WO2001039861A1 - A method of making a screen, a screen, and a system for making a screen - Google Patents
A method of making a screen, a screen, and a system for making a screen Download PDFInfo
- Publication number
- WO2001039861A1 WO2001039861A1 PCT/GB2000/004615 GB0004615W WO0139861A1 WO 2001039861 A1 WO2001039861 A1 WO 2001039861A1 GB 0004615 W GB0004615 W GB 0004615W WO 0139861 A1 WO0139861 A1 WO 0139861A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- roller
- glue
- screen
- layers
- screening material
- Prior art date
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 239000003292 glue Substances 0.000 claims abstract description 73
- 238000000034 method Methods 0.000 claims abstract description 66
- 239000000463 material Substances 0.000 claims abstract description 33
- 238000012216 screening Methods 0.000 claims abstract description 32
- 238000003825 pressing Methods 0.000 claims abstract description 10
- 239000011324 bead Substances 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 4
- 239000002826 coolant Substances 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 239000012943 hotmelt Substances 0.000 claims description 2
- 230000001419 dependent effect Effects 0.000 claims 9
- 238000010438 heat treatment Methods 0.000 claims 3
- 239000007787 solid Substances 0.000 description 14
- 239000002245 particle Substances 0.000 description 11
- 238000005553 drilling Methods 0.000 description 9
- 239000004744 fabric Substances 0.000 description 5
- 238000004026 adhesive bonding Methods 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- -1 polytetrafluorethylene Polymers 0.000 description 3
- 238000005065 mining Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000011195 cermet Substances 0.000 description 1
- 239000010724 circulating oil Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- B07B1/4618—Manufacturing of 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
- B01D29/62—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
- 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
- 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
- B07B2201/00—Details applicable to machines for screening using sieves or gratings
- B07B2201/02—Fastening means for fastening screens to their frames which do not stretch or sag the screening surfaces
Definitions
- Drilling mud typically a mixture of clay, water and various additives
- Drilling mud is pumped down through a hollow drill string (pipe, drill collar, bit, etc.) into a well being drilled and exits through holes in the drill bit.
- the mud picks up cuttings (rock) and other solids from the well and carries them upwardly away from the bit and out of the well in a space between the well walls and the drill string.
- the solids-laden mud is discharged over a shale shaker, a device which typically has a series of screens arranged in tiered or flat disposition with respect to each other.
- a vibrating screen may be formed from one or more layers of wire mesh.
- Wire mesh is generally described with reference to the diameter of the wires from which it is woven, the number wires per unit length (called the mesh count) and the shape or size of the openings between wires .
- Wire mesh comes in various grades . "Market” grade mesh generally has wires of relative large diameter. "Mill” grade has comparatively smaller diameter wires and “bolting cloth” has the smallest diameter wire. The type of mesh chosen depends on the application. Smaller diameter wires have less surface and thus less drag, resulting in greater flow rates. Smaller diameter wires also result, for a given opening size, in a larger percentage of open area over the total area of the screen, thus allowing greater flow rates and increased capacity.
- screens of bolting cloth tear more easily than market or mill grade screens, especially when used in harsh conditions such as drilling and mining operations .
- the smaller diameter wires tend to have less tensile strength and break more easily, and the finer mesh also tends not to retain its shape well .
- Most meshes suffer from what is termed “near sized particle blinding".
- wires separate enough to allow particles of substantially the same size or slightly larger than the openings to fall between the wires and become lodged, thus “blinding" the openings of the screen and reducing capacity of the screen . If a particle becomes lodged when the wires are at their maximum distance apart, it is almost impossible to dislodge the particle. Sometimes, however, wires will subsequently separate further to release the lodged particle.
- 4,033,865 describes layering two meshes in a manner that results in at least one wire of the lower of the two meshes bisecting each opening in the upper mesh.
- the openings in each mesh are at least twice as wide as the diameters of the wires and the lower mesh has openings the same size as or slightly larger than the openings in the upper mesh.
- the lower mesh when held tightly against the upper mesh, prevents particles from migrating far enough into an opening in the upper mesh to be trapped. Some relative movement of the layers also helps to dislodge particles caught in the upper layer.
- the two-layer arrangement has the further benefit of a finer "cutting point," allowing smaller particles to be separated out.
- a third "backing" layer of relatively coarse, mill grade mesh is often used to carry most of the load on the screen and to increase the tensile strength of the screen.
- a torn screen must be replaced or repaired.
- the screen layers are bonded to a rigid or semi-rigid support panel that has a pattern of large openings , forming on the screen a plurality of small cells of wire mesh.
- the mesh remaining within the cell in which the tear occurred is cut out and the cell is plugged.
- the capacity of the screen is diminished but its life is extended.
- several cells of a screen can be repaired before its capacity drops far enough to require replacement.
- bonding the screen to the support panel further restricts relative movement of the layers and the wires in each mesh layer, thus compounding the problem of blinding .
- the present invention provides a method for making a screen assembly for a vibratory separator, the method comprising the steps of placing at least two layers of screening material one on top of the other, introducing glue to one of the at least two layers of screening material for adhering at least portions of them together, said glue introduced to one of the at least two layers of screening material from a roller with a patterned surface thereon such that the amount of glue is introduced to the at least two layers of screening material in a pattern substantially corresponding to said patterned surface of the roller.
- the invention also relates to a screen made by the method and to a system for making a screen in accordance with the method.
- the invention also relates to a screen made by the above method and to a system for making a screen in accordance with the method.
- Figure 1 is a side schematic view of a first embodiment of an apparatus for making screens in accordance with the present invention, indicating steps in a method of making screens in accordance the present invention ;
- FIG 3 is an enlarged side view of an alternative roller apparatus for use in the apparatus as shown in Figures 1 or 2 ;
- Figure 4A is an enlarged front view of part of a pattern roller for apparatus as in Figure 1 ;
- Figure 5B is a side view of the roller of Figure 5A;
- Figure 6A is an end view of a second embodiment of pattern roller ;
- Figure 6B is a side view of the roller of Figure 6A;
- Figures 7 and 8 are side views of alternative pattern rollers ;
- Figure 9 is a top view of a screen in accordance with the present invention.
- Figure 10 is a top view of a screen in accordance with the present invention with parts cut-away; and
- FIG. 1 shows a system 100 according to the present invention for making a screen 2 according to the present invention by a method according to the present invention .
- the system 100 produces a screen 2 which includes a lower coarse mesh or screen 4 , an intermediate mesh or screen 6 , and a top mesh or screen 8. Any one of these meshes (or screens) 4, 6, 8 may be omitted. Alternatively one or more additional mesh layers may be added.
- the coarse mesh 4 is initially wound on a roller 11 from which it is unwound and passes over a rotating roller 13. From the roller 13 the coarse mesh moves to a position beneath a gluing station 20 where glue in a pattern is applied on the coarse mesh 4.
- the coarse mesh is 19 mesh made of wire with a diameter of about 0.32cm (0.126 inches) .
- a pattern roller 30 applies a layer of glue in a desired pattern onto the coarse mesh 4.
- Glue 40 from a reservoir/manifold 50 flows to a space forming a "pond" of glue between a first roller 15 and a transfer roller 17. Either or both of these rollers may be a heated roller.
- hot air from an optional heater H may be blown at the roller (s) and/or at the "pond", and/or it may heat the glue in the reservoir/manifold 50.
- the transfer roller 17 rotates counter-clockwise as viewed in Figure 1 and the first roller 15 rotates clockwise; thus a film of glue is deposited on the outer surface of the transfer roller 17 which film, in turn, contacts parts of a pattern in or on an outer surface of the pattern roller 30 which rotates clockwise as viewed in Figure 1.
- the film on the pattern parts of the pattern roller 30 is applied in the pattern onto the coarse mesh 4 moving beneath the pattern roller 30.
- glue is applied on top of a combination of two , three , or more meshes prior to entering between the rollers 61 (rather than on top of the coarse mesh when it comes off the roll 11) .
- the glue is applied only to the mesh from either the roll 9 or the roll 7.
- the coarse mesh 4 with glue thereon in a desired pattern determined by the pattern on the pattern roller 30 advances to a pressing station 60.
- the intermediate mesh 6 is fed between rollers 61 and 62 of the pressing station 60 from a roll 7 as is the top mesh 8 from a roll 9.
- a fine mesh is unwound from the roll 111 and fine, finer, or coarse mesh or meshes are unwound from the rolls 107 and 109.
- the glue 40, 140 may be any suitable glue, including, but not limited to, polyethylene glues and hot melt glues at a suitable temperature for flowing to and from a reservoir/manifold and onto a mesh, for example, but not limited to at about 121°C (250°F) , between 121°C (250°F) and 204°C (400°F) , or at other suitable temperatures for the particular glue being used.
- Figures 5A and 5B show a pattern roller 80 useful as the pattern roller 30 of the system 100 in Figure 1. Raised portions 81 on an exterior surface 82 of the pattern roller 80 form the desired pattern for applying glue to a mesh.
- the roller 80 is solid with end shafts 83 for mounting to suitable supports for rotation.
- Figures 7 and 8 present pattern rollers with patterns or raised portions different from that of the patterns of the rollers of Figures 5B and 6B .
- the rollers of Figures 7 and 8 may have any of the options of the rollers of Figures 5B and 6B (including, but not limited to end shafts 83 and bore 84 , or a perforated tube structure) .
- a roller 85 in Figure 7 has raised lines 86 that define a pattern across the roller.
- a roller 87 in Figure 8 has raised portions 88 and 89 that define a pattern across the roller.
- Figure 9 shows a screen 90 produced with a system like the system 100 of Figure 1, using a roller like the roller 85 of Figure 7.
- Figure 10 shows a screen 92 with a glue layer 93 according to the present invention produced with a system like the system 100 of Figure 1 using a roller like the roller 87 of Figure 8.
- the screen 92 is like the screens disclosed in U.S. Patent 4,575,421 (incorporated fully herein for all purposes), but made with a system according to the present invention and by a method according to the present invention.
- the screen 92 has three layers of mesh or screening material 56, 57 and 58 and a lower perforated plate 54. Any of the layers of mesh may be omitted and the glue 93 may be applied on top of any of the layers .
- Figure 4A shows an enlargement of part of a pattern roller 96 which is similar to the roller 80 of Figure 5B, but which has valleys, recesses or grooves 97 in raised portions 98 of the roller. Glue is received within the grooves 97 so that a relatively higher or thicker level or bead of glue is applied to a mesh by the roller as compared to the layer or film of glue applied by a roller like the roller 80. Any raised portion of any roller disclosed herein may include such a valley recess, or groove to increase the amount of glue applied on a mesh.
- FIG. 4B shows a cross-section of one glue bead's B profile applied to a screen S with a pattern roller having grooves in raised portions of the pattern.
- the distance "a” is, in this embodiment, about 0.16cm (one-sixteenth of an inch) .
- the distance "b" is as thin as possible.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Laminated Bodies (AREA)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002382705A CA2382705A1 (en) | 1999-12-04 | 2000-12-04 | A method of making a screen, a screen, and a system for making a screen |
AU18707/01A AU1870701A (en) | 1999-12-04 | 2000-12-04 | A method of making a screen, a screen, and a system for making a screen |
EP00981470A EP1242158A1 (en) | 1999-12-04 | 2000-12-04 | A method of making a screen, a screen, and a system for making a screen |
NO20022119A NO20022119D0 (no) | 1999-12-04 | 2002-05-03 | Fremgangsmåte for å lage en sikt, en sikt og et system for å lage en sikt |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US45472299A | 1999-12-04 | 1999-12-04 | |
US09/454,722 | 1999-12-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001039861A1 true WO2001039861A1 (en) | 2001-06-07 |
Family
ID=23805804
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2000/004615 WO2001039861A1 (en) | 1999-12-04 | 2000-12-04 | A method of making a screen, a screen, and a system for making a screen |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1242158A1 (no) |
AU (1) | AU1870701A (no) |
CA (1) | CA2382705A1 (no) |
NO (1) | NO20022119D0 (no) |
WO (1) | WO2001039861A1 (no) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003033102A1 (en) * | 2001-10-19 | 2003-04-24 | Varco I/P, Inc. | A method of making a screen for a vibratory separator, a screen and an apparatus for making a screen |
WO2003061856A1 (en) * | 2002-01-16 | 2003-07-31 | Varco I/P, Inc. | Screen assembly and method for screening |
WO2003072344A1 (en) * | 2002-02-26 | 2003-09-04 | Sca Hygiene Products Ab | Method and device for producing a multi-ply web of flexible material, such as paper and nonwoven, and multi-ply material and product produced by the method |
WO2003072345A1 (en) * | 2002-02-26 | 2003-09-04 | Sca Hygiene Products Ab | Method and device for producing a multi-ply web of flexible material, such as paper and nonwoven, and multi-ply material produced by the method |
WO2004011160A1 (en) * | 2002-07-31 | 2004-02-05 | Varco I/P, Inc. | Method for making a screen for a vibratory separator |
WO2004022252A1 (en) * | 2002-09-05 | 2004-03-18 | Varco I/P, Inc. | A method for making a screen assembly for a vibratory separator |
WO2004056560A1 (en) * | 2002-12-19 | 2004-07-08 | Sca Hygiene Products Ab | Method and device for producing a multi-ply printed web of flexible material, such as paper and nonwoven, and multi-ply material produced by the method |
WO2005014187A2 (en) | 2003-07-25 | 2005-02-17 | Varco I/P, Inc. | Apparatus and method for making screen assemblies for vibratory separators |
US7153385B2 (en) | 2002-12-19 | 2006-12-26 | Sca Hygiene Products Ab | Method and device for producing a multi-ply printed web of flexible material, such as paper and nonwoven, and multi-ply material produced by the method |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4575421A (en) * | 1984-03-08 | 1986-03-11 | Derrick Manufacturing Corporation | Non-clogging wear-reducing screen assembly for vibrating screening machine |
WO1995017942A2 (de) * | 1993-12-30 | 1995-07-06 | Detroit Holding Limited | Verfahren zur herstellung eines fluidfilters |
GB2312858A (en) * | 1996-05-10 | 1997-11-12 | William Myron Cravello | Shaker screen assembly |
US5858091A (en) * | 1995-09-04 | 1999-01-12 | Windmoller & Holscher | Device for applying adhesives |
-
2000
- 2000-12-04 WO PCT/GB2000/004615 patent/WO2001039861A1/en not_active Application Discontinuation
- 2000-12-04 AU AU18707/01A patent/AU1870701A/en not_active Abandoned
- 2000-12-04 CA CA002382705A patent/CA2382705A1/en not_active Abandoned
- 2000-12-04 EP EP00981470A patent/EP1242158A1/en not_active Withdrawn
-
2002
- 2002-05-03 NO NO20022119A patent/NO20022119D0/no not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4575421A (en) * | 1984-03-08 | 1986-03-11 | Derrick Manufacturing Corporation | Non-clogging wear-reducing screen assembly for vibrating screening machine |
WO1995017942A2 (de) * | 1993-12-30 | 1995-07-06 | Detroit Holding Limited | Verfahren zur herstellung eines fluidfilters |
US5858091A (en) * | 1995-09-04 | 1999-01-12 | Windmoller & Holscher | Device for applying adhesives |
GB2312858A (en) * | 1996-05-10 | 1997-11-12 | William Myron Cravello | Shaker screen assembly |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7000777B2 (en) | 1998-10-30 | 2006-02-21 | Varco I/P, Inc. | Vibratory separator screens |
WO2003033102A1 (en) * | 2001-10-19 | 2003-04-24 | Varco I/P, Inc. | A method of making a screen for a vibratory separator, a screen and an apparatus for making a screen |
WO2003061856A1 (en) * | 2002-01-16 | 2003-07-31 | Varco I/P, Inc. | Screen assembly and method for screening |
GB2399042B (en) * | 2002-01-16 | 2006-11-29 | Varco Int | Screen assembly and method for screening |
GB2399042A (en) * | 2002-01-16 | 2004-09-08 | Varco Int | Screen assembly and method for screening |
WO2003072344A1 (en) * | 2002-02-26 | 2003-09-04 | Sca Hygiene Products Ab | Method and device for producing a multi-ply web of flexible material, such as paper and nonwoven, and multi-ply material and product produced by the method |
WO2003072345A1 (en) * | 2002-02-26 | 2003-09-04 | Sca Hygiene Products Ab | Method and device for producing a multi-ply web of flexible material, such as paper and nonwoven, and multi-ply material produced by the method |
CN100351073C (zh) * | 2002-02-26 | 2007-11-28 | Sca卫生产品股份公司 | 多层软材料匹、如纸和无纺材料的制造方法和装置及由该方法制造的多层材料 |
GB2407052A (en) * | 2002-07-31 | 2005-04-20 | Varco Int | Method for making a screen for a vibratory separator |
GB2407052B (en) * | 2002-07-31 | 2005-08-10 | Varco Int | Method for making a screen for a vibratory separator |
WO2004011160A1 (en) * | 2002-07-31 | 2004-02-05 | Varco I/P, Inc. | Method for making a screen for a vibratory separator |
WO2004022252A1 (en) * | 2002-09-05 | 2004-03-18 | Varco I/P, Inc. | A method for making a screen assembly for a vibratory separator |
WO2004056560A1 (en) * | 2002-12-19 | 2004-07-08 | Sca Hygiene Products Ab | Method and device for producing a multi-ply printed web of flexible material, such as paper and nonwoven, and multi-ply material produced by the method |
US7153385B2 (en) | 2002-12-19 | 2006-12-26 | Sca Hygiene Products Ab | Method and device for producing a multi-ply printed web of flexible material, such as paper and nonwoven, and multi-ply material produced by the method |
WO2005014187A2 (en) | 2003-07-25 | 2005-02-17 | Varco I/P, Inc. | Apparatus and method for making screen assemblies for vibratory separators |
Also Published As
Publication number | Publication date |
---|---|
NO20022119L (no) | 2002-05-03 |
NO20022119D0 (no) | 2002-05-03 |
CA2382705A1 (en) | 2001-06-07 |
EP1242158A1 (en) | 2002-09-25 |
AU1870701A (en) | 2001-06-12 |
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