Surface Characterization
The measurement and analysis of surface topography and micro-roughness profile determine the texture of paper and paperboard coatings. Utilizing modern profilometry allows paper mills to evaluate how a substrate will interact with printing inks, adhesives, and barrier laminates. This analysis is crucial for ensuring a smooth surface that supports high-resolution graphics and uniform coating application.
Measurement Technology
Instruments used for this task can be split into contact systems that use a delicate diamond-tipped stylus and non-contact systems that use optical lasers. Optical methods are preferred for soft coatings because they do not scratch or deform the surface during the measurement process. Both techniques generate detailed height profiles that reveal surface peaks, valleys, and textures.
Application Value
Controlling surface roughness is key to preventing defects like ink mottle or incomplete barrier coverage on packaging boards. Through high-precision profilometry, converters can measure the micro-cavities on the board surface that might absorb too much ink or cause uneven coating thickness. This data enables operators to adjust the calender rolls or coating blades to achieve the desired finish before the material is shipped.
Implementing this quality control step reduces raw material waste and ensures consistent print results across different production batches.
