GB2175222A - Filtering screen - Google Patents

Filtering screen Download PDF

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Publication number
GB2175222A
GB2175222A GB08613923A GB8613923A GB2175222A GB 2175222 A GB2175222 A GB 2175222A GB 08613923 A GB08613923 A GB 08613923A GB 8613923 A GB8613923 A GB 8613923A GB 2175222 A GB2175222 A GB 2175222A
Authority
GB
United Kingdom
Prior art keywords
meshes
screen
mesh
support
filtering
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
GB08613923A
Other versions
GB2175222B (en
GB8613923D0 (en
Inventor
Marshall Graham Bailey
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.)
Thule United Ltd
Original Assignee
Thule United 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
Priority claimed from GB848418658A external-priority patent/GB8418658D0/en
Application filed by Thule United Ltd filed Critical Thule United Ltd
Priority to GB8613923A priority Critical patent/GB2175222B/en
Publication of GB8613923D0 publication Critical patent/GB8613923D0/en
Publication of GB2175222A publication Critical patent/GB2175222A/en
Application granted granted Critical
Publication of GB2175222B publication Critical patent/GB2175222B/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
    • B07B1/4663—Multi-layer screening surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
    • B01D29/012—Making filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
    • B01D29/05—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements supported
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
    • B01D29/52—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
    • B01D29/56—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/70—Regenerating the filter material in the filter by forces created by movement of the filter element
    • B01D29/72—Regenerating the filter material in the filter by forces created by movement of the filter element involving vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/10—Filter screens essentially made of metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/10—Filter screens essentially made of metal
    • B01D39/12—Filter screens essentially made of metal of wire gauze; of knitted wire; of expanded metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
    • B07B1/4672—Woven meshes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/48—Stretching devices for screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/50—Cleaning

Landscapes

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

Abstract

A filtering screen comprises a first filter mesh, a second filter mesh having a different mesh size from the first and overlying the first mesh, and an apertured support to which both of the meshes are bonded so as to maintain the two meshes in tension, the tension in one of the meshes being greater than that in the other. At least one other filter mesh may be bonded over the first two meshes. The support comprises a rectilinear frame 64,66,72 divided by transverse bars 68 and reinforced by additional rods (70). The screen is used in a vibrating screening machine. <IMAGE>

Description

SPECIFICATION Improvements in filtering screens Field of the invention This invention relates to a screen for use in a filtering process, especially for filtering a particlecontaining suspension or a slurry.
Background to the invention Commonly, in filtering processes generally of the kind referred to, a plurality of differently-sized mesh filter elements are mounted one above the other in a vibratory cradle or the like. Each wire mesh screen may be tensioned across the cradle by use of fixing hooks. Alternatively, each single mesh screen may be mounted and possibly stretched within a screen insertable into the cradle.
Object of the invention It is an object of this invention to provide an improved filtering screen, for example a filtering screen which can usefully be employed in a vibratory cradle.
Summary of the invention According to one aspect of the present invention, a filtering screen comprises: a) a first filter mesh, b) a second filter mesh having a different mesh size from the first and overlying the first mesh, and c) an apertured support to which the meshes are bonded so as to maintain the two meshes in tension, the tension in one of the meshes being greater than that in the other, wherein d) the screen support is in the form of a rectilinear frame of rigid supports similar to a picture frame with transversely extending intermediate struts to define apertures within the frame.
The invention is not limited to the use of only two screen meshes and additional meshes having the same or different mesh size and having the same or different tension may be incorporated by bonding over the first two mentioned meshes.
By incorporating a rigid apertured support and bonding the meshes to the support, so differential tensions within the meshes can be maintained and the meshes are kept flat even under load thereby preventing migration of slurry and uneven distribution across the screen.
Where meshes or cloths are to be secured to an apertured support as aforesaid, the bonding may be achieved using a thermosetting adhesive, a chemically setting adhesive, or by fusion where the rigid support is of an appropriate material such as a plastics material.
There is no limitation on the material which can be used for the rigid screen support. Thus for example any of wood, steel, plastics or a composite material including fibres for reinforcement may be used, or any combination thereof.
As is known, the use of two meshes of differing tension overlying one another enables the screen to be self-cleaning. By providing a rigid support to which the meshes or filter cloths are bonded, the self-cleaning aspect of the invention is enhanced since the meshes or screen cloths do not need to be tensioned to the same extent as is the case if they are to be self supporting.
In one embodiment of the invention a polyester is used to bond the mesh to a relatively rigid support of glass reinforced plastics material.
The support preferably has a regular pattern of apertures.
The meshes or screen cloths are preferably formed from woven wire.
Typical mesh sizes are 12 wires per cm (30 wires per inch) and 60 wires per cm (150 wires per inch), the coarser mesh always being the mesh which is in contact with the support and the finer mesn (60 wires per cm) being secured over the coarser mesh.
Bonding of the meshes to the support may be aided by the application of heat and pressure applied by a press or by means of rollers.
The differential tensioning imparted during bonding allows one mesh to flap against the other during vibration so as to render the screen selfcleaning.
Description of drawings The invention will now be described, by way of example, with reference to the accompanying drawings, in which: Figure 1 illustrates in perspective part of a practical embodiment of screen support; and Figure 2 is a cross-section through Figure 1 on the line 2-2.
Detailed description of drawings In Figure 1 a screen support is shown comprising angled members 64 and 66 between which extend rigid bars such as 68, typically welded at their ends. As shown in Figure 2 each bar is cut away on its underside to accommodate transversely extending rods such as 70. Also as shown in Figure 2, the upper surface of the bars 68 and the out turned flanges of the members 64 and 66 are coplanar and two or more meshes typically of woven wire as at 71 can be stretched over the frame and secured to the coplanar surfaces of the members 64, 66 and 68 using a suitable adhesive.
The frame may be completed by means of members such as 72 which again may be welded or otherwise secured to the side struts 64 and 66.
The screen described herein is intended to be firmly clamped in a vibratory screening machine, in use.
1. A filtering screen comprising: a) a first filter mesh, b) a second filter mesh having a different mesh size from the first and overlying the first mesh, and c) an apertured support to which the meshes are bonded so as to maintain the two meshes in tension, the tension in one of the means being greater than that in the other, wherein d) the screen support is in the form of a recti
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (10)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Improvements in filtering screens Field of the invention This invention relates to a screen for use in a filtering process, especially for filtering a particlecontaining suspension or a slurry. Background to the invention Commonly, in filtering processes generally of the kind referred to, a plurality of differently-sized mesh filter elements are mounted one above the other in a vibratory cradle or the like. Each wire mesh screen may be tensioned across the cradle by use of fixing hooks. Alternatively, each single mesh screen may be mounted and possibly stretched within a screen insertable into the cradle. Object of the invention It is an object of this invention to provide an improved filtering screen, for example a filtering screen which can usefully be employed in a vibratory cradle. Summary of the invention According to one aspect of the present invention, a filtering screen comprises: a) a first filter mesh, b) a second filter mesh having a different mesh size from the first and overlying the first mesh, and c) an apertured support to which the meshes are bonded so as to maintain the two meshes in tension, the tension in one of the meshes being greater than that in the other, wherein d) the screen support is in the form of a rectilinear frame of rigid supports similar to a picture frame with transversely extending intermediate struts to define apertures within the frame. The invention is not limited to the use of only two screen meshes and additional meshes having the same or different mesh size and having the same or different tension may be incorporated by bonding over the first two mentioned meshes. By incorporating a rigid apertured support and bonding the meshes to the support, so differential tensions within the meshes can be maintained and the meshes are kept flat even under load thereby preventing migration of slurry and uneven distribution across the screen. Where meshes or cloths are to be secured to an apertured support as aforesaid, the bonding may be achieved using a thermosetting adhesive, a chemically setting adhesive, or by fusion where the rigid support is of an appropriate material such as a plastics material. There is no limitation on the material which can be used for the rigid screen support. Thus for example any of wood, steel, plastics or a composite material including fibres for reinforcement may be used, or any combination thereof. As is known, the use of two meshes of differing tension overlying one another enables the screen to be self-cleaning. By providing a rigid support to which the meshes or filter cloths are bonded, the self-cleaning aspect of the invention is enhanced since the meshes or screen cloths do not need to be tensioned to the same extent as is the case if they are to be self supporting. In one embodiment of the invention a polyester is used to bond the mesh to a relatively rigid support of glass reinforced plastics material. The support preferably has a regular pattern of apertures. The meshes or screen cloths are preferably formed from woven wire. Typical mesh sizes are 12 wires per cm (30 wires per inch) and 60 wires per cm (150 wires per inch), the coarser mesh always being the mesh which is in contact with the support and the finer mesn (60 wires per cm) being secured over the coarser mesh. Bonding of the meshes to the support may be aided by the application of heat and pressure applied by a press or by means of rollers. The differential tensioning imparted during bonding allows one mesh to flap against the other during vibration so as to render the screen selfcleaning. Description of drawings The invention will now be described, by way of example, with reference to the accompanying drawings, in which: Figure 1 illustrates in perspective part of a practical embodiment of screen support; and Figure 2 is a cross-section through Figure 1 on the line 2-2. Detailed description of drawings In Figure 1 a screen support is shown comprising angled members 64 and 66 between which extend rigid bars such as 68, typically welded at their ends. As shown in Figure 2 each bar is cut away on its underside to accommodate transversely extending rods such as 70. Also as shown in Figure 2, the upper surface of the bars 68 and the out turned flanges of the members 64 and 66 are coplanar and two or more meshes typically of woven wire as at 71 can be stretched over the frame and secured to the coplanar surfaces of the members 64, 66 and 68 using a suitable adhesive. The frame may be completed by means of members such as 72 which again may be welded or otherwise secured to the side struts 64 and 66. The screen described herein is intended to be firmly clamped in a vibratory screening machine, in use. CLAIMS
1. A filtering screen comprising: a) a first filter mesh, b) a second filter mesh having a different mesh size from the first and overlying the first mesh, and
c) an apertured support to which the meshes are bonded so as to maintain the two meshes in tension, the tension in one of the means being greater than that in the other, wherein d) the screen support is in the form of a recti linear frame of rigid supports similar to a picture frame with transversely extending intermediate struts to define apertures within the frame.
2. A filtering screen as claimed in claim 1, in which at least one other filter mesh is bonded over the first two meshes.
3. A filtering screen as claimed in claim 1 or claim 2, wherein the bonding agent is a thermosetting adhesive or a chemically setting adhesive.
4. A filtering screen comprising: support constituted by a rectilinear structure defining an outer frame and intermediate struts defining apertures within the frame, a first filter mesh, a second filter mesh having a different mesh size from the first and overlying the first mesh, wherein the meshes are bonded to the support so as to maintain the meshes in tension, with the tension in one mesh greater than that in the other.
5. A filtering screen as claimed in claim 4, wherein the support has longitudinal outer frame members, transversely extending intermediate bars, and longitudinally extending intermediate rods assisting rigidity.
6. A filtering screen as claimed in claim 5, wherein the side members and intermediate bars have coplanar upper surfaces and the at least two meshes are stretched over the frame and bonded to said coplanar surfaces with the required differential tensions.
7. A filtering screen as claimed in claim 5 or claim 6, wherein the longitudinal side members comprise angled members providing upper surfaces of substantial area to which the meshes are bonded.
8. A filtering screen as claimed in claim 7, wherein the outer frame is completed by transverse angled members secured to the longitudinal angled members, said transverse angled members also providing upper surfaces of substantial area.
9. A filtering screen as claimed in claim 5 or any claim appendant to claim 5, wherein the intermediate rods are accommodated in aligned cut away regions on the undersides of the transversely extending intermediate bars.
10. A filtering screen substantially as hereinbefore described with reference to the accompanying drawings.
GB8613923A 1984-07-21 1986-06-09 Improvements in filtering screens Expired GB2175222B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8613923A GB2175222B (en) 1984-07-21 1986-06-09 Improvements in filtering screens

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB848418658A GB8418658D0 (en) 1984-07-21 1984-07-21 Filtering screens
GB8613923A GB2175222B (en) 1984-07-21 1986-06-09 Improvements in filtering screens

Publications (3)

Publication Number Publication Date
GB8613923D0 GB8613923D0 (en) 1986-07-16
GB2175222A true GB2175222A (en) 1986-11-26
GB2175222B GB2175222B (en) 1989-04-26

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Family Applications (1)

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GB8613923A Expired GB2175222B (en) 1984-07-21 1986-06-09 Improvements in filtering screens

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2245191A (en) * 1990-06-22 1992-01-02 United Wire Ltd Filter screen assembly
US5392925A (en) * 1993-08-12 1995-02-28 Environmental Procedures, Inc. Shale shaker and screen
EP0782887A2 (en) * 1994-03-03 1997-07-09 United Wire Limited Improved sifting screen
US5988645A (en) * 1994-04-08 1999-11-23 Downing; Dennis L. Moving object monitoring system
AU728958B2 (en) * 1997-12-15 2001-01-25 New Clear Water Pty Ltd Apparatus for use as a disposal field
WO2001068218A1 (en) * 2000-03-11 2001-09-20 United Wire Limited Filtering screens for vibratory separation equipment
US6412644B1 (en) 2000-11-17 2002-07-02 Varco I/P, Inc. Vibratory separator
WO2003041878A1 (en) * 2001-11-10 2003-05-22 United Wire Ltd Sifting screen
US6581781B1 (en) 1993-04-30 2003-06-24 Tuboscope I/P, Inc. Vibrator separator screens
US7000777B2 (en) 1998-10-30 2006-02-21 Varco I/P, Inc. Vibratory separator screens
US7011218B2 (en) 2003-08-29 2006-03-14 Derrick Corporation Vibratory screen assemblies
CN101249493B (en) * 2008-03-27 2012-05-23 中国矿业大学 Mosaic type elastic compound sieve plate
WO2020011366A1 (en) * 2018-07-12 2020-01-16 Sandvik Srp Ab Screening module and method of manufacturing the screen module
US10646799B2 (en) 2008-06-10 2020-05-12 Ibs Filtran Kunststoff-/Metallerzeugnisse Gmbh Filter medium for an oil filter

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6607080B2 (en) 1993-04-30 2003-08-19 Varco I/P, Inc. Screen assembly for vibratory separators
US6629610B1 (en) 1993-04-30 2003-10-07 Tuboscope I/P, Inc. Screen with ramps for vibratory separator system
US6450345B1 (en) 1993-04-30 2002-09-17 Varco I/P, Inc. Glue pattern screens and methods of production
US6283302B1 (en) 1993-08-12 2001-09-04 Tuboscope I/P, Inc. Unibody screen structure
US6736270B2 (en) 1998-10-30 2004-05-18 Varco I/P, Inc. Glued screens for shale shakers
US6669985B2 (en) 1998-10-30 2003-12-30 Varco I/P, Inc. Methods for making glued shale shaker screens

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1578948A (en) * 1977-10-26 1980-11-12 United Wire Group Ltd Sifting screens

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1578948A (en) * 1977-10-26 1980-11-12 United Wire Group Ltd Sifting screens

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2245191A (en) * 1990-06-22 1992-01-02 United Wire Ltd Filter screen assembly
AU639117B2 (en) * 1990-06-22 1993-07-15 United Wire Limited Filter screen assembly
GB2245191B (en) * 1990-06-22 1994-01-26 United Wire Ltd Filter screen assembly
EP0535046B1 (en) * 1990-06-22 1994-09-21 United Wire Limited Filter screen and method for repairing it
US6581781B1 (en) 1993-04-30 2003-06-24 Tuboscope I/P, Inc. Vibrator separator screens
US5392925A (en) * 1993-08-12 1995-02-28 Environmental Procedures, Inc. Shale shaker and screen
EP0782887A3 (en) * 1994-03-03 1997-07-23 United Wire Limited Improved sifting screen
EP0782887A2 (en) * 1994-03-03 1997-07-09 United Wire Limited Improved sifting screen
US5988645A (en) * 1994-04-08 1999-11-23 Downing; Dennis L. Moving object monitoring system
AU728958B2 (en) * 1997-12-15 2001-01-25 New Clear Water Pty Ltd Apparatus for use as a disposal field
AU728958C (en) * 1997-12-15 2004-02-19 New Clear Water Pty Ltd Apparatus for use as a disposal field
US7000777B2 (en) 1998-10-30 2006-02-21 Varco I/P, Inc. Vibratory separator screens
WO2001068218A1 (en) * 2000-03-11 2001-09-20 United Wire Limited Filtering screens for vibratory separation equipment
US6825136B2 (en) 2000-03-11 2004-11-30 United Wire Limited Filtering screens for vibratory separation equipment
US6412644B1 (en) 2000-11-17 2002-07-02 Varco I/P, Inc. Vibratory separator
EP1518610A2 (en) * 2001-11-10 2005-03-30 United Wire Limited Sifting screen
EP1518610A3 (en) * 2001-11-10 2005-04-06 United Wire Limited Sifting screen
WO2003041878A1 (en) * 2001-11-10 2003-05-22 United Wire Ltd Sifting screen
US7011218B2 (en) 2003-08-29 2006-03-14 Derrick Corporation Vibratory screen assemblies
US7175028B2 (en) 2003-08-29 2007-02-13 Derrick Corporation Vibratory screen assemblies
CN101249493B (en) * 2008-03-27 2012-05-23 中国矿业大学 Mosaic type elastic compound sieve plate
US10646799B2 (en) 2008-06-10 2020-05-12 Ibs Filtran Kunststoff-/Metallerzeugnisse Gmbh Filter medium for an oil filter
WO2020011366A1 (en) * 2018-07-12 2020-01-16 Sandvik Srp Ab Screening module and method of manufacturing the screen module

Also Published As

Publication number Publication date
GB2175222B (en) 1989-04-26
GB8613923D0 (en) 1986-07-16

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Effective date: 20050714