GB2146545A - A filter press cloth and filter press - Google Patents

A filter press cloth and filter press Download PDF

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Publication number
GB2146545A
GB2146545A GB08419468A GB8419468A GB2146545A GB 2146545 A GB2146545 A GB 2146545A GB 08419468 A GB08419468 A GB 08419468A GB 8419468 A GB8419468 A GB 8419468A GB 2146545 A GB2146545 A GB 2146545A
Authority
GB
United Kingdom
Prior art keywords
filter
cloth
press
filter press
plates
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.)
Granted
Application number
GB08419468A
Other versions
GB8419468D0 (en
GB2146545B (en
Inventor
William John Morris
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.)
Shirley Institute
Original Assignee
Shirley Institute
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 Shirley Institute filed Critical Shirley Institute
Publication of GB8419468D0 publication Critical patent/GB8419468D0/en
Publication of GB2146545A publication Critical patent/GB2146545A/en
Application granted granted Critical
Publication of GB2146545B publication Critical patent/GB2146545B/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
    • B01D25/12—Filter presses, i.e. of the plate or plate and frame type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
    • B01D25/12—Filter presses, i.e. of the plate or plate and frame type
    • B01D25/176—Filter presses, i.e. of the plate or plate and frame type attaching the filter element to the filter press plates, e.g. around the central feed hole in the plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
    • B01D25/30—Feeding devices ; Discharge devices
    • B01D25/307—Feeding devices ; Discharge devices with internal recirculation through the filtering element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/08—Filter cloth, i.e. woven, knitted or interlaced material
    • B01D39/083—Filter cloth, i.e. woven, knitted or interlaced material of organic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/08—Filter cloth, i.e. woven, knitted or interlaced material
    • B01D39/086—Filter cloth, i.e. woven, knitted or interlaced material of inorganic material
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/40—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads
    • D03D15/49—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads textured; curled; crimped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0471—Surface coating material
    • B01D2239/0478—Surface coating material on a layer of the filter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2321/00—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D10B2321/02—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polyolefins
    • D10B2321/022—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polyolefins polypropylene
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • D10B2331/02—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2401/00—Physical properties
    • D10B2401/04—Heat-responsive characteristics
    • D10B2401/046—Shape recovering or form memory
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2505/00—Industrial
    • D10B2505/04—Filters

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Filtering Materials (AREA)

Abstract

A filter cloth (20) for a filter press is made of textured stretch yarn so as to afford a degree of built-in stretch and recovery to the cloth. The yarn may be synthetic plastics material, for example polypropylene or nylon, and may include a proportion of natural material. This enables the filter cloth to recover, at least partially, from distortion usually caused by cake built up during filtering. <IMAGE>

Description

SPECIFICATION A filter press cloth and filter press The present invention relates to a filter press cloth and to a recessed plate filter press incorporating such a cloth.
A filter press generally comprises a plurality of plates arranged in pairs. Filter cloths are disposed between the adjacent plates of each pair. Fluid inlet and outlet ducts are provided in the plates and fluid inlet and outlet apertures are provided in the filter cloths. The plates are clamped together with the cloths between them and fluid to be filtered, such as sewage sludge for example, is pumped in via the inlet ducts in the plates and inlet apertures in the cloths. The fluid drains through the filter cloths leaving a residue on the upstream side and then out of the press via the outlet ducts in the plates and outlet apertures in the cloths. Each plate is recessed on its face and the adjacent filter cloth is pressed into the recess by the pressure of the fluid thus stretching the cloth.At the end of a filter cycle, the plates are unclamped to release the cloths and to allow the caked residue to fall away from the cloths. This action may stretch the cloths even further. When the press is reassembled, if the stretch previously imparted to the cloths has not recovered, the cloths may not filter as efficiently as previously and it may be difficult to align the ducts in the plates with the apertures in the cloths. Further filtering cycles may serve to exacerbate these problems.
According to one aspect of the present invention, there is provided a filter cloth for a filter press the,or the major part of the, yarn of which is made of textured stretch yarn so as to afford a degree of built-in stretch and recovery to the cloth.
According to another aspect of the present invention there is provided a filter press comprising at least two plates, two filter cloth layers sandwiched between the plates, and means for clamping the plates together, the filter cloth being made of textured stretch yarn so as to afford a degree of built-in stretch and recovery to the cloth.
In order that the invention may be more clearly understood, one embodiment thereof will now be described, by way of example, with reference to the accompanying drawings, in which: Figure 1 shows a diagrammatic view of a filter press, Figure 2 shows a diagrammatic perspective view of one plate of a filter press of the type shown in Figure 1, Figure 3 shows a diagrammatic cross sectional view through part of a filter press of the type shown in Figure 1 comprising several pairs of plates of the type shown in Figure 1, Figure 4 shows a perspective view of a filter cloth for the press of Figure 1, and Figures 5a-e show a series of diagrammatic sketches relating to the cyclic nature of the operation of a filter press of the type shown in Figure 1.
Referring to Figures 1,2 and 3, a filter press comprises a plurality of plates 1, arranged in pairs, between a fixed abutment 2 and a movable abutment 3. This movable abuttment may be manually, electromechanically, or hydraulically urged against the fixed abuttment in order to clamp the plates and cloths tightly between them.
Each plate 1 (see Figure 3 in particular) is moulded from a rigid synthetic plastics material and each face 10 of the plate defines a shallow recess 11 extending over a substantial portion of the surface of the plate.
The base of each recess is patterned at 12 to provide a passage between cloth and plate for filtrate and the side 13 of the recess 11 is bevelled. Ducts 14 extend through the two lower corners of the plate. These ducts 14 communicate with the recesses via subsidiary ducts 15, These ducts 15 connect both recesses 11 to the ducts 14 on both left and right hand sides of the plate. Alternatively, the recess on one face 11 may be connected to the left hand duct 14 (say) and the recess 11 on the other face to the right hand duct 14. Ducts 14 at the upper edge of the plate may be provided in addition to, or instead of, the ducts 14 at the lower edge. The upper edge ducts 14 may also be connected to both recesses 11 or to respective ducts as with the lower edge ducts 14 again via subsidiary ducts 15. These additional ducts 14 and 15 are shown in dash dotted outline in Figure 3.Each plate also defines a centrally located duct 16 for the supply of fluid to be filtered. When the plates and their associated filter cloths are assembled, the composite duct 16 is aligned with a duct 17 extending through the fixed abuttment 2. This duct 17 is in turn connected to the fluid feed in which a pump 18 is disposed. A duct 19 connects the outlet duct 14 of the plate 1 to a drain or, via a bypass valve 19b and feedback duct 1 9a to the pump 18. This feedback enables fluid to be circulated through the press more than once.
Referring to Figure 4, each filter cloth comprises two rectangular leaves 21, 22 joined by a centrally disposed tubular portion 23. Apart from the apertures defining the entrance to and exit from the tubular portion 23 each rectangular leaf has apertures 24 which correspond to the ducts 12. (these corresponding to upper duct 14 are similarly shown in dash-dotted outline). The filter cloth is made from a yarn which is or the major part of which is made from textured stretch yarn in such a way as to give the cloth an improved but limited built-in stretch and recovery characteristics as compared with conventional filter cloths. The yarn may be made from nylon, polypropylene or any other suitable synthetic plastics material. It may include a proportion of a natural material yarn.
In use, in building up the press, filter cloths are pushed through the central apertures 16 of the corresponding plate 1 and their leaves 21 and 22 smoothed over respective faces of the plate. The plates are then placed between abuttments 2 and 3 and clamped together as shown in Figure 3. At the start of a pressing cycle the cloths are straight as shown at Son Figure 3 and in Figure 5a. Sludge is pumped to the assembly by pump 18. As a result of this pressurisation, the filter cloths 20 adopt the shape shown in Figure 5b as they are forced into respective recesses 11. As filtering progresses a cake 30 of filtered material builds up on the upstream side of the filter cloths 20 and the sludge flow rate drops.
At the end of the cycle, often an hour or more, the plates are unclamped to allow the cake to drop away.
This action tends to straighten the cloths and may impose an additional strain on them (see Figure 5c).
The nature of the cloth permits the cloth to recover thereafter and readopt the shape shown in Figure 5d in the next pressing cycle. If, however, the fabric of conventional design does not cover fully, it may adapt the shape shown in Figure 5e.
With the above mentioned system filter cloths may be employed for more pressing cycles than with conventional cloth. This results in considerable cost savings both directly and indirectly since the laborious task of replacing the cloths need not be undertaken so often.
It will be appreciated that the above embodiment has been described by way of example only and that many variations may be possible without departing from the scope of the invention. The plates 1 may be made from material otherthan plastics, such as metal, for example. When made of metal, for example cast iron, a coating or layer of plastics or rubber material may be provided to protect the metal and provide a better seal.

Claims (19)

1. A filter cloth for a filter press the, or the major part of the, yarn of which is made of textured stretch yarn so as to afford a degree of built-in stretch and recovery to the cloth.
2. A filter cloth as claimed in claim 1, in which the yarn is made from synthetic plastics material.
3. Afilter cloth as claimed in claim 2, in which the synthetic plastics material is polypropylene or nylon.
4. A filter cloth as claimed in claim 1, in which the yarn comprises a proportion of a natural material.
5. A filter press comprises at least two plates, two filter cloth layers sandwiched between the plates, and means for clamping the plates together, the filter cloth being made of textured stretch yarn so as to afford a degree of build-in stretch and recovery to the cloth.
6. A filter press as claimed in claim 5, in which more than two plates are provided and a pair of filter cloth layers are sandwiched between the plates of respective pairs of adjacent plates.
7. A filter press as claimed in claim 5 or 6, in which the yarn is made from synthetic plastics material.
8. Afilter press as claimed in claim 7, in which the synthetic plastics material is nylon.
9. A filter press as claimed in claim 5 or 6, in which the yarn comprises a proportion of a natural material.
10. A filter press as claimed in any of claims 5 to 9, in which those filter cloth layers disposed on opposite sides respectively of a plate are joined together to form a filter cloth.
11. A filter press as claimed in claim 10, in which the filter cloth layers are joined together through an aperture in the respective plates, which aperture provides a passage for fluid to be filtered.
12. A filter press as claimed in claim 11, in which the joint between layers is in the form of a tube through which fluid to be filtered is introduced into spaces between plates.
13. A filter press as claimed in any of claims 5 to 12, in which each face of each plate is recessed.
14. Afilter press as claimed in claim 13, in which the base of each recess is patterned to provide a passage between base and adjacent filter cloth layer for filtrate.
15. A filter press as claimed in any of claims 5 to 14, in which ducts are provided in each plate for the passage of filtrate.
16. A filter press as claimed in any of claims 5 to 15, in which a pump is provided for the supply of fluid.
17. Afilter press as claimed in any of claims 5 to 16, in which a feedback is provided for the recirculation of filtrate through the press.
18. A filter cloth for a filter press substantially as hereinbefore described with reference to the accompanying drawings.
19. A filter press substantially as hereinbefore described with reference to the accompanying drawings.
GB08419468A 1983-08-04 1984-07-31 A filter press cloth and filter press Expired GB2146545B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB838321090A GB8321090D0 (en) 1983-08-04 1983-08-04 Filter press cloth

Publications (3)

Publication Number Publication Date
GB8419468D0 GB8419468D0 (en) 1984-09-05
GB2146545A true GB2146545A (en) 1985-04-24
GB2146545B GB2146545B (en) 1987-09-09

Family

ID=10546832

Family Applications (2)

Application Number Title Priority Date Filing Date
GB838321090A Pending GB8321090D0 (en) 1983-08-04 1983-08-04 Filter press cloth
GB08419468A Expired GB2146545B (en) 1983-08-04 1984-07-31 A filter press cloth and filter press

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB838321090A Pending GB8321090D0 (en) 1983-08-04 1983-08-04 Filter press cloth

Country Status (1)

Country Link
GB (2) GB8321090D0 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996024423A1 (en) * 1995-02-09 1996-08-15 Scapa Group Plc Filtration apparatus
DE202011005390U1 (en) * 2011-04-20 2014-07-04 Ludwig Mayer filter cloth
EP1232780B2 (en) † 2001-02-20 2014-10-29 Sefar AG Filtercloth

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB688906A (en) * 1949-11-12 1953-03-18 John Stanley Heath Improvements in cloths for filter presses
GB756584A (en) * 1954-02-06 1956-09-05 British Nylon Spinners Ltd Process for dyeing and crimping continuous filamentary yarns
GB852133A (en) * 1955-11-02 1960-10-26 Deering Milliken Res Corp Elastic or stretch yarns and fabrics and methods of production thereof
GB1102140A (en) * 1965-11-19 1968-02-07 Shriver & Company Inc T Filter press
GB1118383A (en) * 1966-01-08 1968-07-03 Chemokomplex Vegyipari Gep Es Filtering apparatus and method
GB1231538A (en) * 1969-04-17 1971-05-12
GB1459099A (en) * 1973-12-05 1976-12-22 Heath Son Ltd G H Cloths for filter presses

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB688906A (en) * 1949-11-12 1953-03-18 John Stanley Heath Improvements in cloths for filter presses
GB756584A (en) * 1954-02-06 1956-09-05 British Nylon Spinners Ltd Process for dyeing and crimping continuous filamentary yarns
GB852133A (en) * 1955-11-02 1960-10-26 Deering Milliken Res Corp Elastic or stretch yarns and fabrics and methods of production thereof
GB1102140A (en) * 1965-11-19 1968-02-07 Shriver & Company Inc T Filter press
GB1118383A (en) * 1966-01-08 1968-07-03 Chemokomplex Vegyipari Gep Es Filtering apparatus and method
GB1231538A (en) * 1969-04-17 1971-05-12
GB1459099A (en) * 1973-12-05 1976-12-22 Heath Son Ltd G H Cloths for filter presses

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996024423A1 (en) * 1995-02-09 1996-08-15 Scapa Group Plc Filtration apparatus
EP1232780B2 (en) † 2001-02-20 2014-10-29 Sefar AG Filtercloth
DE202011005390U1 (en) * 2011-04-20 2014-07-04 Ludwig Mayer filter cloth

Also Published As

Publication number Publication date
GB8419468D0 (en) 1984-09-05
GB8321090D0 (en) 1983-09-07
GB2146545B (en) 1987-09-09

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PCNP Patent ceased through non-payment of renewal fee