EP0251497A2 - Band für eine Filterpresse - Google Patents

Band für eine Filterpresse Download PDF

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Publication number
EP0251497A2
EP0251497A2 EP87304834A EP87304834A EP0251497A2 EP 0251497 A2 EP0251497 A2 EP 0251497A2 EP 87304834 A EP87304834 A EP 87304834A EP 87304834 A EP87304834 A EP 87304834A EP 0251497 A2 EP0251497 A2 EP 0251497A2
Authority
EP
European Patent Office
Prior art keywords
wire
filter press
wires
edges
central portion
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Withdrawn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
EP87304834A
Other languages
English (en)
French (fr)
Other versions
EP0251497A3 (de
Inventor
Seppo Häkkinen
Raimo Kohonen
Juhani Kyytsönen
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 EP0251497A2 publication Critical patent/EP0251497A2/de
Publication of EP0251497A3 publication Critical patent/EP0251497A3/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Withdrawn legal-status Critical Current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
    • B30B9/247—Pressing band constructions
    • 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 mesh belts or"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 or minimizes the problems discussed above and wherein the speed of the filter press can be substantially improved.
  • a filter press according to the invention is characterised in that the construction of the edge regions of at least one of the wires is inelastic and stronger than the central portion of the said wire along the whole length of the wire.
  • edges of the wire include reinforcing elements stitched into the wire.
  • edges of the wire are reinforced by folding the edges twice or several times.
  • edges of the wire have a greater density of longitudinal filaments than the central portion of the wire and/or the longitudinal filaments are thicker at the edge regions than in the central region.
  • the turning roll of a filter press according to the invention increases the wire tension at the edges of the wire which results in that the edges of the wire are pressed against each other at the curving wire portion and a sealing bag is formed at the edges which prevents the slurry from flowing out over the edges. It has been found out experimentally that 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 the prior art devices. It is to be appreciated that the edge regions of said at least one wire should be such as to prevent deformation thereof out of the normal, unstressed plane of said wire.
  • Figure 1 illustrates a typical filter press, in which a web (3) of slurry is formed between two opposite rotary endless mesh belts or wires 1 and 2.
  • web 3 is fed between the oppositely rotating wires from the left-hand side of the drawing.
  • 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.
  • Figure 2 illustrates a section in the region of the turning roll 6.
  • the construction of the lower wire 2 is such as illustrated in Figure 3.
  • the construction of the edge regions or edge 7 of the wire 2 is stronger than the construction of central portion 8 of the wire.
  • the web 3 runs in a closed envelope or bag-shaped space in which it is easy to define the width of the web.
  • Reinforcing of the edges 7 can be carried out in many different ways.
  • One alternative is to stitch reinforcing elements to the edges of the wire 2. Further, reinforcing can be achieved by folding over the edges two or more times.
  • a most important feature of the invention is, however, that the longitudinal elongation of the wire 2 is smaller at the edges 7 than at the central portion 8.
  • both wires can be reinforced, if needed, though experiments have proved that reinforcing the edges of the lower wire only is usually sufficient.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Filtering Materials (AREA)
  • Paper (AREA)
EP87304834A 1986-06-04 1987-06-01 Band für eine Filterpresse Withdrawn EP0251497A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI862391A FI77991C (fi) 1986-06-04 1986-06-04 Vira vid en filtreringspress.
FI862391 1986-06-04

Publications (2)

Publication Number Publication Date
EP0251497A2 true EP0251497A2 (de) 1988-01-07
EP0251497A3 EP0251497A3 (de) 1989-07-05

Family

ID=8522754

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87304834A Withdrawn EP0251497A3 (de) 1986-06-04 1987-06-01 Band für eine Filterpresse

Country Status (2)

Country Link
EP (1) EP0251497A3 (de)
FI (1) FI77991C (de)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB227878A (en) * 1923-07-25 1925-01-26 Alfred Edwin Culley Improvements in apparatus for expressing oil or other liquids from vegetable or other substances
US1787821A (en) * 1928-10-01 1931-01-06 Henry M Halls Dehydrating press
DE1125852B (de) * 1959-02-20 1962-03-22 Laeis Werke Ag Bandfilterpresse fuer keramisches Gut
DE1677199A1 (de) * 1966-06-13 1971-01-14 Hartmann Dr Ing Otto Fruchtpresse
DE2550956C3 (de) * 1975-11-13 1979-10-25 Bruderhaus Maschinen Gmbh, 7410 Reutlingen Bandfilterpresse
NL7804119A (nl) * 1977-09-29 1979-04-02 Sulzer Ag Inrichting voor het ononderbroken vloeistofafscheidend uitpersen van uit te persen materiaal.

Also Published As

Publication number Publication date
FI77991B (fi) 1989-02-28
FI862391L (fi) 1987-12-05
FI862391A0 (fi) 1986-06-04
FI77991C (fi) 1989-06-12
EP0251497A3 (de) 1989-07-05

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Inventor name: KYYTSOENEN, JUHANI

Inventor name: KOHONEN, RAIMO

Inventor name: HAEKKINEN, SEPPO