D
SECTION D — TEXTILES AND PAPER
PAPER
D21
PAPER-MAKING
;
PRODUCTION OF CELLULOSE
D21B
FIBROUS RAW MATERIALS AND THEIR MECHANICAL TREATMENT
D21B 1/00
Fibrous raw materials and their mechanical treatment
D21B 1/02
·
Pretreatment of the raw materials by physical or chemical means
(removal of bark
Fulltext...
Hierarchy...
Expanded...
B27L
)
D21B 1/04
·
by dividing raw materials into small particles, e.g. fibres
(breaking-up or cutting wood or the like by dry methods
Fulltext...
Hierarchy...
Expanded...
B27L
; disintegrating peat
Fulltext...
Hierarchy...
Expanded...
C10F 7/02
; obtaining fibres mechanically for spinning from rags, peat, or the like
Fulltext...
Hierarchy...
Expanded...
D01B
)
D21B 1/06
· ·
by dry methods
D21B 1/08
· · ·
the raw material being waste paper
(chemical part
Fulltext...
Hierarchy...
Expanded...
D21C 5/02
)
;
the raw material being rags
D21B 1/10
· · · ·
by cutting actions
D21B 1/12
· ·
by wet methods, by the use of steam
(beaters
Fulltext...
Hierarchy...
Expanded...
D21D 1/00
)
D21B 1/14
· · ·
Disintegrating in mills
(in general
Fulltext...
Hierarchy...
Expanded...
B02C
)
D21B 1/16
· · · ·
in the presence of chemical agents
D21B 1/18
· · · ·
in magazine-type machines
D21B 1/20
· · · · ·
with chain feed
D21B 1/22
· · · · ·
with screw feed
D21B 1/24
· · · · ·
of the pocket type
D21B 1/26
· · · ·
Driving or feeding arrangements
D21B 1/28
· · · ·
Dressers for mill stones, combined with the mill
D21B 1/30
· · ·
Defibrating by other means
D21B 1/32
· · · ·
of waste paper
D21B 1/34
· · · ·
Kneading or mixing
;
Pulpers
D21B 1/36
· · · ·
Explosive disintegration by sudden pressure reduction
D21B 1/38
·
Conserving the finely-divided cellulosic material