EP0209696B1 - Stoffauflauf-Vorrichtung fuer eine Papiermaschine - Google Patents

Stoffauflauf-Vorrichtung fuer eine Papiermaschine Download PDF

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Publication number
EP0209696B1
EP0209696B1 EP86107783A EP86107783A EP0209696B1 EP 0209696 B1 EP0209696 B1 EP 0209696B1 EP 86107783 A EP86107783 A EP 86107783A EP 86107783 A EP86107783 A EP 86107783A EP 0209696 B1 EP0209696 B1 EP 0209696B1
Authority
EP
European Patent Office
Prior art keywords
section
suspension
paper
guide device
jet chamber
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.)
Expired
Application number
EP86107783A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0209696A1 (de
Inventor
Elmer Dr. Weisshuhn
Herbert Holik
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.)
Sulzer Escher Wyss GmbH
Original Assignee
Sulzer Escher Wyss 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 Sulzer Escher Wyss GmbH filed Critical Sulzer Escher Wyss GmbH
Priority to AT86107783T priority Critical patent/ATE46732T1/de
Publication of EP0209696A1 publication Critical patent/EP0209696A1/de
Application granted granted Critical
Publication of EP0209696B1 publication Critical patent/EP0209696B1/de
Expired 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
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/028—Details of the nozzle section
    • 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

Definitions

  • the invention relates to a headbox device for a paper machine with a distribution box and a guide device connected thereto for deflecting and guiding a fibrous suspension in the machine direction and for distributing the suspension over the width of the paper machine, the guide device leading into a nozzle space which has two delimiting lips and has an outlet gap leading to the paper machine, and wherein at least one delimitation lip of the nozzle space has at least two sections with different inclinations against the flow direction of the suspension in the nozzle space, the angle of inclination of the section of the upper lip delimiting the nozzle space directly adjoining the guide device between 0 ° and 30 ° is.
  • Such headbox devices are e.g. known from US-PS 4,414,061, US-PS 3,769,154 or DE-OS 2,343,538 or DE-OS 2,852,564.
  • the guide device is designed, for example, as a perforated plate or as a step diffuser, so that the suspension deflected from the distribution box in the machine direction into the nozzle area receives a certain turbulence.
  • the lips delimiting the nozzle space are generally designed as flat or slightly curved walls.
  • An adjustable diaphragm is often provided at the outlet gap at the end of the nozzle space, which is used for cross-profile correction and for increasing turbulence.
  • the orifice is usually inclined against the vertical at an angle of less than 35 ° in the direction of flow and protrudes only a short distance into the nozzle space, for example less than 5 mm, so that the ratio of the aperture projection to the gap width is usually less than 0.5 is.
  • Another document - DE-OS 3 321 406 - also represents a headbox device which is provided with a number of step diffusers as a guide device and in which the lip delimiting the nozzle space is divided by articulated connections.
  • the last lip part in the flow direction is designed in such a way that the flow cross-section is gradually reduced over a relatively long distance to the gap for the escaping suspension, a correction possibility also being able to result directly before the outlet with the aid of an orifice.
  • the invention has for its object to eliminate the above-mentioned disadvantages of the prior art and to provide a headbox device with which a sufficient formation quality of the paper web, a reduced sensitivity of the sheet weight distribution in the transverse direction with dimensional deviations of the gap width, a reduced sensitivity to jet speed differences with cross profile corrections, as well as an increased longitudinal / transverse strength ratio can be achieved.
  • this object is achieved in that the angle of inclination of the section directly in front of the outlet gap is between 60 ° and 90 °, the length of the section adjoining the guide device being a multiple of the length of the section lying in front of the outlet gap.
  • the length of the section following the guide device is particularly advantageously at least four times the length of the section located in front of the outlet gap.
  • the suspension calms down sufficiently after the deflection and turbulence generation to disperse the fiber flakes.
  • the suspension is then accelerated very strongly as a result of the greater inclination of the wall of the nozzle space, and thus existing or newly formed flakes are distorted or torn open. This creates a “soft” formation.
  • the longitudinal / transverse ratio of the strengths is increased, because the strong acceleration causes the fibers at the exit gap from the headbox to be pre-oriented in the longitudinal direction.
  • the relatively long calming section and the increased dwell time between the turbulence generator and the outlet gap further mitigate or eliminate interference from the system.
  • the acceleration is not so strong that flow eddies arise.
  • a fibrous suspension is fed to a distribution box 1 under pressure.
  • a guide device 2 connected to the distribution box deflects the suspension in the machine direction M and distributes the suspension over the width of the headbox and the paper machine.
  • the guide device 2 can consist of one or more perforated plates or a step diffuser, as described for example in CH-A-518 406 or US-A-3 725 197, or another suitable guide device.
  • the suspension From the guide device 2, the suspension enters a nozzle space 3, which is delimited on both sides by lips 4 and 5 and at the end has an outlet gap 6 from which the fibrous suspension exits onto the wet end of a paper machine, not shown.
  • At least one boundary wall of the nozzle chamber 3, for example the upper lip 4, has two different zones 7 and 8, viewed in the machine direction M, with different inclinations towards the flow direction of the suspension.
  • the first zone 7 adjoining the guide device 2 has a lower inclination a, for example between 0 ° and 30 °.
  • the zone 8 adjoining the flow direction in front of the outlet gap 6, on the other hand, has a substantially greater inclination ⁇ with respect to the flow direction, for example in the range between 60 ° and 90 °.
  • the length x of the first zone 7 is many times greater than the length y of the following zone and is, for example, at least 4 times the same.
  • the length y of zone 8 is expediently also chosen to be greater than the gap width s.
  • the lower lip 5 of the nozzle space can also be designed in the manner described, or else both lips 4 and 5. In any case, it must be ensured that the nozzle space 3 has a first zone 7 in which the Flow can calm after exiting the guide device 2, as well as a zone 8 immediately in front of the exit gap 6, in which the flow of the suspension is strongly accelerated.
  • An adjustable diaphragm 9 designed in a known manner can additionally be provided at the outlet gap. It is expedient to choose the aperture projection b so that it can be adjusted in a range between 0.05 and 0.5 times the gap width s.
  • each subsequent zone having a greater wall slope than the previous one.
  • At least one of the delimitation lips 4, 5 can be designed to be pivotable, so that the flow can thus be optimized and the width of the outlet gap 6 can be changed and adapted to the requirements.

Landscapes

  • Paper (AREA)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
  • Fats And Perfumes (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Making Paper Articles (AREA)
EP86107783A 1985-07-12 1986-06-07 Stoffauflauf-Vorrichtung fuer eine Papiermaschine Expired EP0209696B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86107783T ATE46732T1 (de) 1985-07-12 1986-06-07 Stoffauflauf-vorrichtung fuer eine papiermaschine.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH304585 1985-07-12
CH3045/85 1985-07-12

Publications (2)

Publication Number Publication Date
EP0209696A1 EP0209696A1 (de) 1987-01-28
EP0209696B1 true EP0209696B1 (de) 1989-09-27

Family

ID=4247379

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86107783A Expired EP0209696B1 (de) 1985-07-12 1986-06-07 Stoffauflauf-Vorrichtung fuer eine Papiermaschine

Country Status (7)

Country Link
US (1) US4906336A (fi)
EP (1) EP0209696B1 (fi)
JP (1) JP2666196B2 (fi)
AT (1) ATE46732T1 (fi)
CA (1) CA1281222C (fi)
DE (2) DE3533072A1 (fi)
FI (1) FI87940C (fi)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4323050C1 (de) * 1993-07-12 1995-02-16 Voith Gmbh J M Düse eines Mehrschichtenstoffauflaufes und Verfahren zum vermischungsarmen Zusammenführen mindestens zweier Stoffsuspensionsströme
US5510005A (en) * 1994-07-25 1996-04-23 Westvaco Corporation Venturi headbox for a papermaking machine
US6235159B1 (en) 1996-06-10 2001-05-22 Beloit Technologies, Inc. Convergent flow headbox
US5882482A (en) * 1996-06-10 1999-03-16 Beloit Technologies, Inc. Convergent flow headbox
US6033527A (en) * 1998-07-06 2000-03-07 Beloit Technologies, Inc. Paper machine edge fiber alignment control by angled headbox sides
US7384548B2 (en) * 2002-07-01 2008-06-10 Terrien Richard J Manually controlled skimming of industrial oil contaminants
DE10318035A1 (de) * 2003-04-19 2004-11-04 Voith Paper Patent Gmbh Stoffauflauf

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1809937A (en) * 1929-04-20 1931-06-16 Hilsheimer Forrest Inlet for paper making machines
GB733441A (en) * 1952-10-20 1955-07-13 Paper Patents Co Improvements in or relating to a paper making machine
FR1396309A (fr) * 1963-04-11 1965-04-23 Karlstad Mekaniska Ab Boîte collectrice pour machine à papier
FR1494138A (fr) * 1966-05-25 1967-09-08 Beloit Corp Perfectionnements relatifs à la construction d'une tête de machine à papier
DE1941424C3 (de) * 1969-08-14 1980-07-10 Escher Wyss Gmbh, 7980 Ravensburg Stoffauflauf für eine Papiermaschine
BE759413A (fr) * 1969-12-13 1971-04-30 Voith Gmbh J M Caisson d'arrivee de pate, notamment pour machines a papier
US3738910A (en) * 1972-02-08 1973-06-12 Allis Chalmers Nozzle adjusting arrangement for a papermaking machine headbox
US3853695A (en) * 1972-10-12 1974-12-10 S Back Entraining a liquid into a fiber slurry to accelerate it prior to discharge from a flow path onto a forming wire
ZA735253B (en) * 1972-10-12 1974-07-31 Crown Zellerbach Corp Apparatus and method for delivering a fiber slurry
AT331631B (de) * 1973-07-13 1976-08-25 Voith Gmbh J M Stoffauflauf fur papiermaschinen u.dgl.
FI773744A (fi) * 1977-12-12 1979-06-13 Tampella Oy Ab Hydraulisk inloppslaoda foer en pappersmaskin eller liknande
DE2825612C2 (de) * 1978-06-10 1980-05-14 J.M. Voith Gmbh, 7920 Heidenheim Stoffauflauf für Papiermaschinen
SU964044A1 (ru) * 1980-11-06 1982-10-07 Центральный Научно-Исследовательский И Проектно-Конструкторский Институт По Проектированию Оборудования Для Целлюлозно-Бумажной Промышленности Напорный щик бумагоделательной машины
US4414062A (en) * 1981-11-18 1983-11-08 Valmet Oy Headbox of a paper machine
DE3321406A1 (de) * 1983-06-09 1984-12-13 Escher Wyss Gmbh, 7980 Ravensburg Stoffauflauf fuer eine papiermaschine

Also Published As

Publication number Publication date
EP0209696A1 (de) 1987-01-28
ATE46732T1 (de) 1989-10-15
FI862919A0 (fi) 1986-07-11
FI862919A (fi) 1987-01-13
JPS6215393A (ja) 1987-01-23
FI87940B (fi) 1992-11-30
FI87940C (fi) 1993-03-10
CA1281222C (en) 1991-03-12
JP2666196B2 (ja) 1997-10-22
US4906336A (en) 1990-03-06
DE3533072A1 (de) 1987-01-22
DE3533072C2 (fi) 1988-12-15
DE3665895D1 (en) 1989-11-02

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