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The mechanisms of fiber loss in flotation deinking were studied using fibers with the same geometry but different surface hydrophobicities. The fiber loss was directly compared with the contact angle of fibers in the pulp suspensions. It was found that both true flotation and physical entrainment will contribute to the fiber loss, but physical entrainment is the major contributor. Fiber geometry and froth structure will significantly affect the physical entrainment. Only part of the entrained fibers can be washed away from the froth during water drainage. To reduce fiber loss in flotation deinking, effective control of foam structure and stability is very important.

True flotation and physical entrainment: The mechanisms of fiber loss in flotation heinking