Method of manufacturing stretched film, device for manufacturing stretched film and system for manufacturing stretched film
US9393736B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 2012 |
| Grant date | Jul 19, 2016 |
| Priority date | — |
| Expiry date | Mar 30, 2032 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2011/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A film (F) is transported with one end side in a width direction moved relatively in a preceding manner and the other end side moved relatively in a delayed manner and thus the film (F) is stretched in an oblique direction with respect to the width direction. In the individual positions of the film (F) in the width direction, the film (F) is asymmetrically heated in the width direction such that the amount of displacement (ΔL) of an orientation angle from a desired angle caused by bowing (Bo) asymmetrically produced in the width direction by the stretching of the film (F) in the oblique direction is reduced, and thus a maximum value in the temperature distribution of the film (F) is present between a center portion in the width direction and any one of end portions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.