Calender Barring Review with Experiences, 2021 TAPPICon Live (21TAPL)
Calender barring is a problem that can affect many styles of calender stacks. It has been present in multi-nip and single nip stacks, with hard and soft rolls. Calender vibration can be separated into forced vibration and self-excited vibration. The forced vibration occurs at the first few harmonics of the calender roll rotational speeds. The self-excited vibration that occurs at higher frequencies is defined as calender barring.
The feedback path for the self-excitation mechanism must be understood in order to ameliorate the problem. This paper reviews the types of self-excited feedback mechanisms and techniques to control the resulting vibration. A variety of experiences with barring issues are given to help in recognizing barring and the effect of remedial actions.
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