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Outline
Indent Level
Color Curly Brackets (indicating CPC extensions to IPC) References Date Revised

CPC
COOPERATIVE PATENT CLASSIFICATION
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PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
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Wet end of machines for making continuous webs of paper
.
{
Regulating the freeness of the pulp
}
.
{
Devices for dispensing fibres in a fluid
}
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.
{
Screen-cloths
}
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D21F 1/0036
. .
{
Multi-layer screen-cloths
}
. . .
{
Triple layer fabrics
}
D21F 1/0054
. .
{
Seams thereof
}
D21F 1/0063
. .
{
Perforated sheets
}
D21F 1/0072
. .
{
Link belts
}
D21F 1/0081
. .
{
with single endless strands travelling in generally parallel convolutions
}
.
{
Fibre-rearranging devices
}
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.
Head boxes of Fourdrinier machines
. .
{
Means for injecting material into flow within the headbox
}
D21F 1/024
. .
{
Details of the feed chamber
}
D21F 1/026
. .
{
Details of the turbulence section
}
D21F 1/028
. .
{
Details of the nozzle section
}
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D21F 1/04
.
Head boxes of cylinder machines
D21F 1/043
. .
{
with immersed cylinders
}
D21F 1/046
. .
{
with non-immersed cylinder
}
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.
Regulating pulp flow
D21F 1/065
. .
{
Shock-absorbing devices
}
.
Regulating consistency
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.
Wire-cloths (production of wire-cloths B21F)
D21F 1/105
. .
{
Multi-layer wire-cloths
}
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D21F 1/12
. .
Seams thereof
D21F 1/14
. . .
welded
D21F 1/16
. . .
sewn
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.
Shaking apparatus for wire-cloths and associated parts
. .
in fourdrinier machines
. .
in cylinder machines
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.
Tilting, raising, or lowering mechanisms for wire-cloths
. .
in Fourdrinier machines
. .
in cylinder machines
.
Protecting wire-cloths from mechanical damage
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.
Washing wire-cloths or felts
D21F 1/325
. .
{
with reciprocating devices
}
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D21F 1/34
.
Construction or arrangement of spraying pipes
D21F 1/345
. .
{
Spraying-pipe cleaners
}
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Guiding mechanisms (suction rolls D21F 3/10)
D21F 1/365
. .
{
for controlling the lateral position of the screen
}
D21F 1/38
. .
Pads
D21F 1/40
. .
Rolls
D21F 1/42
. .
Jets
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Watermarking devices
D21F 1/46
. .
Dandy rolls
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Suction apparatus (suction rolls D21F 3/10)
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D21F 1/483
. .
{
Drainage foils and bars
}
D21F 1/486
. . .
{
adjustable
}
D21F 1/50
. .
Suction boxes with rolls
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D21F 1/52
. .
Suction boxes without rolls
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D21F 1/523
. . .
{
Covers thereof
}
D21F 1/526
. . . .
{
consisting of endless moving belts
}
D21F 1/54
.
Skimming devices, e.g. froth ledges
.
Deckle frame arrangements
D21F 1/58
.
Deckle straps
D21F 1/60
.
Cylinder moulds
D21F 1/62
.
Sand traps
D21F 1/64
.
Magnetic separators
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Pulp catching, de-watering, or recovering; Re-use of pulp-water
D21F 1/68
. .
using hydrocyclones (hydrocyclones B04C)
. .
by flotation
D21F 1/72
. .
using funnels
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D21F 1/74
. .
using cylinders
D21F 1/76
. . .
with suction
D21F 1/78
. . .
with pressure
D21F 1/80
. .
using endless screening belts
D21F 1/82
. .
adding fibre agglomeration compositions
Transferring webs from wet ends to press sections
{
(handling webs in general B65H)
}
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D21F 3/00
Press section of machines for making continuous webs of paper
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D21F 3/02
.
Wet presses
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D21F 3/0209
. .
{
with extended press nip
}
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D21F 3/0218
. . .
{
Shoe presses
}
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. . . .
{
Belts or sleeves therefor
}
D21F 3/0236
. . . . .
{
manufacturing methods
}
D21F 3/0245
. . . . .
{
Means for fixing the sleeve to the roller end
}
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D21F 3/0254
. . .
{
Cluster presses, i.e. presses comprising a press chamber defined by at least three rollers
}
D21F 3/0263
. . . .
{
Sealing arrangements therefor
}
D21F 3/0272
. .
{
in combination with suction or blowing devices
}
D21F 3/0281
. .
{
in combination with a dryer roll
}
D21F 3/029
. .
{
using special water-receiving belts
}
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. .
Arrangements thereof
D21F 3/045
. . .
{
including at least one extended press nip
}
D21F 3/06
. .
Means for regulating the pressure
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. .
Pressure rolls
D21F 3/083
. . .
{
perforated
}
D21F 3/086
. . .
{
having a grooved surface
}
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. .
Suction rolls, e.g. couch rolls
D21F 3/105
. . .
{
Covers thereof
}
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D21F 5/00
Dryer section of machines for making continuous webs of paper
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D21F 5/001
.
{
Drying webs by radiant heating
}
D21F 5/002
. .
{
from infra-red-emitting elements
}
D21F 5/003
. .
{
Shutter means
}
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.
{
Drying webs by contact with heated surfaces or materials
}
D21F 5/005
. .
{
in a fluid bed
}
D21F 5/006
.
{
Drying webs by using sonic vibrations
}
D21F 5/007
.
{
Drying webs by contact with sorbent bodies
}
D21F 5/008
.
{
Drying webs by direct contact with gas flames
}
D21F 5/009
.
{
Drying webs by centrifugal treatment
}
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.
Drying on cylinders
. .
{
Construction of the cylinders
}
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D21F 5/022
. .
{
Heating the cylinders
}
D21F 5/024
. . .
{
using electrical means
}
D21F 5/025
. . .
{
using combustion gases
}
D21F 5/027
. . .
{
using a heat-transfer fluid between the heating means and the cylinder shell
}
D21F 5/028
. . .
{
using steam
}
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D21F 5/04
. .
on two or more drying cylinders
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. . .
{
in combination with suction or blowing devices
}
D21F 5/044
. . . .
{
using air hoods over the cylinders
}
D21F 5/046
. . . .
{
using pocket ventilation systems
}
D21F 5/048
. . .
{
in combination with other heating means
}
D21F 5/06
. .
Regulating temperature
D21F 5/08
. .
Arrangement of steam points in the cylinders
D21F 5/10
. .
Removing condensate from the interior of the cylinders
.
Festoon drying
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D21F 5/14
.
Drying webs by applying vacuum
D21F 5/143
. .
{
through perforated cylinders
}
D21F 5/146
. .
{
Vacuum seals
}
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D21F 5/16
.
Drying webs by electrical heating
D21F 5/162
. .
{
Resistance heating
}
D21F 5/165
. .
{
Inductive heating; Capacitive heating
}
D21F 5/167
. .
{
Microwave heating
}
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Drying webs by hot air
D21F 5/181
. .
{
on Yankee cylinder
}
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D21F 5/182
. .
{
through perforated cylinders
}
D21F 5/184
. . .
{
Surfaces thereof
}
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D21F 5/185
. .
{
Supporting webs in hot air dryers
}
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D21F 5/187
. . .
{
by air jets
}
D21F 5/188
. . . .
{
Blowing devices
}
D21F 5/20
.
Waste heat recovery
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D21F 7/00
Other details of machines for making continuous webs of paper
D21F 7/001
.
{
Wire-changing arrangements
}
D21F 7/003
.
{
Indicating or regulating the moisture content of the layer
}
D21F 7/005
.
{
Wire-tensioning devices
}
D21F 7/006
.
{
Cutting the edges of the paper-web
}
.
{
Steam showers
}
D21F 7/02
.
Mechanical driving arrangements
D21F 7/04
.
Paper-break control devices
D21F 7/06
.
Indicating or regulating the thickness of the layer; Signal devices
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D21F 7/08
.
Felts
D21F 7/083
. .
{
Multi-layer felts
}
. .
{
Substantially impermeable for transferring fibrous webs
}
D21F 7/10
. .
Seams thereof
D21F 7/12
. .
Drying
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Complete machines for making continuous webs of paper
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D21F 9/003
.
{
of the twin-wire type
}
. .
{
paper or board consisting of two or more layers
}
D21F 9/02
.
of the Fourdrinier type
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D21F 9/04
.
of the cylinder type
D21F 9/043
. .
{
with immersed cylinder
}
D21F 9/046
. .
{
with non-immersed cylinder
}
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D21F 11/00
Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
D21F 11/002
.
{
by using a foamed suspension
}
D21F 11/004
.
{
by modification of the viscosity of the suspension
}
.
{
Making patterned paper
}
D21F 11/008
.
{
Making apertured paper
}
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D21F 11/02
.
of the Fourdrinier type
. .
paper or board consisting on two or more layers
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D21F 11/06
.
of the cylinder type
D21F 11/08
. .
paper or board consisting of two or more layers
D21F 11/10
.
Making imitation mould-made paper
D21F 11/12
.
Making corrugated paper or board
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.
Making cellulose wadding, filter or blotting paper
D21F 11/145
. .
{
including a through-drying process
}
D21F 11/16
.
Making paper strips for spinning or twisting
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D21F 13/00
Making discontinuous sheets of paper, pulpboard or cardboard, or of wet web, for fibreboard production (making discontinuous sheets of board in moulds D21J; drying paper, pulpboard, or cardboard, in discontinuous sheet form F26B)
.
Making hand-made paper
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D21F 13/04
.
on cylinder board machines
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D21F 13/06
. .
Format rolls
D21F 13/08
. . .
Automatic cut-off rolls
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D21F 13/10
.
using board presses
D21F 13/12
. .
Platen presses
This page is owned by Office of Patent Classification.
Last Modified: 10/10/2013