WO1998044193A1 - Dispositif pour extraire un liquide d'une bande fibreuse - Google Patents

Dispositif pour extraire un liquide d'une bande fibreuse Download PDF

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Publication number
WO1998044193A1
WO1998044193A1 PCT/US1998/004286 US9804286W WO9844193A1 WO 1998044193 A1 WO1998044193 A1 WO 1998044193A1 US 9804286 W US9804286 W US 9804286W WO 9844193 A1 WO9844193 A1 WO 9844193A1
Authority
WO
WIPO (PCT)
Prior art keywords
blades
blade
web
machine direction
control system
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.)
Ceased
Application number
PCT/US1998/004286
Other languages
English (en)
Inventor
Richard W. Philips
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.)
Beloit Technologies Inc
Original Assignee
Beloit Technologies Inc
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 Beloit Technologies Inc filed Critical Beloit Technologies Inc
Priority to AU64480/98A priority Critical patent/AU6448098A/en
Priority to CA002325855A priority patent/CA2325855A1/fr
Publication of WO1998044193A1 publication Critical patent/WO1998044193A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • D21F1/48—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
    • D21F1/48—Suction apparatus
    • D21F1/483—Drainage foils and bars
    • D21F1/486—Drainage foils and bars adjustable
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type

Definitions

  • TITLE APPARATUS FOR REMOVING FLUID FROM A FIBROUS WEB
  • the invention relates to papermaking machinery, and more particularly to apparatus for removing fluid from a fibrous web in a papermaking machine. Still more particularly, the invention relates to a curved inverted vacuum box.
  • a known type of twin-wire or twin-fabric former is the Bel Bond former, which is designed as a retrofit to an existing fourdrinier wire.
  • Bel Bond is a registered trademark of Beloit Corporation.
  • a Bel Bond former includes a looped top wire cooperating with the existing fourdrinier or bottom wire.
  • the Bel Bond former also includes a curved inverted vacuum box positioned within the loop of the top wire.
  • the curved inverted vacuum box typically includes a box that is made from stainless steel or the like and that defines an enclosure connected to a source of partial vacuum.
  • the box includes a base having a convex curved surface for guiding the top wire.
  • a plurality of dewatering blades, usually ceramic, extend in the cross machine direction and are spaced in the machine direction along the curved surface of the curved inverted vacuum box.
  • the top and bottom wires sandwich the web, and dewatering takes place due to tension of both wires, combined with centrifugal force.
  • the vacuum source urges water upwardly out of the web through the top wire. A portion of water is removed from the formed web downwardly through the bottom wire during movement of the wires and the web over the blades.
  • curved inverted vacuum boxes do not allow changing the drainage pressure from one blade to the next so as to allow experimentation with formation and sheet strength.
  • the invention provides a curved inverted vacuum box in which each blade is loaded independently, thus providing the ability to change the drainage pressure at each blade location. With the consistency of the web or sheet changing along the curved surface of the curved inverted vacuum box, a controlled induced drainage curve can be achieved to follow consistency changes along the curved surface.
  • the invention provides an apparatus for removing fluid from a fibrous web in a papermaking machine, the apparatus comprising a plurality of generally parallel supports that extend in the cross machine direction and that are spaced in the machine direction. Each support has mounted thereon a respective blade extending in the cross machine direction. The blades are spaced in the machine direction along a convex path for movement of the web and, in the preferred embodiment of the invention, the fabrics, over the blades. Each blade is movable relative to its respective support in a direction perpendicular to the web such that outward movement of the blade relative to the support presses the blade against the web.
  • the apparatus also comprises a control system for exerting, on each of the blades, a force in the direction toward the web so as to press the blade against the web. The control system is operable to vary the force exerted on each of the blades independent of the force exerted on the remaining blades.
  • the supports are tee bars extending in the cross machine direction.
  • An air loaded tube is saddled in each tee bar between the tee bar and the base of the respective blade. When the tube is pressurized, a force is exerted, pushing the blade into the fabrics and the web, changing the drainage pressure at the leading and trailing edges of the blade.
  • a control panel equipped with gauges, regulators and air lines connected to the individual air tubes is provided for independent air pressure regulation.
  • Fig. 1 is a partial side elevational of a papermaking machine embodying the invention.
  • Fig. 2 is an enlarged portion of Fig. 1 , partially in section.
  • Fig. 3 is a further enlarged portion of Fig. 2.
  • Fig. 4 is a partial view taken along line 4-4 in Fig. 3.
  • a papermaking machine 10 embodying the invention is partially illustrated in Fig. 1 . More particularly, the portion of the papermaking machine 10 illustrated in Fig. 1 is a Bel Bond former 14. As is known in the art, the Bel Bond former 14 comprises a frame 18 supporting a looped bottom fabric or wire 22 moving in the machine direction (from left to right in Fig. 1 ). A secondary headbox 26 is mounted on the frame 18 above the bottom fabric 22. A fibrous web 30 (see Fig. 3) is supported on top of and moves with the bottom fabric 22. Mounted on the frame 18 downstream of the secondary headbox 26 is (see Fig.
  • a curved inverted vacuum box 38 is mounted on the frame 18 within the endless loop of the top fabric 34.
  • the curved inverted vacuum box 38 includes a box 42 defining an enclosure connected to a source 46 of partial vacuum.
  • the base of the box 38 has a convex curved surface.
  • each tee bar 50 is mounted on the curved surface of the box base.
  • the supports 50 extend in the cross machine direction and are spaced in the machine direction.
  • the supports 50 are tee bars that are generally T-shaped in cross-section.
  • Each tee bar 50 has therein an outwardly or downwardly opening recess 54 extending in the cross machine direction, and each tee bar 50 includes opposed flanges 58 and 62 extending in the machine direction on opposite sides of the recess 54.
  • Each tee bar 50 is secured to the box base by a plurality of bolts 66, as best shown in Figs. 3 and 4.
  • the tee bars 50 have mounted thereon respective blades 70 extending in the cross machine direction.
  • the blades 70 are preferably ceramic, as is known in the art.
  • the blades 70 are spaced in the machine direction along a convex path, as best shown in Fig. 2.
  • the blades 70 face generally downwardly such that the fabrics 22 and 34 and the web 30 pass beneath the blades 70, with the blades 70 pressing against the top fabric 34.
  • Each blade 70 is movable relative to its respective tee bar 50 in a direction generally perpendicular to the web 30 (vertically in Fig. 3) such that outward movement of the blade 70 relative to the tee bar 50 (downward movement in Fig. 3) presses the blade 70 against the top fabric
  • each of the blades 70 is secured to a respective blade base 74 which extends in the cross machine direction and which is generally C-shaped in cross-section.
  • the blade base 74 has therein an inwardly or upwardly opening channel 78 receiving the flanges 58 and 62 of the respective tee bar 50 such that the flanges limit vertical movement of the blade 70 relative to the tee bar 50.
  • Each blade 70 is movable relative to its tee bar 50 between an uppermost position and a lowermost position. In Fig. 3, the left-hand blade 70 is shown in its uppermost position, the right-hand blade 70 is shown in its lowermost position, and the middle blade 70 is shown in an intermediate position between the uppermost and lowermost positions.
  • Each blade base channel 78 and the respective tee bar recess 54 define (see Fig. 4) a variable volume chamber 82 extending substantially the entire length of the blade 70.
  • the chamber 82 has a volume that changes in response to movement of the blade 70 toward and away from the web 30. Specifically, the volume increases in response to downward movement of the blade 70 and decreases in response to upward movement of the blade 70.
  • the curved inverted vacuum box 38 also includes (see Fig. 2) a control system 86 (shown schematically) for exerting, on each of the blades 70, a downward force so as to press the blade 70 against the fabrics 22 and 34 and the web 30.
  • the control system 86 is operable to vary the force exerted on each of the blades 70 independent of the force exerted on the remaining blades 70.
  • the control system 86 includes, for each blade 70, a respective flexible conduit or air tube 90 (Figs. 3 and 4) saddled in the tee bar 50 between the tee bar 50 and the base 74 of the blade 70 (i.e., in the variable volume chamber 82).
  • Each tube 90 extends substantially the entire length of the respective blade 70 and has a closed end (not shown) and an opposite open end (the left end in Fig. 4).
  • the control system 86 includes a source 94 of variable pressure connected to the open end of each tube 90.
  • the control system 86 also includes (see Figs. 2 and 4) air lines 98 connected between the pressure source 94 and the individual air tubes 90.
  • the control system 86 is operable to vary the pressure in each of the tubes 90 independent of the pressure in the remaining tubes 90.
  • the control system 86 includes a control panel (not shown) equipped with gauges, regulators and a manually adjustable control for each tube 90. When a tube 90 is pressurized, the tube 90 expands, increasing the volume of its chamber 82 and pushing the blade 70 downwardly into the fabrics 22 and 34 and the web 30, thereby changing the drainage pressure at the leading and trailing edges of the blade 70.

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  • Paper (AREA)

Abstract

Dispositif pour extraire un liquide d'une bande (30) fibreuse dans une machine de fabrication de papier présentant un sens machine et un sens transversal. Le dispositif comporte une pluralité de supports (50) sensiblement parallèles, disposés dans le sens transversal et espacés dans le sens machine. Ces supports portent des lames (70) respectives orientées dans le sens transversal, ces lames (70) étant espacées dans le sens machine le long d'une trajectoire convexe pour permettre à la bande de défiler par dessus les lames. Chaque lame (70) est mobile par rapport au support (50) respectif dans une direction perpendiculaire à la bande, de façon que le mouvement de la lame vers l'extérieur par rapport au support (50) presse la lame contre la bande (30). Le dispositif comprend en outre un système de commande pour imprimer à chacune des lames (70) une force en direction de la bande (30) ayant pour effet de presser la lame conte la bande, ce système de commande permettant de faire varier la force exercée sur chacune des lames (70) indépendamment de la force exercée sur les autres lames.
PCT/US1998/004286 1997-03-31 1998-03-04 Dispositif pour extraire un liquide d'une bande fibreuse Ceased WO1998044193A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU64480/98A AU6448098A (en) 1997-03-31 1998-03-04 Apparatus for removing fluid from a fibrous web
CA002325855A CA2325855A1 (fr) 1997-03-31 1998-03-04 Dispositif pour extraire un liquide d'une bande fibreuse

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US82960697A 1997-03-31 1997-03-31
US08/829,606 1997-03-31

Publications (1)

Publication Number Publication Date
WO1998044193A1 true WO1998044193A1 (fr) 1998-10-08

Family

ID=25254990

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1998/004286 Ceased WO1998044193A1 (fr) 1997-03-31 1998-03-04 Dispositif pour extraire un liquide d'une bande fibreuse

Country Status (3)

Country Link
AU (1) AU6448098A (fr)
CA (1) CA2325855A1 (fr)
WO (1) WO1998044193A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002048455A1 (fr) * 2000-12-15 2002-06-20 Astenjohnson, Inc. Caisse aspirante dotee de pale d'ecumoire
US6982025B2 (en) 2000-12-15 2006-01-03 Astenjohnson, Inc. Adjustable resilient blade support
WO2009065433A1 (fr) * 2007-11-19 2009-05-28 Metso Paper, Inc. Procédé et dispositif pour transférer une bande de papier d'un tissu de soutien sur un autre
CN102277770A (zh) * 2007-11-19 2011-12-14 美卓造纸机械公司 传送吸箱

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0552139A1 (fr) * 1992-01-17 1993-07-21 Valmet Paper Machinery Inc. Section de formage pour une machine à papier
EP0742314A1 (fr) * 1993-11-12 1996-11-13 Valmet Paper Machinery Inc. Section de formage hybride comportant une unité MB dans une machine à papier

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0552139A1 (fr) * 1992-01-17 1993-07-21 Valmet Paper Machinery Inc. Section de formage pour une machine à papier
EP0742314A1 (fr) * 1993-11-12 1996-11-13 Valmet Paper Machinery Inc. Section de formage hybride comportant une unité MB dans une machine à papier

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002048455A1 (fr) * 2000-12-15 2002-06-20 Astenjohnson, Inc. Caisse aspirante dotee de pale d'ecumoire
US6982025B2 (en) 2000-12-15 2006-01-03 Astenjohnson, Inc. Adjustable resilient blade support
US6984291B2 (en) 2000-12-15 2006-01-10 Astenjohnson, Inc. Vacuum box with skimmer blade
WO2009065433A1 (fr) * 2007-11-19 2009-05-28 Metso Paper, Inc. Procédé et dispositif pour transférer une bande de papier d'un tissu de soutien sur un autre
CN102277770A (zh) * 2007-11-19 2011-12-14 美卓造纸机械公司 传送吸箱

Also Published As

Publication number Publication date
CA2325855A1 (fr) 1998-10-08
AU6448098A (en) 1998-10-22

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