Patent · US Expired

Biaxially oriented film support for magnetic recording media

US6607822B2 · kind B2 · utility

0Cited by

6References

8Claims

0Family size

Assignee

Mitsubishi Polyester Film GmbH · US

Inventors

Ursula Murschall · Nierstein, DE
Andreas Stopp · Ingelheim am Rhein, DE
Guenther Crass · Taunusstein, DE
Harald Mueller · Taunusstein, DE

Key dates

Filing date	Mar 16, 2001
Grant date	Aug 19, 2003
Priority date	—
Expiry date	Mar 16, 2021

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31786
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

The present invention relates to an at least single-layer, biaxially oriented film support for magnetic recording media which is predominantly composed of crystallizable polyester, having a thickness in the range from 1 to 40 &mgr;m. The film has, over its total roll length and roll width and after it has been made up into customer rolls, an electrostatic charge build-up which is in the range from −80 kV/m to +80 kV/m, the contact pressure at the roll cutters during make-up being set in the range from 300 N/m to 350 N/m. The film is drawn between electrical discharge means, which are arranged close to the roll, along the film path in the make-up machine, and is particularly suitable for high-quality audio, video or computer tapes and for floppy disks or thermal tapes.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.