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Roll screens allow the separation of chip fines with a controlled thickness. Acceptable chips are carried over the top of the rolls and the fines (thin) chips are discharged below.
Roll screens allow the separation of thick chips with a controlled thickness. Acceptable chips (thickness) are discharged below and over thick chips are carried over the top of the rolls.
Shaker screens have decks of screens with different size openings in each deck to screen out overs, accepts and fines. Thickness screens are typically rotary with a series of rolls with spaces between them set to represent maximum chip thickness. Fines screens are designed to screen out chips that are too thin (fines). A typical fines screen would consist of a series of rolls with spaces between them set to represent unacceptable thin chips.
