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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D21H23/22
Addition to the formed paper
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D21H23/24
during paper manufacture
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D21H23/26
by selecting point of addition or moisture content of the paper
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D21H23/28
Addition before the dryer section, e.g. at the wet end or press section
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