More Calendar Run-Out problems – Roll Water Passage
Most modern calender rolls are the drilled type. This means that water passages are drilled across the roll face under the surface. This effectively forms a radiator-like heat exchanger around the periphery of the roll. If these passages become plugged, then non-uniform heat transfer will occur and this results in a thermal ‘out-of-round’ condition for the roll or rolls. This has the same effect as if the rolls were... --more