Conveyor rollers with rubber coatings enable more friction between the roller and the driving belt.
Both rubber and polyurethane rollers are available in three different hardnesses (durometer = hardness). The standard for most inking applications is 30 durometer (considered medium durometer) for lithography, relief and monoprinting. For tack printing, a set of three rollers are typically used; 15 (considered the softest), 30 and 50 (considered the hardest) durometers.
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