Active Dryer Control For Sheet Break Recovery, 2008 PAPERCON Conference

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Lost time and cull losses around sheet breaks can be responsible for a 2% to 4% reduction in overall efficiency on many paper machines. It is not unusual to have four to six sheet breaks per day on a high speed, light weight machine. Heavier weight board machine may have less than one break per day. Sheet break times can average from 10 minutes, on a machine with good sheet break recovery procedures, to over 60 minutes. It is highly desirable to reduce the lost production by rapidly returning back to first quality production quickly. Dryer temperature is one of the more critical variables in determining how easily and quickly a machine recovers from a sheet break.