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In the groundwood process, debarked logs are pressed against a rotating grindstone, which is simultaneously
cleaned and cooled by using shower water. Fibres and fibre fragments are torn
from the wood under intensive treatment from the grits of the stone. Refiner pulps are produced
in different types of disc refiners. In the refiner, wood chips are first disintegrated to fibres and
fibre fragments, these are subsequently worked in a narrow gap between two parallel patterned
refiner discs, either one or both of them are rotating.