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WO2005073460A1 - Dispositif de deshydratation pour machine a papier - Google Patents

Dispositif de deshydratation pour machine a papier Download PDF

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Publication number
WO2005073460A1
WO2005073460A1 PCT/FI2005/050014 FI2005050014W WO2005073460A1 WO 2005073460 A1 WO2005073460 A1 WO 2005073460A1 FI 2005050014 W FI2005050014 W FI 2005050014W WO 2005073460 A1 WO2005073460 A1 WO 2005073460A1
Authority
WO
WIPO (PCT)
Prior art keywords
dewatering device
pieces
wire
frame
ceramic
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/FI2005/050014
Other languages
English (en)
Finnish (fi)
Inventor
Antti Poikolainen
Jeffrey C. Irwin
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.)
Valmet Technologies Oy
Original Assignee
Metso Paper Oy
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 Metso Paper Oy filed Critical Metso Paper Oy
Publication of WO2005073460A1 publication Critical patent/WO2005073460A1/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
    • D21F1/483—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
    • 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

  • the invention relates to a dewatering device for a paper machine.
  • the cross-section of the pieces is advantageously, for example, a circular cross-section, and the pieces are attached to their base such that the free space remaining between them forms a certain hole pattern.
  • the so-called "hole pattern” By selecting the grouping of the pieces and the free spaces between them, i.e. the so-called "hole pattern", in a suitable manner, the marking of the web is prevented and, hence, said selections have an important role in the manufacture of paper.
  • Small button-like, preferably ceramic pieces are attached, in one embodiment of the invention, detachably to their base, for example, with screw means, and they can be placed in a precise position such that the outer surfaces of the pieces allow a desired web run to be formed as a straight run or with a certain radius of curvature M.
  • dewatering passages for example, grooves have been formed by working a ceramic structure and by removing material.
  • this is not done, but pieces manufactured to be of a certain size are assembled into groups on the frame of the dewatering device using attachment means, and by means of them a dewatering pattern of a desired size and shape is formed.
  • the so-called free space remaining between the pieces can be made as desired in shape and in size by attaching the pieces to form a group of a certain configuration with respect to their base and one another.
  • the first chamber of the blade shoe be replaced with a straight or a slightly curved dewatering zone in which the carrier surfaces in contact with a wire are constituted by small separate pieces.
  • the pieces are ceramic pieces. Said ceramic pieces are placed such that they form a certain pattern that corresponds, for example, to a drilling pattern of a prior-art forming roll.
  • on both sides of the dewatering zone there is the same pattern formed by pieces, however, such that there is a phase shift between the patterns formed by the different sides. Because of the phase shift, in said dewatering zone, a situation cannot arise where opposing pieces are placed against each other.
  • An open volume is formed in the gaps formed between said pieces, preferably ceramic pieces, along which volume the water being drained is conducted away and, when needed, fine-tuning of the two-sidedness of the web is carried out by adjusting the dewatering process by means of suction.
  • the carrier surface of the dewatering area is formed such that the wires can be kept in shape with a sufficient number of pieces and with wire tension.
  • the equipment is particularly suitable as a dewatering unit in connection with a former, so that the pieces define a surface against which a wire H l5 H is placed, stock W passing between the wires Hj and H and water being removed on two sides by means of a first dewatering unit of a dewatering box and, in one embodiment, by means of a second dewatering unit situated on the opposite side of the wire run.
  • the pieces are arranged in such a pattern configuration that a desired free space A is provided between the pieces 15a l3 15a ..., so that in the arrangement in accordance with the invention, in each suction zone, the ratio of the total area A 2 of the free space to the area ⁇ Ai of the total surface defined by the pieces is selected as follows.
  • the area A 2 of the free space is larger than the area ⁇ Ai of the total support surface of the pieces in contact with the wire.
  • the total area A of the free space remaining between the pieces 15a l5 15a 2 ... in the device is in a range of from 50 % to 90 % of the sum of the area ⁇ Ai of the total support surface of the pieces 15a 1; 15a 2 ... and the total area A of the free space.
  • the pieces are arranged into a suitable pattern, thereby avoiding the marking of the web, and the pattern may correspond, for example, to hole patterns of a forming roll.
  • Each piece is attached to a frame R, for example, with a screw or with another attachment means in a detachable manner.
  • a frame R that is flexible and formed, for instance, such that the frame R is attached, as flexible, to a deformable hose, so that the hose forms a flexible support surface for the web run Hi, W, H 2 .
  • the pieces are attached detachably with one central attachment means, preferably with a screw, to their base, such as a rail or a frame plate.
  • a central attachment means preferably with a screw
  • the pieces are shaped so as to comprise a mating attachment shape; a profile shape to be placed in a mating attachment means of a rail, preferably in a groove.
  • the number of pieces is in a range of from 100 pieces / m 2 to 500 pieces / m 2 .
  • the pieces can be attached either to a rail (as shown in Fig. 5) or they can be attached to a base plate, a so-called frame plate, which is advantageously provided with elongated openings through which a vacuum is applied to a space between the frame plate and the wire run Hi or H 2 . Desired dewatering is achieved by adjusting the length and the position of the openings, which also has the effect that there will be no marking in the web.
  • the dewatering device for a paper machine or equivalent according to the invention is characterized by what is stated in the claims.
  • Figure 1 A is a side view of a piece according to the invention attached to a base.
  • Figure IB is an illustrative and axonometric view of a structure according to the invention.
  • Figure 2A shows how pieces according to the invention are applied in a gap former arrangement, so that they form the surface of a dewatering unit against which a wire Hi, H 2 is placed.
  • Figure 2B is a cross-sectional view of the arrangement of Figure 2A in a machine direction and in more detail.
  • Figure 2C shows another advantageous embodiment of the dewatering device according to the invention.
  • the equipment is in connection with a headbox and the illustration is a side view.
  • Figure 2D shows the area Xi in Figure 2C
  • Figure 2E shows the device arrangement of Figure 2D viewed in the direction of the arrow Ki, and the web run Hi, W, H 2 is not depicted to show structures.
  • Figure 3 A illustrates the attachment of pieces to a frame plate comprising elongated openings for applying suction to a space between a wire and the frame plate as desired.
  • Figure 3B is an illustrative axonometric and partial view of the structure shown in Figure 3A.
  • Figure 4A shows another embodiment in which a frame plate is provided with elongated openings obliquely with respect to the running direction of the web.
  • Figure 4B is an axonometric and illustrative partial view of the structure of Figure
  • Figure 5 shows the attachment of pieces to a loading hose, to a flexible frame part on the loading hose.
  • Figure 6A shows another advantageous structure of the piece.
  • Figure 6B shows pieces of Fig. 6A attached to attachment frames R, R 2 , R 3 ..., which in the embodiment of the figure are elongated, rib-like rail structures, the ceramic pieces 15a 1? 15a 2 ... being placed in grooves T in the rail structures, so that a respective mating piece joint formed in the ceramic piece will be situated in a mating attachment means provided in the attachment frame.
  • the attachment can be, for example, a dovetail attachment.
  • Figure 6C is a partial sectional view of the position of a ceramic piece in a frame Ri, which is a rail-shaped and rib-like elongated structure comprising a groove T.
  • Figure 7 shows a curved frame R ⁇ to which pieces 15ai, 15a are attached.
  • Figure 7 shows the curvature of the frame R ls whereby the support surface of the ceramic pieces can also be made curved, and a certain tension is imparted to the wire Hi, H 2 , which further affects the removal of water from a pulp web W.
  • Fig. 1A illustrates an arrangement in accordance with the invention, in which there is a dewatering device 13 removing water from stock W in a wire section of a paper machine.
  • the dewatering device 13 comprises separate pieces 15a ⁇ , 15a ... that support a wire Hi.
  • the pieces 15a ⁇ , 15a 2 ... are arranged to be attached with screw means 16 to a frame R such that a free space A 2 remains between the pieces 15a ⁇ , 15a 2 ...
  • the dewatering device 13 comprises pieces 15a l5 15a ... attached to the frame R; Ri, R 2 ... and grouped to define a backing surface to be placed against the wire Hi, H 2 such that a free space A remains around each ceramic piece 15a ⁇ , 15a 2 ...
  • the pieces 15a 1; 15a 2 ... are advantageously ceramic pieces.
  • the ratio of the total area A 2 of the free space to the total area ⁇ Ai of the support surface of the pieces, A 2 : ⁇ Ai, is selected as follows.
  • the area A 2 of the free space is larger than the area ⁇ Ai of the total support surface of the pieces in contact with the wire.
  • the total area A 2 of the free space remaining between the pieces 15a ⁇ , 15a 2 ... in the device is in a range of from 50 % to 90 % of the sum of the area ⁇ Ai of the total support surface of the pieces 15a ⁇ , 15a 2 ... and the total area A 2 of the free space.
  • ⁇ Ai is then the sum of the areas of support surfaces J of the separate pieces 15a ⁇ , 15a 2 ... in contact with the wire.
  • the total area A 2 of the free space is that area amount of the wire which is in contact with the piece and which is limited merely to a free space D between the pieces 15a ⁇ , 15a ...
  • a 2 is substantially larger than ⁇ Ai or, at one edge of the area, at most equally large as ⁇ Ai.
  • the removal of water from the web W is designated with the arrows Li.
  • the paper pulp or stock W travels between the wires Hi and H 2 .
  • the free space A 2 surrounds each piece 15a ⁇ , 15a 2 ... on all sides thereof.
  • the running direction of the web run Hi, W, H 2 is designated by Si.
  • the pieces 15a ⁇ , 15a 2 ... preferably ceramic pieces, are attached with one central attachment means, preferably with a screw 16, in a detachable manner to their base, such as a rail or a frame plate.
  • the ceramic pieces are shaped so as to comprise a mating attachment shape; a profile shape to be placed in a mating attachment means of a rail, preferably in a groove.
  • the number of pieces 15a ⁇ , 15a 2 ... is advantageously in a range of from 100 pieces / m 2 to 500 pieces / m 2 , i.e. in a range of from 100 to 500 pieces / m 2 .
  • Fig. IB is an illustrative and axonometric view of a structure according to the invention, with the web run Hi, W, H not shown.
  • Each piece 15a ⁇ , 15a 2 ..., preferably ceramic piece, is attached with screws 16 to a frame beam Ri, R 2 ...
  • a vacuum is applied to a space D between the pieces 15a ⁇ , 15a ... and further to the forming wire Hi and further to the pulp web W which is dewatered.
  • a wear- resistant tip advantageously comprises a wear- resistant tip ; a front edge 15b, which prevents wear of the piece 15a ⁇ , 15a 2 ...
  • the tip 15b can be made of a different material from that of the rest of the piece 15a ⁇ , 15a 2 ...
  • the surface J of each piece 15a ⁇ , 15a 2 ..., being the top surface of the piece, is in contact with the wire.
  • FIG. 2A shows an advantageous site of application of the invention.
  • a dewatering device 13 comprising pieces 15a ⁇ , 15a 2 ... and dewatering units 13a ⁇ , 13a 2 situated on both sides of the wire and web run Hi, W, H 2 , is disposed after breast rolls 10a ⁇ and 1 lai of a former 200.
  • a stock jet W is introduced from a headbox 100 into a narrowing gap K between the wires Hi and H 2 and further into the dewatering device 13 in accordance with the invention, to a space between the wires Hi and H 2 between the dewatering units 13a ⁇ and 13a 2 of the dewatering device 13.
  • the former 200 as shown in Fig.
  • the wire Hi is passed over rolls 10a ⁇ , 10a 2 , 10a 3 , 10a and 10a 5 and, similarly, the wire H is passed over rolls 1 lai, 1 la , 1 la 3 , 1 la 4 and l la 5 .
  • the web W is passed by means of the suction of the suction roll 10a 2 into connection with the wire Hi only and, in connection with the wire Hi, onto a pick-up roll 12, whose vacuum is used for passing the web run W further to a press section 300.
  • Fig. 2B is a cross-sectional and illustrative view of the structure shown in Fig. 2A.
  • the breast rolls 10a ⁇ and llai bend the wires Hi and H 2 into the narrowing gap K, into which the stock W is introduced as a jet from the headbox 100 and further into the dewatering device 13 in accordance with the invention, which dewatering device comprises the dewatering units 13a ⁇ , 13a 2 ..., preferably suction boxes, on both sides of the wire-stock-wire run Hi, W, H 2 .
  • dewatering device comprises the dewatering units 13a ⁇ , 13a 2 ..., preferably suction boxes, on both sides of the wire-stock-wire run Hi, W, H 2 .
  • the vacuum in the space D in the suction box 13a ⁇ , 13a 2 is produced through a dewatering and suction duct 14 such that the vacuum is applied to the space D between the pieces 15a ⁇ and 15a 2 and their attachment frames Ri, R ...
  • the removal of water from the pulp web W thus takes place on two sides, and by using pieces 15a ⁇ , 15a 2 ... in accordance with the invention, the free flow area A 2 between the pieces 15a ⁇ , 15a 2 ... can be maximized to maximize dewatering.
  • the frames Ri, R 2 ... can be curved, thus imparting curvature to the web run Hi, W, H 2 .
  • Suction can be provided in both suction boxes or only in one suction box or in neither suction box.
  • Dewatering can be accomplished by means of the curvature of the web run Hi, W, H and, thus, by means of the tension of the wire Hi, H 2 and/or making use of the centrifugal force acting on the curved web run Hi, W, H 2 .
  • Figs. 2C, 2D and 2E show an embodiment of the invention in which stock W is passed from a headbox 100 into a narrowing gap K between wires Hi and H passed via breast rolls 10a ⁇ and 1 lai. Further, after the gap K there is a dewatering device 13, which, in accordance with the invention, comprises a frame R which is formed of a plate and to which pieces 15a ⁇ , 15a 2 , 15a 3 ... are attached, for example, by gluing or detachably with screws 16.
  • Fig. 2D shows the dewatering device 13 in more detail from the area Xi in Fig. 2C.
  • Fig. 2E shows the structure as viewed in the direction of the arrow K in Fig. 2C.
  • the plate R is thus provided with openings or holes Ui, U 2 ..., through which a vacuum is applied to a free space D formed between the wire Hi and the plate R.
  • the cross-section of the holes/openings Ui, U 2 ... is advantageously a circular cross-section.
  • the frame R has a radius of curvature M.
  • the pulp web W in two directions, into the space D due to the effect of the vacuum produced in the space D and, because of the centrifugal force, in the other direction, in which direction water is removed from the pulp web W through the wire H 2 .
  • a suction duct 14 which is further connected to a pump (not shown), so that the pump is used for applying suction through the holes/openings Ui, U 2 ... of the plate R to the space D and further, through the wire H 2 , to the stock W.
  • the suction duct 14 is connected to an inlet chamber G, which becomes narrower towards its end, i.e.
  • the entire structure i.e. the plate frame R and the walls of the chamber G as well as the suction duct 14 can be advantageously made of stainless steel.
  • the pieces 15a ⁇ , 15a 2 can be attached with screws to threaded holes of the frame R or the piece 15a ⁇ , 15a ... can comprise an attachment arm ti, which is glued into a hole f of the frame R.
  • Figs. 3A and 3B show one advantageous embodiment of the invention in which pieces 15a l5 15a 2 ... are advantageously attached with screw means 16 to a plate- like frame R. It is provided with elongated openings Ui, U 2 ..., the longitudinal axes X of which extend in the embodiment perpendicularly to the running direction Si of the web and through which openings a vacuum is applied to a space D between the wire Hi and the frame R.
  • the openings Ui, U 2 ... in a desired manner between the pieces 15a ⁇ , 15a 2 ..., sufficient space is also obtained for the wire water removed from the pulp web W.
  • Figs. 4A and 4B show an embodiment corresponding to that of Figs. 3A and 3B except that in the embodiment the longitudinal axes X of the openings Ui, U 2 ... are arranged obliquely with respect to the running direction Si of the web.
  • the marking of the web can also be avoided by directing the opening Ui, U 2 ... and, in the embodiment comprising an upper suction box 13a ⁇ and a lower suction box 13a , by placing the pieces in staggered relationship with respect to the upper suction box 13a ⁇ and the lower suction box 13a 2 .
  • the pieces 15a ⁇ , 15a 2 ... of the upper suction box 13a ⁇ and the lower suction box 13a 2 are not in opposed relationship.
  • Fig. 5 shows an embodiment of the invention in which a frame R u comprises in its connection a pneumatic hose 40 that forms a flexible base for pieces 15a ⁇ , 15a 2 ...
  • the rib-like frame R u to which the pieces 15a ⁇ , 15a 2 ... are attached by means of screws 16, is also a flexible structure, which is, for instance, glued to the surface of the hose 40.
  • the pieces 15a ⁇ , 15a 2 ... are attached with attachment means 16, preferably with screws, to the frame R, i.e. to their base.
  • a desired piece pattern can thus be selected for different papermaking runs and the desired pieces can be attached to the frame R.
  • a piece 15a ⁇ , 15a 2 ... is damaged, its replacement is also simple because a new piece 15a ⁇ , 15a ... can be attached in place of a damaged one with an attachment means, such as a screw 16.
  • Figs. 6A and 6B show an advantageous embodiment of the invention in which pieces 15a ⁇ , 15a 2 are attached to a frame R formed of rails Ri, R 2 ...
  • Fig. 6A is a side view of a ceramic piece 15a ! .
  • Fig. 6B shows ceramic pieces 15a 1: 15a 2 ... according to Fig. 6A as attached to the frames Ri, R 2 , which are rails.
  • Each ceramic piece 15a ⁇ , 15a 2 ... is passed, as shown in Fig. 6B, to its rail Ri and placed at a certain distance with respect to one another and attached to the rail with an attachment means, such as a screw 16.
  • the rail Ri, R 2 ... comprises a groove 160 in which a mating attachment means i.e. an attachment profile 161 of the piece 15a ⁇ is placed.
  • the screw 16 serving as the attachment means proper is passed through the piece 15a ⁇ , 15a 2 ... such that each piece 15a ⁇ , 15a 2 ... can be attached to a desired point in the rail Ri, R 2 ...
  • a surface J of the piece 15a ⁇ , 15a 2 ... in contact with and against the wire is curved in the embodiment of the figure and corresponds, for instance, to the curvature of the web run Hi, W, H 2 .
  • the surface J may also be a straight surface.
  • the piece 15a ⁇ , 15a 2 ... comprises a curved front edge 150 which is placed against the running direction Si of the web and by means of which the water being removed from the stock and further from the wire Hi, H 2 is guided.
  • Fig. 6C illustrates the position of the piece 15a ⁇ in a guide-shaped frame Ri, the upper edges of a groove T of the frame Ri being shaped into attachment means 160 into which a dovetail edge i.e. the mating attachment means 161 of the piece 15a ⁇ is positioned.
  • the pieces 15a ⁇ , 15a 2 ... can be placed into the guide- shaped frames Ri from the end of the frames and, as shown in the figure, they can be attached to a desired position with the attachment means 16, preferably with a screw, which is passed, for instance, into a hole ei which is situated in the bottom P of the frame Ri and which comprises an edge into which the screw thread of the screw 16 is positioned.
  • the centre axis of symmetry is designated by the reference letter Y.
  • Fig. 6C is a partial sectional view.
  • Fig. 7 shows a curved frame Ri with pieces 15a ⁇ , 15a 2 ... placed on it.
  • the frame comprises a guide to which the pieces are passed and attached in a desired position with an attachment means 16.
  • the surface defined by the pieces 15a ⁇ , 15a 2 ... can also be made curved in a desired manner.
  • the frame Ri comprises a curvature M, so that the joint support surface defined by the pieces 15a ⁇ , 15a 2 ... for the web run Hi, W, H 2 will also comprise said curvature M.
  • a paper machine or equivalent is also meant board, soft tissue and pulp drying machines.

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  • Paper (AREA)

Abstract

L'invention concerne un dispositif de déshydratation (13) d'une section de table plate d'une machine à papier ou similaire. Ce dispositif de déshydratation (13) comprend des pièces (15a1, 15a2...) fixées à un cadre (R1, R2 ) et groupées afin de former une surface de soutien devant être placée contre une table plate (H1, H2) de façon qu'un espace libre (A2) soit maintenu autour de chaque pièce de céramique (15a1, 15a2 ).
PCT/FI2005/050014 2004-01-30 2005-01-27 Dispositif de deshydratation pour machine a papier Ceased WO2005073460A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20040132 2004-01-30
FI20040132A FI20040132L (fi) 2004-01-30 2004-01-30 Vedenpoistolaite paperikoneessa

Publications (1)

Publication Number Publication Date
WO2005073460A1 true WO2005073460A1 (fr) 2005-08-11

Family

ID=30129458

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2005/050014 Ceased WO2005073460A1 (fr) 2004-01-30 2005-01-27 Dispositif de deshydratation pour machine a papier

Country Status (2)

Country Link
FI (1) FI20040132L (fr)
WO (1) WO2005073460A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE690425C (de) * 1937-02-19 1940-04-25 Rohrbacher Lederfabrik Jos Poe Saugkasten, insbesondere fuer Papiermaschinen
GB1232681A (fr) * 1967-04-17 1971-05-19
AT389534B (de) * 1987-06-04 1989-12-27 Albert Hans Vorrichtung zur entwaesserung einer auf einem sieb transportierten stoffbahn
WO2002070818A1 (fr) * 2001-02-27 2002-09-12 Voith Paper Patent Gmbh Procede et dispositif servant a produire des courants transversaux dans un systeme de fabrication de feuilles

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE690425C (de) * 1937-02-19 1940-04-25 Rohrbacher Lederfabrik Jos Poe Saugkasten, insbesondere fuer Papiermaschinen
GB1232681A (fr) * 1967-04-17 1971-05-19
AT389534B (de) * 1987-06-04 1989-12-27 Albert Hans Vorrichtung zur entwaesserung einer auf einem sieb transportierten stoffbahn
WO2002070818A1 (fr) * 2001-02-27 2002-09-12 Voith Paper Patent Gmbh Procede et dispositif servant a produire des courants transversaux dans un systeme de fabrication de feuilles

Also Published As

Publication number Publication date
FI20040132A7 (fi) 2005-07-31
FI20040132A0 (fi) 2004-01-30
FI20040132L (fi) 2005-07-31

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