Magnetic Tape Back Coating Surface Roughness Control

The invention changes the surface roughness parameter of the back coating layer to a specific range (3.0 nm to 7.0 nm Ra) that balances two opposing requirements: smooth enough to prevent set-off and drop-out, but with sufficient micro-roughness to maintain running stability under temperature and humidity changes. This parameter optimization resolves the contradiction by finding the optimal value that satisfies both conditions.

The invention optimizes the surface roughness parameter within a specific range (3.0 nm to 7.0 nm Ra) to simultaneously achieve low error rates and high adaptability to environmental changes. The micro-roughness within this range provides sufficient friction and adhesion for stable running under varying temperature and humidity, while maintaining smoothness enough to prevent set-off and reduce errors.

The invention finds the optimal surface roughness parameter range (3.0 nm to 7.0 nm Ra) that balances moisture resistance and running stability under high humidity. The micro-roughness provides capillary effects and adhesion that maintain stable running, while the overall smoothness prevents excessive moisture attachment that would cause signal quality deterioration.