US20100059487A1 - Method for the production of a screen, particularly a rigid screen, for the treatment of fibrous material suspensions suitable for the production of paper - Google Patents

Method for the production of a screen, particularly a rigid screen, for the treatment of fibrous material suspensions suitable for the production of paper Download PDF

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Publication number
US20100059487A1
US20100059487A1 US12/608,133 US60813309A US2010059487A1 US 20100059487 A1 US20100059487 A1 US 20100059487A1 US 60813309 A US60813309 A US 60813309A US 2010059487 A1 US2010059487 A1 US 2010059487A1
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US
United States
Prior art keywords
screen
openings
screen layers
millimeters
layers
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.)
Abandoned
Application number
US12/608,133
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English (en)
Inventor
Werner Brettschneider
Wolfgang Gindele
Roland REINHOLD
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.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
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 Voith Patent GmbH filed Critical Voith Patent GmbH
Assigned to VOITH PATENT GMBH reassignment VOITH PATENT GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BRETTSCHNEIDER, WERNER, GINDELE, WOLFGANG, REINHOLD, ROLAND
Publication of US20100059487A1 publication Critical patent/US20100059487A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • 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
    • B07B1/46—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
    • 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
    • B07B1/469—Perforated sheet-like material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/18—Filters characterised by the openings or pores
    • B01D2201/184—Special form, dimension of the openings, pores of the filtering elements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining

Definitions

  • the present invention relates to a method for the production of a screen for the treatment of fibrous suspensions suitable for the production of paper.
  • Screens which are produced in a method of the type of the present invention are preferably used for the wet screening of fibrous suspensions in order to remove contraries present therein. They are generally rigid and, as a result, differ from flexible endless screens which are used in screen presses and papermaking machines. The characteristics of such a screen result substantially from the size, shape and number of openings found therein. As a rule, these are kept smaller than the substances to be screened out.
  • Such screens are advantageously used, for example, in pulpers, secondary pulpers and sorters for the preparation of paper fibrous suspensions, having the task of holding back contraries.
  • such screens are intended to have a screening characteristic which can be achieved, for example, by means of round openings between 1 and 30 mm, depending on the coarseness of the stocks.
  • the aim is also to reach the highest possible throughput through screens of this type, which is to say the largest possible quantity of non-rejected stocks are intended to pass through the openings. This may be promoted by there being as many openings as possible. Expressed overall, trouble is taken to have the largest possible free screen area, based on the total surface of the screen element.
  • What is needed in the art is a method for the production of screen elements which, measured by the utility value of the screen element, is relatively inexpensive and ensures an optimum screening characteristic, in particular when screening fibrous suspensions.
  • the present invention provides an efficient method for the production of a screen, particularly a rigid screen, (suitable for the production of paper) for the treatment of fibrous material suspensions.
  • Screens which are intended to be used for the treatment of fibrous suspensions must have an adequate wall thickness for strength reasons.
  • the method according to the present invention offers a fundamental economic advantage in production. As a rule, it requires less effort to introduce holes or other screen openings into thinner metal layers than into thick ones. In particular, in the range of sizes typical here for the screen openings, which, for example, lies between 1 and 20 millimeters, methods such as punching or laser cutting can be employed. This generally gives rise to lower costs than those which arise in the case of drilling.
  • openings in the screen layers are milling, water jet cutting, etching, erosion, electrochemical boring, extrusion hole forming or broaching.
  • screen openings of which the cross sections are not rotationally symmetrical can easily be produced, for example slots, rectangles, diamonds, hexagons or other polygons having round corners. This can offer particular advantages in the wet screening of the fibrous suspensions.
  • the specific configuration of the screen openings can be carried out very well given the choice of a relatively large number of screen layers, that is to say considerably more than 3, for example, 6 to 8 screen layers.
  • the individual screen layers consist of thin metal sheets (e.g. 2 mm), which are provided with openings by punching, laser cutting or other methods.
  • the screen layers are produced, for example, from metal, plastic, rigid foam or natural structural materials.
  • a combination of different materials is advantageous, for example, abrasion-resistant material in the screen layer on the feed side (top layer) and, for example, ductile material in the central layers and/or the bottom layer.
  • the screen produced in accordance with the method of the present invention may also be provided with blind holes, which of course can be achieved without great effort by the new production method by there being no opening at specific points of the appropriate screen layer.
  • the screen produced by the method of the present invention is generally subjected to high forces
  • the individual screen layers can be joined by a method in which correspondingly high forces can be absorbed.
  • Such methods are, for example, brazing methods, which is to say soft brazing, brazing or high-temperature brazing, since these produce a high-strength flat joint and are thermally relatively unproblematic.
  • brazing methods which is to say soft brazing, brazing or high-temperature brazing
  • a further possibility consists in technical adhesive bonding methods.
  • the joint between the screen layers is detachable in order to have the possibility of replacing worn parts simply.
  • Detachable joints are formed, for example, by screwing, riveting, clamping or a form fit, to mention only these. Given more than three screen layers, these can be partly detachably and partly non-detachably joined to one another, which offers the possibility of providing only the layer on the feed side (top layer) which is particularly subjected to wear to be replaced.
  • the screen layer on the feed side (top layer) which is critical for the screen characteristic can be kept relatively thin, a screen of high strength nevertheless being produced by means of an appropriately ruggedly designed further layer or further layers.
  • the possibility of using a thin top layer also has the advantage of a lower pressure loss during operation since, in the finished screen, only short flow paths are produced within the openings of the top layer determining the screen character. The length of this flow path corresponds to the thickness of the top layer. Even if a conical widening of the screen openings in the intended flow direction is required, production is nevertheless simpler than in the case of single-part screens.
  • the method of the present invention is used to produce flat screens.
  • a screen can have the shape of a circular ring, which is possibly assembled from circular ring segments.
  • a screen is produced as a cylindrical screen basket, in which the screen layer on the feed side is radially on the inside and further layers are on the outside, the layer on the feed side can be provided with the openings when in the flat state. If it is then bent, the openings, viewed radially, widen from the inside to the outside as a result of the bending.
  • conical openings are produced in the screening layer, in that the flow cross sections widen.
  • FIG. 1 shows a part of a screen produced by the method according to the present invention, illustrated sectioned
  • FIGS. 2-6 shows various variants using the example of different screens, illustrated sectioned
  • FIG. 7-8 each show a screen part produced by the method according to the present invention in a view on the outflow side;
  • FIG. 9 shows a screen produced by the method according to the present invention having rings of different material.
  • screen 1 produced by the method of the present invention.
  • This includes three screen layers 2 , 3 and 4 joined flat to one another and screen openings 7 and 8 which, in this example, pass through all screen layers.
  • the screen layers are joined flat to one another at contact areas 17 , for example, by high-temperature brazing.
  • screen layer 2 located at the top forms the feed side, which is to say the liquid to be screened flows through openings 7 and 8 from top to bottom.
  • the downstream opening is larger than the respective upstream opening.
  • screen openings 8 drawn on the right are substantially cylindrical
  • screen openings 7 drawn on the left are composed of a combination of two cylinders and in a conical opening (screen layer 3 ) lying between. Even though openings 7 and 8 are drawn in the same screen here, this should rather be seen as an exception. Normally, the screen openings are the same as one another. The same is also true of the other figures.
  • the smallest openings are located on the feed side of screen 1 (which here means in topmost screen layer 2 ), as compared with those in screen layers following downstream.
  • these smallest openings determine the separation characteristic, that is to say which parts pass through the screen or are rejected before it.
  • the method of the present invention it is easily possible not only to adjust the size but also the shape of the smallest opening to the requirements.
  • Such shapes can be, for example, circles, ovals, slots, rectangles or polygons, to name only these.
  • screen pattern By means of an appropriately beneficially selected shape and arrangement (“screen pattern”), it is possible to produce a large free area, based on the total screen area.
  • the four-layer screen shown in FIG. 2 having screen openings 9 , has, for example, in each case has oblique openings in central layers 3 and 4 and cylindrical openings in screen layer 5 drawn at the bottom, which have a lateral offset with respect to the upstream openings.
  • Such a form of the screen openings can be implemented relatively easily with the aid of the method of the present invention and has the advantage that, given oblique inflow of the liquid to be screened, a better flow is possible.
  • the oblique inflow is based on the fact that, with the aid of screen cleaner 14 (cleaning rotor) moved past the screen (in the direction of the arrow), an oblique velocity direction is achieved, which is therefore not perpendicular to the plane of the screen.
  • the flow can impinge obliquely because of the shape of the casing.
  • FIG. 3 a screen having a total of five layers ( 2 , 3 , 4 , 5 , 6 ) is illustrated, its openings 10 being designed to be slightly conical in many cases.
  • the conicity can come from the punching operation, which is to say the introduction of the openings into the screen layers, which, as is known, leads to the side walls not being parallel, but being at an acute angle to one another. This conicity is shown exaggerated in FIG. 3 .
  • the method according to the present invention also makes it very simple to provide a screen with non-continuous depressions 11 , as shown in FIG. 4 .
  • Such depression 11 is produced by the relevant opening not running through all the screen layers but, for example, only through screen layer 2 on the feed side. It can be round or groove-like, for example.
  • FIG. 4 shows a strip-like protrusion, which is formed by the inclusion of profiled rod 12 . The latter is inserted into a suitable recess which runs through one or more screen layers (here, for example, screen layers 2 and 3 ), for example, brazed in. Depressions or protrusions on the feed side of the screen are suitable to influence the flow of the liquid to be screened in such a way that the tendency to blocking of the adjacent screen openings diminishes.
  • inserts 13 which, in their center, have continuous screen openings 15 and are inserted into a plurality or all of screen layers 2 , 3 , 4 .
  • Such inserts 13 can be designed to be particularly wear-resistant and are possibly replaceable (see FIG. 5 ).
  • inserts 13 having suitable screen openings 15 are illustrated in FIG. 6 .
  • inserts 13 may protrude by a certain amount m on the feed side and/or on the outlet side, in order as a result, for example, to improve the flow in this area.
  • This amount m is expediently between 0.5 and 5 mm.
  • Insert 13 ′ shown in the center of FIG. 6 does not extend through all the screen layers, but only through upper screen layers 2 and 3 . In this way, the parts of the screen that are at risk of wear, which is to say inserts 13 ′, can be kept smaller.
  • the wear is particularly high in the area where screen cleaner 14 is used.
  • the form illustrated in FIG. 6 showing insert 13 ′, extending over two screen layers, can be replaced particularly easily if care is taken that two screen layers 2 and 3 can be separated without being destroyed. This also applies to inserts without any projection.
  • FIG. 7 A view of the outflow side of a screen produced in accordance with the method of the present invention is shown by FIG. 7 .
  • This is a partial view which, overall, includes three screen layers 2 , 3 , 4 , between which contact areas 17 are located.
  • Screen openings 8 illustrated on the left in each case have a cylindrical cross section, the diameter of which is different in the various screen layers. In this case, the openings in the individual screen layers are offset with respect to one another, so that the result is an oblique flow direction.
  • Screen opening 16 also has a similar offset, its flow cross section having the shape of a slot.
  • Critical for the screening characteristic of the screen produced in accordance with the method of the present invention are the smallest openings, which are normally present on the feed side, which is to say in screen layer 2 in examples illustrated in the figures.
  • the further screen layers which is to say for example 3 and 4 in FIGS. 1 and 4 to 6 , substantially have the task of providing the screen produced in this way with the necessary strength, which has already been discussed. It is, therefore, readily possible, as illustrated in FIG. 8 , to make openings in lower screen layer 4 which are so large that a plurality of openings from another screen layer open into these. In this case, it is generally expedient if such a larger opening covers about 3 to 15 smaller openings. This measure can also be taken in other screen layers, with the exception of upper screen layer 2 .
  • a further advantage of the production method according to the present invention resides in the possibility that at least one screen layer, in particular screen layer 2 on the feed side, is divided up into a plurality of preferably concentric circular rings 18 , 19 , and that circular rings 18 , 19 are produced from different material ( FIG. 9 ).
  • Radially outer screen ring 19 can then be composed of a particularly high-quality wear-resistant material, for example, while screen ring 18 located radially further in can be designed correspondingly more inexpensively, with the advantage that the wear behavior of overall screen 1 does not become poorer, despite reduced production costs.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Paper (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Filtering Materials (AREA)
US12/608,133 2007-04-30 2009-10-29 Method for the production of a screen, particularly a rigid screen, for the treatment of fibrous material suspensions suitable for the production of paper Abandoned US20100059487A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102007020325A DE102007020325B3 (de) 2007-04-30 2007-04-30 Verfahren zur Herstellung eines Siebes für die Behandlung von zur Papiererzeugung geeigneten Faserstoffsuspensionen
DE102007020325.1 2007-04-30
PCT/EP2008/050128 WO2008131974A1 (de) 2007-04-30 2008-01-08 Verfahren zur herstellung eines siebes, insbesondere eines starren siebes für die behandlung von zur papiererzeugung geeigneten faserstoffsuspensionen

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/050128 Continuation WO2008131974A1 (de) 2007-04-30 2008-01-08 Verfahren zur herstellung eines siebes, insbesondere eines starren siebes für die behandlung von zur papiererzeugung geeigneten faserstoffsuspensionen

Publications (1)

Publication Number Publication Date
US20100059487A1 true US20100059487A1 (en) 2010-03-11

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Family Applications (3)

Application Number Title Priority Date Filing Date
US12/608,133 Abandoned US20100059487A1 (en) 2007-04-30 2009-10-29 Method for the production of a screen, particularly a rigid screen, for the treatment of fibrous material suspensions suitable for the production of paper
US12/608,141 Expired - Fee Related US8123912B2 (en) 2007-04-30 2009-10-29 Screen
US13/272,962 Expired - Fee Related US8216428B2 (en) 2007-04-30 2011-10-13 Screen

Family Applications After (2)

Application Number Title Priority Date Filing Date
US12/608,141 Expired - Fee Related US8123912B2 (en) 2007-04-30 2009-10-29 Screen
US13/272,962 Expired - Fee Related US8216428B2 (en) 2007-04-30 2011-10-13 Screen

Country Status (8)

Country Link
US (3) US20100059487A1 (enrdf_load_stackoverflow)
EP (2) EP2290160A1 (enrdf_load_stackoverflow)
JP (2) JP2010525185A (enrdf_load_stackoverflow)
KR (1) KR20100016106A (enrdf_load_stackoverflow)
CN (1) CN101675192A (enrdf_load_stackoverflow)
BR (1) BRPI0811018A2 (enrdf_load_stackoverflow)
DE (1) DE102007020325B3 (enrdf_load_stackoverflow)
WO (1) WO2008131974A1 (enrdf_load_stackoverflow)

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US11712642B2 (en) * 2013-07-25 2023-08-01 Schlumberger Technology Corporation Apparatus, system and/or method for modular filter screens

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FI20115222A7 (fi) * 2011-03-04 2012-09-05 Metso Fabrics Oy Paperikonekudos
DE102011081951A1 (de) * 2011-09-01 2013-03-07 Voith Patent Gmbh Sieb I
DE102014209200B3 (de) * 2014-05-15 2015-04-09 Voith Patent Gmbh Verfahren zur Herstellung einer Siebvorrichtung
JP6460741B2 (ja) * 2014-08-06 2019-01-30 相川鉄工株式会社 製紙用ストレーナ及び製紙用異物分離装置
CN106049158A (zh) * 2016-05-30 2016-10-26 许昌中亚工业智能装备股份有限公司 一种新型造纸机用过滤网
US10835925B2 (en) 2017-03-23 2020-11-17 Verily Life Sciences Llc Sieving devices for pupae separation
US10772309B2 (en) 2017-03-23 2020-09-15 Verily Life Sciences Llc Sieving apparatuses for pupae separation
US9987664B1 (en) * 2017-05-10 2018-06-05 Garabedian Bros., Inc. Item size grader
CN107442400A (zh) * 2017-08-30 2017-12-08 郑州大学 一种玉米籽粒除杂装置
DE102018004504A1 (de) * 2018-06-07 2019-12-12 Hein, Lehmann Gmbh Lochplatte
PE20240978A1 (es) * 2020-12-18 2024-05-07 Polydeck Screen Corp Panel de tamizaje con aberturas revestido de ceramica
US11648588B2 (en) 2020-12-18 2023-05-16 Polydeck Screen Corporation Ceramic lined aperture screening panel
CN112792745A (zh) * 2020-12-29 2021-05-14 中核建中核燃料元件有限公司 一种防屑板水刀切割制造方法

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Publication number Priority date Publication date Assignee Title
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Also Published As

Publication number Publication date
CN101675192A (zh) 2010-03-17
JP2010525185A (ja) 2010-07-22
KR20100016106A (ko) 2010-02-12
EP2152961A1 (de) 2010-02-17
WO2008131974A1 (de) 2008-11-06
BRPI0811018A2 (pt) 2015-01-27
US8216428B2 (en) 2012-07-10
DE102007020325B3 (de) 2009-01-15
JP2010525186A (ja) 2010-07-22
EP2290160A1 (de) 2011-03-02
US8123912B2 (en) 2012-02-28
US20120024763A1 (en) 2012-02-02
US20100059194A1 (en) 2010-03-11

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