Oriented film producing facility with thickness and orientation control means
US6190153A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Apr 30, 1998 |
| Grant date | Feb 20, 2001 |
| Priority date | — |
| Expiry date | Apr 30, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2948/92933
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A drawing system in which a thickness and degree of orientation of an oriented film or the like is maintained in a uniform manner under a condition of a high speed, shortened is a time required from a time when a molding material is charged in an extruder and drawing started until a time when a film is taken up on a take-up apparatus, and a high quality film or the like is produced at a high speed and besides, a probability for a not-oriented or oriented film or the like to be broken down during drawing is reduced. A thickness and degree of orientation of a film are independently measured in thickness gauges and a film orientation measuring apparatus in a continuous manner after longitudinal drawing or lateral drawing and measured values are input to a computer. The computer input with the measured values respectively compares preset target values with the measured thickness and degree of orientation and a control operation to change a longitudinal draw ratio is conducted if the measured values are different from respective preset values based on results of comparison processing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.