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Language: English French Portuguese Russian Spanish
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Stock Preparation Series (Details)Includes 5 courses for $299/year. Paper Library (Details)Includes 95 courses for $1,499/year.
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Training Time: 26 minutes
Compatibility: Desktop, Tablet, Phone
Based on: Industry Standards and Best Practices
Languages: English, Portuguese, French, Russian, Spanish
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.
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The following key questions are answered in this module:
What is the purpose of paper and board machine refining?The main purpose of most paper and board machine refining is to improve certain sheet properties, including strength and density-related properties.
What happens to the fibers during refining?The fiber cell walls are delaminated, allowing them to absorb more water and increasing their flexibility. External fibrillation of the fiber surfaces increases the surface area available for bonding, and some fiber cutting and creation of fines takes place.
Why is it important to keep the flow rate through a refiner steady?Flow rate determines the amount of time the fibers are available for treatment in the refiner. Low flow can lead to fiber cutting, fiber channeling in the plate grooves, and poor strength development. High flow can cause plugging and poor fiber development.
Why do broke fibers and recycled fibers not respond as well to refining?Broke and recycled fibers have already been refined and contain some shorter fibers, which don't respond as well to refining. Also, they have been previously dried, so don't absorb water as readily, making them more difficult to refine.
Below is a transcript of the video sample provided for this module:
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