Patent classifications
D
TEXTILES; PAPER
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D21
PAPER-MAKING; PRODUCTION OF CELLULOSE
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D21H
PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
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23/00
Processes or apparatus for adding material to the pulp or to the paper
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D21H23/02
characterised by the manner in which substances are added
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D21H23/04
Addition to the pulp; After-treatment of added substances in the pulp
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