EP0248625A2 - Filterpresse - Google Patents

Filterpresse Download PDF

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Publication number
EP0248625A2
EP0248625A2 EP87304835A EP87304835A EP0248625A2 EP 0248625 A2 EP0248625 A2 EP 0248625A2 EP 87304835 A EP87304835 A EP 87304835A EP 87304835 A EP87304835 A EP 87304835A EP 0248625 A2 EP0248625 A2 EP 0248625A2
Authority
EP
European Patent Office
Prior art keywords
wires
filter press
roll
turning roll
wire
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP87304835A
Other languages
English (en)
French (fr)
Other versions
EP0248625A3 (de
Inventor
Jukka Heino
Raimo Kohonen
Pekka Pöyry
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ahlstrom Corp
Original Assignee
Ahlstrom Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ahlstrom Corp filed Critical Ahlstrom Corp
Publication of EP0248625A2 publication Critical patent/EP0248625A2/de
Publication of EP0248625A3 publication Critical patent/EP0248625A3/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/24—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using an endless pressing band
    • B30B9/248—Means for sealing the press zone

Definitions

  • the present invention relates to a filter press used for removing excess water from a slurry cake travelling between two opposite endless wires such as used for making paper or board.
  • the filter press comprises a pre-pressing section and a post-pressing section, and between them a turning roll extending substantially over the whole width of the wires in a direction transverse to the direction of extension of the wires and disposed to change the running direction of the wires.
  • the longitudinal tensile stressing of the wire increases in the middle of the wire and the tensile stressing at the edges may even be negative which means that the wire slackens at the edges whereby slurry may flow over the edges, especially at the pre-pressing section.
  • edge sealings and "doctors" are provided at the straight portion of the wire.
  • the object of the invention is to provide a filter press which avoids the problems discussed above and with which the speed of the filter press can be substantially improved.
  • a filter press according to the invention is characterised in that the ends of the turning roll are,at least during operation of the filter press, closer to the wire furthest away from the turning roll than is the centre or central portion of the turning roll.
  • a preferred embodiment of the invention is charac­terized by the feature that the diameter of the ends of the turning roll is greater than the diameter of the central portion of the roll.
  • Another preferred embodiment of the invention is characterized in that substantially the whole turning roll is made of a flexible material.
  • Yet another preferred embodiment of the invention is characterized in that the material of the ends of the turning roll is harder than the material of the central portion.
  • Some of the most important advantages of the invention are that as the ends of the turning roll are lower than the central portion or closer to the wire further away from the roll, they create a greater wire tension at the edges of the wire than a turning roll having the same diameter from one end to the other.
  • An increased wire tension at the edges of the wire presses the edges against each other at the curved wire portion and creates a sealing bag or enclosure sealed at the edges which prevents the slurry from flowing out over the edges.
  • the sealing effect of a turning roll according to the invention is particularly effective at the pre-pressing section where the most difficult sealing problems occur today. Defining the web with a filter press according to the invention is remarkably easier than with prior art devices.
  • Fig. 1 illustrates a typical filter press, in which a web 3 of slurry is formed between two oppositely rotatable wires 1 and 2.
  • web 3 is feb between the wires from the left.
  • the filter press comprises a pre-pressing section 4 and a post-pressing section 5 for removing excess water from the web.
  • a turning roll 6, at which the webs are turned, is disposed between these sections.
  • the turning rolls of the filter presses and used hitherto are stiff and have the same diameter from one end of the roll to the other.
  • the uniform turning roll may be replaced with a turning roll 6 such as illustrated in Figs. 2 - 5.
  • Fig. 2 illustrates a turning roll 6 made according to the invention.
  • the diameter of ends 7 of the turning roll is greater than that of the central portion 8 of the roll.
  • the cross section of the lower wire 2 remains constant and a web is formed on it with the upper wire curving towards the central portion 8 of the turning roll 6.
  • the wires run into contact with each other and a bag of web is formed between the wires 1 and 2 from which the wet slurry cannot flow from between the edges of the wires and whereby defining of the web in the lateral direction is easy to control.
  • Fig. 3 illustrates a turning roll 6 which also gives the web forming result described above.
  • the ends 7 of the roll 6 are made of a harder material than the center portion 8 of the roll.
  • the central portion is so soft that it yields and the upper wire forms the arch illustrated in the figure.
  • Fig. 4 illustrates a turning roll 6 made according to the invention of a flexible material.
  • the turning roll is cylindrical and its longitudinal axis is straight but during operation the material yields and the bending illustrated in the figure is achieved.
  • the edges of the wires are pressed against each other and an enclosure bag is formed between the wires for the slurry 3.
  • Fig. 5 illustrates yet another embodiment in which the diameter of the ends of the turning roll 6 is larger than that of the central portion of the roll.
  • portions 9 between the ends 7 and the central portion 8 have the shape of a truncated cone. This embodiment also gives the desired result, i.e. the edges of the wires are sealed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Filtration Of Liquid (AREA)
EP87304835A 1986-06-04 1987-06-01 Filterpresse Withdrawn EP0248625A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI862390A FI76855C (fi) 1986-06-04 1986-06-04 Filtreringspress.
FI862390 1986-06-04

Publications (2)

Publication Number Publication Date
EP0248625A2 true EP0248625A2 (de) 1987-12-09
EP0248625A3 EP0248625A3 (de) 1989-07-05

Family

ID=8522753

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87304835A Withdrawn EP0248625A3 (de) 1986-06-04 1987-06-01 Filterpresse

Country Status (2)

Country Link
EP (1) EP0248625A3 (de)
FI (1) FI76855C (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015167878A (ja) * 2014-03-05 2015-09-28 住友重機械エンバイロメント株式会社 ベルトプレス脱水機及びその運転方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE285594C (de) *
DE1677199A1 (de) * 1966-06-13 1971-01-14 Hartmann Dr Ing Otto Fruchtpresse
DE3404422A1 (de) * 1983-03-24 1984-10-04 Anstalt für Strömungsmaschinen GmbH, Graz Dichteinrichtung der keilpartie von entwaesserungsmaschinen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015167878A (ja) * 2014-03-05 2015-09-28 住友重機械エンバイロメント株式会社 ベルトプレス脱水機及びその運転方法

Also Published As

Publication number Publication date
FI76855C (fi) 1988-12-12
FI862390A0 (fi) 1986-06-04
EP0248625A3 (de) 1989-07-05
FI76855B (fi) 1988-08-31
FI862390L (fi) 1987-12-05

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Inventor name: POEYRY, PEKKA

Inventor name: HEINO, JUKKA

Inventor name: KOHONEN, RAIMO