aspect of the present invention includes at least a film forming step of forming a long film made of thermoplastic resin, an oblique stretching step of obliquely stretching the long film and a winding step of winding the long stretched film after the oblique stretching step. The oblique stretching device includes gripping tool travel support tools at opposite sides of the traveling long film. Each of the gripping tool travel support tools includes a plurality of gripping tools. In the oblique stretching device, the gripping tool travel support tools provided at the opposite sides of the long film include the same number of gripping tools. A combination of the gripping tools forming a gripping tool pair is constantly the same at grip start points where the long film is gripped by the gripping tools.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.