EP0393656A1 - Assemblage dans une machine à papier pour effet d'assèchement vers le haut - Google Patents

Assemblage dans une machine à papier pour effet d'assèchement vers le haut Download PDF

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Publication number
EP0393656A1
EP0393656A1 EP90107413A EP90107413A EP0393656A1 EP 0393656 A1 EP0393656 A1 EP 0393656A1 EP 90107413 A EP90107413 A EP 90107413A EP 90107413 A EP90107413 A EP 90107413A EP 0393656 A1 EP0393656 A1 EP 0393656A1
Authority
EP
European Patent Office
Prior art keywords
wire
roll
section
dewatering
twin
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
EP90107413A
Other languages
German (de)
English (en)
Other versions
EP0393656B1 (fr
Inventor
Ventola Jouko
Savia Risto
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 Tampella Oy
Original Assignee
Valmet Tampella Oy
Tampella Oy AB
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 Valmet Tampella Oy, Tampella Oy AB filed Critical Valmet Tampella Oy
Priority to AT90107413T priority Critical patent/ATE101669T1/de
Publication of EP0393656A1 publication Critical patent/EP0393656A1/fr
Application granted granted Critical
Publication of EP0393656B1 publication Critical patent/EP0393656B1/fr
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
    • 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 present invention relates to an assembly in a paper or cardboard machine for effecting upward dewatering, the assembly being defined in the preamble portion of claim 1.
  • the invention is intended for the twin-wire section of a paper or cardboard machine. Within this section another wire is guided by means of a forming roll on top of the fourdrinier wire situated in the initial portion of the paper machine and on top of the fibrous web formed thereon, the web having been subjected to initial drainage.
  • dewatering takes place through both the upper and lower wire, and the control of the dewatering within this section is one of the most important factors effecting the formation of a paper web.
  • dewatering means operating at a subatmospheric pressure are used as a rule only on the side of the lower wire. These means include suction shoes, suction boxes and the like. Such solutions are disclosed for example in Finnish Patent Application Publication No. 75375 as well as in Finnish Patent Application No. 873034. As the speeds of the paper machines increase, the mastering of the dewatering has become a problem. In this connection it has been discovered that it has not been possible to influence the presence of flocks on the top surface of the paper to a sufficient extent.
  • the purpose of the invention is to provide an improvement as regards to the drawbacks presented hereinabove and to disclose an assembly by means of which dewatering in the twin-wire section can be better effected both on the side of the upper wire and on the side of the lower wire.
  • the assembly according to the invention is mainly characterised by what is disclosed in the characterising clause of claim 1.
  • a dewatering means connected to means effecting suction.
  • said means water can be removed in a controllable and adjustable manner also through the upper wire, in which event the fibrous flocks on the top surface of the paper web under formation can be disintegrated.
  • the consistency of the stock after the forming roll is still so low that said flocks can still be disintegrated by shearing forces.
  • the path of travel of the twin-wire section is straight at the location of the dewatering means on the upper wire side.
  • the controllability of the dewatering is thus improved at said location.
  • the means on the upper wire side effecting dewatering and a guide surface following the curvature of the forming roll are incorporated to the same structure.
  • the twin-wire section of the paper machine shown in Fig. 1 is preceded by a single-wire fourdrinier wire section, on which the fibrous stock is supplied from a head box.
  • the fibrous stock advances on top of the fourdrinier wire 1 towards the twin-wire section and the initial drainage takes place at this point, the result of which is the dewatering of the fibrous web W under formation downwards through the fourdrinier wire 1.
  • An upper wire 2 is introduced from above through a wire guiding roll 9 situated above the fourdrinier wire 1, whereafter the upper wire 2 joins the fourdrinier wire 1 on a forming roll 3.
  • the wires 1 and 2 wrap, the web W entrapped therebetween, the roll 3 within a sector ⁇ and leave the roll at a point, which is situated above the imaginary extension of the plane along which the fourdrinier wire 1 travels before the roll 3.
  • the wires 1 and 2 are directed obliquely upwards, and the wires 1 and 2 travel along a straight part onto a roll 6 having a smooth surface and being located on the side of the lower wire 1.
  • the wires 1 and 2 are curved again in an opposite direction compared with the curvature on the roll 6, being directed after this location obliquely downwards.
  • the wires 1 and 2 travel onto a reversing roll 8 having a smooth surface, whereafter the upper wire 2 is separated from the lower wire while being guided by the wire guiding roll 10.
  • the web W travels on top of the lower wire 1 towards the press section.
  • the separation of the web onto the lower wire 1 is effected by means of transfer suction boxes, on which the lower wire 1 is passed after the roll 8 and which are denoted by reference numerals 11 in the drawing.
  • the forming roll 3 has an open surface and at its location the water is pressed out of the web W in both directions through the lower wire 1 and the upper wire 2.
  • the water pressed through the upper wire 2 flows into the open points of the surface of the roll 3, and it is transferred under the influence of the centrifugal force due to the rotation of the roll and guided by a guiding surface 7 following the curvature of the outer surface of the roll after the sector ⁇ in the direction of rotation of the roll.
  • the water slung on the surface 7 by the roll 3 will end in a trough or gutter 13, which is situated on the front side of the roll 3 between the wire guide roll 9 and the roll 3.
  • the lower edge of the guide surface 7 terminates at a short distance above the upper wire 2 leaving a small gap between the lower edge and the upper wire 2.
  • the upper wire 2 is thus not subjected to mechanical stress due to the guiding surface.
  • a straight suction box 4 lying against the lower wire 1 in the straight section following the roll 3.
  • the suction box 4 is connected to means effecting suction and water is removed from the web through the lower wire 1 and through the open surface of the box.
  • a stationary dewatering means 5 comprising an autoslice 5a situated first in the direction of travel of the webs and one or several suction boxes 5b situated thereafter.
  • the surfaces of the suction boxes comprise bars or blades extending transversely to the direction of travel of the wires, and the dewatering takes place therebetween through the upper wire 2 by virtue of suction provided in the suction boxes 5b.
  • the autoslice 5a is also connected to suction and the suction within these different compartments may be controllable independently of each other.
  • the autoslice 5a and suction boxes 5b guide the wires 1 and 2 along a straight path of travel, which is parallel with the common tangent of the roll 3 and the roll 6. After the dewatering means 5 there is still another straight suction box 4 on the side of the lower wire, situated before the smooth-­faced roll 6, on which the wires are turned towards the reversing roll 8.
  • Fig. 2 there is shown another alternative of the assembly according to the invention.
  • the twin-wire section is, like in the embodiment of Fig. 1, preceded by a straight fourdrinier wire section 1 and the top or upper wire 2 is led from above by means of a wire guiding roll 9 on top of the lower wire 1 and the web W lying thereon.
  • the wires 1 and 2 come together on the surface of an open-faced forming roll 3, on which they are curved together upwards, the web entrapped therebetween, within a predetermined sector ⁇ .
  • the surface of the suction box 5 on the upper wire side is in contact with the upper wire 2 by means of its transversely extending bars or blades, which define intermediate spaces, through which the dewatering can take place upwards through the upper wire 2 by means of suction connected to the suction box 5.
  • the path of the wires is guided entirely by the straight wire guiding surface of this suction box and a free space remains on the lower wire side.
  • the water pressed through the lower wire 1 will be removed by the deflector action of the front edge of a suction box 4 situated before the roll 6.
  • the dewatering is still quite gentle and easily controllable at the upper dewatering means.
  • By adjusting the suction in the upper suction box 5 it is thus possible to control the dewatering upwards making it possible to disintegrate the fibrous flocks.
  • the suction box 5 is integrated to the same structure as is the curved guide surface 7, which forms the wall of the suction box 5 facing the surface of the roll 3 situated after the sector ⁇ .
  • a more simple construction and a somewhat shortened length is obtained by this arrangement. Further, the autoslice requiring a great amount of air is avoided.
  • the water collected to the open areas of roll 3 is slung by the centrifugal force upwards and will be guided by the guide surface 7 finally to the trough 13 between the rolls 9 and 3.
  • the interior of the suction box 5 contains a partition 5c dividing the suction box 5 to a channel 5d extending along the whole width of the web between the partition 5c and the suction box rear wall 5e facing the direction of travel of the wires.
  • the channel 5d is at its lower region in connection with the open spaces between the bars or blades on the wire guiding surface and thus directs the water collected through these spaces obliquely upwards.
  • the partition 5c terminates before the upper wall of the suction box and the water passed through the channel 5d is directed backwards to a space 5f bounded by the wall forming the guide surface 7, the partition 5c, and the bottom lying above the wire guiding surface of the suction box 5.
  • the space 5f Between the bottom of the space 5f and the wire guiding surface there is a space, to which the water is first passed between the bars or blades, the height of this space increasing in the direction of travel of the wires.
  • the space terminates at the lower end of the channel 5d and continues as the channel, which is directed more upwards. From the space 5f the water can be drawn off by conventional means not shown.
  • the invention is not restricted only to the embodiments shown by the Figures and explained in the description, but is can be modified within the scope presented by the appended claims.
  • the surfaces of the upper wire dewatering means may be also slightly curved, the radius of this curvature being, however, many times greater than that of the preceding forming roll.

Landscapes

  • Paper (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Fats And Perfumes (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Sink And Installation For Waste Water (AREA)
EP90107413A 1989-04-19 1990-04-19 Assemblage dans une machine à papier pour effet d'assèchement vers le haut Expired - Lifetime EP0393656B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90107413T ATE101669T1 (de) 1989-04-19 1990-04-19 Einrichtung in einer papiermaschine zur erzielung von aufwaertsentwaesserung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI891853 1989-04-19
FI891853A FI86652C (fi) 1989-04-19 1989-04-19 Anordning i en pappersmaskin foer aostadkommande av avvattning pao oeversidan.

Publications (2)

Publication Number Publication Date
EP0393656A1 true EP0393656A1 (fr) 1990-10-24
EP0393656B1 EP0393656B1 (fr) 1994-02-16

Family

ID=8528269

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90107413A Expired - Lifetime EP0393656B1 (fr) 1989-04-19 1990-04-19 Assemblage dans une machine à papier pour effet d'assèchement vers le haut

Country Status (5)

Country Link
EP (1) EP0393656B1 (fr)
AT (1) ATE101669T1 (fr)
CA (1) CA2014790A1 (fr)
DE (1) DE69006623T2 (fr)
FI (1) FI86652C (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6982025B2 (en) 2000-12-15 2006-01-03 Astenjohnson, Inc. Adjustable resilient blade support
US6984291B2 (en) 2000-12-15 2006-01-10 Astenjohnson, Inc. Vacuum box with skimmer blade

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8888407B2 (en) 2010-06-21 2014-11-18 Edmond D. Krecke Method and a device for sealing and/or securing a borehole
DE102010024496A1 (de) * 2010-06-21 2011-12-22 Edmond D. Krecké Verfahren und Vorrichtung zum Verschließen eines Bohrloches

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4561939A (en) * 1984-03-26 1985-12-31 Beloit Corporation Extended nip press arrangement
DE3534836A1 (de) * 1984-10-03 1986-04-17 Valmet Oy, Helsinki Verfahren zur entwaesserung einer faserstoffbahn, insbesondere papier- oder kartonbahn, und eine das verfahren anwendende papiermaschinennasspresse
DE3604522A1 (de) * 1985-02-18 1986-09-04 Valmet Oy, Helsinki Papiermaschinenpressenpartie mit separaten pressenspalten
FI75375B (fi) * 1982-03-02 1988-02-29 Valmet Oy Banformningsparti foer pappersmaskin.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3138133C2 (de) * 1981-09-04 1986-03-06 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Entwässerungseinheit für Langsieb-Papiermaschinen
FI862808A (fi) * 1986-07-02 1988-01-03 Ahlstroem Oy Foerfarande och anordning foer avvattning av en fiberbana.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI75375B (fi) * 1982-03-02 1988-02-29 Valmet Oy Banformningsparti foer pappersmaskin.
US4561939A (en) * 1984-03-26 1985-12-31 Beloit Corporation Extended nip press arrangement
DE3534836A1 (de) * 1984-10-03 1986-04-17 Valmet Oy, Helsinki Verfahren zur entwaesserung einer faserstoffbahn, insbesondere papier- oder kartonbahn, und eine das verfahren anwendende papiermaschinennasspresse
DE3604522A1 (de) * 1985-02-18 1986-09-04 Valmet Oy, Helsinki Papiermaschinenpressenpartie mit separaten pressenspalten

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6982025B2 (en) 2000-12-15 2006-01-03 Astenjohnson, Inc. Adjustable resilient blade support
US6984291B2 (en) 2000-12-15 2006-01-10 Astenjohnson, Inc. Vacuum box with skimmer blade

Also Published As

Publication number Publication date
FI86652B (fi) 1992-06-15
FI891853A (fi) 1990-10-20
DE69006623D1 (de) 1994-03-24
DE69006623T2 (de) 1994-07-21
FI891853A0 (fi) 1989-04-19
EP0393656B1 (fr) 1994-02-16
ATE101669T1 (de) 1994-03-15
FI86652C (fi) 1992-09-25
CA2014790A1 (fr) 1990-10-19

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