EP0627524A1 - Blattbildungspartie in einer Papiermaschine - Google Patents

Blattbildungspartie in einer Papiermaschine Download PDF

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Publication number
EP0627524A1
EP0627524A1 EP94850086A EP94850086A EP0627524A1 EP 0627524 A1 EP0627524 A1 EP 0627524A1 EP 94850086 A EP94850086 A EP 94850086A EP 94850086 A EP94850086 A EP 94850086A EP 0627524 A1 EP0627524 A1 EP 0627524A1
Authority
EP
European Patent Office
Prior art keywords
wire
dewatering
twin
zone
rib
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.)
Granted
Application number
EP94850086A
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English (en)
French (fr)
Other versions
EP0627524B1 (de
Inventor
Jyrki Jaakkola
Seppo Kiviranta
Ari Linsuri
Michael Odell
Antti Poikolainen
Samppa Salminen
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 Oy
Original Assignee
Valmet Paper Machinery Inc
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Filing date
Publication date
Application filed by Valmet Paper Machinery Inc filed Critical Valmet Paper Machinery Inc
Publication of EP0627524A1 publication Critical patent/EP0627524A1/de
Application granted granted Critical
Publication of EP0627524B1 publication Critical patent/EP0627524B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D21F1/48—Suction apparatus

Definitions

  • a web former of a paper machine is described, in particular for modernizations of Fourdrinier wire parts.
  • This former comprises a lower-wire loop placed in connection with the headbox of the paper machine and forming a single-wire, usually horizontal initial portion of the dewatering zone, in which zone water is drained by means of dewatering members out of the web that is being formed through the lower wire.
  • the web former comprises an upper-wire unit, in which there is an upper wire guided by guide and web-forming rolls, which upper wire, together with the run of the lower wire, forms a twin-wire dewatering zone, which starts at the first forming roll, which is placed inside the loop of the upper wire and is provided with an open hollow face.
  • a forming shoe which has a curved deck that guides the lower-wire loop and whose curve centres or centre are/is placed at the side of the lower-wire loop.
  • a forming roll which guides the twin-wire forming zone and on whose guide sector the run of the twin-wire forming zone is curved downwards.
  • the dewatering takes place primarily upwards through the upper wire, after which the dewatering pressure is increased further in the area of the second forming roll, while the dewatering still takes place primarily through the upper wire.
  • the object of the present invention is further development of the applications of the prior-art MB units as well as to provide novel advantageous combinations of said MB units and especially of hybrid formers.
  • twin-wire former in particular a combination of a hybrid former and a MB former, by whose means it is possible to achieve good base formation and formation of the web while maintaining a satisfactory retention level also at increased web speeds.
  • the invention is mainly characterized in that, after said first forming shoe, a pressure-loaded dewatering unit is fitted, which is provided with opposite sets of ribs and with dewatering chambers, that the first dewatering chamber in said dewatering unit is placed above said first forming shoe so as, through its suction-deflector duct, to remove substantially water that drains from the area of the curved ribbed deck of the first forming shoe, that said first dewatering chamber is followed by a second dewatering chamber, whose lower part is connected with a, preferably fixed, set of dewatering and guide ribs, into whose gap spaces the drain duct of the second dewatering chamber is opened, and that, against said set of dewatering and guide ribs, a set of ribs operates, which is placed inside the opposite wire loop and which is preferably a set of loading ribs that operates by means of the medium pressure of the loading hoses.
  • the dewatering capacity can be increased and, which is also important, the formation of the web can be improved while the retention remains at a satisfactory level.
  • the MB zone is preceded by a dewatering chamber fitted above the first forming shoe, and said chamber is directly followed by a second dewatering chamber fitted above the MB zone.
  • the waters are removed through drain ducts, which are preferably placed at the driving side of the machine only.
  • said dewatering chambers are placed in the space between the first guide roll, placed inside the loop of the upper wire, and the first forming roll.
  • the twin-wire zone is curved after the MB zone upwards, whereupon there are preferably dewatering members in accordance with the "Sym-Former" concept, such as a second forming shoe and a second forming roll placed inside the loop of the lower wire.
  • the dry solids content of the web is preferably in the range of k1 ⁇ 1.0...3 %, preferably in the range of k1 ⁇ 1.2...1.8 %, in which case the loading ribs in the MB zone produce an efficient dewatering that improves the formation and that takes place both through the upper wire and through the lower wire.
  • symmetric dewatering is also accomplished so that the structure of the web in the z-direction can also be made sufficiently symmetric in respect of the distribution of fillers and fines.
  • Figure 1 is a schematic side view of a hybrid-MB former combination in accordance with the present invention.
  • Figure 2 is a schematic vertical sectional view in the machine direction of the initial part of the twin-wire zone in a hybrid former in accordance with the invention.
  • Figure 4 is a vertical sectional view in the machine direction and on an enlarged scale of the detail DET. encircled by the dashed-dotted line in Fig. 3.
  • the former includes an upper-wire unit 60, which includes the frame part 61.
  • the twin-wire forming zone starts at the first forming shoe 22 and ends at the guide roll 11c of the upper wire 10, after which the web W follows the lower wire 20.
  • the run of the upper wire is guided outside the twin-wire zone by the first guide roll 11a and by the latter guide roll 11c as well as by the upper guide rolls 11d.
  • the guide roll 11a of the upper wire 10 guides the upper wire onto the web W in the area of the ribbed deck 22a of the first forming shoe 22, preferably approximately at its fourth rib when the ribbed deck 22a comprises about 7 ribs.
  • the ribbed deck 22a of the forming shoe 22, which is placed inside the loop of the lower wire 20, has a relatively large curve radius R1, which is, as a rule, dimensioned in the range of R1 ⁇ 3...12 m, preferably in the range of R1 ⁇ 5...8 m.
  • the dry solids content k1 of the web W is, at the beginning of the twin-wire zone, of an order of k1 ⁇ 1.0...3 %, preferably in the range of k1 ⁇ 1.2...1.8 %.
  • the first forming shoe 22 is followed by a MB unit 100 fitted in accordance with the invention.
  • the MB unit 100 comprises a first dewatering chamber 12 fitted inside the loop of the upper wire 10 and, immediately after said chamber, a second dewatering chamber 13. Said chambers 12 and 13 communicate with a source 50 of negative pressure so that the negative pressures p1 and p2 present inside the chambers 12 and 13 can be set or adjusted individually.
  • the first chamber 12 is provided with a water drain duct 12b, which is preferably placed at the driving side of the machine only.
  • the second dewatering chamber 13 is provided with a corresponding water drain duct 13b.
  • the first chamber 12 is attached to the frame parts 61 of the upper-wire unit 60 by means of support members 12a, and similarly the second chamber 13 is attached to the frame parts 61 of the upper-wire unit 60 by means of its support members 13a, if necessary, so that its position can be set or adjusted.
  • a more detailed exemplifying embodiment of the twin-wire zone of the MB unit 100, which comes out from Figs. 3 and 4, will be described in more detail later.
  • the MB unit 100 which has been fitted in accordance with the invention, is followed by a "Sym-Former" twin-wire zone similar to what is known from the prior art.
  • the twin-wire zone is guided by the smooth-faced 14' forming roll 14, on whose sector a the twin-wire zone is curved upwards.
  • the magnitude of the sector a is, as a rule, chosen as a ⁇ 20°...45°.
  • a second forming shoe 24 follows, which has a ribbed deck 24a, which may communicate with negative pressure if necessary.
  • the curve radius R2 of the ribbed deck 24a of the forming shoe 24 is, as a rule, chosen in the range of R2 ⁇ 2...6 m.
  • the second forming shoe 24 is followed by a forming roll 25 placed inside the loop of the lower wire 20, the twin-wire zone being curved downwards on the sector b ⁇ 30°...50° of said forming roll 25.
  • the forming roll 25 is preferably smooth-faced 25' and has no suction zone.
  • the twin-wire zone runs as downwards inclined onto the guide or forming roll 11b placed inside the loop of the upper wire 10, which roll returns the twin-wire zone to the plane T-T determined by the single-wire initial portion 21 or to the proximity of said plane.
  • a pick-up device in itself known follows, which comprises a pick-up fabric 52 and a pick-up roll 51 provided with a suction zone 51a, on which roll the web W is separated from the lower wire 20 and is transferred into the press section of the paper machine (not shown).
  • the twin-wire MB zone starts after the last forming rib 22a0 of the first forming shoe 22, being guided by the first pair of ribs 31a of the loading unit 23.
  • the twin-wire zone After the latter rib in said pair of ribs 31a, in the twin-wire zone, there follows the first fixed dewatering and guide rib 41a, which operates against the inner face of the upper-wire loop 10.
  • the first rib 41a is followed by equivalent dewatering and guide ribs 41 as uniformly spaced.
  • the last one of said ribs is denoted with the reference 41b.
  • pairs of loading ribs 31b and 31c operate, which are placed facing the gap spaces 41R between said dewatering and loading ribs and which are placed inside the lower-wire loop 20.
  • the width a1 of the front face of the dewatering and guide ribs 41 in the machine direction is preferably measured in the range of a1 ⁇ 50...60 mm
  • the width b1 of the gap space between the ribs 31 and 41 in the machine direction, which space has no rubbing face is preferably dimensioned in the range of b1 ⁇ 10...15 mm.
  • Said pairs of ribs 31b,31c as well as the first pair of loading ribs 31a that precedes them are connected in pairs, by means of connecting parts 35, to W-section loading members 34, in whose interior pairs of loading hoses 33 operate.
  • the pressure is regulated with which the pairs of loading ribs 31a,31b,31c are pressed against the inner face of the lower-wire loop 20.
  • the back-up supports for this loading consist of the dewatering and guide ribs 41a,41,41b, which are fixed.
  • the compression pressure between the wires 10,20 is regulated which removes water out of the web W and which is, in the MB zone, applied to the web W placed between the wires 10,20.
  • the loading pressures p k between the different pairs of ribs 31a,31b,31c can be regulated separately in order to "profile" the loading in the running direction of the wires 10,20.
  • the dewatering pressure can also be profiled in the transverse direction by arranging the loading hoses 33 so that they can be loaded with different pressures in the transverse direction by means of blocks.
  • the box of the loading unit 23 may communicate with negative pressure, which is illustrated by the arrow p3, said negative pressure having a dewatering effect through the lower wire 20 through the gap spaces 31R between the loading ribs 31.
  • the lower wall 12c of the first dewatering chamber 12 defines a gap space 12b above the ribbed deck 22a of the first forming shoe 22 and above the first pair of loading ribs 31a.
  • This gap space 12b water is drained that is derived mainly from the area of the ribbed deck 22a of the first forming shoe 22 as well as water that has been "doctored” by the first fixed dewatering and guide rib 41a from the inner face of the upper wire 10.
  • These waters are passed into the first dewatering box 12 in the direction of the arrow F1 through the drain duct 16.
  • Said duct 16 is placed in the space between the rear wall 12c of the first chamber 12 and the vertical wall 13c of the second chamber 13.
  • the duct 16 forms a vertical suction-deflector duct, through which the water is removed in the direction of the arrow F1 into the first chamber 12, being aided by the negative pressure p1 present in said chamber. Out of the first chamber 12, the water is drained through its drain duct 12b, which is preferably placed at the driving side of the machine only.
  • Water is drained in the direction of the arrow F2 through the gap spaces 41R between the ribs 41 along the duct 19 into the second chamber 13, being aided by the negative pressure p2 present in said chamber.
  • the water is drained further out of the chamber 13 through its drain duct 13b, which is preferably placed at the driving side of the machine only.
  • a fixed pair of loading ribs 31d is placed in the loading unit 23, after said loading ribs 31c.
  • the twin-wire zone runs along a gently meandering path when loaded by the loading ribs 31 against the fixed ribs 41.
  • the ribs 31 and 41 which operate alternatingly against one another, apply dewatering impulses to the web W, which impulses improve the formation and produce dewatering, to some extent through the lower wire 20 and especially through the upper wire 10, if necessary, aided by negative pressures p1,p2,p3.
  • the ribs 31a,31b,31c,31d,41,41a,41b have been made as replaceable ribs that extend across the entire width of the wires 10,20, which ribs are either of a wear-resistant material, for example of a ceramic, throughout, or which ribs are provided with a wear-resistant front face, which operates against the inner faces of the wires 10,20, while the water drained out of the web W acts as a lubricant that reduces the wear and the friction.
  • the same also applies in respect of the ribs 22a and 24a in the decks of the forming shoes 22 and 24.
  • a preferred exemplifying embodiment will be described of the lower part of the drain duct 16 of the first dewatering chamber 12.
  • the dimensions and the shape of the throat K of the drain duct 16 of the chamber 12, placed at and above the first rib 41a, are highly critical depending on the amounts of water to be drained, on the speed of the machine, and on the paper grade produced.
  • attempts have been made to regulate the width of said throat K by adjusting the position of the first dewatering chamber 12 by means of various lifting mechanisms, but these devices are expensive, complicated, and they have not been able to provide a solution satisfactory under all circumstances, in particular not in respect of the shape of the throat K. According to Fig.
  • a replaceable form rib 17a which is preferably made of plastic.
  • Said rib 17a is fixed to a fastening base 12e provided in connection with the plane lower wall 12d of the first box 12 by means of the dovetail groove 17b in the rib 17a.
  • Said ribs 17a are made and kept in reserve as of different measures and different profile 17c of the outer face, so that, by replacing the ribs 17a, it is possible to set the width and the profile of the throat K in the draining direction F1 and, if necessary, also in the transverse direction optimally.
  • the construction can be made operative with different machine speeds, both in slower machines, in which the water follows the face of the upper wire 10, and in machines of higher speeds, in which the water moving in the space 12b rises apart from the inner face of the upper wire 10.
  • the invention has been described with express reference to a construction of combination of a hybrid former and a MB former, which is also the most popular and the preferable application of the invention, in which the advantages of the invention are manifested with particular emphasis.
  • the invention can also be applied in so-called gap formers, in which there is no single-wire initial portion 20a, but in which the pulp jet J is fed directly into the gap between the wires 10,20.
  • the dewatering and the dry solids content k1 corresponding to the single-wire portion 20a are preferably accomplished on the forming roll, which operates at the same time as a breast roll, over which the twin-wire zone is curved on a certain sector, on which water is drained primarily through the outer wire, which wire then corresponds to the lower wire 20 in Figs. 1 to 4.
  • the forming roll which operates at the same time as a breast roll, over which the twin-wire zone is curved on a certain sector, on which water is drained primarily through the outer wire, which wire then corresponds to the lower wire 20 in Figs. 1 to 4.

Landscapes

  • Paper (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Making Paper Articles (AREA)
  • Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
EP94850086A 1993-05-18 1994-05-17 Blattbildungspartie in einer Papiermaschine Expired - Lifetime EP0627524B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI932265 1993-05-18
FI932265A FI99033C (fi) 1993-05-18 1993-05-18 Paperikoneen rainanmuodostusosa

Publications (2)

Publication Number Publication Date
EP0627524A1 true EP0627524A1 (de) 1994-12-07
EP0627524B1 EP0627524B1 (de) 2000-10-25

Family

ID=8537960

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94850086A Expired - Lifetime EP0627524B1 (de) 1993-05-18 1994-05-17 Blattbildungspartie in einer Papiermaschine

Country Status (5)

Country Link
EP (1) EP0627524B1 (de)
AT (1) ATE197177T1 (de)
CA (1) CA2123821C (de)
DE (1) DE69426169T2 (de)
FI (1) FI99033C (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0742314A1 (de) * 1993-11-12 1996-11-13 Valmet Paper Machinery Inc. Hybrid-Former mit einer MB Einheit in einer Papiermaschine
CN100427679C (zh) * 2006-05-31 2008-10-22 华南理工大学 脉动压力驱动脱水板的纸机夹网成形器

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI105934B (fi) * 1994-06-17 2000-10-31 Valmet Paper Machinery Inc Paperikoneen hybridiformerin kaksiviiravyöhykkeen sisäänmeno
FI96623C (fi) * 1994-08-31 1996-07-25 Valmet Paper Machinery Inc Kaksiviiraformeri, etenkin nopeille paperikoneille
FI953984A (fi) * 1995-08-24 1997-02-25 Valmet Corp Paperikoneen rainanmuodostusosa
DE10148921A1 (de) * 2001-10-04 2003-04-10 Voith Paper Patent Gmbh Maschine zur Herstellung einer Faserstoffbahn
DE10343914A1 (de) * 2003-09-19 2005-05-04 Voith Paper Patent Gmbh Entwässerungseinrichtung eines Doppelsiebformers einer Maschine zur Herstellung einer Faserstoffbahn und dazugehöriges Verfahren
EP2841644B1 (de) * 2012-04-27 2016-11-23 Valmet Technologies, Inc. Blattbildungspartie

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3329833A1 (de) * 1982-08-23 1984-03-01 A. Ahlström Oy, 29600 Noormarkku Vorrichtung zur beeinflussung einer auf einem sieb entwaesserten bahn
EP0373133A2 (de) * 1988-12-01 1990-06-13 Valmet Paper Machinery Inc. Verfahren und Vorrichtung zur Herstellung einer Papier- oder Pappbahn
WO1991002842A1 (de) * 1989-08-22 1991-03-07 J.M. Voith Gmbh Doppelsieb-former
EP0552139A1 (de) * 1992-01-17 1993-07-21 Valmet Paper Machinery Inc. Blattbildungspartie für eine Papiermaschine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI862809A (fi) * 1986-07-02 1988-01-03 Ahlstroem Oy Stoedande av en avvattningsenhet pao pappersmaskinens formningsdel.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3329833A1 (de) * 1982-08-23 1984-03-01 A. Ahlström Oy, 29600 Noormarkku Vorrichtung zur beeinflussung einer auf einem sieb entwaesserten bahn
EP0373133A2 (de) * 1988-12-01 1990-06-13 Valmet Paper Machinery Inc. Verfahren und Vorrichtung zur Herstellung einer Papier- oder Pappbahn
WO1991002842A1 (de) * 1989-08-22 1991-03-07 J.M. Voith Gmbh Doppelsieb-former
EP0552139A1 (de) * 1992-01-17 1993-07-21 Valmet Paper Machinery Inc. Blattbildungspartie für eine Papiermaschine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0742314A1 (de) * 1993-11-12 1996-11-13 Valmet Paper Machinery Inc. Hybrid-Former mit einer MB Einheit in einer Papiermaschine
US5593546A (en) * 1993-11-12 1997-01-14 Valmet Corporation Hybrid former with an MB unit in a paper machine
CN100427679C (zh) * 2006-05-31 2008-10-22 华南理工大学 脉动压力驱动脱水板的纸机夹网成形器

Also Published As

Publication number Publication date
FI932265A (fi) 1994-11-19
DE69426169D1 (de) 2000-11-30
FI99033C (fi) 1997-09-25
EP0627524B1 (de) 2000-10-25
FI99033B (fi) 1997-06-13
ATE197177T1 (de) 2000-11-15
FI932265A0 (fi) 1993-05-18
CA2123821A1 (en) 1994-11-19
DE69426169T2 (de) 2001-05-17
CA2123821C (en) 2000-05-16

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