Key characteristics of a platen sealing tool should be good flatness and the appropriate knurl. Use pressure-sensitive tape to assure planarity of the tool.
Dirt or residues from over-lacquers, inks, and paper particles can build up, absorb heat, distort the knurl pattern, and lead to an uneven seal.
Belt manufacturers, too, discourage knurled pulleys because they invariably abrade the belt's underside and resist tracking, which leads to a substantial reduction in belt life.
Or disassembling and checking bearings during a belt change or cleaning knurled pulleys?
It took a few tries to arrive at the right knurl
Pre-forming dimensions are purposely made smaller than the required finished size to accommodate the outward displacement or material flow generated by the penetration of knurl teeth into the part.
Once such parts are assembled, the knurled area is often hidden from view.
The gripping-type knurl application is the most common.
All too often, the "mind set" is to roll form whenever a print calls out a knurl pattern.
The manufacturing volume of such tools or parts is generally low and the performance of the knurl is critical.