Process for producing a magnetic recording medium having an improved dimensional stability

摘要

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/cm2 to 1 kg/cm2 at a temperature of 50 DEG C. to 150 DEG C. for a period of time of 15 seconds to 24 hours. The heat treating process avoids conventional problems with respect to thermal shrinkage.