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Calendering is a finishing process used to provide extra smoothness or gloss to the paper product by rolling. Supercalendering is similar, but usually takes place off-line and uses softer rollers. The quality of the surface finish varies according to paper type and pressure exerted.

The supercalender is a stack of alternate steel and fiber-covered rolls which add density, smoothness and gloss to paper. Rolls for un-coated paper are usually made of chilled cast iron and highly compressed paper, while rolls for coated paper consist of chilled cast iron and highly compressed cotton.

Since the purpose of supercalendering is to introduce a smoother surface finish to the roll, surface inspection is critical. Manual inspection is difficult given the speed of the process and proximity of dangerous machinery, so an automated, non-contact solution is required.
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