Process for producing a magnetic recording medium having an improved dimensional stability
US4661377A · kind A · utility
5Cited by
3References
30Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 11, 1984 |
| Grant date | Apr 28, 1987 |
| Priority date | — |
| Expiry date | Jan 11, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/84
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A heat-treating process is disclosed. The process involves cutting a polymer support for a recording medium from a web roll of a long support base into a sheet form. The sheet or sheets in a superposed state are then heat-treated while applying pressure in the range of 1 g/cm.sup.2 to 1 kg/cm.sup.2 at a temperature of 50.degree. C. to 150.degree. C. for a period of time of 15 seconds to 24 hours. The heat treating process avoids conventional problems with respect to thermal shrinkage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.