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 increases. Good practice is to open the calender at least 100 mils (0.10”) before starting to increase the roll temperature above ambient. Keeping the calender rolls turning during warm-up and cool down also eliminates the possibility of warping the rolls.
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