EP3450625A1 - Abstreifleiste zur verwendung in einer anlage zur herstellung eines papierbandes - Google Patents

Abstreifleiste zur verwendung in einer anlage zur herstellung eines papierbandes Download PDF

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Publication number
EP3450625A1
EP3450625A1 EP18188284.6A EP18188284A EP3450625A1 EP 3450625 A1 EP3450625 A1 EP 3450625A1 EP 18188284 A EP18188284 A EP 18188284A EP 3450625 A1 EP3450625 A1 EP 3450625A1
Authority
EP
European Patent Office
Prior art keywords
squeegee
profiling
strips
strip
section
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.)
Withdrawn
Application number
EP18188284.6A
Other languages
German (de)
English (en)
French (fr)
Inventor
Klaus Bartelmuss
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP3450625A1 publication Critical patent/EP3450625A1/de
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/0027—Screen-cloths
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/48—Suction apparatus
    • D21F1/52—Suction boxes without rolls
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/18—Shaking apparatus for wire-cloths and associated parts
    • D21F1/20—Shaking apparatus for wire-cloths and associated parts in Fourdrinier machines
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/48—Suction apparatus
    • D21F1/483—Drainage foils and bars
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/48—Suction apparatus
    • D21F1/52—Suction boxes without rolls
    • D21F1/523—Covers thereof
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper

Definitions

  • the subject invention relates to a squeegee for use in a plant for producing a paper tape with a wire, which is movable over a plurality of transverse to the direction of movement scraper strips.
  • the subject invention further relates to a kit and a system for producing a paper tape.
  • Known plants for producing a paper tape have a self-contained screen belt, which is moved by means of conveyor rollers in circulation and on which at the beginning of the plant, a pulp is sprayed.
  • the screen belt In a first area of the system, the screen belt is moved over squeegee strips and suction boxes formed with squeegee strips, through which liquid which has leaked out of the fiber pulp is stripped off and sucked off.
  • the paper belt produced on the wire belt is dried by means of felt belts.
  • the squeegee located in such a system which are aligned transversely to the direction of movement of the wire, are made of metal or plastic strips, which provided at its in the operating position the wire belt upper side with a support of a wear-resistant material, in particular ground ceramic plates could be.
  • the ceramic plates consist in particular of Al oxide, of Zr oxide, of Si nitride and of Si carbide.
  • the screen belt is moved over the wiper strips at a speed of 1 m / sec to 40 m / sec.
  • the squeegee serve to strip the liquid escaped from the pulp and located on the underside of the screen belt liquid from the screen belt.
  • the screen belt During the movement of the screen belt over the scraper strips, the screen belt abuts against the surfaces of the scraper strips or on the ceramic plates located thereon, which results in high frictional resistances which must be overcome by the conveyor rollers.
  • the surfaces of the squeegee and the screen belt are subject to heavy wear, which is why the squeegee and the screen belt have low lifetimes.
  • the subject invention has for its object to provide a squeegee, through which the friction occurring between the screen belt and the individual squeegees are reduced during operation of such a belt conveyor system.
  • This object is achieved in that the surface of the wiper strip with a defined profile, which has elevations and / or depressions, is formed, wherein the height extent of the profiling is at least 0.1 mm.
  • the elevations or depressions may be randomly or not specifically defined and / or distributed. Preferred is in the invention However, if the elevations or the wells have a defined profiling and / or are defined distributed on the surface, because thus a more targeted influencing of the friction is possible.
  • the squeegee is formed on its in the operating position the screen belt associated surface with a plurality of juxtaposed ceramic plates which are formed on their surface with a defined profiling in the form of elevations and / or depressions, wherein the height extent the profiling is at least 0.1 mm.
  • the height extent is up to 3 mm, preferably up to 2.5 mm or up to 1.6 mm, in particular 0.2 mm up to 0.8 mm.
  • the surface of the wiper strip can be formed with a profile aligned in the longitudinal extent of the wiper strip or with a profiled angle enclosing this.
  • the profiling preferably has the shape of triangular in cross-section ribs, rectangular strips or wave-like strips, but in the context of the invention, other profiles are possible.
  • the profiles of juxtaposed ceramic plates can be offset and / or different from each other both in and across the longitudinal direction of the wiper strip.
  • the longitudinal extent of the elevations and / or the depressions with the longitudinal direction of the wiper strip at an angle of 0 ° to 80 °.
  • the profiling can be formed by recesses located at a distance from one another, in particular by recesses or cylindrical bores concave in cross section.
  • the surface of the squeegee strips may have a convex curvature in cross-section transverse to the longitudinal extent of the squeegee strip, wherein in the case of Invention is preferred if the curvature has a radius of 100 mm to 500 mm, preferably from 200 mm to 350 mm.
  • the side edges of the surface of the wiper strip are rounded in cross-section with a radius of 0.5 mm to 5 mm, preferably 1 mm to 3 mm.
  • the surfaces facing the screen belt in the operating position which are coated in particular with ceramic plates, are ground flat, having surface roughness values Ra of 0.15 ⁇ m to 0.7 ⁇ m. Due to the surface grinding of the surfaces of the ceramic plates or the resulting low roughness values, according to the known state of the art, the frictional resistances occurring between the surfaces of the wiping strips, in particular the surfaces of the ceramic plates, and the moving sieve belt are minimized.
  • the present invention is based on the finding that in a significantly enhanced profiling of the surfaces with defined elevations or depressions through the moving across the squeegee strainer in the liquid, which is located in the wells, bow waves occur through which the screen belt in the areas of the surveys on this is raised, wherein there is a layer of liquid between the screen belt and the surveys, which are significantly reduced by the friction occurring between the screen belt and the surveys.
  • FIG.1 a portion of a screen belt 1 is shown in a plant for producing a paper tape on which a layer of a pulp 2 is located and which is moved in the direction of the arrow M over a group of scrapers 3 away.
  • the pulp 2 is sprayed onto the beginning of the screen belt 1 on this.
  • the squeegee strips 3 are each formed on their upper side with a support 4 made of a wear-resistant material.
  • Below the squeegee 3 is a suction box 5, in the interior 51, a negative pressure of about -2 mbar to -700 mbar.
  • the squeegee 3 are located on a support frame 52 which is releasably secured to the top of the suction box 5.
  • the screen belt 1 which may extend over a length of up to about 50 m and may have a width of 2 m up to 12 m, is conveyed, by means of conveyor rollers located in the installation, over the squeegee blades 3 at a speed of e.g. 1 m / sec to 40 m / sec away.
  • the squeegee 3 are usually, but not mandatory, made of acid-resistant stainless steel, made of a plastic, such as polyethylene, or made of a glass fiber reinforced plastic.
  • the suction box 5 is also usually made of acid-resistant stainless steel.
  • the supports 4 located on the support strips 3 are preferably plates made of a ceramic material, for example Al oxide (hardness HV 0.5 18000 N / mm 2 ), Zr oxide (hardness HV 0.5 12700 N / mm 2 ), Si Nitride (hardness HV 0.5 18800 N / mm 2 ), Si carbide (hardness HV 0.5 28150 N / mm 2 ).
  • In 1A are a squeegee 3 with a wear-resistant support 4 and moving across them away the wire 1, on which the pulp 2 is shown.
  • the screen belt 1 which consists of a fabric, for example made of polyamide or polyester, in the longitudinal direction of the wire 1 aligned warp threads 1a and in the transverse direction of the wire 1 aligned weft threads 1b.
  • the squeegee strips 3 may be formed on their in the operating position the screen belt 1 facing upper side with a plurality of ceramic plates, which in the direction of the squeegee lengths of, for example, 12 mm to 230 mm and transverse to the squeegee widths, for example 12th mm to 100 mm and further heights of for example 2 mm to 10 mm.
  • the hardnesses of these ceramic plates are preferably HVO, 5 12700 N / mm 2 to HVO, 5 28150 N / mm 2 .
  • the surfaces of the wiper strips 3, in particular the ceramic plates 4, are ground flat according to the prior art, having surface roughness values Ra of 0.15 ⁇ m to 0.7 ⁇ m.
  • FIG.2 a stripping strip 3 according to the invention is shown.
  • This squeegee 3 differs from a squeegee according to the prior art, characterized in that the ceramic plates 41 located at the top thereof are formed on their the Siebband 1 in a plant for producing a paper tape facing top with elevations and / or depressions, wherein the height difference of Elevations compared to the wells 0.1 mm to 1.6 mm.
  • These elevations or depressions in particularly preferred embodiments of the invention described below in various variants, have a profiling with a defined cross-sectional shape and distribution over the surface of the ceramic plates 41.
  • the dimensions and the material of the ceramic plates 41 are preferably those according to the prior art described above.
  • FIG.3 is a first embodiment of a present invention on a stripper 3 ceramic plate 41, which is formed on its surface with a profiling shown.
  • This ceramic plate 41 which has a width B of, for example, 8 mm to 70 mm, preferably 12 mm to 25 mm, and a height of, for example, 2 mm to 10 mm in the direction of movement M of the wire 1, is longitudinally on its surface the squeegee 3 extending, triangular in cross-section or sawtooth-like ribs 42 provided with upper edges 45, which are located in the areas of lying between the edges 45 flanks 43 recesses.
  • the width B1 of a rib 42 is, for example, 1 mm to 16 mm, preferably 2 mm to 6 mm, and the height difference T between the edges 45 of the ribs 42 and the bottom of the depressions 43 is at least 0.1 mm, preferably up to 1.6 mm, more preferably 0.2 mm to 0.8 mm.
  • the lateral areas 44 of this ceramic plate 41 which have a width A of, for example, 1 mm to 8 mm, preferably from 2 mm to 6 mm, are formed planar.
  • this ceramic plate 41 is formed according to the invention defined profiling, consisting of elevations or depressions, wherein the cross-section sawtooth ribs 42 with the edges 45, the elevations and located between the edges 45 areas of the flanks of the sawtooth-like ribs 42 Form recesses 43.
  • the described embodiment of the surface of the squeegee 3, in particular the surfaces of the ceramic plates 41, particularly preferably but not necessarily with a defined profiled surface, is based on the finding that by the invention relatively large elevations or depressions in the movement of the screen belt. 1 Be reduced over the squeegees away occurring friction resistance up to about 50%, which on the one hand a significant reduction in the Drive power for the wire 1 is achievable and on the other hand, the service life of the wire 1 and the squeegee 3 are significantly extended.
  • this effect is achieved in that on the one hand, the screen belt 1 in the areas of the recesses 43 on the surface of the scraper blade 3 and the surface of the ceramic plates 41 is not applied, whereby in these areas no frictional resistances occur, and on the other hand due
  • the movement of the screen belt 1 in the liquid located in the recesses 43 6 bow waves 61 occur through which the screen belt 1 in the areas of the surveys 42, in particular the edges 45, is lifted over this or through which between the surveys and the wire belt 1 fluid passes through which the frictional resistance between the elevations and the wire belt 1 are greatly reduced.
  • FIG.4 A further embodiment of a ceramic plate 41a defined in accordance with the invention and having a width B is shown in which between the lateral regions 44a which form the elevations and which have a width A of, for example, 1 mm to 8 mm, preferably 2 mm to 6 mm, have a depression 43a, the depth of which relative to the lateral regions 44a being at least 0.1 mm to preferably 2.5 mm, particularly preferably 0.2 mm to 0.8 mm.
  • a ceramic plate 41b according to the invention with a width B are located between the lateral regions 44b with a width A elevations in the form of rectangular in cross-section ribs 42b and depressions in the form of rectangular grooves 43b, which widths B2 and B3 of example 1 mm to 10 mm, preferably from 2 mm to 8 mm, the height difference T2 between the elevations formed by the ribs 42b and the depressions formed by the grooves 43b being at least 0.1 mm to preferably 3.0 mm, particularly preferably 0.2 mm to 0.8 mm.
  • a ceramic plate 41c according to the invention with a width B is between two lateral regions 44c with a width A a wave-like profiling with ribs 42c and intervening in cross-section concave recesses 43c, wherein the distance B4 between two recesses 43c, for example, 1 mm to 20 mm, preferably 2 mm to 8 mm, and the height difference T3 between the tops of the ribs 42c and the bottoms of the recesses 43c at least 0.1 mm to preferably 3.0 mm, particularly preferably 0.2 mm to 0.8 mm, is.
  • the elevations 44a, 42b, 42c and recesses 43a, 43b, 43c of the in FIG.4 to FIG.4B illustrated embodiments of the invention are aligned in the longitudinal direction of the squeegee 3 and preferably extend over the entire length of the ceramic plates 41a, 41b, 41c.
  • the defined profiling is formed by elevations in the form of rectangular ribs 42d and recesses therebetween in the form of rectangular grooves 43d, which widths B5 and B6, for example, 1 mm to 10 mm, preferably from about 2 mm 8 mm, and a height difference T4 of at least 0.1 mm to preferably 3.0 mm, more preferably from 0.2 mm to 0.8 mm.
  • the longitudinal extent of the ribs 42d and the recesses 43d therebetween concludes with the Longitudinal extension of the squeegee 3 an angle W1 from 0 ° to 80 °, preferably from 30 ° to 55 °, a.
  • FIG.6A and FIG.6B Further embodiments shown of two ceramic plates 41e, 41f according to the invention are formed with profiled elements in the form of closely adjacent concave recesses 43e and cylindrical recesses 43f on a substantially planar surface, optionally slightly curved as described below, which are spaced from each other.
  • the distances B7 between the centers of two adjacent recesses 43e and 43f for example, 1 mm to 20 mm, preferably 2 mm to 12 mm, and the depths T5 of the recesses at least 0.1 mm to preferably 3.0 mm, especially preferably 0.2 mm to 0.8 mm.
  • the recesses may also have a different shape, in particular an oblong or elliptical shape, both in plan view and in cross-section.
  • inventive ceramic plate 41g corresponds to the embodiment according to FIG.3 with cross-sectional sawtooth ribs 42g having edges 45g which form the protuberances and depressions 43g in the regions of the flanks of the saw-toothed ribs 42g, the lateral regions 44g having a width F of, for example, 1 mm to 20 mm, preferably 2 mm to 8 mm, outwardly at an angle of, for example, 2 ° to 10 °, preferably from 3 ° to 6 °, are formed sloping and further the outer edges with a radius R of, for example, 0.5 mm to 5 mm, preferably from 1 mm to 3 mm, rounded off.
  • the surfaces of the scraper bars 3a ceramic plates 4a a bulge or they are convex in cross-section, whereby the screen belt 1 assumes a wave-like overall course.
  • the squeegee 3a are located on a support frame 52a, which is releasably secured to the suction box 5.
  • the radius R1 of the curved, in cross-section convex surfaces of the scraper strips 3a ceramic plates 4a for example, 100 mm to 500 mm, preferably 200 mm to 350 mm.
  • the side edges of the wiper strips 3a are rounded, wherein the radius R2 of the rounding of the side edges, for example, 0.5 mm to 5 mm, preferably 1 mm to 3 mm.
  • the inventive design of squeegees is particularly advantageous in such squeegee, which are located on a suction box.
  • the squeegee can be provided with pads made of ceramic plates.
  • the squeegee can also be made entirely of polyethylene, where they are not coated with ceramic plates.
  • the surfaces are formed with a profiling in the form of elevations and / or depressions with a vertical extent of at least 0.1 mm to preferably 3.0 mm.

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  • Paper (AREA)
  • Container, Conveyance, Adherence, Positioning, Of Wafer (AREA)
EP18188284.6A 2017-08-28 2018-08-09 Abstreifleiste zur verwendung in einer anlage zur herstellung eines papierbandes Withdrawn EP3450625A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ATA344/2017A AT519874B1 (de) 2017-08-28 2017-08-28 Abstreifleiste zur Verwendung in einer Anlage zur Herstellung eines Papierbandes, Bausatz und Anlage zur Herstellung eines Papierbandes

Publications (1)

Publication Number Publication Date
EP3450625A1 true EP3450625A1 (de) 2019-03-06

Family

ID=64131994

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18188284.6A Withdrawn EP3450625A1 (de) 2017-08-28 2018-08-09 Abstreifleiste zur verwendung in einer anlage zur herstellung eines papierbandes

Country Status (9)

Country Link
US (1) US20190062995A1 (pt)
EP (1) EP3450625A1 (pt)
JP (1) JP2019039125A (pt)
CN (1) CN109423912A (pt)
AT (1) AT519874B1 (pt)
BR (1) BR102018016901A2 (pt)
CA (1) CA3015246A1 (pt)
RU (1) RU2018130836A (pt)
TW (1) TW201920805A (pt)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4420370A (en) * 1982-07-19 1983-12-13 Jwi Ltd. Pulp agitating device and method having multiple protruding inserts
US4425188A (en) * 1981-03-28 1984-01-10 Mitsubishi Jukogyo Kabushiki Kaisha Forming shoes for the twin-wire former of a paper making machine
US4687549A (en) * 1986-01-08 1987-08-18 M/K Systems, Inc. Hydrofoil blade
EP0350827A2 (de) * 1988-07-14 1990-01-17 CERASIV GmbH INNOVATIVES KERAMIK-ENGINEERING Schlitzsauger
US5080760A (en) * 1989-06-08 1992-01-14 Jwi Ltd. Pressurized forming board
US5735330A (en) * 1994-04-12 1998-04-07 Jwi Ltd. Formation in a two fabric paper machine

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3513320A1 (de) * 1985-04-13 1986-10-23 Feldmühle AG, 4000 Düsseldorf Streichleiste fuer eine papiermaschine
JP2586312Y2 (ja) * 1990-03-13 1998-12-02 株式会社 堀河製作所 製紙用フォイル
US6126786A (en) * 1998-06-18 2000-10-03 White; James D. Apparatus and method of generating stock turbulence in a fourdrinier forming section

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4425188A (en) * 1981-03-28 1984-01-10 Mitsubishi Jukogyo Kabushiki Kaisha Forming shoes for the twin-wire former of a paper making machine
US4420370A (en) * 1982-07-19 1983-12-13 Jwi Ltd. Pulp agitating device and method having multiple protruding inserts
US4687549A (en) * 1986-01-08 1987-08-18 M/K Systems, Inc. Hydrofoil blade
EP0350827A2 (de) * 1988-07-14 1990-01-17 CERASIV GmbH INNOVATIVES KERAMIK-ENGINEERING Schlitzsauger
US5080760A (en) * 1989-06-08 1992-01-14 Jwi Ltd. Pressurized forming board
US5735330A (en) * 1994-04-12 1998-04-07 Jwi Ltd. Formation in a two fabric paper machine

Also Published As

Publication number Publication date
JP2019039125A (ja) 2019-03-14
US20190062995A1 (en) 2019-02-28
CN109423912A (zh) 2019-03-05
RU2018130836A (ru) 2020-02-27
BR102018016901A2 (pt) 2019-04-16
AT519874B1 (de) 2018-11-15
CA3015246A1 (en) 2019-02-28
AT519874A4 (de) 2018-11-15
TW201920805A (zh) 2019-06-01

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