Controlling the addition

Full Title

Processes or apparatus for adding material to the pulp or to the paper (applying liquids or other fluent material to surfaces, in general B05; processes for making continuous lengths of paper D21F11/00) > characterised by the manner in which substances are added > Addition to the pulp; After-treatment of added substances in the pulp > Controlling the addition

Child Classifications

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• D21H 23/08 by measuring pulp properties, e.g. zeta potential, pH
• D21H 23/12 by measuring properties of the formed web
• D21H 23/14 by selecting point of addition or time of contact between components