US20050051289A1 - Former and headbox for said former - Google Patents

Former and headbox for said former Download PDF

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Publication number
US20050051289A1
US20050051289A1 US10/466,354 US46635404A US2005051289A1 US 20050051289 A1 US20050051289 A1 US 20050051289A1 US 46635404 A US46635404 A US 46635404A US 2005051289 A1 US2005051289 A1 US 2005051289A1
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US
United States
Prior art keywords
headbox
former
wall
channels
nozzle
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
US10/466,354
Other languages
English (en)
Inventor
Alfred Bubik
Joachim Henssler
Petra Resch
Alexander Wassermann
Wolfang Ruf
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 Paper 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 Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Assigned to VOITH PAPER PATENT GMBH reassignment VOITH PAPER PATENT GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BUBIK, ALFRED, HENSSLER, JOACHIM, RESCH, PETRA, RUF, WOLFGANG, WASSERMANN, ALEXANDER
Publication of US20050051289A1 publication Critical patent/US20050051289A1/en
Abandoned 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
    • 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
    • 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
    • D21F1/02—Head boxes of 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
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/026—Details of the turbulence section
    • 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
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/028—Details of the nozzle section
    • 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
    • D21F1/04—Head boxes of cylinder machines
    • D21F1/046—Head boxes of cylinder machines with non-immersed cylinder

Definitions

  • the present invention relates to a machine a machine for the production of a fibrous web, and, more particularly, to a former and former headbox.
  • suction formers With suction formers, a longitudinal orientation of the fibers occurs at an appropriate increase in the operating speed of the paper machine in question. This may limit the scope of application of such suction formers to low operational speeds.
  • the present invention provides an improved former and former headbox whereby the cited problems are eliminated.
  • the present invention provides a former, particularly a suction former of a machine for the production of a fibrous web, particularly a paper or cardboard web comprising a headbox equipped with at least one stock suspension feed, one turbulence block equipped with several channels and/or a tube generator equipped with several channels, and a headbox nozzle whose suspension jet strikes an exposed or open surface of a dewatering belt, specifically a wire.
  • Turbulence generating elements are allocated to at least a section of the channels and/or the headbox nozzle, in order to create turbulent flows in the suspension substreams in the channels, or in the headbox nozzle.
  • the side of the suspension stream facing away from the dewatering belt is covered at least partially by a wall. Based on this configuration, the danger of the suspension stream bursting open is reduced to a minimum.
  • swirling motions of considerably higher intensity than occur on conventional Fourdrinier wire formers are now permissible.
  • the wall can be stationary or in motion.
  • a stationary wall can, for example, be allocated to the headbox on which it can be installed adjustably.
  • the wall can in addition, be permeable to water or impermeable to water.
  • a movable wall or a wall in motion can be in the embodiment of an additional dewatering belt, that can specifically be in the form of a revolving wire.
  • the wall can possess an at least partially curved progression and/or an at least partially straight progression.
  • the lower wall has a maximum length of 90%, preferably of 60%, especially of 30% of the length of the upper wall.
  • at least some of the channels are equipped with the turbulence generating inserts.
  • Such turbulence generating inserts can basically be provided in the channels of a respective turbulence block and/or in the channels of a respective tube generator.
  • the present invention provides an improved former, particularly a suction former or twin wire former for a machine for the production of a fibrous web, specifically a paper or cardboard web, in which the previously cited problems are eliminated.
  • a former specifically a suction former or twin wire former of a machine for the production of a fibrous web, specifically a paper or cardboard web
  • a headbox that is equipped with at least one stock suspension feed
  • one turbulence block equipped with several channels and/or a tube generator equipped with several channels and a headbox nozzle.
  • Turbulence generating elements are allocated to at least a section of the channels in order to create turbulent flows that rotate in the same direction in the suspension substreams in the channels. Same directional turbulence movement suppresses the undesirable stripes.
  • helix type spirals are installed in at least a section of the channels in order to create turbulent flows that rotate in the same direction.
  • Such helix type spirals can, for example, be installed in the channels of a turbulence block and/or in the channels of tube generator.
  • the creation of turbulences through the means of helix type spirals can for example occur as described in U.S. Pat. No. 5,876,464.
  • turbulent flows that are rotating in the same direction can be created particularly by the fact that, in a headbox comprising a tube generator, the supply of stock suspension through nozzles into a respective tube channel occurs asymmetrically and preferably at least essentially tangentially to the tube wall, relative to a center plane progressing in longitudinal direction through the tube channel.
  • the stock suspension is fed through nozzles only on one side of the center plane respectively.
  • suspension supplied to the relevant pipe channels is fed into the various pipe channels through nozzles always on the same side of the respective center planes.
  • the headbox can be equipped with at least one feed for dilution water, air, chemicals and/or similar substances.
  • the supply of dilution water, air, chemicals and/or similar substances may essentially occur in axial direction of a respective channel.
  • the wall can be located in an area opposite the forming roll and can be at least partially curved according to a radius of curvature that is preferably larger than or equal to the radius of the forming roll. Basically however, a smaller radius is also feasible, at least in sections.
  • the wall can for example be stationary. Thereby it would preferably cover the circumferential surface of the forming roll, that is in a range of approximately 100 to approximately 400 mm.
  • the stationary wall can particularly be rigid, deflection resistant or not deflection resistant.
  • the wall in accordance with an additional advantageous design of the present invention whereby the wall is again provided in an area opposite the forming roll and is curved, at least partially, according to a curvature radius that is preferably larger than or equal to the radius of the forming roll, the wall can be movable or in motion and can be formed by an additional dewatering belt, particularly a revolving wire.
  • the wall preferably covers a circumferential area of this forming roll that is in the range of approximately 100 mm to approximately 1500 mm and/or corresponds with a circumferential angle of the forming roll of approximately 25° to approximately 120°.
  • the additional dewatering belt that forms the wall can be routed around a breast roll, prior to the area covering the forming roll, when viewed in the direction of belt travel.
  • the curvature radius of the wall in the area covering the forming roll is preferably larger than the radius of the breast roll, or respectively the corresponding curvature radius of the wall in the area of this breast roll.
  • the headbox nozzle can be sectioned by at least one lamellar plate.
  • a configuration without lamellar plates is also feasible.
  • at least one lamellar plate and/or at least one nozzle wall exhibit contours, especially swirl-producing washboard contours.
  • At least one lamellar plate and/or at least one nozzle wall can have contours that serve to generate turbulent motion.
  • At least one lamellar plate and/or at least one nozzle wall can for example be equipped with at least one interference body.
  • the at least one interference body of the at least one nozzle wall is in the form of preferably a discontinuous tapering of the cross section. This formation provides a fluidic ideal turbulence chamber.
  • at least one lamellar plate has a length not exceeding 70% of the length of the headbox nozzle.
  • the headbox nozzle should be as short as possible.
  • the headbox nozzle should preferably be shorter than approximately 400 mm. It is also advantageous if the outlet cross section of the channels or pipes is at least essentially round, since a square outlet cross section would dampen the effect.
  • a headox is furthermore disclosed especially for a former of the relevant type previously described.
  • a headbox includes at least one stock suspension feed, one turbulence block equipped with several channels and/or a tube generator equipped with several channels and a headbox nozzle.
  • Turbulence generating elements are allocated to at least a section of the channels in order to create turbulent flows that rotate in the same direction in the suspension sub-streams in the channels.
  • a headbox particularly for a former of the type previously described is provided, including at least one stock suspension feed, one turbulence block equipped with several channels and/or a tube generator equipped with several channels and a headbox nozzle. Turbulence generating elements are allocated to at least a section of the channels in order to create turbulent flows, rotating in the same direction, in the suspension sub-streams in the channels.
  • FIG. 1 is a partially schematic side view of an embodiment of a suction former of the present invention whose headbox includes a turbulence block that is equipped with turbulence generating inserts, and that is equipped with a stationary preferably adjustable wall, that covers the suspension stream, at least partially, on one side;
  • FIGS. 2-2 d are cross-sectional views of various designs of the turbulence generating inserts of the present invention, viewed in the direction of arrow V in FIG. 1 ;
  • FIG. 3 is a schematic cross-sectional view of a headbox equipped with tube generator, as viewed along line I-I in FIG. 4 , whereby the feeding of the stock suspension through nozzles into a respective tube channel occurs asymmetric and at least essentially tangential to the tube wall;
  • FIG. 4 is a schematic longitudinal section of an embodiment of the headbox of the present invention.
  • FIG. 5 is a schematic longitudinal section of an embodiment of headbox of the present invention including a turbulence block or tube generator into whose channels, at least into sections, helix type spirals or helix are installed;
  • FIG. 6 is a schematic side view of an embodiment of a former of the present invention with a movable wall, or a wall in motion that is formed by an additional dewatering belt and is located in an area opposite the forming roll and that covers a certain circumferential length of this forming roll;
  • FIG. 7 is a schematic longitudinal sectional view of an embodiment of a headbox nozzle, of the present invention that is sectioned by at least one lamellar plate, whereby at least one lamellar plate is equipped with at least one interference body;
  • FIG. 8 is a schematic perspective view of an embodiment of a headbox nozzle of the present invention that is sectioned by at least one lamellar plate, whereby at least one lamellar plate has a washboard contour;
  • FIG. 9 is a schematic side view of an embodiment of a headbox of the present invention sectioned by at least one lamellar plate, whereby the upper and lower nozzle wall respectively are contoured.
  • FIG. 1 there is shown a schematic side view of a former 10 , which in this example is a suction former of a machine for the production of a fibrous web that may specifically be a paper or cardboard web.
  • a former 10 which in this example is a suction former of a machine for the production of a fibrous web that may specifically be a paper or cardboard web.
  • a headbox 12 that is allocated to this former 10 includes a stock suspension feed 14 , at least one turbulence block 18 that is equipped with several channels 16 and a headbox nozzle 20 whose suspension stream 22 strikes an exposed, that is an open surface 24 ′ of dewatering belt 24 , which in this example is a wire.
  • Turbulence generating elements 26 are allocated to at least one section of channels 16 , in order to create turbulent flows 28 in the suspension substreams that are guided through the channels (also see FIG. 2 ). These turbulent flows 28 are illustrated schematically in FIGS. 2-2 d , which show front views of various designs of the turbulence generating inserts, in the direction of arrow V in FIG. 1 .
  • wall 30 is stationary, installed preferably adjustably on headbox 12 .
  • wall 30 can, for example, be connected via link 32 with headbox nozzle 20 .
  • Wall 30 that is mounted on headbox nozzle 20 in this manner can be adjusted through pivoting by adjustment elements 34 .
  • Headbox nozzle 20 can, for example, be sectioned by at least one lamellar plate 36 .
  • wall 30 is curved at least slightly in the area of coverage.
  • Wall 30 can, for example, be located in an area opposite forming roll 38 .
  • wall 30 is curved in accordance with a radius of curvature R 1 , that is larger than the radius R 2 of the forming roll 38 .
  • Wall 30 can include an upper wall shown at 30 and lower wall 30 ′.
  • Lower wall 30 ′ has a lower wall length not greater than 90%, preferably 60%, especially 30% of an upper wall length.
  • Stationary wall 30 can for example cover a circumferential length L of forming roll 38 , that is in a range of approximately 100 to approximately 400 mm.
  • the circumferential angle of forming roll 38 resulting from a respective circumferential length L is indicated as “ ⁇ ”.
  • the stationary wall may be rigid, deflection resistant or not deflection resistant.
  • Curvature radius R 1 of wall 30 can, if necessary, be larger than or equal to radius R 2 of forming roll 38 . In certain instances a smaller curvature radius R 1 is also feasible.
  • an additional dewatering belt 40 especially a wire is provided that is brought together with dewatering belt 24 at a location A.
  • at least one disturbance body 60 of at least one nozzle wall 30 is designed as preferably a discontinuous tapering of cross section 64 (shown as broken lines). The tapering of the cross section may however also occur continuously and/or randomly.
  • wall 30 is impermeable to water.
  • this type of wall may basically also be water permeable, especially if a movable wall or a wall in motion is provided in the embodiment of a dewatering belt, such as especially a wire.
  • FIGS. 3 and 4 are schematic illustrations of headbox 12 including tube generator 42 that is equipped with several channels 16 whereby turbulence generating elements are allocated to at least a section of channels 16 , in order to create turbulent flows 28 that rotate in the same directions in the suspension sub-streams in the relating channels 16 .
  • the turbulence generating elements in the present example include nozzles 44 through which the supply of stock suspension into a respective tube channel 16 occurs asymmetrically and at least essentially tangentially to tube wall 46 . Supply of the stock suspension through the nozzles occurs asymmetrically, relative to center plane E progressing in longitudinal direction through tube channel 16 . In the present example this is always only on one side of this center plane E. As can be seen in FIG. 3 , feeding into the various tube channels 16 through the nozzles always occurs on the same side of the center plane E, for example the right side in FIG. 3 , resulting in same directional rotation of the various turbulent flows 28 .
  • headbox 12 in addition to stock suspension feed 14 , headbox 12 can additionally be equipped with at least one inlet 48 for dilution water, air, chemicals and/or other substances. As seen in FIG. 4 the supply of dilution water, air, chemicals and/or similar substances can essentially occur in an axial direction of a respective channel.
  • headbox nozzle 20 can be provided with or without lamellar plates.
  • a turbulence block 18 can also be provided alternatively or in addition to the tube generator 42 .
  • an intermediate chamber 50 can be provided, for example, following tube generator 42 which is equipped with rotation channels 16 .
  • the rotational flow is produced by the asymmetric or tangential inflow of suspension.
  • FIG. 5 is a schematic longitudinal sectional view of another design form of a headbox 12 , including tube generator 42 .
  • a turbulence block can again be provided alternatively or in addition.
  • helix-type spiral or helix 52 are installed in at least a section of channels 16 of tube generator 42 , or in the turbulence block, for the purpose of producing turbulent flows rotating in the same direction.
  • headbox 12 also includes stock suspension feed 14 , a headbox nozzle 20 and a stationary, preferably adjustable wall 30 .
  • Headbox nozzle 20 can be sectioned by at least one lamellar plate 36 , or can also be configured withouth lamellar plates.
  • Helix-type spirals 52 can be configured and installed specifically so that same-directionally rotating turbulent flows again occur. Moreover, a respective rotational flow initiated by a relating helix-type spiral 52 can be produced, for example, as described in U.S. Pat. No. 5,876,564.
  • an acceleration segment a of the headbox is followed by a section b that shows helix-type spirals 52 . This is followed by a section c, for example constant deceleration or acceleration, further followed by an additional acceleration section d. A deceleration occurs in a subsequent section e.
  • FIG. 6 is a schematic partial illustration of former 10 that is equipped with a movable wall 30 , or a wall in motion, that is formed by an additional dewatering belt 54 and that is located in area opposite forming roll 38 and that covers a certain circumferential length L of forming roll 38 .
  • former 10 also includes dewatering belt 24 that is routed around forming roll 38 and is formed particularly by a wire, and has headbox 12 whose suspension stream 22 is directed into the area between forming roll 38 and breast roll 56 , around which dewatering belt 54 that forms wall 30 is routed prior to the area that covers forming roll 38 , viewed in direction of belt travel 1 .
  • Dewatering belt 54 can also specifically be a wire. After forming roll 38 , two dewatering belts 24 , 54 are run over an additional forming element 58 .
  • movable wall 30 that is formed by dewatering belt 54 is curved, at least partially according to a curvature radius R 1 that is preferably larger than or equal to radius R 2 of forming roll 38 .
  • Movable wall 30 can, for example, cover a circumferential length L of the forming roll 38 that is in a range of approximately 100 to approximately 1500 mm and/or corresponds with a circumferential angle a of forming roll 38 of approximately 25° to approximately 120°.
  • the additional dewatering belt 54 that forms wall 30 can be routed around breast roll 56 , prior to the area covering forming roll 38 , when viewed in direction of travel 1 .
  • Curvature radius R 1 of wall 30 in the area covering forming roll 38 is preferably larger than radius R 3 of the breast roll, or respectively the corresponding curvature radius R 3 of wall 30 in the area of this breast roll 56 .
  • FIG. 7 is a schematic longitudinal sectional view of headbox nozzle 20 that is sectioned by at least one lamellar plate 36 , whereby at least one lamellar plate 36 is equipped with at least one interference body 60 in order to provide a turbulence generating profile. Moreover, at least one lamellar plate 36 has a length not exceeding 70% of the length of the headbox nozzle 20 . At least one lamellar plate 36 and/or at least one nozzle wall 20 ′, 20 ′′ can have contours that serve to generate turbulent motion.
  • FIG. 8 is a schematic, perspective partial view of headbox nozzle 20 that is sectioned by at least one lamellar plate 36 , whereby at least one lamellar plate 36 has a swirl-producing contour, in this example a washboard contour. At least one lamellar plate 36 and/or at least one nozzle wall 20 ′, 20 ′′ can possess this type of swirl-producing contour, for example in the form of a washboard contour.
  • FIG. 9 is a schematic longitudinal view of headbox 20 , that is sectioned by at least one lamellar plate 36 , where the upper and lower nozzle wall 20 ′ or 20 ′′ respectively are contoured so that turbulence generating edges 62 are created in the flow area.
  • a respective headbox nozzle 20 should be as short as possible, whereby headbox nozzle 20 is preferably shorter than approximately 400 mm.
  • the outlet cross section of channels 16 or pipes is preferably at least essentially round, since a square cross section would dampen the effect.

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US10/466,354 2001-01-18 2002-01-17 Former and headbox for said former Abandoned US20050051289A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10102198.4 2001-01-18
DE10102198A DE10102198A1 (de) 2001-01-18 2001-01-18 Former sowie Stoffauflauf für einen solchen Former
PCT/EP2002/000415 WO2002063097A2 (de) 2001-01-18 2002-01-17 Former sowie stoffauflauf für einen solchen former

Publications (1)

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US20050051289A1 true US20050051289A1 (en) 2005-03-10

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Application Number Title Priority Date Filing Date
US10/466,354 Abandoned US20050051289A1 (en) 2001-01-18 2002-01-17 Former and headbox for said former

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US (1) US20050051289A1 (de)
EP (1) EP1366233A2 (de)
DE (1) DE10102198A1 (de)
WO (1) WO2002063097A2 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006120294A1 (en) * 2005-05-06 2006-11-16 Metso Paper, Inc. Web-forming unit of a paper or board machine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10245157A1 (de) * 2002-09-27 2004-04-08 Voith Paper Patent Gmbh Stoffauflauf
DE102008000778A1 (de) 2008-03-20 2009-09-24 Voith Patent Gmbh Stoffauflauf für eine Papier- oder Kartonmaschine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5603807A (en) * 1992-11-26 1997-02-18 J. M. Voith Gmbh Paper machine headbox with longitudinally shiftable contoured wall
US5617896A (en) * 1995-05-16 1997-04-08 Neles-Jamesbury Oy Valve having a closure member for creating flow turbulence in the valve
US5876564A (en) * 1995-10-20 1999-03-02 Institute Of Paper Science And Technology, Inc. Methods and apparatus to enhance paper and board forming qualities
US6153057A (en) * 1995-10-20 2000-11-28 Institute Of Paper Science And Technology, Inc. Methods and apparatus to enhance paper and board forming qualities

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Publication number Priority date Publication date Assignee Title
JPS602792A (ja) * 1983-06-20 1985-01-09 三菱重工業株式会社 抄紙機のヘツドボツクス
FI905896A (fi) * 1990-11-29 1992-05-30 Valmet Paper Machinery Inc Formningsgapsarrangemang i en dubbelviraformare av en pappersmaskin.
US6210535B1 (en) * 1995-06-01 2001-04-03 Valmet Corporation Stock feed system for a multi-layer headbox and method in the operation of a multi-layer headbox
US6146500A (en) * 1998-06-19 2000-11-14 Kimberly-Clark Worldwide, Inc. Suction breast roll former and method, with flexible headbox roof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5603807A (en) * 1992-11-26 1997-02-18 J. M. Voith Gmbh Paper machine headbox with longitudinally shiftable contoured wall
US5617896A (en) * 1995-05-16 1997-04-08 Neles-Jamesbury Oy Valve having a closure member for creating flow turbulence in the valve
US5876564A (en) * 1995-10-20 1999-03-02 Institute Of Paper Science And Technology, Inc. Methods and apparatus to enhance paper and board forming qualities
US6153057A (en) * 1995-10-20 2000-11-28 Institute Of Paper Science And Technology, Inc. Methods and apparatus to enhance paper and board forming qualities

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006120294A1 (en) * 2005-05-06 2006-11-16 Metso Paper, Inc. Web-forming unit of a paper or board machine
AT504008B1 (de) * 2005-05-06 2008-08-15 Metso Paper Inc Bahnausbildungseinheit einer papier- oder kartonmaschine

Also Published As

Publication number Publication date
WO2002063097A3 (de) 2003-02-20
WO2002063097A2 (de) 2002-08-15
DE10102198A1 (de) 2002-08-22
EP1366233A2 (de) 2003-12-03

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AS Assignment

Owner name: VOITH PAPER PATENT GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BUBIK, ALFRED;HENSSLER, JOACHIM;RESCH, PETRA;AND OTHERS;REEL/FRAME:015910/0534

Effective date: 20040830

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION