Contract n° BOS-013-D
Stickies derive from undesirable waste paper components that have entered the treated waste paper pulp. These stickies are found to occur in the form of small particles or they have gone into colloidal or molecular dissolution. Substances of this kind are of particular interest, since they cannot be eliminated with modern mechanical cleaning elements at the pulping stage. Forming part of the accept, stickies tend to cause production failures and quality losses. The paper discusses five different mechanisms of how stickies agglomerate from particles or dissolved substances. These formation mechanisms require certain process engineering conditions which in turn are influenced by characteristic changes in the composition of waste papers that have been observed in recent years. The findings suggest a few possibilities of stickies control.
KeywordsWaste Paper Production Failure Mechanical Cleaning Hydrophobic Particle Aluminium Sulphate
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