PRODUCTION OF MAGNETIC RECORDING MEDIUM

摘要

PURPOSE:To obtain the titled magnetic recording medium having stabilized magnetic characteristics and form by treating a substrate with glow discharge immediately before the substrate begins to contact a preheating roller when a metallic thin film magnetic layer is formed by vapor deposition. CONSTITUTION:A substrate 1 of a high molecular material is treated with glow discharge by a glow discharge electrode 8 immediately before the substrate begins to contact a preheating roller 3. The glow discharge electrode 8 is arranged so that the glow discharge is exerted on the part of the substrate 1 which begins to contact the preheating roller 3. The surface conditions of the substrate 1 are made uniform by the passage of the substrate 1 through a gas under the influence of the glow discharge and the electrification of the substrate 1 is removed. Consequently, the sticking of the substrate 1 on a can 2 is made uniform, a magnetic recording medium without any creases and having uniform characteristics can be obtained. Ar or N2 is preferably used as the gas to be introduced into a vacuum vessel in consideration of its stability.