The papermaker is faced with many challenges when trying to keep fabrics and roll covers clean. Contaminants are deposited and consequently forced into the void volume of fabrics, reducing permeability, creating holes in the sheet, and other runnability issues. In addition, deposits on roll surfaces cause picking or sheet marking.
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Written by Steve Fielding
on May 06, 2015.
A newly installed steam injection water heater with a ½” vacuum breaker was experiencing sporadic periods where the vacuum breaker chattered rapidly and “spit out” condensate. Once the water heater reached its set point, the chattering stopped and did not reappear for hours. Chatter will eventually destroy the cage that holds the spring and ball-check in place on the vacuum breaker.
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Written by Jan Walter
on April 16, 2015.
Vacuum breakers are frequently installed with the air inlet port facing up. This orientation can lead to contaminants entering the steam system and potentially accumulating on the ball, seat, and cage area of the vacuum breaker.
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Written by Al Ives
on March 17, 2015.
For years, papermakers have looked for the best combination of drainage and formation in the early section of fourdrinier paper machines. The ability to maximize drainage without sealing the sheet and to control sheet activity over a wide range of basis weights have been challenges with increasing machine speeds and customer quality demands.
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Written by Charles Pound
on January 13, 2015.
Pressure filters are used extensively in the papermaking process and often go unnoticed as they effortlessly operate in stable mill water systems. They quietly perform as designed preventing shower nozzles from plugging and assuring that paper machine clothing remains clean. Pressure filters protect process equipment by removing contaminants such as sand and silt from mill water.
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Written by Dave McGowan
on December 16, 2014.