Many paper mills worldwide are using the deinking process to produce pulp for the manufacture of various types of paper and board. To design a new deinking line properly or to modify and optimize existing lines, as is often required, operating conditions, quality targets, investment costs and system operations have to be considered. These parameters include end product quality, recycled pulp ... [Show full abstract] production costs, and capital cost. In accordance with these basic requirements, Comer, Italy, has selected three process stages which will allow a precise and well outlined evaluation to be successful in the development of new equipment and the optimization of existing technology. The process stages are pulping, screening and flotation.