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Calender Rolls Seem to be Erratic? Check for Roll Eccentricity!
Calender rolls must be round and free of run-out at ambient temperature. Any run-out of the individual calender rolls will be amplified as the high spots and low spots periodically match up between the...
View ArticleCalender Roll Surface Run-Out may actually be the bearings
Calender roll bearing smay have excessive run-out. The result is the same as, and will appear as calender roll surface run-out. Excessive bearing clearance will result in the roll shifting during...
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More Calender 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...
View ArticleKeep your Calender Running During Warm-Up and Cool Down
Severe thermal run-out can be introduced during warm-up of the calender if it is not kept running. Remember that the calender gap will be reduced as the rolls grow (get larger) as their temperature...
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