WebCPC CPC COOPERATIVE PATENT CLASSIFICATION

D21F　PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON

D21F 1/00 Wet end of machines for making continuous webs of paper

D21F 1/0009 ・{Regulating the freeness of the pulp}

D21F 1/0018 ・{Devices for dispensing fibres in a fluid}

D21F 1/0027 ・{Screen-cloths}

D21F 1/0036 ・・{Multi-layer screen-cloths}

D21F 1/0045 ・・・{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}

D21F 1/009 ・{Fibre-rearranging devices}

D21F 1/02 ・Head boxes of Fourdrinier machines

D21F 1/022 ・・{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}

D21F 1/04 ・Head boxes of cylinder machines

D21F 1/043 ・・{with immersed cylinders}

D21F 1/046 ・・{with non-immersed cylinder}

D21F 1/06 ・Regulating pulp flow

D21F 1/065 ・・{Shock-absorbing devices}

D21F 1/08 ・Regulating consistency

D21F 1/10 ・Wire-cloths (production of wire-cloths B21F)

D21F 1/105 ・・{Multi-layer wire-cloths}

D21F 1/12 ・・Seams thereof

D21F 1/14 ・・・welded

D21F 1/16 ・・・sewn

D21F 1/18 ・Shaking apparatus for wire-cloths and associated parts

D21F 1/20 ・・in fourdrinier machines

D21F 1/22 ・・in cylinder machines

D21F 1/24 ・Tilting, raising, or lowering mechanisms for wire-cloths

D21F 1/26 ・・in Fourdrinier machines

D21F 1/28 ・・in cylinder machines

D21F 1/30 ・Protecting wire-cloths from mechanical damage

D21F 1/32 ・Washing wire-cloths or felts

D21F 1/325 ・・{with reciprocating devices}

D21F 1/34 ・Construction or arrangement of spraying pipes

D21F 1/345 ・・{Spraying-pipe cleaners}

D21F 1/36 ・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

D21F 1/44 ・Watermarking devices

D21F 1/46 ・・Dandy rolls

D21F 1/48 ・Suction apparatus (suction rolls D21F 3/10)

D21F 1/483 ・・{Drainage foils and bars}

D21F 1/486 ・・・{adjustable}

D21F 1/50 ・・Suction boxes with rolls

D21F 1/52 ・・Suction boxes without rolls

D21F 1/523 ・・・{Covers thereof}

D21F 1/526 ・・・・{consisting of endless moving belts}

D21F 1/54 ・Skimming devices, e.g. froth ledges

D21F 1/56 ・Deckle frame arrangements

D21F 1/58 ・Deckle straps

D21F 1/60 ・Cylinder moulds

D21F 1/62 ・Sand traps

D21F 1/64 ・Magnetic separators

D21F 1/66 ・Pulp catching, de-watering, or recovering; Re-use of pulp-water

D21F 1/68 ・・using hydrocyclones (hydrocyclones B04C)

D21F 1/70 ・・by flotation

D21F 1/72 ・・using funnels

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

D21F 2/00 Transferring webs from wet ends to press sections {(handling webs in general B65H)}

D21F 3/00 Press section of machines for making continuous webs of paper

D21F 3/02 ・Wet presses

D21F 3/0209 ・・{with extended press nip}

D21F 3/0218 ・・・{Shoe presses}

D21F 3/0227 ・・・・{Belts or sleeves therefor}

D21F 3/0236 ・・・・・{manufacturing methods}

D21F 3/0245 ・・・・・{Means for fixing the sleeve to the roller end}

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}

D21F 3/04 ・・Arrangements thereof

D21F 3/045 ・・・{including at least one extended press nip}

D21F 3/06 ・・Means for regulating the pressure

D21F 3/08 ・・Pressure rolls

D21F 3/083 ・・・{perforated}

D21F 3/086 ・・・{having a grooved surface}

D21F 3/10 ・・Suction rolls, e.g. couch rolls

D21F 3/105 ・・・{Covers thereof}

D21F 5/00 Dryer section of machines for making continuous webs of paper

D21F 5/001 ・{Drying webs by radiant heating}

D21F 5/002 ・・{from infra-red-emitting elements}

D21F 5/003 ・・{Shutter means}

D21F 5/004 ・{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}

D21F 5/02 ・Drying on cylinders

D21F 5/021 ・・{Construction of the cylinders}

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}

D21F 5/04 ・・on two or more drying cylinders

D21F 5/042 ・・・{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

D21F 5/12 ・Festoon drying

D21F 5/14 ・Drying webs by applying vacuum

D21F 5/143 ・・{through perforated cylinders}

D21F 5/146 ・・{Vacuum seals}

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}

D21F 5/18 ・Drying webs by hot air

D21F 5/181 ・・{on Yankee cylinder}

D21F 5/182 ・・{through perforated cylinders}

D21F 5/184 ・・・{Surfaces thereof}

D21F 5/185 ・・{Supporting webs in hot air dryers}

D21F 5/187 ・・・{by air jets}

D21F 5/188 ・・・・{Blowing devices}

D21F 5/20 ・Waste heat recovery

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}

D21F 7/008 ・{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

D21F 7/08 ・Felts

D21F 7/083 ・・{Multi-layer felts}

D21F 7/086 ・・{Substantially impermeable for transferring fibrous webs}

D21F 7/10 ・・Seams thereof

D21F 7/12 ・・Drying

D21F 9/00 Complete machines for making continuous webs of paper

D21F 9/003 ・{of the twin-wire type}

D21F 9/006 ・・{paper or board consisting of two or more layers}

D21F 9/02 ・of the Fourdrinier type

D21F 9/04 ・of the cylinder type

D21F 9/043 ・・{with immersed cylinder}

D21F 9/046 ・・{with non-immersed cylinder}

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}

D21F 11/006 ・{Making patterned paper}

D21F 11/008 ・{Making apertured paper}

D21F 11/02 ・of the Fourdrinier type

D21F 11/04 ・・paper or board consisting on two or more layers

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

D21F 11/14 ・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

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)

D21F 13/02 ・Making hand-made paper

D21F 13/04 ・on cylinder board machines

D21F 13/06 ・・Format rolls

D21F 13/08 ・・・Automatic cut-off rolls

D21F 13/10 ・using board presses

D21F 13/12 ・・Platen presses