GB2069358A - Reinforced membrane - Google Patents

Reinforced membrane Download PDF

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Publication number
GB2069358A
GB2069358A GB8005152A GB8005152A GB2069358A GB 2069358 A GB2069358 A GB 2069358A GB 8005152 A GB8005152 A GB 8005152A GB 8005152 A GB8005152 A GB 8005152A GB 2069358 A GB2069358 A GB 2069358A
Authority
GB
United Kingdom
Prior art keywords
membrane
reinforcing layer
recess
boss
plate
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Withdrawn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
GB8005152A
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.)
Moseley Rubber Co Ltd
Original Assignee
Moseley Rubber Co Ltd
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 Moseley Rubber Co Ltd filed Critical Moseley Rubber Co Ltd
Priority to GB8005152A priority Critical patent/GB2069358A/en
Publication of GB2069358A publication Critical patent/GB2069358A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D25/00Filters formed by clamping together several filtering elements or parts of such elements
    • B01D25/12Filter presses, i.e. of the plate or plate and frame type
    • B01D25/164Chamber-plate presses, i.e. the sides of the filtering elements being clamped between two successive filtering plates
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D25/00Filters formed by clamping together several filtering elements or parts of such elements
    • B01D25/12Filter presses, i.e. of the plate or plate and frame type
    • B01D25/21Plate and frame presses
    • B01D25/215Construction of the filter plates, frames
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D25/00Filters formed by clamping together several filtering elements or parts of such elements
    • B01D25/28Leaching or washing filter cakes in the filter handling the filter cake for purposes other than regenerating
    • B01D25/282Leaching or washing filter cakes in the filter handling the filter cake for purposes other than regenerating for drying
    • B01D25/285Leaching or washing filter cakes in the filter handling the filter cake for purposes other than regenerating for drying by compression using inflatable membranes

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

A membrane (15) for use with a filter press plate (10) has a reinforcing layer (16) therein in the or each region of contact of the membrane (15) with a stay boss (13) of the plate (10). The reinforcing layer (16) is located adjacent the cloth-supporting surface (17) of the membrane (15) remote from the boss (13) and a second reinforcing layer (18) may be provided adjacent the boss contacting surface (19). An intermediate reinforcing layer may also be provided. The reinforcing layers, (16, 18) of square woven fabric or apertured steel plate, prevent lateral spreading of the membrane (15) under load in the regions of the bosses (13) and thus prolong membrane life. <IMAGE>

Description

SPECIFICATION Reinforced membrane This invention relates to membrane plates of filter presses and in particular to the membranes of such plates.
Membrane plates for such filter presses are formed having relatively thin central regions and relatively thick peripheral rims whereby a recess is provided in the opposed faces of the plate. When a plurality of such plates are placed in face to face disposition in a press the aforesaid recesses provide cavities between adjacent plates, contact between adjacent plates being in the peripheral rim regions. In order to prevent or minimise distortion of the plates under load it is known to provide raised portions, or stay bosses, on the base of the recesses. Such bosses have a height equal to or slightly less than the depth of the recess so that bosses on adjacent plates contact each other when the plates are under load thus preventing or minimising plate distortion.However, with such plates it has been found that the life of a membrane and/or filter cloth in the region of such stay bosses. This necessitates frequent and expensive replacement of the membrane plates and/or the filter cloths.
It is object of the present invention to provide means whereby the frequency, by which the membranes and/or filter cloths associated with filter plates having stay bosses thereon require replacement, is reduced considerably.
The invention provides a membrane, for use with a membrane plate having a recess in at least one face thereof, a rim portion extending around said recess and at least one boss extending outwardly of the base of said recess, said member having a reinforcing layer therein at least in the region thereof which in use is contacted by said boss whilst said membrane extends across said recess, said reinforcing layer being located adjacent the boss-remote surface of said membrane.
The invention also provides a membrane plate and membrane as aforesaid, and said membrane may be secured to said membrane plate at least in the region of the rim portion thereof.
The reinforcing layer may lie in the range .25 mm to 6 mm below said outer surface of the membrane, and preferably in the range .25 mm to 2.5 mm below said outer surface.
The membrane may have a second reinforcing layer in the region contacted by said boss adjacent the inner boss-adjacent surface of the membrane.
The reinforcing layer may lie in the range .25 mm to 6 mm below said inner surface of the membrane, and preferably in the range .24 mm to 2.5 mm below said inner surface.
Preferably the or each reinforcing layer is bonded into the material of the membrane and the or each reinforcing layer may comprise a square woven fabric or a metal sheet. In the latter case the sheet is preferably apertured and of steel.
One embodiment of membrane plate in accordance with the invention will now be described with reference to the accompanying drawing in which~ Fig. 1 is a front elevation; and Fig. 2 is a sectional plan on line 2-2 of Fig. 1.
Referring now to the Figures, there is shown a membrane plate 10 having a recess 11 in each face thereof and a rim portion 12 extending around each recess 11. Stay bosses 13 are provided on the membrane plate 10, each of such bosses 13 being shown, whereby each boss 13 extends outwardly of the base 14 of a recess 1 1.
A single membrane 15 is moulded onto the plate 10 and is attached thereto in the region of the rim 20 so as to extend across the recesses 1 The height of the bosses 13 is equal to or slightly less than the depth of a recess 11.
In use as slurry is introduced through inlet 15 into the cavity formed by the recesses 1 1 of adjacent plates 10 the membrane 1 5 if forced to conform to the surface of the membrane plate 10 and lie in contact with bases 14 and bosses 13 as shown in Figs. 2.
In the membrane 15, in the region thereof contacted by each boss 13, there is a reinforcing layer 16 adjacent the outer boss-remote surface 1 7. Also in the same region there is a second reinforcing layer 18 adjacent the inner, boss contacting surface 19.
Each reinforcing layer 16, 18 lies within the range .25 mm to 6 mm, and preferably within the range .25 mm to 2.5 mm, of the adjacent surface 17, 19 of the membrane 1 5. Each reinforcing layer is of a square woven fabric or apertured steel sheet and is bonded to the rubber material from which the membrane is made, reinforcing layers 1 6 and 18 preferably but not necessarily being of the same material.
The reinforcing layers 16, 18 will allow substantially no movement or stretch of the membrane 1 5 in the plane of the membrane, such as tends to occur in the region of the bosses 13 in unreinforced membranes under the compressive forces exerted thereon in use.
The further the reinforcing layer 1 6 lies below the surface 1 7 of the membrane 1 5 the greater is the tensile strength required by that reinforcing layer in order to prevent such aforementioned movement and stretch of the membrane under applied compressive loading. In consequence it is preferred that the reinforcing layer 16 is as close to the surface 17 as is possible whilst still maintaining a layer of membrane material between the layer 16 and a filter cloth (not shown) in contact with the surface 17.
The provision of a second reinforcing layer 18 in the membrane 15 further assists in preventing or minimizing lateral stretch of the membrane 1 5 in the region of the bosses 13, particularly advantageous when very large compressive forces are to be applied to the membrane. In such circumstances a further intermediate reinforcing layer or layers may be provided in this region of the membrane 15.

Claims (21)

1. A membrane, for use with a membrane plate having a recess in at least one face thereof, a rim portion extending around said recess and at least one boss extending outwardly of the base of said recesses, said membrane having a reinforcing layer therein at least in a region thereof which in use is contacted by said boss whilst said membrane extends across said recess.
2. A membrane according to claim 1 wherein said reinforcing layer is located adjacent an outer surface of said membrane which in use is remote from said boss.
3. A membrane according to claim 2 wherein said reinforcing layer lies at a distance of between .25 and 6 mm from said outer surface.
4. A membrane according to claim 3 wherein said reinforcing layer lies at a distance of between .25 and 2.5 mm from said outer surface.
5. A membrane according to any one of claims 2 to 4 having a second reinforcing layer in said region said second reinforcing layer being located adjacent an inner surface of said membrane which in use is adjacent said boss.
6. A membrane according to claim 5 wherein said second reinforcing layer lies at a distance of between .25 and 6 mm from said inner surface.
7. A membrane according to claim 6 wherein said second reinforcing layer lies at a distance of between .25 and 2.5 mm from said inner surface.
8. A membrane according to any one of claims 1 to 7 wherein the or each reinforcing layer is bonded into the material of the membrane.
9. A membrane according to any one of claims 1 to 8 wherein the or each reinforcing layer comprises a square woven fabric.
10. A membrane according to any one of claims 1 to 8 wherein the or each reinforcing layer comprises a metal sheet.
1 1. A membrane according to claim 10 wherein said metal sheet is perforate.
12. A membrane according to claim 10 or claim 11 wherein said metal sheet is of steel.
13. A membrane according to claim 5 or any claim dependent thereon comprising a third reinforcing layer intermediate said reinforcing layers.
14. A membrane plate having a recess in at least one face thereof, a rim portion extending around said recess, at least one boss extending outwardly of the base of said recess and a membrane according to any one of claims 1 to 13.
15. A membrane plate according to claim 14 wherein said membrane is secured to said plate at least in the region of said rim portion.
16. A membrane plate according to claim 14 of claim 15 having a recess in each face thereof, at least one boss extending outwardly of each recess base and a membrane extending across each recess.
17. A membrane plate according to claim 16 comprising a single membrane moulded onto said plate so as to extend across both recesses.
18. A membrane plate according to any one of claims 14 to 1 7 comprising a plurality of bosses extending outwardly from the or each recess.
19. A membrane plate according to any one of claims 14 to 18 wherein the height of the or each boss is equal to or less than but substantially equal to the depth of the or each respective recess.
20. A membrane substantially as hereinbefore described.
21. A membrane plate substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
GB8005152A 1980-02-15 1980-02-15 Reinforced membrane Withdrawn GB2069358A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8005152A GB2069358A (en) 1980-02-15 1980-02-15 Reinforced membrane

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8005152A GB2069358A (en) 1980-02-15 1980-02-15 Reinforced membrane

Publications (1)

Publication Number Publication Date
GB2069358A true GB2069358A (en) 1981-08-26

Family

ID=10511385

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8005152A Withdrawn GB2069358A (en) 1980-02-15 1980-02-15 Reinforced membrane

Country Status (1)

Country Link
GB (1) GB2069358A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0233980A1 (en) * 1986-02-25 1987-09-02 Klinkau &amp; Co. GmbH Membrane filter plate for a filter press or the like with supporting bosses
EP0440205A1 (en) * 1990-01-30 1991-08-07 Kurita Machinery Manufacturing Company Limited Pressing diaphragm and pressing filter plate for a compression type filter press
WO2001037962A2 (en) * 1999-11-25 2001-05-31 Outokumpu Oyj Press membrane from a rubber-elastic material

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0233980A1 (en) * 1986-02-25 1987-09-02 Klinkau &amp; Co. GmbH Membrane filter plate for a filter press or the like with supporting bosses
US4781829A (en) * 1986-02-25 1988-11-01 Reimund Stanik Membrane filter plate for a filter press or the like with support bose bosses
EP0440205A1 (en) * 1990-01-30 1991-08-07 Kurita Machinery Manufacturing Company Limited Pressing diaphragm and pressing filter plate for a compression type filter press
US5124036A (en) * 1990-01-30 1992-06-23 Kurita Machinery Manufacturing Co., Ltd. Pressing diaphragm and pressing filter plate provided with pressing diaphragm of compression type filter press
WO2001037962A2 (en) * 1999-11-25 2001-05-31 Outokumpu Oyj Press membrane from a rubber-elastic material
WO2001037962A3 (en) * 1999-11-25 2001-11-01 Outokumpu Oy Press membrane from a rubber-elastic material
AU781418B2 (en) * 1999-11-25 2005-05-19 Outokumpu Oyj Press membrane from a rubber-elastic material
US6919024B1 (en) 1999-11-25 2005-07-19 Outokumpu Oyj Press membrane from a rubber-elastic material

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Legal Events

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)