D
SECTION D — TEXTILES
;
PAPER
PAPER
D21
PAPER-MAKING
;
PRODUCTION OF CELLULOSE
D21D
TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
[5]
P:0
D21D 1/00
Methods of beating or refining
;
Beaters of the Hollander type
(knotter screens
Fulltext...
Hierarchy...
Expanded...
D21F
)
P:10
D21D 5/00
Purification of the pulp suspension by mechanical means
;
Apparatus therefor
(centrifuges, cyclones
Fulltext...
Hierarchy...
Expanded...
B04
)
P:20
D21D 99/00
Subject matter not provided for in other groups of this subclass
[8]