WO2008082546A1 - Appareil de caisse de tête pour une machine à papier - Google Patents

Appareil de caisse de tête pour une machine à papier Download PDF

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Publication number
WO2008082546A1
WO2008082546A1 PCT/US2007/025905 US2007025905W WO2008082546A1 WO 2008082546 A1 WO2008082546 A1 WO 2008082546A1 US 2007025905 W US2007025905 W US 2007025905W WO 2008082546 A1 WO2008082546 A1 WO 2008082546A1
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WO
WIPO (PCT)
Prior art keywords
block
downstream
upstream
flow tube
stock
Prior art date
Application number
PCT/US2007/025905
Other languages
English (en)
Inventor
James Ewald
Original Assignee
Paperchine 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
Priority claimed from US11/642,054 external-priority patent/US7794570B2/en
Application filed by Paperchine Inc. filed Critical Paperchine Inc.
Publication of WO2008082546A1 publication Critical patent/WO2008082546A1/fr

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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
    • D21F1/02—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

Definitions

  • the present invention relates to a headbox apparatus for a papermaking machine.
  • the present invention relates to a headbox apparatus for a papermaking machine in which the apparatus defines a flow path for stock flowing between an upstream header and a downstream slice lip.
  • a vertical tube bank is located inside the headbox nozzle and distributes a uniform flow of fluid from the headbox delivery system to the headbox nozzle.
  • the vertical tube bank is located between the pond sides and is trapped by the apron support structure and the top of the headbox nozzle.
  • the fluid or stock is accelerated through the vertical slot openings into rectangular chambers located adjacent to one another.
  • the discharge side of the vertical tube bank is nearly 100% open area into the headbox nozzle.
  • the vertical openings provide a more uniform flow distribution requiring less mixing of individual flow streams and a uniform pressure drop across the tube bank which produces a better basis weight profile.
  • the vertical tube bank is constructed from metallic material.
  • the flow passages in the tube bank are highly polished to prevent fiber from adhering to the surfaces.
  • the tube bank is constructed from multiple segments or is constructed from a single block of material. When constructed from multiple pieces, the tube bank can be welded or glued together. Alternatively, clamping forces are utilized with through bolts to contain the internal forces of the stock pressure.
  • the tube bank is constructed from multiple pieces stacked together to form the vertical tube bank. Multiple distinct sections that change the flow area within the flow chamber are assembled one after the other.
  • the vertical tube bank front and drive side outside flow channels, or multiple front and drive side channels near the front and drive side walls, include a mechanism that alters the flow in these outer slots. This flow alteration provides a tool for controlling fiber orientation.
  • the tube bundle is fixed in location inside the headbox by locating devices.
  • the vertical tube bank upstream surface has a series of vertical slots located on an equal pitch across the entire length of the tube bank.
  • the width of the vertical slots are designed such that the width of the slot can be easily changed. Changing the slot width changes the velocity of the stock flow entering the tube bank resulting in improved fiber distribution.
  • the vertical tube bank is designed such that the range of fluid velocities in the initial section of the tube bank is between 3 and 50 feet per second.
  • the exiting velocity range from the vertical tube bank is 1 to 20 feet per second.
  • the vertical tube bank can be fed from either a cross machine header or multiple flow injection hoses and can be used in combination with a dilution control of the flow leading to the tubebank.
  • the vertical tube bank segments themselves may contain a series of holes that can deliver dilution control water into the cross machine header. The dilution control water is then transported through multiple holes located vertically between the vertical slots. The dilution water is carried into the next adjacent slot.
  • the headbox apparatus includes the following features:
  • the vertical tube bank minimizes the mixing requirements of multiple individual tubes.
  • the mixing of flows is primarily in the cross machine direction, reducing rotational flows and maximizes cross machine mixing.
  • the vertical tube bank is constructed from one or multiple pieces.
  • the vertical tube bank is constructed with a series of slots on equal or near equal pitch across the entire width of the headbox.
  • the front side and drive side slots include a mechanism to alter the flow rate through these slots either by width or entrance configuration.
  • the vertical slot width can be easily modified to increase or decrease the pressure drop across the tube bank.
  • the vertical tube bank is located inside the headbox in the wet end side of the nozzle between the pond sides, apron support structure and nozzle roof.
  • the vertical tube bank is constructed of multiple MD and CD direction adjacent zones with varying open areas.
  • the vertical tube bank discharge side has greater than 85% open area into the nozzle area of the headbox.
  • the vertical tube bank can be utilized in headboxes where the delivery of fluid to the headbox is completed by means of a tapered header or a multiple tube/hose delivery system.
  • the vertical tube bank is operated in conjunction with a dilution control system or without a dilution control system.
  • the vertical tube bank may contain multiple holes to deliver dilution water through the block and into the tapered header.
  • a conventional headbox distributor uses a tube array to spread the pulp slurry as uniformly as possible across the width of a paper machine headbox prior to the start of the drainage or other thickening process.
  • the tube array is generally made up of individual round inlet tubes mounted is some manner to cause acceleration of the flow into each tube from a cross machine header or other form of supply of the slurry prior to the tube array.
  • the pressure drop from the acceleration of the flow at the inlet of each tube within the array is critical to the uniformity of the flow within each tube and therefore to the uniformity of the cross machine uniformity of the headbox in general. This acceleration of the flow is also a factor in the operational cleanliness of the headbox operation.
  • the exit end of a typical tube array may take on many shapes (round, hexagonal, rectangular or square or other shape) but eventually the flows exiting each individual tube must be re-joined prior to or within the nozzle of the headbox prior to discharge to the drainage area.
  • the reorientation of the round tube entrance flow to the eventual rectangular shape of the nozzle will create disturbances in the flow in all directions. These disturbances must be damped or reduced in some way prior to discharge out the slice so as not to cause nonuniformities in the paper web.
  • the purpose of the present invention is to create the necessary pressure drop and subsequent uniform cross machine flow distribution using only vertical channels in the flow distributor. This will minimize non-cross machine flow disturbances improving cross machine uniformity of the flow.
  • the use of only vertical channels also improves the cross machine characteristics of the fiber slurry by minimizing non cross machine forces on the fibers by the fluid flow.
  • the design is equally applicable to headboxes using dilution to control the headbox profile or other mechanical profile controls techniques.
  • the primary feature of the present invention is the provision of a headbox apparatus that overcomes the problems associated with the prior art headboxes and which makes a significant contribution to the papermaking art.
  • Another feature of the present invention is the provision of a headbox apparatus for a papermaking machine that is easier and less costly to manufacture when compared with prior art headboxes.
  • a further feature of the present invention is the provision of a headbox apparatus for a papermaking machine that improves mixing of the pulp prior to discharge thereof to a downstream drainage arrangement.
  • the present invention relates to a headbox apparatus for a papermaking machine.
  • the headbox apparatus defines a flow path for stock flowing between an upstream location and a downstream slice lip.
  • the apparatus includes a plurality of blocks which are anchored within the flow path between the upstream location and the slice lip. Each block and an adjacent block of the plurality of blocks define therebetween a flow tube for the flow therethrough of the stock.
  • the flow tube has an upstream portion having an upstream and a downstream end. Additionally, the flow tube has a downstream portion which has an upstream and a downstream extremity. The upstream extremity of the downstream portion extends from the downstream end of the upstream portion.
  • the downstream portion of the flow tube has a volume which is greater than a further volume of the upstream portion of the flow tube such that when the stock flows from the upstream portion to the downstream portion of the flow tube, the stock is mixed within the downstream portion.
  • the upstream location in one arrangement of the present invention is a cross machine header.
  • the upstream location includes multiple flow injection hoses.
  • the plurality of blocks are fabricated from high density polypropylene.
  • the blocks could be fabricated from stainless steel, ceramic material or synthetic material.
  • each block of the plurality of blocks has a first and a second end and each block has a first portion which extends from the first end of the block. Furthermore, each block has a second portion which extends from the first portion to the second end of the block.
  • the first portion of the block defines a first and a second side, the first side of the first portion being planar.
  • the second side of the first portion is also planar, the second side being disposed spaced and parallel relative to the first side.
  • the second portion of the block defines a first and a second face, the first face of the second portion defining a surface and a further surface.
  • the second face of the second portion defines a facing and a further facing.
  • the first face is disposed spaced and parallel relative to the second face, with the first face and the second face being spaced apart by a distance which is less than a further distance between the first and second sides of the first portion.
  • the second portion of the block defines a first rib which is disposed between the surface and the further surface, the first rib extending between the first portion and the second end of the block.
  • the second portion of the block defines a second rib which is disposed between the facing and the further facing, the second rib extending between the first portion and the second end of the block.
  • the first portion defines a first chamfer which extends between the first side of the first portion and the surface.
  • the first portion defines a second chamfer which extends between the second side of the first portion and the further facing.
  • the arrangement is such that the flow tube is defined between the adjacent blocks so that when stock flows through the upstream portion of the flow tube into the downstream portion of the flow tube, the stock is mixed and is guided between the second rib of the block and the first rib of the adjacent block.
  • the apparatus is structured such that when the stock flows into the downstream portion of the flow tube, a first and second vortex is generated within the downstream portion. The first vortex is disposed adjacent to the facing of the block and between the facing of the block and the surface of the adjacent block.
  • the second vortex is disposed adjacent to the further facing of the block and between the further facing of the block and the further surface of the adjacent block so that mixing of the stock within the downstream portion of the flow tube is enhanced.
  • the first vortex has a rotational direction which is opposite to a further rotational direction of the second vortex for further enhancing mixing of the stock within the downstream portion of the flow tube.
  • the opposite rotational directions of the first and second vortices is predictably achieved by virtue of the chamfer of the adjacent block and by the further chamfer of the block.
  • the chamfer of the adjacent block guides the flow of stock flowing from the upstream portion of the flow tube to generate the first vortex so that the first vortex rotates within the downstream portion of the flow tube in the rotational direction.
  • the further chamfer of the block guides the flow of stock flowing from the upstream portion of the flow tube to generate the second vortex so that the second vortex rotates within the downstream portion of the flow tube in the further rotational direction opposite to the rotational direction so that impact of the first and second vortices on a flow consistency and a velocity uniformity of the stock is reduced.
  • a dilution control system for introducing dilution fluid into the flow tube or upstream thereof for controlling the cross machine basis weight profile of the resultant web.
  • Fig. 1 is a perspective view of a preferred headbox apparatus according to the present invention for a papermaking machine
  • Fig. 2 is an exploded view of the blocks shown in Fig. 1;
  • Fig. 3 is a view taken on the line 3-3 of Fig. 2;
  • Fig. 4 is a view taken on the line 4-4 of Fig. 3;
  • Fig. 5 is a view taken on the line 5-5 of Fig 3;
  • Fig. 6 is a top plan view of a headbox apparatus for a papermaking machine according to another embodiment of the present invention.
  • Fig. 7 is an enlarged view similar to that shown in Fig.6 and shows in more detail the bores for anchoring the elements;
  • Fig. 8 is a perspective view of the arrangement according to the present invention showing a further embodiment;
  • Fig. 9 is a sectional view taken on the line 4-4 of Fig. 6;
  • Fig. 10 is a sectional view taken on the line 5-5 of Fig. 8;
  • Fig. 11 is a sectional view taken on the line 6-6 of Fig. 7;
  • Fig. 12 is a sectional view taken on the line 7-7 of Fig. 7;
  • Fig. 13 is a sectional view taken on the line 8-8 of Fig. 7;
  • Fig. 14 is a sectional view taken on the line 9-9 of Fig. 7;
  • Fig. 15 is a top plan view which is similar to that shown in Fig. 7 but shows another embodiment of the present invention
  • Fig. 16 is a top plan view of the edge flow element shown in Fig. 6;
  • Fig. 17 is a similar view to that shown in Fig. 16 but shows the edge flow element pivoted g to the "opened" disposition thereof ;
  • Fig. 18 is a similar view to that shown in Fig. 17 but shows the edge flow element pivoted to the "closed" disposition thereof;
  • Fig. 19 is a similar view to that shown in Fig. 18 but shows a further variant which includes a trailing element
  • Fig. 20 is a perspective view of yet a further embodiment of the present invention.
  • Fig. 21 is a sectional view of yet another detail of the present invention.
  • Fig. 22 is a view taken on the line 17-17 of Fig. 21;
  • Fig. 23 is a sectional view of another embodiment of the present invention
  • Fig. 24 is a sectional view taken on the line 19-19 of Fig. 23;
  • Fig. 25 is a top plan view of another variant according to the present invention.
  • Fig. 26 is an enlarged view of part of the arrangement shown in Fig. 25.
  • Fig. 1 is a perspective view of a headbox apparatus generally designated 10 according to the preferred embodiment of present invention for a papermaking machine.
  • the headbox apparatus 10 defines a flow path 12 for stock 14 flowing as indicated by the arrow 16 between an upstream location such as a header 18 and a downstream slice lip 20.
  • the apparatus 10 includes a plurality of blocks 22, 23 and 24 which are anchored within the flow path 12 and 16 between the header 18 and the slice lip 20.
  • Each block such as block 22 and an adjacent block 23 of the plurality of blocks 22-24 define therebetween a flow tube generally designated 26 for the flow therethrough of the stock 14.
  • the flow tube 26 has an upstream portion 28 having an upstream and a downstream end 30 and 32 respectively. Additionally, the flow tube 26 has a downstream portion
  • the upstream extremity 36 of the downstream portion 34 extends from the downstream end 32 of the upstream portion 28.
  • the downstream portion 34 of the flow tube 26 has a volume Vl which is greater than a further volume V2 of the upstream portion 28 of the flow tube 26 such that when the stock 14 flows as indicated by the arrow 16 from the upstream portion 28 to the downstream portion 34 of the flow tube 26, the stock 14 is mixed within the downstream portion 34.
  • the plurality of blocks 22-24 are fabricated from high density polypropylene. Also, it will be understood by those skilled in the art that instead of a cross machine direction tapered header 18, multiple flow injection hoses could be used at the upstream location. Also, the headbox could be provided with a stock dilution control for controlling the cross machine direction profile of the resultant web..
  • Fig. 2 is an exploded view of the blocks generally designated 22 and 23 shown in Fig. 1.
  • each block such as block 22 of the plurality of blocks 22-24 has a first and a second end 42 and 44 respectively, the block 22 having a first portion 46 which extends from the first end 42 of the block 22.
  • the block 22 has a second portion 48 which extends from the first portion 46 to the second end 44 of the block 22.
  • the first portion 46 of the block 22 defines a first and a second side 50 and 52 respectively, the first side 50 of the first portion 46 being planar.
  • the second side 52 of the first portion 46 is also planar, the second side 52 being disposed spaced and parallel relative to the first side 50.
  • the second portion 48 of the block 22 defines a first and a second face 54 and 56 respectively, the first face 54 of the second portion 48 defining a surface 58 and a further surface 60.
  • Fig. 3 is a view taken on the line 3-3 of Fig.2.
  • the second face 56 of the second portion 48 defines a facing 62 and a further facing 64.
  • the first face 54 is disposed spaced and parallel relative to the second face 56, with the first face 54 and the second face 56 being spaced apart by a distance Dl which is less than a further distance D2 between the first and second sides 50 and 52 respectively of the first portion 46.
  • the second portion 48 of the block 22 defines a first rib 66 which is disposed between the surface 58 and the further surface 60, the first rib 66 extending between the first portion 46 and the second end 44 of the block 22.
  • the second portion 48 of the block 22 defines a second rib 68 which is disposed between the facing 62 and the further facing 64, the second rib 68 extending between the first portion 46 and the second end 44 of the block 22.
  • the first portion 46 defines a first chamfer 70 which extends between the first side 50 of the first portion 46 and the surface 58.
  • the first portion 46 defines a second chamfer 72 which extends between the second side 52 of the first portion 46 and the further facing 64.
  • the arrangement is such that the flow tube 26 as shown in Fig. 1 is defined between the adjacent blocks 22 and 23 so that when stock 14 flows as indicated by the arrow 16 as shown in Fig. 2 through the upstream portion 28 Of 1 the flow tube 26 into the downstream portion 34 of the flow tube 26, the stock 14 is mixed within the downstream portion 34 the stock 14 being guided between the second rib 68 of the block 22 and the first rib 66 of the adjacent block 23.
  • Fig. 4 is a view taken on the line 4-4 of Fig. 2.
  • the apparatus 10 is structured such that the stock 14 flowing into the downstream portion 34 of the flow tube 26 separates into a first vortex 74.
  • the first vortex 74 is disposed adjacent to the facing 62 of the block 22 and between the facing 62 of the block 22 and the surface 58 of the adjacent block 23.
  • Fig. 5 is a view taken on the line 5-5 of Fig 2.
  • the apparatus 10 is structured such that the stock 14 flowing into the downstream portion 34 of the flow tube 26 separates into a second vortex 76.
  • the second vortex 76 is disposed adjacent to the further facing 64 of the block 22 and between the further facing 64 of the block 22 and the further surface 60 of the adjacent block 23 so that mixing of the stock 14 within the downstream portion 34 of the flow tube 26 is enhanced.
  • the first vortex 74 has a clockwise rotational direction as indicated by the arrow 78 which is opposite to a counter clockwise further rotational direction as shown in Fig. 5 such counter clockwise further rotational direction being indicated by the arrow 80. Accordingly, the counter rotating vortices 74 and 76 as shown in Figs. 4 and 5 respectively further enhance mixing of the stock 14 within the downstream portion 34 of the flow tube 26.
  • the opposite rotational directions as indicated by arrows 78 and 80 respectively of the first and second vortices 74 and 76 is predictably achieved by virtue of the first chamfer 70 of the adjacent block 23 and by the second chamfer 72 of the block 22.
  • the first chamfer 70 of the adjacent block 23 as shown in Fig. 4 guides the flow of stock flowing from the upstream portion 28 of the flow tube 26 to generate the first vortex 74 so that the first vortex 74 rotates within the downstream portion 34 of the flow tube 26 in the rotational direction as indicated by the arrow 78.
  • the further chamfer 72 of the block 22 guides the flow of stock flowing from the upstream portion 28 of the flow tube 26 to generate the second vortex 76 so that the second vortex 76 rotates within the downstream portion 34 of the flow tube 26 in the further rotational direction 80 opposite to the rotational direction 78 so that impact of the first and second vortices 74 and 76 respectively on a flow consistency and a velocity uniformity of the stock 14 is reduced.
  • the stock 14 flows into the flow tube 26 as indicated by the arrow 16.
  • the velocity of the flow of the stock 14 increases during passage thereof through the upstream portion 28 of the flow tube 26. Such increased velocity assists in. maintaining the cleanliness of the flow tube.
  • the downstream portion 34 with volume Vl is a single chamber but is to a degree divided into an upper and a lower chamber by the rib 68 of the block 22 and the rib 66 of the adjacent block 23 as shown in Figs. 4 and 5.
  • the vortex 74 generated within the upper chamber as shown in Fig.4 is caused to flow in a generally clockwise direction 78 because as the stock 14 flows from the upstream portion 28 into the upper chamber of the downstream portion 34, the first chamfer 70 of the adjacent block 23 guides such stock flow in the clockwise direction 78.
  • the vortex 76 generated within the lower chamber as shown in Fig. 5 is caused to flow in a generally counter clockwise direction 80 because as the stock 14 flows from the upstream portion 28 into the lower chamber of the downstream portion 34, the second chamfer 72 of the block 22 guides such stock flow in the counter clockwise direction 80.
  • the opposite rotational directions of the vortices 74 and 76 enhance mixing of the stock 14 within the upper and lower chambers which are interconnected with each other. Therefore, the stock 14 within the downstream portion 34 of the flow tube 26 is thoroughly mixed before discharge thereof through the slice lip 20.
  • blocks 22-24 could be fabricated from stainless steel, ceramic material or any suitable synthetic material.
  • the present invention could include a dilution control mechanism for introducing diluting fluid into one or more flow tubes or upstream relative to the flow tubes for controlling the cross machine basis weight profile of the resultant sheet.
  • Fig. 6 is a top plan view of a headbox apparatus generally designated 10 for a papermaking machine according to another embodiment of the present invention.
  • the headbox apparatus 10 defines a flow path indicated by the arrow 12 for stock flowing between an upstream end or header 14 and a downstream end or slice lip 16.
  • the apparatus 10 includes a plurality of elements 18, 19 and 20 which are anchored within the flow path 12 between the header 14 and the slice lip 16.
  • Each element such as the element 18 and an adjacent element 19 of the plurality of elements 18-20 define therebetween a flow tube generally designated 22 for the flow therethrough, as indicated by the arrow 24, of the stock.
  • the flow tube 22 has an upstream portion 26 and a downstream portion 28 that gradually widens in a direction, as indicated by the arrow 30, from the header 14 to the slice lip 16.
  • each of the elements 18-20 is fabricated from a plastics material. More specifically, the plastics material is a high molecular weight polyethylene.
  • the elements 18-20 are fabricated from graphite composite material, fiberglass material, ceramic material, cermet material or stainless steel. Also, the elements in a further alternative arrangement are fabricated from TEFLON. TEFLON is a Registered Trademark owned by the Du Pont Corporation.
  • the elements 18-20 may be fabricated from any suitable metallic or non metallic material.
  • each element such as element 18 defines an upstream bore 32 and a downstream bore 34.
  • Fig. 7 is an enlarged view similar to that shown in Fig. 6 and shows in more detail the bores 32 and 34. As shown in Fig. 7, a first anchor rod 36 extends through the upstream bore 32. Additionally, a second anchor rod 38 extends through the downstream bore 34 such that the anchor rods 36 and 38 anchor the element 18 within the headbox apparatus 10.
  • each element such as element 18 has a first and a second side 40 and 42 respectively.
  • the first side 40 is of mirror image configuration relative to the second side 42.
  • each element such as element 18 is disposed in alignment in the direction 30 relative to the adjacent element 19.
  • Fig. 8 is a perspective view showing another embodiment of the present invention.
  • an element such as element 20a is disposed, as shown in phantom outline, out of alignment, in the direction 30a relative to an adjacent element 19a such that the element 20a and the adjacent element 19a are offset relative to each other.
  • the element 20a is adjustable as indicated by the arrow 72 so that the element 20a is selectively movable in a direction upstream or downstream relative to the adjacent element 19a
  • Fig. 9 is a sectional view taken on the line 4-4 of Fig. 6. As shown in Fig. 9, the upstream portion 26 is of rectangular cross sectional configuration.
  • Fig. 10 is a sectional view taken on the line 5-5 of Fig. 8. As shown in Fig. 8, the upstream portion 26a is of rectangular cross sectional configuration.
  • the upstream portion 26 has an upstream and a downstream end 44 and 46 respectively.
  • the upstream portion 26 is of uniform cross sectional configuration between the upstream and downstream ends 44 and 46 thereof.
  • downstream portion 28 has an upstream extremity 48 and a downstream extremity 50.
  • Fig. 11 is a sectional view taken on the line 6-6 of Fig. 7. As shown in Fig. 11 , the upstream extremity 48 of the downstream portion 28 has a cross sectional area 52 which is greater than a cross sectional area 54 of the upstream portion 26 as shown in Fig. 9.
  • Fig. 12 is a sectional view taken on the line 7-7 of Fig.7. As shown in Fig. 11, the upstream extremity 48 of the downstream portion 28 has a cross sectional area 52 which is less than a cross sectional area 56 of the downstream extremity 50 as shown in Fig. 12.
  • the cross sectional area 52 to 56 of the downstream portion 28 progressively or uniformly increases in the direction 30 between the upstream and the downstream extremities 48 and 50 respectively of the downstream portion 28.
  • an intermediate portion 80 of the flow tube 22 extends between the upstream portion 26 and the downstream portion 28 of the flow tube 22.
  • the intermediate portion 80 has a first and a second end 82 and 84 respectively.
  • Fig. 13 is a sectional view taken on the line 8-8 of Fig. 7. As shown in Fig. 13, the intermediate portion 80 has a rectangular cross sectional configuration 86 that has a larger cross sectional area than the cross sectional area 54 of the upstream portion 26 shown in Fig. 9.
  • Fig. 14 is a sectional view taken on the line 9-9 of Fig. 7.
  • the intermediate portion 80 has a rectangular cross sectional area 88 that is substantially the same as the cross sectional area 86 shown in Fig. 13.
  • the intermediate portion 80 is of substantially uniform cross sectional configuration from the first end 82 to the second end 84 thereof.
  • Fig. 15 is a top plan view which is similar to that shown in Fig. 7 but shows another embodiment of the present invention. As shown in Fig.
  • the downstream end 46b of the upstream portion 26b defines a chamfered transition 58 which is disposed adjacent to the first end 82b of the intermediate portion 80b such that the stock flows as indicated by the arrow 24b through the upstream portion 26b then through the chamfered transition 58 and then through the intermediate portion 80b to the downstream portion 28b.
  • the headbox apparatus 10 further includes an edge flow element 60 having an upstream and a downstream termination 62 and 64 respectively.
  • the edge flow element 60 is pivotally anchored about a pivotal axis 65 adjacent to the downstream termination 64.
  • Fig. 16 is a top plan view of the edge flow element 60. As shown in Fig. 16, the arrangement is such that selective pivotal movement, as indicated by the arrow 66, of the edge flow element 60 is permitted. The arrangement is such that a cross sectional area of an edge flow tube 70 defined between the edge flow element 60 and an adjacent element 20 of the plurality of elements 18-20 is selectively adjustable.
  • Fig. 17 is a similar view to that shown in Fig. 16 but shows the edge flow element 60 pivoted to the "opened" disposition thereof so that there is a tendency for the stock to flow away from the pondside 67 as indicated by the arrow 69.
  • Fig. 18 is a similar view to that shown in Fig. 17 but shows the edge flow element 60 pivoted to the "closed" disposition thereof so that there is a tendency for stock to flow towards the pondside 67 as indicated by the arrow 69.
  • Fig. 19 is a similar view to that shown in Fig. 18 but shows a further variant.
  • the headbox 10c includes a trailing element 90 having a proximal and a distal end 91 and 92 respectively.
  • the proximal end 91 is pivotally secured adjacent to downstream extremity 50c of the downstream portion 28c.
  • the headbox 10 may include a dilution control 92 for controlling the cross machine consistency profile of the resultant web.
  • Fig. 20 is a perspective view of a further embodiment of the present invention. As shown in Fig. 20, elements 18d, 18d ⁇ 18d" and 18d"' are arranged in vertical columns. Thus, the arrangement of Fig. 20 may be used for generating a multi-ply web.
  • Fig. 21 is a sectional view of yet a further detail of the present invention. As shown in Fig. 21, the rods generally designated 36 and 38 include a compression link 94 and a tension link 96 respectively. Also, an alignment pin 98 is provided.
  • Fig. 22 is a view taken on the line 17- 17 of Fig. 21. As shown in Fig. 22, the element 18 is anchored by rods 36 and 38 and is aligned by the alignment pin 98.
  • Fig. 23 is a sectional view of another embodiment of the present invention.
  • rods 36e and 38e are used to anchor elements such as elements 18e and 18e' together such as in the arrangement shown in Fig.20.
  • Alignment pins 98e and 98e' are used to align elements 18e and l ⁇ e 1 .
  • Fig. 24 is a sectional view taken on the line 19-19 of Fig. 23. As shown in Fig. 24, the element 18e' is anchored by rods 36e and 38e.
  • the stock flows through the flow tubes 22 so that the flow of stock is accelerated during passage thereof through the upstream portion 26 and decelerated during movement through the downstream portion 28 to form a stabilized vortex flow in the downstream portion 28.
  • the edge flow element 60 is adjusted to alter the direction of flow adjacent to the pondside 67 to control the edge formation of the resultant web.
  • the edge element 20a is moved in a machine direction 72 to alter and control the vortex formation within the downstream portion 28a to achieve an optimum mixing of the stock to be ejected through the slice lip.
  • each flow tube can be offset relative to an adjacent flow tube to form a non aligned column of flow tubes.
  • Fig. 25 is a top plan view of a further variant according to the present invention.
  • the headbox apparatus 10 defines a flow path 12 for stock flowing between an upstream end 14 and a downstream end 16 of the apparatus 10.
  • the apparatus 10 includes a plurality of blocks 18, 19 and 20 which are movably anchored within the flow path 12 between the upstream end 14 and the downstream end 16 of the apparatus 10.
  • Each block such as block 18 and an adjacent block 19 of the plurality of blocks 18-20 defines therebetween a flow tube generally designated 22 for the flow 12 therethrough of the stock.
  • the flow tube 22 has an upstream portion generally designated 24 and a downstream portion generally designated 26, the upstream portion 24 defining an inlet 28 having an upstream and a downstream end 30 and 32 respectively.
  • the downstream portion 26 defines a vortex chamber 34 having an upstream and a downstream extremity 36 and 38 respectively.
  • the downstream end 32 of the inlet 28 is disposed adjacent to the upstream extremity 36 of the vortex chamber 34.
  • Fig. 26 is an enlarged view of part of the arrangement shown in Fig.25. As shown, Fig.26. is an en enlarged sectional view of the inlet 28 and part of the vortex chamber 34. As shown in Fig.
  • each block such as block 18 and the adjacent block 19 is selectively movable in an axial direction as indicated by the arrow 40.
  • a ramp 42 is defined by one of each block and adjacent block such as block 19, the ramp 42 being disposed in a vicinity of the downstream end 32 of the inlet 28 for directing the flow 12 as indicated by the arrow 44, towards a block 18 disposed opposite to the block 19 defining the ramp 42 such that a more uniform vortex 46 is generated within the vortex chamber 34.
  • the headbox according to the present invention provides a unique arrangement for enhancing mixing of stock flowing through the flow tubes of a tube bank of a headbox.

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Abstract

La présente invention concerne un appareil de caisse de tête pour une machine à papier. L'appareil de caisse de tête définit une voie d'écoulement pour la pâte de papier. L'appareil comprend des blocs fixés à l'intérieur de la voie d'écoulement. Chaque bloc ainsi qu'un bloc adjacent, définissent entre eux un tube d'écoulement. Ledit tube comprend une partie amont et une partie aval, avec des extrémités amont et aval. La partie aval du tube d'écoulement comporte un volume supérieur à un autre volume de la partie amont du tube d'écoulement de sorte que lorsque la pâte de papier s'écoule vers le bas du tube d'écoulement, la pâte de papier est mélangée à l'intérieur de la partie aval.
PCT/US2007/025905 2006-12-19 2007-12-18 Appareil de caisse de tête pour une machine à papier WO2008082546A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US87583606P 2006-12-19 2006-12-19
US11/642,054 2006-12-19
US60/875,836 2006-12-19
US11/642,054 US7794570B2 (en) 2006-01-30 2006-12-19 Headbox apparatus for a papermaking machine
US89862807P 2007-01-31 2007-01-31
US60/898,628 2007-01-31

Publications (1)

Publication Number Publication Date
WO2008082546A1 true WO2008082546A1 (fr) 2008-07-10

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230149226A1 (en) * 2020-03-31 2023-05-18 Kimberly-Clark Worldwide, Inc. Method and apparatus for producing a zoned and/or layered substrate

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4617091A (en) * 1983-11-25 1986-10-14 Beloit Corporation Headbox trailing element
US6248214B1 (en) * 1998-10-05 2001-06-19 Voith Sulzer Papiertechnik Patent Gmbh Headbox
US6383614B1 (en) * 1999-06-18 2002-05-07 The Procter & Gamble Company Multi-purpose absorbent and cut-resistant sheet materials
US6475344B1 (en) * 1995-10-20 2002-11-05 Institue Of Paper Science And Technology, Inc. Method of mixing jets of paper fiber stock

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4617091A (en) * 1983-11-25 1986-10-14 Beloit Corporation Headbox trailing element
US6475344B1 (en) * 1995-10-20 2002-11-05 Institue Of Paper Science And Technology, Inc. Method of mixing jets of paper fiber stock
US6248214B1 (en) * 1998-10-05 2001-06-19 Voith Sulzer Papiertechnik Patent Gmbh Headbox
US6383614B1 (en) * 1999-06-18 2002-05-07 The Procter & Gamble Company Multi-purpose absorbent and cut-resistant sheet materials

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230149226A1 (en) * 2020-03-31 2023-05-18 Kimberly-Clark Worldwide, Inc. Method and apparatus for producing a zoned and/or layered substrate
US11866884B2 (en) * 2020-03-31 2024-01-09 Kimberly-Clark Worldwide, Inc. Method and apparatus for producing a zoned and/or layered substrate
US20240125048A1 (en) * 2020-03-31 2024-04-18 Kimberly-Clark Worldwide, Inc. Method and apparatus for producing a zoned substrate

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