D21F

PAPER-MAKING MACHINES

METHODS OF PRODUCING PAPER THEREON

In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme.

D21F1/00

Wet end of machines for making continuous webs of paper

D21F1/0009

Regulating the freeness of the pulp

D21F1/0018

Devices for dispensing fibres in a fluid

D21F1/0027

Screen-cloths

D21F1/0036

Multi-layer screen-cloths

D21F1/0045

Triple layer fabrics

D21F1/0054

Seams thereof

D21F1/0063

Perforated sheets

D21F1/0072

Link belts

D21F1/0081

with single endless strands travelling in generally parallel convolutions

D21F1/009

Fibre-rearranging devices

D21F1/02

Head boxes of Fourdrinier machines

D21F1/022

Means for injecting material into flow within the headbox

D21F1/024

Details of the feed chamber

D21F1/026

Details of the turbulence section

D21F1/028

Details of the nozzle section

D21F1/04

Head boxes of cylinder machines

D21F1/043

with immersed cylinders

D21F1/046

with non-immersed cylinder

D21F1/06

Regulating pulp flow

D21F1/065

Shock-absorbing devices

D21F1/08

Regulating consistency

D21F1/10

Wire-cloths production of wire-cloths B21F

D21F1/105

Multi-layer wire-cloths

D21F1/12

Seams thereof

D21F1/14

welded

D21F1/16

sewn

D21F1/18

Shaking apparatus for wire-cloths and associated parts

D21F1/20

in Fourdrinier machines

D21F1/22

in cylinder machines

D21F1/24

Tilting, raising, or lowering mechanisms for wire-cloths

D21F1/26

in Fourdrinier machines

D21F1/28

in cylinder machines

D21F1/30

Protecting wire-cloths from mechanical damage

D21F1/32

Washing wire-cloths or felts

D21F1/325

with reciprocating devices

D21F1/34

Construction or arrangement of spraying pipes

D21F1/345

Spraying-pipe cleaners

D21F1/36

Guiding mechanisms suction rolls D21F3/10

D21F1/365

for controlling the lateral position of the screen

D21F1/38

Pads

D21F1/40

Rolls

D21F1/42

Jets

D21F1/44

Watermarking devices

D21F1/46

Dandy rolls

D21F1/48

Suction apparatus suction rolls D21F3/10

D21F1/483

Drainage foils and bars

D21F1/486

adjustable

D21F1/50

Suction boxes with rolls

D21F1/52

Suction boxes without rolls

D21F1/523

Covers thereof

D21F1/526

consisting of endless moving belts

D21F1/54

Skimming devices, e.g. froth ledges

D21F1/56

Deckle frame arrangements

D21F1/58

Deckle straps

D21F1/60

Cylinder moulds

D21F1/62

Sand traps

D21F1/64

Magnetic separators

D21F1/66

Pulp catching, de-watering, or recovering

Re-use of pulp-water

D21F1/68

using hydrocyclones hydrocyclones B04C

D21F1/70

by flotation

D21F1/72

using funnels

D21F1/74

using cylinders

D21F1/76

with suction

D21F1/78

with pressure

D21F1/80

using endless screening belts

D21F1/82

adding fibre agglomeration compositions

D21F2/00

Transferring webs from wet ends to press sections

handling webs in general B65H

D21F3/00

Press section of machines for making continuous webs of paper

D21F3/02

Wet presses

D21F3/0209

with extended press nip

D21F3/0218

Shoe presses

D21F3/0227

Belts or sleeves therefor

D21F3/0236

manufacturing methods

D21F3/0245

Means for fixing the sleeve to the roller end

D21F3/0254

Cluster presses, i.e. presses comprising a press chamber defined by at least three rollers

D21F3/0263

Sealing arrangements therefor

D21F3/0272

in combination with suction or blowing devices

D21F3/0281

in combination with a dryer roll

D21F3/029

using special water-receiving belts

D21F3/04

Arrangements thereof

D21F3/045

including at least one extended press nip

D21F3/06

Means for regulating the pressure

D21F3/08

Pressure rolls

D21F3/083

perforated

D21F3/086

having a grooved surface

D21F3/10

Suction rolls, e.g. couch rolls

D21F3/105

Covers thereof

D21F5/00

Dryer section of machines for making continuous webs of paper

D21F5/001

Drying webs by radiant heating

D21F5/002

from infra-red-emitting elements

D21F5/003

Shutter means

D21F5/004

Drying webs by contact with heated surfaces or materials

D21F5/005

in a fluid bed

D21F5/006

Drying webs by using sonic vibrations

D21F5/007

Drying webs by contact with sorbent bodies

D21F5/008

Drying webs by direct contact with gas flames

D21F5/009

Drying webs by centrifugal treatment

D21F5/02

Drying on cylinders

D21F5/021

Construction of the cylinders

D21F5/022

Heating the cylinders

D21F5/024

using electrical means

D21F5/025

using combustion gases

D21F5/027

using a heat-transfer fluid between the heating means and the cylinder shell

D21F5/028

using steam

D21F5/04

on two or more drying cylinders

D21F5/042

in combination with suction or blowing devices

D21F5/044

using air hoods over the cylinders

D21F5/046

using pocket ventilation systems

D21F5/048

in combination with other heating means

D21F5/06

Regulating temperature

D21F5/08

Arrangement of steam points in the cylinders

D21F5/10

Removing condensate from the interior of the cylinders

D21F5/12

Festoon drying

D21F5/14

Drying webs by applying vacuum

D21F5/143

through perforated cylinders

D21F5/146

Vacuum seals

D21F5/16

Drying webs by electrical heating

D21F5/162

Resistance heating

D21F5/165

Inductive heating; Capacitive heating

D21F5/167

Microwave heating

D21F5/18

Drying webs by hot air

D21F5/181

on Yankee cylinder

D21F5/182

through perforated cylinders

D21F5/184

Surfaces thereof

D21F5/185

Supporting webs in hot air dryers

D21F5/187

by air jets

D21F5/188

Blowing devices

D21F5/20

Waste heat recovery

D21F7/00

Other details of machines for making continuous webs of paper

D21F7/001

Wire-changing arrangements

D21F7/003

Indicating or regulating the moisture content of the layer

D21F7/005

Wire-tensioning devices

D21F7/006

Cutting the edges of the paper-web

D21F7/008

Steam showers

D21F7/02

Mechanical driving arrangements

D21F7/04

Paper-break control devices

D21F7/06

Indicating or regulating the thickness of the layer

Signal devices

D21F7/08

Felts

D21F7/083

Multi-layer felts

D21F7/086

Substantially impermeable for transferring fibrous webs

D21F7/10

Seams thereof

D21F7/12

Drying

D21F9/00

Complete machines for making continuous webs of paper

D21F9/003

of the twin-wire type

D21F9/006

paper or board consisting of two or more layers

D21F9/02

of the Fourdrinier type

D21F9/04

of the cylinder type

D21F9/043

with immersed cylinder

D21F9/046

with non-immersed cylinder

D21F11/00

Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines

D21F11/002

by using a foamed suspension

D21F11/004

by modification of the viscosity of the suspension

D21F11/006

Making patterned paper

D21F11/008

Making apertured paper

D21F11/02

of the Fourdrinier type

D21F11/04

paper or board consisting on two or more layers

D21F11/06

of the cylinder type

D21F11/08

paper or board consisting of two or more layers

D21F11/10

Making imitation mould-made paper

D21F11/12

Making corrugated paper or board

D21F11/14

Making cellulose wadding, filter or blotting paper

D21F11/145

including a through-drying process

D21F11/16

Making paper strips for spinning or twisting

D21F13/00

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

D21F13/02

Making hand-made paper

D21F13/04

on cylinder board machines

D21F13/06

Format rolls

D21F13/08

Automatic cut-off rolls

D21F13/10

using board presses

D21F13/12

Platen presses