WO1999042223A1 - Screen cylinder with high percent open area - Google Patents
Screen cylinder with high percent open area Download PDFInfo
- Publication number
- WO1999042223A1 WO1999042223A1 PCT/US1999/002849 US9902849W WO9942223A1 WO 1999042223 A1 WO1999042223 A1 WO 1999042223A1 US 9902849 W US9902849 W US 9902849W WO 9942223 A1 WO9942223 A1 WO 9942223A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cylinder
- grooves
- slots
- recited
- plate
- Prior art date
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
- B07B1/4618—Manufacturing of 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
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/18—Drum 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
- B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
- B07B1/4681—Meshes of intersecting, non-woven, elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/361—Removing material for deburring or mechanical trimming
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/02—Straining or screening the pulp
- D21D5/16—Cylinders and plates for screens
Definitions
- This invention relates to screens or screen cylinders, and more particularly, to screens which are used in pressure screening apparatus for removing contaminant particles from papermakers' stock.
- High turbulence pressure screening apparatus of the kind shown, for example, in U.S. Pat. No. 4,155,841 issued May 22, 1979 to Chupka and Seifert, is used in the preparation of papermaking stock.
- a suspension of liquid and paper fibers, which may in varying degrees contain undesirable rejects or contaminate particles, is supplied to the inlet of the apparatus as disclosed, for example, in the '841 patent, where it is applied to an annular cylindrically shaped screen having specifically designed slots or perforations therethrough.
- the paper stock is fed to the interior of a vertically oriented cylindrical screen, and the rejects are withdrawn from one end of such a screen, while the accepts pass through the slots or perforations in the screen and are collected at a location outwardly of the screen.
- Rotating foils or vanes are positioned usually on or adjacent the inside of the screen surface, in close relation to the surface, to reduce the plugging of the screen slots or holes.
- the screen cylinder of the kind described above is formed by machining the required slots or grooves in a flat plate of metal material, such as stainless steel, rolling the flat plate into the shape of a cylinder, and welding the rolled plate at the abutting ends to form a welded seam. Thereafter, end rings, formed from bar stock, are rolled, welded at their respective ends, and then attached by welding to the cylinder plate, at its respective ends. Further, one or more intermediate reinforcing rings, also formed from rolled bar stock, are attached by welding at longitudinally spaced locations on the outer surface of the rolled screen plate.
- An example of such a fabricated cylinder screen is shown in U.S. Pat. No. 4,017,387 issued Apr. 12, 1977 to Hatton and Lehman.
- the openings or slots are formed by a laser cutting technique, by focusing a laser cutting beam or by directing such laser beam energy, at the outlet surface toward the inlet surface.
- the cylinder and/or the beam may be moved in relation to the other to make a slot.
- screen cylinders having a plurality of parallel bar-shaped screen elements mounted on crossbars for forming a screen area and defining screen slots therebetween.
- An example of one such screen cylinder is shown in U.S. Pat. No. 5,472,095 issued Dec. 5, 1995 to Malm.
- the screen elements or bars are arranged in parallel adjoining spaced-apart relationship so as to define screen slots therebetween having a predetermined slot inlet width. End rings are welded to the axial ends of the bars. Longitudinally spaced-apart reinforcing rings are welded to the outlet side of the bars.
- the bars are machined or formed, as by drawing or extruding through a die, so as to have a desired cross-section profile. Examples of screening bars having different profiles are shown in U.S. Pat. No. 5,255,790 issued Oct. 26, 1993 to Einoder and -3-
- Such bars or wedgewires typically have a generally wedge-like shape with a wider inlet end and a narrower outlet end.
- Screen cylinders manufactured in accordance with the above are susceptible to variations in screen slot spacing due to inherent movement and misalignment between screen bars.
- the use of a great many shims, as well as machined holding racks or mandrels increases material handling costs and contributes to the variability of screen slot spacing.
- the method includes the steps of machining a first continuous axial groove profile on an inlet side of a metal plate, machining a second continuous axial groove profile on an outlet or accepts side of the metal plate, rolling the plate to a desired diameter, cutting the plate to a desired circumferential length, welding reinforcing rings to the outlet side of the plate, welding end rings to the axial ends of the plate, and cutting substantially continuous slots through the plate, thereby connecting opposite inlet and outlet grooves.
- a plate of material typically stainless steel, having a desired thickness
- Substantially parallel grooves having a first desired profile are machined on an inlet side of the plate by conventional means.
- the grooves may extend substantially the entire length of the plate.
- the plate is turned over and substantially parallel grooves having a second desired profile are machined -4- on an outlet side of the plate.
- the outlet side grooves are machined so as to be in substantial registration with the inlet side grooves on the opposite side of the plate.
- the inlet and outlet profile grooves may be formed by means well known to those with ordinary skill in the art such as, for example, by milling or stamping.
- the grooved plate is rolled or bent to a desired diameter with the inlet surface of the plate directed radially inwardly.
- the grooved plate may be formed about a mandrel if desired. Rings possibly formed from rolled stainless steel bar or other stock are affixed, as by welding, to the axial ends of the rolled plate. Support rings, also made of rolled stainless steel bar stock, are affixed at longitudinally spaced-apart locations, as by welding, to the outlet side of the rolled plate.
- axially extending screen slots are cut through the plate so as to extend through the plate from the outlet side of the rolled plate to the inlet side of the rolled plate.
- the screen slots define fluid flow passages through the rolled plate joining the grooves of the inlet side with the corresponding oppositely disposed grooves of the outlet side of the plate.
- the screen slots extend substantially the entire length of the rolled plate.
- Uncut or interrupted portions may be provided as one proceeds from one axial length end of the slot to the other end. These uncut portions serve as bridges or spacers connecting the solid material extending between the slots to improve overall structural integrity of the screen cylinder and to accurately maintain slot width dimensions.
- the grooves and slots are said to extend substantially along the entire longitudinal dimension of the plate, which dimension corresponds to the axial direction when the plate is ultimately formed as a cylinder.
- the term "substantial" in this connection means that the grooves and slots extend either all the way along the axial direction (i.e., 100% of the axial length) or that the slots and grooves extend almost the entirety of that direction.
- the screen slots are preferably formed by laser cutting, but may be formed by any suitable means such as water jet, electron beam, electro-discharge machining, or other machining or cutting methods. -5-
- pressure screen cylinder design and manufacturing method as described may be used to create baskets for paper pulp screening, such cylinder screens are not limited solely to this use.
- a particular object of the invention is to provide a screen cylinder which is formed with individual screening elements that have the screening advantages of a wedge wire type screen (i.e., large open area) cylinder but one in which the slot dimensions may be more accurately and easily maintained and which has higher mechanical integrity.
- a further object of the invention is to provide a method of making a screen cylinder that results in dimensionally precise screen slots.
- Another object is to provide an improved pulp slurry screen, by fitting it within a cylinder according to the invention.
- Another object is to provide a screen cylinder wherein the slots are cut late in the manufacturing method. Another object is to provide an open area for accepts slurry to pass through the slot, even in those areas which are obstructed by the reinforcing ring. Accepted slurry would simply flow axially along the grooves of the accepts side of the plate, into the accepts chamber.
- Fig. 1 is a perspective view of a screen cylinder made in accordance with the invention
- Fig. 2 is a broken away top plan view of a plate that may be used in forming the screen cylinder of the invention
- Fig. 3 is a broken away plan view of the plate shown in Fig. 2, during an initial step of the manufacturing method by which the screen cylinder is made, showing what will ultimately become the accepts side of the screen cylinder;
- Fig. 4 is a broken away top plan view of the plate shown in Fig. 3, showing what will ultimately become the inlet side of the screen cylinder;
- Fig. 5 is an enlarged transverse cross sectional view of the plate shown in Fig. 4;
- Fig. 6 is an enlarged transverse cross sectional view of a portion of the screen cylinder shown in Fig. 1, during one of the final assembly steps;
- Fig. 7 is a simplified perspective view of the screen cylinder during the assembly stage shown in Fig. 6, with only certain of the axial extending screen bars and the transversely oriented support rings shown for increased clarity;
- Fig. 8 is a simplified cross-sectional view taken along the plane shown by lines and arrows 8-8 of Fig. 6; and Fig. 9 is an enlarged elevational view in partial cross section showing the inlet side of another embodiment of the screen cylinder.
- FIG. 1 there is shown screen cylinder 10, made in accordance with the invention.
- the cylinder includes top and bottom end rings 20, 22 respectively which serve as axial end reinforcement for a multiplicity of spaced axial extending screen bars 25. Between adjacent bars 25, openings 27 are provided and serve to permit ingress and egress of fluid therebetween while performing a screening or filtering function.
- Reinforcing rings 14, 16, and 18 are provided at axially spaced locations along the periphery of the bars 25 to lend support and stability to the screen cylinder.
- the screen cylinder is of the type wherein the pulp suspension is to be admitted into the interior of the cylinder, as shown by the arrow 29, with accepts flowing through the opening between the bars as shown by arrows 31. Rejects, or matter that does not pass through the openings exits the cylinder at an egress point (not shown) in communication with the interior cylinder space.
- a plate 40 which is composed of a rigid, durable material such as metal including stainless steel, aluminum, titanium and alloy forms thereof. At present, it is desired to use a stainless steel plate having a thickness of about % - 3 ", most preferably about %".
- the length (i.e., axial direction with respect to the formed cylinder) and width of the plate are chosen so that a screen cylinder having the requisite circumference and axial length may be formed from the plate.
- the plate has a top surface 42 that ultimately will be formed and used as the inlet surface of the screen cylinder, with the outlet surface of the screen cylinder corresponding to the bottom or underside 44 of the plate 40.
- the plate is used to form the series of axially extending screen bars 25 and intervening openings 27 in the following manner.
- a multiplicity of lengthwise (or axially extending) grooves 46 are formed in the top surface 42 of the plate. These grooves may be provided in any of a myriad of possible configurations; all designed to form the desired contour for the inlet surface of the screen cylinder.
- grooves 46 are generally designated as reference number 46.
- Grooves 46 comprise, more specifically an inclined surface 48, a relatively flat portion 50 and a downwardly sloped surface 52. Connecting or bridging adjacent pairs of the grooves is a land portion 54 which will subsequently be treated as stated hereinafter.
- the grooves 46 may be formed in the plate surface by conventional techniques such as by milling, plasma, wet, or other etching methods, laser cutting, stamping, extruding or casting.
- the grooves 46 are cut or formed only partially through the thickness of the plate from the top side 42 toward the bottom 44.
- the bottom surface 44 is also provided with a plurality of grooves 60 that extend along the lengthwise (axial) direction and, upon completion of other manufacturing steps, will communicate with the grooves 46 provided on the top side of the plate.
- Grooves 60 may be provided in the bottom surface by the same convectional means as those mentioned above in connection with the formation of the grooves in the top 42 of the plate.
- the grooves 60 do not extend through the entire thickness of the plate, and are separated from each other by solid sections 61. Land sections 54 block communication between the grooves 60 and 46.
- the grooves 46, 60 taken together, will define the intended surface contours for the inlet and outlet surfaces of the screen cylinder.
- the plate is then rolled into the desired cylindrical shape, corresponding to the desired shape of the finished cylindrical screen.
- the width wise borders of the plate may be affixed together to thereby define the cylinder such as by brazing or welding. Possibly, the widthwise ends could be affixed to an axially extending stabilizer bar or the like.
- the thus contoured plate can, if desired, be placed in inventory for further use upon customer demand or it can be treated such as by surface treatment to improve hardness or other properties of the metal.
- the thus formed cylinder can be hardened such as by precipitation, flame, induction or other conventional hardening treatments.
- outer, reinforcing rings such as those shown in Fig. 1, and top and bottom support rings 20, 22 may be fixedly secured to the assembly to lend structural support to the cylinder such as by brazing or welding.
- This can be best understood in conjunction with Fig. 5 wherein slots 62 are shown in phantom.
- the slots 62 are -9- provided in the lands portions 54 of the inlet surface.
- a laser is used to cut the slots 62.
- Both CO 2 and pulsed YAG lasers may be mentioned as exemplary laser cutting tools to be used to cut the slots 62.
- other methods such as E- beam, electro-discharge machining (EDM), water jet, acid etching, or other etching methods etc. may be used.
- EDM electro-discharge machining
- the important criterion is that communication between the inlet face and outlet surface contours is effected by the slots 62.
- a plurality of the thus formed screen bars 25 are shown wherein the grooves 46 on the inlet side of the cylinder communicate with the accepts side grooves 60 via the slots 62.
- the accepts side faces of the screen bars are fixedly secured to reinforcing ring 16 at the solid sections 61.
- the inlet contour comprises inclined surface 48, flat 50, and downwardly (sloped toward the accepts side) sloped surface 52.
- the accepts side includes large cut out portions defined by grooves 60.
- short bridges 80 can be provided along the axial length of certain ones of the slots 62.
- Fig. 7 there is shown a simplified version of a completed basket assembly, with only one support ring shown, and only a plurality of the screen bars shown so as to facilitate understanding.
- the screen cylinder has a plurality of axial extending screen bars 25 with the inner face or inlet surface contour 42 communicating with the outer face or accepts contour 44 through the slots 62.
- An alternative embodiment is shown in Fig. 9 wherein the inlet surface 42 of the screen bars is shown.
- the slots 62 have been formed so as to provide a varying width-wise dimension.
- slots 62 have a first width-wise dimension 63 at the axial top of the surface, with a second, wider dimension 65 provided at the bottom. Varying the width of the slots as shown may be beneficial in those cases wherein, for example, the increased concentration of dirt particles and the like in the pulp suspension will occur toward the top portion of the screen cylinder. -10-
- Narrowing of the slots at this level or cylinder height will decrease the dirt which might pass into the accepts flow.
- one advantage of the methods and resulting structure shown herein is that the slots can be provided along substantially the entire length of the precursor metal plate.
- the plate material preferred for use is a hard stainless steel, such as Armco's "Nitronic 33" stainless steel.
- This is a low-nickel austenitic stainless steel having high resistance to wear and galling, with a Rockwell B hardness of around 95.
- "Inconel” and precipitation hardened stainless steels may also be mentioned as exemplary.
- An advantage of this invention is that very hard, otherwise difficult-to machine materials may be used as the plate.
- the method of this invention has the advantage of permitting the formation of slots over a substantially wide range of slot widths, such as 0.002" or less up to 0.035" or more.
- the width of the laser cut slots was about 0.010".
- the plate thickness was 0.31" and the accepts side grooves 60 (such as those shown in Fig. 5) were on the order of about 0.025".
- the slots 62 are spaced at a density of about six to a linear inch.
- a cylinder type screen can be formed which has screening elements that resemble wedge wires and therefore the screen itself closely approximates a wedge wire type screen but without certain of the disadvantages of such a screen including the difficulty of maintaining the wedge wires in a precisely aligned condition during manufacture and thereafter.
- the advantages of this screen product include the provision of continuous axial slots, precision slot width, and precision machine profiles on the inlet and outlet sides as well as high mechanical strength to permit operation at low speeds such as ten meters per second up to higher speeds such as 25 meters per second or more, depending upon consistency requirements.
- the slots 62 can be formed in the flat plates (such as those shown in Figs. 3 and 4).
- slot formation after imparting the cylindrical shape to the plate is preferred since the integrity of the plate will be better preserved if it is not slotted prior to rolling.
- slot cutting after reinforcement of the cylinder via the rings 14, 16 and 18 and even the top and bottom supports 20, 22 greatly enhances the overall structural stability of the assembly and hence the dimensional accuracy of the slots.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Manufacturing & Machinery (AREA)
- Paper (AREA)
- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000532222A JP2002503774A (en) | 1998-02-23 | 1999-02-10 | Screen cylinder with high ratio open area |
CA002322044A CA2322044A1 (en) | 1998-02-23 | 1999-02-10 | Screen cylinder with high percent open area |
EP99906867A EP1087845A1 (en) | 1998-02-23 | 1999-02-10 | Screen cylinder with high percent open area |
BR9908194-6A BR9908194A (en) | 1998-02-23 | 1999-02-10 | Processes for forming a screen plate, for forming a cylindrical screen, for forming a screen cylinder for sieving papermaking raw material, and, screen cylinder for sieving papermaking raw material. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US7549798P | 1998-02-23 | 1998-02-23 | |
US60/075,497 | 1998-02-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999042223A1 true WO1999042223A1 (en) | 1999-08-26 |
Family
ID=22126156
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1999/002849 WO1999042223A1 (en) | 1998-02-23 | 1999-02-10 | Screen cylinder with high percent open area |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1087845A1 (en) |
JP (1) | JP2002503774A (en) |
BR (1) | BR9908194A (en) |
CA (1) | CA2322044A1 (en) |
WO (1) | WO1999042223A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105492131A (en) * | 2013-08-29 | 2016-04-13 | 波米尔公司 | Drum, a machine comprising such drum, and a method for drum and manufacturing of such drum |
CN113843532A (en) * | 2021-10-28 | 2021-12-28 | 武昌工学院 | Screening drum manufacturing process system based on robot laser cutting and working method |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITVI20040139A1 (en) * | 2004-06-10 | 2004-09-10 | Comer Spa | METHOD FOR THE MANUFACTURE OF FILTER BASKETS IN FIBER SUSPENSION AND FILTER BASKET MANUFACTURED USING THE METHOD |
CN107378247A (en) * | 2017-09-27 | 2017-11-24 | 杨沁玥 | A kind of filter screen laser stitch welding technique |
CN107498179A (en) * | 2017-09-27 | 2017-12-22 | 杨沁玥 | A kind of filter screen welding procedure |
RU2732749C1 (en) * | 2020-03-11 | 2020-09-22 | Евгений Иванович ВЕРХОЛОМОВ | Slot-type filter |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0316570A2 (en) * | 1987-11-14 | 1989-05-24 | J.M. Voith GmbH | Screen drum and method of manufacturing same |
DE4234440A1 (en) * | 1992-10-13 | 1994-04-14 | Peter Prof Dr Ing Dietz | Light weight construction centrifugal sieve drum - has two base elements having rotational symmetry, etc., used for removal of oversize particles |
US5472095A (en) * | 1993-05-14 | 1995-12-05 | Ab Knufsilplatar | Screening cylinder |
US5513757A (en) * | 1994-06-02 | 1996-05-07 | Sulzer Papertec Mansfield Inc. | Continuous cut slotted screen basket |
US5791495A (en) * | 1996-03-11 | 1998-08-11 | Beloit Technologies, Inc. | Paper pulp screen cylinder |
-
1999
- 1999-02-10 JP JP2000532222A patent/JP2002503774A/en active Pending
- 1999-02-10 EP EP99906867A patent/EP1087845A1/en not_active Withdrawn
- 1999-02-10 WO PCT/US1999/002849 patent/WO1999042223A1/en not_active Application Discontinuation
- 1999-02-10 BR BR9908194-6A patent/BR9908194A/en unknown
- 1999-02-10 CA CA002322044A patent/CA2322044A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0316570A2 (en) * | 1987-11-14 | 1989-05-24 | J.M. Voith GmbH | Screen drum and method of manufacturing same |
DE4234440A1 (en) * | 1992-10-13 | 1994-04-14 | Peter Prof Dr Ing Dietz | Light weight construction centrifugal sieve drum - has two base elements having rotational symmetry, etc., used for removal of oversize particles |
US5472095A (en) * | 1993-05-14 | 1995-12-05 | Ab Knufsilplatar | Screening cylinder |
US5513757A (en) * | 1994-06-02 | 1996-05-07 | Sulzer Papertec Mansfield Inc. | Continuous cut slotted screen basket |
US5791495A (en) * | 1996-03-11 | 1998-08-11 | Beloit Technologies, Inc. | Paper pulp screen cylinder |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105492131A (en) * | 2013-08-29 | 2016-04-13 | 波米尔公司 | Drum, a machine comprising such drum, and a method for drum and manufacturing of such drum |
EP3038765A1 (en) * | 2013-08-29 | 2016-07-06 | Bomill Ab | Drum, a machine comprising such drum, and a method for drum and manufacturing of such drum |
EP3038765A4 (en) * | 2013-08-29 | 2017-05-03 | Bomill Ab | Drum, a machine comprising such drum, and a method for drum and manufacturing of such drum |
AU2014311875B2 (en) * | 2013-08-29 | 2018-08-02 | Bomill Ab | Drum, a machine comprising such drum, and a method for drum and manufacturing of such drum |
US10315225B2 (en) | 2013-08-29 | 2019-06-11 | Bomill Ab | Drum, a machine comprising such drum, and a method for drum and manufacturing of such drum |
CN105492131B (en) * | 2013-08-29 | 2019-11-15 | 波米尔公司 | Drum, the machine including drum, the method for drum and drum manufacturing method |
CN113843532A (en) * | 2021-10-28 | 2021-12-28 | 武昌工学院 | Screening drum manufacturing process system based on robot laser cutting and working method |
CN113843532B (en) * | 2021-10-28 | 2023-08-15 | 武昌工学院 | Screening cylinder manufacturing process system based on robot laser cutting and working method |
Also Published As
Publication number | Publication date |
---|---|
EP1087845A1 (en) | 2001-04-04 |
CA2322044A1 (en) | 1999-08-26 |
JP2002503774A (en) | 2002-02-05 |
BR9908194A (en) | 2000-10-24 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5064537A (en) | Seamless screen cylinder with laser cut openings | |
US5200072A (en) | Screen plates and methods of manufacture | |
US4795560A (en) | Screen plates | |
US4885090A (en) | Screen plates | |
CA2248639A1 (en) | Paper pulp screen cylinder | |
US5513757A (en) | Continuous cut slotted screen basket | |
WO2002083263A1 (en) | Screen cylinder and method | |
US7188733B2 (en) | Screening device, such as a screen cylinder, and method of manufacture of the screening device | |
WO1999042223A1 (en) | Screen cylinder with high percent open area | |
US4901417A (en) | Method of finishing screen plates | |
US6105788A (en) | Composite screen | |
CA2111147A1 (en) | Method of manufacturing a screen cylinder and a screen cylinder produced by the method | |
CA1336279C (en) | Screen and method of manufacture | |
JPH11501252A (en) | Screen basket support structure and method of manufacturing the same | |
MXPA00008271A (en) | Screen cylinder with high percent open area | |
WO1999050019A1 (en) | Wedgewire pressure screen and method for making same | |
KR20010023125A (en) | Manufacture of screen plate with screen slots obtained by laser beam cutting | |
WO2001051168A1 (en) | Wedge wire screen cylinder and method of manufacturing the same | |
JPH08112508A (en) | Production of screen basket and screw press cylinder, screen basket and screw press cylinder |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): BR CA JP MX US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE |
|
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
ENP | Entry into the national phase |
Ref document number: 2322044 Country of ref document: CA Kind code of ref document: A Ref document number: 2322044 |
|
ENP | Entry into the national phase |
Ref document number: 2000 532222 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: PA/a/2000/008271 Country of ref document: MX Ref document number: 09622818 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1999906867 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 1999906867 Country of ref document: EP |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: 1999906867 Country of ref document: EP |