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Unfortunately most production lines have experience with baling wire broken tile lost fasteners stones staples and other tramp material accidently infiltrating their stock preparation systems. These contaminants can cause significant damage to equipment such as refiners and approach flow cleaners ultimately leading to off-grade paper and unplanned downtime in addition to the inherent maintenance costs. Cleaner reFiner ProteCtion By Daniel Brouillette Global Business Manager Screening GLV Canada Inc. world pulppaper30 A low energy solution for cleaner and refiner protection Cleaner cone tips are an obvious place for these types of contaminants to gather plugging the rejects outlet and often causing spinning and premature wear. As cleaner banks generally consist of hundreds of cones a widespread contamination event can plug multiple components upsetting the system balance throughput and efficiency. To clean the system plugged cones must be manually removed cleared and replaced if necessary which obviously costs hours of unplanned downtime. Refiners are also susceptible to damage from these contaminants. Baling wires get caught up in the grooves between the bars in the refiner fillings disrupting the intended flow pattern and refining efficiency. In the worst cases larger and denser contaminants cause catastrophic failure of the refiner fillings resulting in downtime for a plate change and unfortunately also sending additional contaminants downstream in the process. Traditional solutions to protect against baling wire broken tile lost fasteners stones staples and other debris have been large high density cleaners and or trash screens. High density cleaners are simple and reasonably effective but suffer from frequent reliability maintenance and housekeeping issues. Trash screens are perhaps a better solution but carry a high initial a widespread contamination event can plug multiple components upsetting the system balance throughput and efficiency Figure 1. Plugged Cleaners Figure 2. Refiner filling damaged by baling wires Figure 3. Damage from a large contaminant entering the refiner