Refining is one of the critical process steps in engineering the structure of paper and board as it has a major influence on fiber quality. Refining mechanically alters the fibers by brushing, hydrating, and cutting them. This course will describe low consistency refining as well as refining actions as they relate to double disc refiners. It also discusses the different refiner types, key components of a double disc refiner, typical control strategies, and the effects of refining on sheet properties.
•Describe the effects of refining on wood fibers
•Identify safety hazards and safety guidelines associated with refiners
•State the objectives of refining
•Identify the different refiner types
•Identify and describe the key components of a refiner
•Describe the operation of refiners
•List the typical control strategies
•Identify the effects of refining on sheet properties
•Explain the effects of over-refining
