Cross-Directional Surface Roughness Profiling in Paper Calendering

The patent applies local quality by creating a cross-directional roughness profile on the thermo-roll surface where different regions have different roughness values. The roll surface is divided into zones with varying Ra values, allowing local optimization of both smoothness and gloss properties in different cross-machine direction regions, thus resolving the contradiction between overall smoothness improvement and gloss degradation.

The patent replaces conventional mechanical grinding methods with laser-based surface treatment. The laser processing system eliminates mechanical contact and associated grinding errors, enabling precise control of surface roughness profile without the tolerance limitations of mechanical grinding systems. This substitution achieves the desired surface profiles with higher precision.

The patent uses local quality by implementing a cross-directional roughness profile on the calender roll surface, where different regions have optimized roughness values. This allows achieving high smoothness in specific zones without uniformly increasing line load or temperature across the entire web, thereby reducing web damage risk while maintaining energy efficiency.

The patent implements local quality through a cross-directional roughness profile on the calender roll, enabling different regions to operate at optimized roughness levels. This eliminates the need to uniformly increase line load or temperature across the entire web to achieve desired smoothness, thereby reducing overall energy consumption while maintaining calendering effectiveness.