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WO1998035742A1 - Courroie de pressage de filtre-presse - Google Patents

Courroie de pressage de filtre-presse Download PDF

Info

Publication number
WO1998035742A1
WO1998035742A1 PCT/GB1998/000478 GB9800478W WO9835742A1 WO 1998035742 A1 WO1998035742 A1 WO 1998035742A1 GB 9800478 W GB9800478 W GB 9800478W WO 9835742 A1 WO9835742 A1 WO 9835742A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter press
press belt
membrane
belt
machine direction
Prior art date
Application number
PCT/GB1998/000478
Other languages
English (en)
Inventor
Hans Vello Wilhelm Haasma
Original Assignee
Scapa Group Plc
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 Scapa Group Plc filed Critical Scapa Group Plc
Priority to EP98904291A priority Critical patent/EP0963230A1/fr
Priority to CA002281549A priority patent/CA2281549A1/fr
Publication of WO1998035742A1 publication Critical patent/WO1998035742A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/58—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element
    • B01D33/62—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying
    • B01D33/64—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying by compression
    • B01D33/642—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying by compression by pressure belts

Definitions

  • the present invention relates to a filter press belt.
  • Belt filter presses are used in a wide number of industries to separate solids from fluids.
  • a common application for belt filter presses is in removing water from sludge in, for example, processes used in paper mills, sewage works, water treatment plants or mines.
  • One application for belt filter presses involves dewatering mineral waste products such as gypsum produced as a result of lime solution being sprayed
  • Belt filter presses are also used for dewatering raw materials such as coal, buaxite, iron ore, potash or phosphates, or for screening materials. They are also used in chemical production processes, for example, in the manufacture of ascorbic acid, citric acid, pectin or phosphoric acid. During the production of phosphoric acid the filter press is used to remove the gypsum waste product from the acid.
  • the water content is reduced so that when the sludge if removed for transportation the water is not being transported. This decreases transportation costs. Water removal is also beneficial if the sludge is to be incinerated.
  • mills are normally located near the wood source, i.e. forested areas and the pulp is then
  • Belt filter presses generally comprise two endless belts, the lower belt being arranged generally horizontally. Water is drained from the initial section of the lower belt under gravity. The upper belt runs over the end section of the lower belt in a so-
  • presses again comprise two moving endless belts which form a nip therebetween.
  • woven structures with a plain or twill weave comprising coarse, such as 1.2 mm
  • thermoplastics material comprising a non-woven mesh membrane moulded from thermoplastics material.
  • the moulding process which is used to make the membrane is quicker, less
  • the filter press belt solely consists of one or more of said mesh membranes, and provides a planar load transfer surface.
  • the membrane is preferably resilient, as these belts operate at high press loads.
  • elastomeric material for forming the mesh membrane.
  • Preferred elastomeric materials include any of the following either alone or in combination with
  • nylon or polyurethane matric may be reinforced by dimensionally stable PET or PEN
  • the membrane may conveniently be manufactured in accordance with the
  • thermoset polymers to be used as matrix material, enabling abrasion resistance
  • the membrane may be any material having resilience and pH resistance to be optimised. It is noted that the membrane may be any material having resilience and pH resistance to be optimised. It is noted that the membrane may be any material having resilience and pH resistance to be optimised. It is noted that the membrane may be any material having resilience and pH resistance to be optimised. It is noted that the membrane may be any material having resilience and pH resistance to be optimised. It is noted that the membrane may be any material having resilience and pH resistance to be optimised. It is noted that the membrane may be any material
  • Multi-layered membrane structures may be used to create a permeability
  • One or more yarn members may be incorporated within at least one of the
  • Cross-direction rigidity can be improved by incorporating one or more ya
  • the membrane may be laminated with woven fabric, knitted fabric and/or non-woven fabric
  • the knitted or woven fabric may be very open. Such fabrics are ideally located on the
  • the membrane may comprise channels for draining liquid, the channels ideally
  • the membrane that is remote from the side of the fabric that initially contacts the material to be filtered so as not to affect the planar nature of that side of the fabric.
  • the channels may be formed by utilising membranes which have lands of differing
  • a machine direction drainage channel may be formed by moulding a
  • Fig.1 is a perspective view of part of one filter press belt in accordance with the invention.
  • Fig.2 is a cross section in the cross machine direction of a second belt in
  • Fig.3 is a cross section in the cross machine direction of a third belt in accordance with the present invention.
  • Fig.4 is a cross section in the cross machine direction of a fourth belt in
  • a filter press belt 10 only part of which is shown comprises a
  • the membrane comprises machine direction lands 11 and cross-machine direction lands 12. Rectangular apertures 13 are defined
  • a ya member is encapsulated in each machine direction land 11.
  • the membrane is used in a double wire press or heavy duty press of a
  • a filter press belt 15 comprises a mesh membrane of the type
  • membrane is laminated to a layer of non- woven material 16 comprising a batt of staple
  • the belt has a similar use to the belt described with reference to fig.1.
  • a batt 17 is illustrated which is similar to that illustrated with reference to fig.2 and again similar reference numerals are used to indicate like parts.
  • a needlefelt 18 i.e. a composite woven and non-woven material comprising a batt

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Materials (AREA)
  • Woven Fabrics (AREA)

Abstract

L'invention concerne une courroie de pressage de filtre-presse, qui comprend une membrane (10) à mailles non tissées, moulée dans une matière thermoplastique, de manière à constituer une surface de transfert de charges plane.
PCT/GB1998/000478 1997-02-14 1998-02-16 Courroie de pressage de filtre-presse WO1998035742A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP98904291A EP0963230A1 (fr) 1997-02-14 1998-02-16 Courroie de pressage de filtre-presse
CA002281549A CA2281549A1 (fr) 1997-02-14 1998-02-16 Courroie de pressage de filtre-presse

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9703037.3A GB9703037D0 (en) 1997-02-14 1997-02-14 Filter press belt
GB9703037.3 1997-02-14

Publications (1)

Publication Number Publication Date
WO1998035742A1 true WO1998035742A1 (fr) 1998-08-20

Family

ID=10807631

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1998/000478 WO1998035742A1 (fr) 1997-02-14 1998-02-16 Courroie de pressage de filtre-presse

Country Status (4)

Country Link
EP (1) EP0963230A1 (fr)
CA (1) CA2281549A1 (fr)
GB (1) GB9703037D0 (fr)
WO (1) WO1998035742A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001088261A1 (fr) * 2000-05-08 2001-11-22 Sca Hygiene Products Ab Procede et dispositif de production d'un non-tisse
DE102018211667A1 (de) * 2018-07-12 2020-01-16 SKZ - Testing GmbH Verfahren zur Fertigung einer Kunststoffdränbahn und Kunststoffdränbahn

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4740409A (en) * 1987-03-31 1988-04-26 Lefkowitz Leonard R Nonwoven fabric and method of manufacture
EP0250421B1 (fr) * 1985-03-01 1990-09-19 Stowe Woodward Finland Oy Structure plate permeable aux liquides, et son procede de fabrication
WO1991002642A1 (fr) * 1989-08-25 1991-03-07 Huyck Corporation Enveloppe en papier moule

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0250421B1 (fr) * 1985-03-01 1990-09-19 Stowe Woodward Finland Oy Structure plate permeable aux liquides, et son procede de fabrication
US4740409A (en) * 1987-03-31 1988-04-26 Lefkowitz Leonard R Nonwoven fabric and method of manufacture
WO1991002642A1 (fr) * 1989-08-25 1991-03-07 Huyck Corporation Enveloppe en papier moule

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001088261A1 (fr) * 2000-05-08 2001-11-22 Sca Hygiene Products Ab Procede et dispositif de production d'un non-tisse
US6708381B2 (en) 2000-05-08 2004-03-23 Sca Hygiene Products Ab Method and device for producing a nonwoven material
DE102018211667A1 (de) * 2018-07-12 2020-01-16 SKZ - Testing GmbH Verfahren zur Fertigung einer Kunststoffdränbahn und Kunststoffdränbahn
US12023828B2 (en) 2018-07-12 2024-07-02 Helmut Zanzinger Method for manufacturing a plastic drain sheet, and plastic drain sheet

Also Published As

Publication number Publication date
CA2281549A1 (fr) 1998-08-20
GB9703037D0 (en) 1997-04-02
EP0963230A1 (fr) 1999-12-15

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