IPC 7 English version
D21F-D21F01312

SECTION D – TEXTILES; PAPER


D 21PAPER-MAKING; PRODUCTION OF CELLULOSE


D 21 FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON


Subclass Index

MAKING CONTINUOUS WEBS 

Complete machines 

D21F 9/00 

Details 

wet end, transfer to press section, press section, dryer section 

D21F 1/00, D21F 2/00, D21F 3/00, D21F 5/00 

other details 

D21F 7/00 

Processes 

D21F 11/00 

MAKING DISCONTINUOUS SHEETS 

D21F 13/00 


1/

00Wet end of machines for making continuous webs of paper

1/

02.Head boxes of Fourdrinier machines

1/

04.Head boxes of cylinder machines

1/

06.Regulating pulp flow

1/

08.Regulating consistency

1/

10.Wire-cloths (production of wire-cloths B21F)

1/

12..Seams thereof

1/

14...welded

1/

16...sewn

1/

18.Shaking-apparatus for wire-cloths and associated parts

1/

20..in Fourdrinier machines

1/

22..in cylinder machines

1/

24.Tilting, raising, or lowering mechanisms for wire-cloths

1/

26..in Fourdrinier machines

1/

28..in cylinder machines

1/

30.Protecting wire-cloths from mechanical damage

1/

32.Washing wire-cloths or felts

1/

34.Construction or arrangement of spraying pipes

1/

36.Guiding mechanisms (suction rolls D21F 3/10)

1/

38..Pads

1/

40..Rolls

1/

42..Jets

1/

44.Watermarking devices

1/

46..Dandy rolls

1/

48.Suction apparatus (suction rolls D21F 3/10)

1/

50..Suction boxes with rolls

1/

52..Suction boxes without rolls

1/

54.Skimming devices, e.g. froth ledges

1/

56.Deckle frame arrangements

1/

58.Deckle straps

1/

60.Cylinder moulds

1/

62.Sand traps

1/

64.Magnetic separators

1/

66.Pulp catching, de-watering, or recovering; Re-use of pulp-water

1/

68..using hydrocyclones (hydrocyclones B04C)

1/

70..by flotation

1/

72..using funnels

1/

74..using cylinders

1/

76...with suction

1/

78...with pressure

1/

80..using endless screening belts

1/

82..adding fibre agglomeration compositions


2/

00Transferring webs from wet ends to press sections


3/

00Press section of machines for making continuous webs of paper

3/

02.Wet presses

3/

04..Arrangements thereof

3/

06..Means for regulating the pressure

3/

08..Pressure rolls

3/

10..Suction rolls, e.g. couch rolls


5/

00Dryer section of machines for making continuous webs of paper

5/

02.Drying on cylinders

5/

04..on two or more drying cylinders

5/

06..Regulating temperature

5/

08..Arrangement of steam points in the cylinders

5/

10..Removing condensate from the interior of the cylinders

5/

12.Festoon drying

5/

14.Drying webs by applying vacuum

5/

16.Drying webs by electrical heating

5/

18.Drying webs by hot air

5/

20.Waste heat recovery


7/

00Other details of machines for making continuous webs of paper

7/

02.Mechanical driving arrangements

7/

04.Paper-break control devices

7/

06.Indicating or regulating the thickness of the layer; Signal devices

7/

08.Felts

7/

10..Seams thereof

7/

12..Drying


9/

00Complete machines for making continuous webs of paper

9/

02.of the Fourdrinier type

9/

04.of the cylinder type


11/

00Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibreboard production, on paper-making machines

11/

02.of the Fourdrinier type

11/

04..paper or board consisting of two or more layers

11/

06.of the cylinder type

11/

08..paper or board consisting of two or more layers

11/

10.Making imitation mould-made paper

11/

12.Making corrugated paper or board

11/

14.Making cellulose wadding, filter- or blotting paper

11/

16.Making paper strips for spinning or twisting


13/

00Making 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)

13/

02.Making hand-made paper

13/

04.on cylinder board machines

13/

06..Format rolls

13/

08...Automatic cut-off rolls

13/

10.using board presses

13/

12..Platen presses