EP1424437A1 - Section de formage à deux toiles - Google Patents

Section de formage à deux toiles Download PDF

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Publication number
EP1424437A1
EP1424437A1 EP03104434A EP03104434A EP1424437A1 EP 1424437 A1 EP1424437 A1 EP 1424437A1 EP 03104434 A EP03104434 A EP 03104434A EP 03104434 A EP03104434 A EP 03104434A EP 1424437 A1 EP1424437 A1 EP 1424437A1
Authority
EP
European Patent Office
Prior art keywords
twin
wire former
former according
guide element
white water
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.)
Withdrawn
Application number
EP03104434A
Other languages
German (de)
English (en)
Inventor
Stefan Lehner-Dittenberger
Alfred Dr. Bubik
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
Publication of EP1424437A1 publication Critical patent/EP1424437A1/fr
Withdrawn legal-status Critical Current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
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • 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 twin wire former, a machine for manufacturing a fibrous web, in particular paper or cardboard web, with a rotating one endless top sieve and a circulating endless bottom sieve, which in the Area of a forming element converge, as well as with at least one White water collecting tank.
  • this can be a so-called Gap former, and in particular a gap former for the production of Trade cardboard and / or packaging paper.
  • Twin wire formers of the type mentioned are, for example, from the Publications DE 196 51 493 A1, DE 198 03 591 A1 and EP 0 258 918 A1 known.
  • Gapformers for the production of cardboard and packaging paper were also used increasing machine speeds and machine widths in the headbox amount of water to be supplied increased.
  • the receptacles used to remove the white water had to be used larger amounts of white water can be adjusted.
  • the collecting containers had to in particular can also be built high enough to do this by the forming rollers centrifuged white water pouring into the container there an accumulated backwater height to dissipate and there largely to calm.
  • the large-sized collecting container means that the two Rolls in the "DuoFormer Top” type twin wire former (see e.g. DE 196 51 453 A1) or of the “DuoFormer Base” type (cf. DE 198 03 591 A1) far apart have to be positioned and the overall height of the gap formers increases.
  • Both of the rollers mentioned are the forming roller, in their area the two sieves converge, and around them behind in the direction of the flow of material provided deflection roller arranged within the loop of the top wire.
  • the large distance between these rollers and the correspondingly large overall height The gap former in turn cause support elements between the two rollers for the two sieves that have to be arranged on one or Support the sieves on both sides and help eliminate sieve tubes.
  • the disadvantage here is that the preformed paper sheet is damaged again can be.
  • the invention has for its object to provide an improved twin wire former of the type mentioned, in which the disadvantages mentioned above are eliminated.
  • a correspondingly coordinated white water discharge should be ensured.
  • the backwater should be able to be discharged safely across the width, even with wider molders, with a limited cross section.
  • This object is achieved in that at least one guide element is provided, via the white water accumulating in the former, the white water collecting container is fed so that it is in the white water collecting container an at least essentially calm white water surface results.
  • the guide elements are particularly close to rotating parts such as rollers and / or in the immediate vicinity of translational moving screens can be attached without the sheet formation too disrupt, but rather improve the formation and earliest possible Separation of water and air enables as well as that of rollers, sieves and the amount of air moving with the water can be minimized.
  • the guide element can preferably be designed and / or arranged such that the energy contained in the white water produced by this guide element at least partially degraded, i.e. the resulting white water through this Guide element is calmed accordingly.
  • the guide element can, for example, in an inlet area of the white water collecting container and / or at least partially in the white water collecting container be provided.
  • the guide element can be structured, for example. It can in particular with Slots and / or be provided with holes through which at least one Part of the white water reaches the collecting container.
  • the energy of the white water can be targeted be dismantled, so that there is a calm suspension surface in the container results.
  • At least one guide element is advantageously provided in the region of a roller.
  • the forming element is preferably formed by a forming roller and at least one guide element is provided in the region of this forming roller.
  • at least one guide element in the area of an in Material flow direction behind the forming element within the top wire loop arranged deflecting roller may be provided.
  • Twin wire former is the guide element around an axis at least approximately parallel axis of the roller in question. This is the guiding element preferably curved towards the roller.
  • the inner radius of curvature of the guide element is expediently larger than the outer roller radius.
  • the distance between the inner surface of the guide element and the outer surface of the Roll is preferably in a range of about 10 to 200 mm.
  • the length of the guide element measured parallel to the roller axis is advantageously in a range from about 0.1 to about 1.5 m.
  • the thickness of the guide element is preferably in a range from approximately 4 to 20 mm.
  • the guide element has a smooth surface.
  • the white water flow can be over the width of the twin wire former measured across the material flow direction and at top speed from the former to one side open or partially closed containers are transported, whereby a low overall height of the former is reached, the dwell time of the white water minimized and at the same time achieved good degassing of the white water and thus the formation is improved again.
  • An expedient practical embodiment of the twin wire former according to the invention is characterized by the fact that the white water collecting container is arranged to the side of the forming area and the resulting white water through the preferably smooth guide element generally transverse to the material flow direction in the lateral white water collecting container is passed.
  • the guide element especially in a receiving the white water, with the White water collecting container communicating housing can be arranged.
  • Means for air / water separation are preferably assigned to the housing.
  • the white water collecting container can, for example, be designed as a calming tower his.
  • the guide element is folded and / or provided with steps.
  • the guide element on at least two in the flow direction of the white water chamfered positions one behind the other.
  • the bending angle at the front bending point in the flow direction in a range from about 150 to about 110 ° and the folding angle at the rear Bending point in a range from about 160 to about 120 °.
  • the width of the guide element measured in the direction of web travel is preferably in a range from about 350 to about 1500 mm.
  • the total length of the at least one guide element measured in the transverse direction comprising guide means is preferably in a range of about 4,000 up to about 11,000 mm.
  • At least one guide device with several in the transverse direction successive guide elements are provided, the successive n-de Guiding elements at least partially overlap.
  • the coverage can in particular in the range from 0 to about 200 mm.
  • Air extraction areas are preferably provided between the guide elements.
  • Twin wire former is at least one guide device with several in the transverse direction successive guide elements provided, the mutual Distance is in particular in a range from about 50 to about 400 mm.
  • the water speed can be, for example, 1 to 0.3 times the sieving speed.
  • the white water collecting container can be vacuumed at least in some areas can be acted upon to separate air from water.
  • At least one guide element in the area an upper quadrant and / or at least one guide element in the area of two lower quadrants of a respective roller and / or at least one Guide element below the two lower quadrants of a respective roller is arranged.
  • the difference in height is between the lower area of the forming roller and the lower area the deflection roller arranged within the loop of the top wire is about 1.5 up to about 3.5 m.
  • the angle measured from the vertical at which the two sieves run off the forming roll in the material flow direction is preferably in a range from 0 to 60 °.
  • the angle measured with respect to the vertical, with which the lower sieve points to the Forming roll runs for example, in a range from 0 to about 20 ° lie.
  • a slow-like Shaper section assigned at least one guide element, which in the material flow direction is arranged in front of a calming tower.
  • the total amount of water to be removed by the guide elements can be, for example are in the range of 30,000 l / min and about 200,000 l / min.
  • a respective forming element can, for example, from at least one bar or from one consist of several last shaped shoe.
  • the white water tank can be inside or outside the Formers can be arranged.
  • the guide element or elements can be between the relevant roller, i.e. to the Example of the forming roller or the deflecting roller, and the white water collecting container be provided.
  • Figure 1 shows a schematic representation of a twin wire former 10, in which it is a "DuoFormer Top" gap former. He is part of one Machine for producing a fibrous web, which is in particular a paper or cardboard web can act. He can in particular Production of cardboard and packaging paper may be provided.
  • the twin wire former 10 comprises a continuous endless top wire 12 and a revolving endless bottom wire 14, which in the area here by a forming roller 16 formed forming element converge. In the thereby The formed entry gap 18 is made of a pulp suspension 20 by means of a headbox brought in.
  • the upper wire 12 is moved around a lower one Deflection roller 22 out. There are more within the loop of the top wire 12 Deflection rollers 24 are provided, via which the top wire 12 to the inlet gap 18th is returned, in the area of which there is a so-called breast roller 26 is led.
  • the lower wire 14 is in the region of the deflecting roller 22 already separated from the top sieve 12.
  • a white water collecting container 30 is provided, which is therefore inside the former. Below the two lower quadrants the forming roller 16 is another within the loop of the lower wire 14 White water collecting container 30 is provided. Also this white water collecting container 30 thus lies within the twin wire former 10.
  • Guide elements 32 are assigned to the two white water collecting containers 30. These guide elements 32 can be designed and / or arranged such that the White water accumulating in the relevant area of the former White water collecting container 30 is supplied so that there is a results in at least essentially a calm white water surface.
  • Structured guide elements 32 can be used, for example, through which the energy of the white water is specifically reduced, so that in the respective container 30 results in a smooth suspension surface.
  • the guide elements 32 can in particular thus be designed and / or arranged in this way be that the energy contained in the resulting white water through this Guide element at least partially dismantled, i.e. the resulting white water this guide elements 32 is calmed accordingly.
  • the guide elements 32 are at least partially in the respective White water collecting container 30 is arranged.
  • a respective guide element 32 can in particular be structured his.
  • it can be provided with slots and / or holes be through which at least part of the white water into the collecting container arrives.
  • the guide elements 32 can about an at least approximately to the axis of the foaming roller 16 parallel axis can be curved. These guide elements 32 as can be seen from FIG. 1, curved toward the forming roller 16. The inner radius of curvature of the guide elements 32 can in particular be greater than the outer radius of the forming roller 16.
  • the distance between the inner surface of the forming roller 16 facing a respective guide element 32 and the outer surface of the forming roller 16 can for example are in a range from about 10 to about 20 mm.
  • Forming elements 32 may be provided.
  • the parallel to the roller axis The measured length of the guide elements 32 can be in a range, for example from about 0.1 to about 1.5 m.
  • the thickness of the guide elements 32 can be, for example, approximately 4 to approximately 20 mm.
  • the twin wire former 10 according to FIG. 2 is a gap former of the type "DuoFormer Base”.
  • FIG. 2 Twin wire former 10 shown first in that not only the top wire 12, but also the bottom wire 14 around the lower deflecting roller 22 is led. In the area of the following deflection roller 24, the top wire 12 then separated from the lower sieve 14.
  • those in the present case are in the range the upper left quadrant of the forming roller 16 provided guide elements 32 not structured, i.e. smooth. In contrast, they are in the area below the forming roller 16 provided guide elements 32 structured again.
  • the guide elements 32 provided in this twin wire former 10 can in particular be as curved as in connection with the Embodiment according to Figure 1 was described.
  • this embodiment according to FIG. 2 can at least essentially again have the same structure as that of Figure 1. each other corresponding parts are assigned the same reference numerals.
  • the twin wire former 10 shown in FIGS. 3 and 4 is concerned again a gapformer of the type "DuoFormer Top” or of the type “DuoFormer Base ".
  • the white water collecting container 30 (cf. e.g. FIGS. 5 and 6), however, arranged to the side of the forming area, the resulting white water through the preferably smooth guide elements 32 generally transversely to the material flow direction in the side white water collecting container 30 is directed.
  • the guide elements 32 can be placed in a white water housing 30 communicating with the side white water collecting container 34 be arranged.
  • a white water housing 30 communicating with the side white water collecting container 34 be arranged.
  • the embodiment according to FIG. 4 moreover, generally below that wrapped by the two screens 12, 14 Deflection roller 22 such a housing 34 provided with guide elements 32 arranged.
  • the housings 34 are each provided within the forming area are, the associated white water collection container 30 are laterally outside this formation area.
  • FIG 5 shows a schematic, sectional front view with such Guide elements 32 provided with a side white water collecting container 30 communicating housing 34.
  • Figure 6 shows this housing 34 with associated White water collecting container 30 in a schematic plan view.
  • Means for air / water separation can be assigned to the housing 34.
  • the white water collecting container 30 can be designed as a calming tower.
  • the air Q L for example, can be led upwards and the water Q W, for example, downwards from the white water collecting container 30.
  • the guide elements 32 can each be folded.
  • one bending point can be used a bevel angle in a range of preferably about 150 to about 110 ° can be provided.
  • FIGS. 7 and 8 show a further embodiment of one in a housing 34 arranged guiding elements 32 comprising guiding device.
  • the guide elements 32 are connected to two in the flow direction of the White water behind successive points 36, 38 folded.
  • the Bending angle at the front bending point 36 in the flow direction for example again in a range from about 150 to about 110 ° and the bending angle at the rear folding point 38, for example in a range of approximately 160 are up to about 120 °.
  • the entry e.g. vertical and the exit e.g. is horizontal
  • a purely arithmetical sum of the interior angles of 270 ° if the transition from vertical to horizontal occurs with two bends becomes.
  • entry does not have to be vertical and exit does not have to be done horizontally.
  • Air extraction areas or openings 40 can be provided between the guide elements 32, via which air can be discharged into a channel 42, for example via intermediate channels 41.
  • the remaining water / air mixture Q W + Q L is discharged laterally via the housing 34 and air Q L via the duct 42.
  • each guide element 32 can be in the transverse direction successive guide elements 32 at least partially cover.
  • the respective overlap 44 can be in a range of 0, for example up to about 200 mm.
  • the distance 46 between the different guide elements 32 can be in one Range from about 50 to about 400 mm, for example.
  • the width B of the guide elements 32 measured in the web running direction can be in one Range from about 350 to about 1500 mm, for example.
  • the cross direction measured total length L of the plurality of guide elements 32 Guide means can range, for example, from about 4,000 to about 11 000 mm.
  • the height difference can between the lower portion of the forming roller 16, i.e. their "6 o'clock” position and the lower area or the "6 o'clock” position within the loop the top wire 12 arranged deflection roller 22 for example about 1.5 to about 3.5 mm.
  • the angle measured with respect to the vertical 48, with which the two sieves 12, 14 can run from the forming roller 16 in the material flow direction, for example are in a range from 0 to about 60 ° (see e.g. Figure 2).
  • the opposite the vertical measured angle with which the bottom wire 14 onto the forming roller 16 accumulates, for example, can be in a range from 0 to approximately 80 °.
  • At least one further forming element 50 is provided, which is defined by an or multiple lasts or from a shoe formed by multiple lasts or the like can exist.
  • FIG. 9 shows a view of a further embodiment comparable to FIG. 5 with curved guide elements 32.
  • the entire white water flow (water / air mixture) Q WL is divided into at least two partial flows Q WLi by at least one guide element 32 with a distance 46 from a respective further guide element or to the boundary of the white water channel .
  • the partial flows are again combined to form the total flow Q WL .
  • the guide elements 32 have on their outlet side, in addition to the overlap 44, a vertical distance 54 from one another which corresponds to the height of the respective partial flows, so that the vertical position of the guide element end increases gradually towards the outlet side of the white water channel.
  • the combination of the first partial flow with the subsequent partial flow takes place only after the first partial flow has been completely or predominantly deflected, so that no or at least a slight disturbance of the subsequent partial flow is thereby brought about. Larger turbulence is thus prevented, which reduces the air impact and calms the screen surface.
  • Figure 10 shows a schematic representation of a slow-moving section of a Gapformers 10 with an arrangement of guide elements 32 in front of one White water collecting container 30 assigned calming tower 52.
  • the guide elements 32 can at least partially again in a respective housing 34 be arranged.
  • the housings 34 can be at least partially laterally White water collecting container open out.
  • the calming tower recognizable in FIG. 10 52 can be subjected to vacuum in the upper area. Through guidance elements 32 the water is directed downwards in particular. The water flows down into a white water collecting container 30.

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EP03104434A 2002-11-29 2003-11-28 Section de formage à deux toiles Withdrawn EP1424437A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10255908 2002-11-29
DE2002155908 DE10255908A1 (de) 2002-11-29 2002-11-29 Doppelsiebformer

Publications (1)

Publication Number Publication Date
EP1424437A1 true EP1424437A1 (fr) 2004-06-02

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EP03104434A Withdrawn EP1424437A1 (fr) 2002-11-29 2003-11-28 Section de formage à deux toiles

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EP (1) EP1424437A1 (fr)
DE (1) DE10255908A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008029427A1 (fr) * 2006-09-06 2008-03-13 A. Celli Paper S.P.A. Machine à papier à formation humide avec systèmes pour réduire la turbulence dans les circuits pâte liquide d'eau et procédé connexe
WO2011081594A1 (fr) * 2009-12-28 2011-07-07 Metso Paper Karlstad Ab Unité et procédé de désaération d'eau d'égouttage
WO2012052263A1 (fr) * 2010-10-19 2012-04-26 Voith Patent Gmbh Unité de formation de feuille pour fabriquer une bande de matériau et procédé pour faire fonctionner l'unité de formation de feuille
WO2016189101A1 (fr) 2015-05-27 2016-12-01 Valmet Aktiebolag Appareil et procédé de traitement d'eau collée dans une machine à papier
SE2150607A1 (en) * 2021-05-12 2022-11-13 Valmet Oy Water and air separation device for removing air from a whitewater spray

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2652415A1 (de) * 1975-11-19 1977-05-26 Karlstad Mekaniska Ab Vorrichtung zum auffangen von fluessigkeiten
DE3532716A1 (de) * 1985-07-30 1987-02-12 Escher Wyss Gmbh Vorrichtung zum abbremsen schiessender stroemungen von siebwasser
US6398913B2 (en) * 1999-12-16 2002-06-04 Metso Paper Karlstad Aktiebolag Arrangement and method for recovery of energy in a paper machine forming section

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2652415A1 (de) * 1975-11-19 1977-05-26 Karlstad Mekaniska Ab Vorrichtung zum auffangen von fluessigkeiten
DE3532716A1 (de) * 1985-07-30 1987-02-12 Escher Wyss Gmbh Vorrichtung zum abbremsen schiessender stroemungen von siebwasser
US6398913B2 (en) * 1999-12-16 2002-06-04 Metso Paper Karlstad Aktiebolag Arrangement and method for recovery of energy in a paper machine forming section

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101517161B (zh) * 2006-09-06 2012-01-11 亚赛利纸业设备股份公司 连续湿式成形造纸机
WO2008029427A1 (fr) * 2006-09-06 2008-03-13 A. Celli Paper S.P.A. Machine à papier à formation humide avec systèmes pour réduire la turbulence dans les circuits pâte liquide d'eau et procédé connexe
US8784538B2 (en) 2009-12-28 2014-07-22 Valmet Ab Unit and method for deaeration of drainage water
WO2011081594A1 (fr) * 2009-12-28 2011-07-07 Metso Paper Karlstad Ab Unité et procédé de désaération d'eau d'égouttage
CN102686796A (zh) * 2009-12-28 2012-09-19 梅特索·佩珀·卡尔斯塔德公司 用于对排出水进行除气的单元和方法
EP2519690A1 (fr) * 2009-12-28 2012-11-07 Metso Paper Karlstad AB Unité et procédé de désaération d'eau d'égouttage
EP2519690A4 (fr) * 2009-12-28 2013-05-15 Metso Paper Sweden Ab Unité et procédé de désaération d'eau d'égouttage
CN102686796B (zh) * 2009-12-28 2014-12-24 瓦尔梅特有限公司 用于对排出水进行除气的单元和方法
US9011642B2 (en) 2010-10-19 2015-04-21 Voith Patent Gmbh Sheet forming unit for producing a material web and method for operating the sheet forming unit
US8784614B2 (en) 2010-10-19 2014-07-22 Voith Patent Gmbh Sheet forming unit for producing a material web and method for operating the sheet forming unit
CN103270215A (zh) * 2010-10-19 2013-08-28 沃依特专利有限责任公司 用于制造材料幅的纸页成形单元以及纸页成形单元的运行方法
WO2012052263A1 (fr) * 2010-10-19 2012-04-26 Voith Patent Gmbh Unité de formation de feuille pour fabriquer une bande de matériau et procédé pour faire fonctionner l'unité de formation de feuille
CN103270215B (zh) * 2010-10-19 2016-07-06 沃依特专利有限责任公司 用于制造材料幅的纸页成形单元以及纸页成形单元的运行方法
WO2016189101A1 (fr) 2015-05-27 2016-12-01 Valmet Aktiebolag Appareil et procédé de traitement d'eau collée dans une machine à papier
WO2016189100A1 (fr) 2015-05-27 2016-12-01 Valmet Aktiebolag Appareil et procédé de traitement d'eau blanche dans une machine à papier
US10550517B2 (en) 2015-05-27 2020-02-04 Valmet Aktiebolag Apparatus and method for processing white water in a paper machine
US11028533B2 (en) 2015-05-27 2021-06-08 Valmet Aktiebolag Apparatus and method for processing white water in a paper machine
SE2150607A1 (en) * 2021-05-12 2022-11-13 Valmet Oy Water and air separation device for removing air from a whitewater spray
SE545391C2 (en) * 2021-05-12 2023-07-25 Valmet Oy Water and air separation device for removing air from a whitewater spray

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