EP0889162A2 - Section de formage - Google Patents

Section de formage Download PDF

Info

Publication number
EP0889162A2
EP0889162A2 EP98108651A EP98108651A EP0889162A2 EP 0889162 A2 EP0889162 A2 EP 0889162A2 EP 98108651 A EP98108651 A EP 98108651A EP 98108651 A EP98108651 A EP 98108651A EP 0889162 A2 EP0889162 A2 EP 0889162A2
Authority
EP
European Patent Office
Prior art keywords
upper lip
pressure
sieve
shaper according
stiffening element
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
EP98108651A
Other languages
German (de)
English (en)
Other versions
EP0889162B1 (fr
EP0889162A3 (fr
Inventor
Günter Dr. Halmschlager
Herbert Haunlieb
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 Sulzer Papiermaschinen GmbH
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
Priority claimed from DE1997127929 external-priority patent/DE19727929A1/de
Application filed by Voith Sulzer Papiermaschinen GmbH, Voith Paper Patent GmbH filed Critical Voith Sulzer Papiermaschinen GmbH
Publication of EP0889162A2 publication Critical patent/EP0889162A2/fr
Publication of EP0889162A3 publication Critical patent/EP0889162A3/fr
Application granted granted Critical
Publication of EP0889162B1 publication Critical patent/EP0889162B1/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
    • D21F1/04—Head boxes of cylinder machines
    • D21F1/046—Head boxes of cylinder machines with non-immersed cylinder

Definitions

  • the invention relates to a former with a screen, preferably is designed as a circular screen, between the screen and an upper lip formed by a current carrying wall adjustable outlet gap for fiber suspension emerging from a chamber is formed, and wherein the upper lip by means of a print medium can be fed in the direction of the screen is.
  • Such a former is known from DE 31 25 278 A1.
  • a sheet formation zone is formed in which the fiber suspension from a feed channel into a gap between a circular sieve and a current guide wall under pressure.
  • the beginning of the gap is between a lower lip and defines an upper lip, while at the end of the gap an exit gap between the sieve and the upper lip.
  • the upper lip consists of individual elements that are articulated are interconnected. For setting the outlet gap there is a fixed stop against which the Upper lip with the help of a hydraulically actuated bellows is deliverable.
  • the known arrangement has the disadvantage that the outlet gap is fixed by the fixed stop and is therefore a consequence various influencing parameters, such as a runout of the sieve, changes in the composition of the fiber suspension and the supply pressure, etc. changes in the Sheet thickness can result.
  • the upper lip can be with the Also move imperfections of the round screen so that the outlet gap remains relatively constant.
  • a former of similar construction is known from US-A-3 645 843.
  • the outlet gap is limited by an upper lip that fixed pivotably on its side facing the chamber is and on its side facing away from the chamber by means of a Print medium is deliverable in the direction of the screen.
  • the invention is therefore based on the object of an improved Create shaper where the drainage pressure is independent of variations in the various influencing parameters largely can be kept constant and a sensitive attitude the drainage pressure is made possible.
  • this object is achieved in a former according to the type mentioned solved in that the upper lip by means of the print medium both towards the screen and is adjustable in the opposite direction.
  • the drainage pressure can be independent be kept constant by the degree of grinding and non-roundness of the sieve can be compensated.
  • the two Pressure hoses preferably extend parallel to Web running direction in the axial direction of the former. However, too other geometrical arrangements of the pressure hoses conceivable.
  • the upper lip attached to a stiffening element that is on its first Is guided by means of the two pressure hoses and at his end second end is pivotally attached to the axis of rotation.
  • a stationary one fixable carrier provided, on the first, facing the screen Side with a spacer to the stiffening element a first pocket for receiving the first pressure hose is formed and on its second side facing away from the sieve with a bracket rigidly connected to the stiffening element a second pocket for receiving the second pressure hose is formed is.
  • This measure can be used in addition to the defined setting of the exit gap also the entry gap of the fiber suspension change the sheet thickness immediately to influence.
  • the chamber from which the fiber suspension in the inlet gap between Upper lip and lower lip emerge on the back of the sieve end facing away from a flexible wall is
  • an adjustable one Stop for the upper lip provided for a feed movement limit the upper lip towards the strainer.
  • the upper lip at its second end facing the chamber supported by means of a floating medium.
  • the upper lip is on its second end between at least two pressure hoses swimming led.
  • one of the Pressure hoses when the pressure medium is applied Force to move towards the screen and another the pressure hoses when the pressure medium is applied an opposite force.
  • the Pressure hoses extend parallel to the web running direction in the axial direction of the former.
  • the upper lip attached to a stiffening element, which in its first, end facing away from the channel and at its second end facing the channel End with the help of at least two pressure hoses guided and supported on a support.
  • the upper lip is on their second end across a variety of across the machine width distributed swivel bearings supported on a cross strut, with the help of two pairs running side by side Pressure hoses is supported on the stiffening element, which in Pockets between the cross strut and the stiffening element the side facing the sieve and in pockets between the Cross strut and rigidly connected to the stiffening element Support elements run on the side facing away from the sieve.
  • the stiffening element provided with a variety of stiffening ribs, which are uniform over the entire width of the former Distances are arranged and each have a pivot bearing assigned for support.
  • a further advantageous embodiment of the invention is between the first end of the stiffening element facing away from the chamber and one rigidly connected to a carrier Bracket a bag facing the sieve to hold a pressure hose formed and between the carrier and the stiffening element a pocket facing away from the sieve to hold a Pressure hose formed.
  • This measure has the advantage that a basic setting of the Distance between upper lip and stiffening element without prior Removal of the bracket is made possible.
  • Threaded spindle provided the support and the stiffening element interspersed and in a threaded portion of the stiffening element and the upper lip engages.
  • Threaded spindles can be provided.
  • a transverse distribution pipe is provided from liquids into the chamber, that is rigidly connected to the beam via struts is, and which can be tempered such that the carrier is free of deflection remains.
  • At least one displacement sensor for determining the position of the Upper lip at its first end and / or at its second end intended.
  • the displacement sensor can be used with the threaded spindle or with one of the Be pivot bearing coupled.
  • a former according to the invention is overall with the Number 10 denotes.
  • the former 10 comprises a forming roll, of which only the screen 12 in the area of the sheet formation zone is shown.
  • the fiber suspension emerges from a Chamber 26, which is also referred to as a mixing chamber, over an entry gap 20 which is between a lower lip 36 and an upper lip 16 is formed in a gap between the Sieve 12 and the upper lip 16, the upper end of an outlet gap 14 specifies.
  • the upper lip 16 with screw connections 39, 40, 41 above the pivot axis 22 and with screw connections 42 below the pivot axis 22 is attached to the stiffening element 18, that consist of a rectangular bracket can.
  • a stable support 50 with the base body 54 screwed.
  • a support wall 56 on the Sieve 12 facing away from the side, which is approximately isosceles V-shaped tub with an obtuse opening angle is that with both legs in the area of the lower end and in the region of the upper end of the carrier 50 on the latter is applied and to which further attachments are attached.
  • Fibrous suspension is fed into the mixing chamber 26 via numerous arranged next to each other across the width of the former 10 Lines 28 fed from below, into a side on the support wall 26 extending channel 34 via valves 32 and Dilution water pipes 30 that are at a certain angle open into the lines 28, dilution liquid supplied is so the pulp suspension in the desired mixing chamber Concentration for setting the desired area weight profile feed.
  • the mixing chamber 26 is on its rear, facing away from the screen 12 End through a flexible wall 38 in the form of a plastic lip sealed in a dovetail guide 37 is fixed to the base body 54 and in a groove 43 on the opposite Wall element is held. Through this flexible Sealing will be variations that result from a pivoting the upper lip 16 about the pivot axis 22, balanced.
  • the pivot axis 22 itself is through an adjustment device 24 adjustable by means of an adjusting spindle, so as to adjust the distance to be able to adjust the upper lip 16 from the lower lip 36, whereby the width of the inlet gap 20 is fixed.
  • a spacer 46 is provided, wherein between the carrier 52, the bracket 44 at the top and the spacer 46 a pocket 58 is formed, within which the first pressure hose 47 is included.
  • the first pressure hose 47 is supplied by a pressure source 61 a control device 60 pressurized during the second pressure hose 48 likewise from a pressure source 63 pressure is applied via a control device 62.
  • Air is preferably used as the pressure medium.
  • the outer pressure hose 48 becomes constant Pressure operated while the inner pressure hose 47 after is automatically controlled according to the respective operating conditions, to keep the drainage pressure in the outlet gap 14 constant.
  • the control device 62 of the outer pressure hose 48 is designed such that an emergency lifting of the upper lip 16 from Sieve 12 when an accident occurs, that is about when it occurs of coarse impurities in the fiber suspension, is made possible.
  • the size of the outlet gap 14 becomes normal during operation and the drainage pressure by the pressure difference between the two pressure hoses 47, 48 are defined.
  • a stop 65 is provided, which is only is indicated schematically by the number 65 and which is approximately by means of a threaded spindle is adjustable to a minimum Determine size of the outlet gap 14, up to which a pivoting the upper lip 16 in the direction of the sieve 12 maximally is possible.
  • Such a minimal size of the outlet gap should be used for standstill and for starting operation of the former are observed in order to avoid damage to the screen 12, if there is no drainage pressure yet.
  • FIG. 2 is a modified embodiment of an inventive Formers in total designated with the number 10a.
  • corresponding reference numbers are used for corresponding parts.
  • the former 10a comprises a forming roll, of which the screen 12 in Area of the sheet formation zone is shown.
  • the pulp suspension from a chamber 26, which is also called Mixing chamber is called, via an inlet gap 20, the formed between a lower lip 36 and an upper lip 16 is, between the sieve 12 and the upper lip 16, on upper end of an outlet gap 14 between the screen 12 and the upper lip 16 is set.
  • a carrier 50 which at its lower end with the Base body 54 is screwed. With the carrier 50 are also Support walls 56 and 57 connected on the side facing away from the screen 12, whereby an approximately V-shaped trough is formed, the with both legs in the area of the lower end and the upper End of the carrier 50 abuts this, and the other Attachments are attached.
  • Fibrous suspension is fed into the mixing chamber 26 via numerous arranged next to each other across the width of the former 10 Lines 28 fed from below, into a side channel or transverse distribution pipe 34 running on the supporting wall 57 via valves 32 and dilution water lines 30, which in one open at a certain angle into the lines 28, dilution liquid is supplied so as to section 26 of the chamber Fibrous suspension in the desired concentration for adjustment the desired area weight profile.
  • first pressure hose 47 At the upper end or first end 84 of the stiffening element 18 an approximately 44 L-shaped bracket 44 is screwed on, which projects outwards from the stiffening element 18 and engages around the upper end of the carrier 50.
  • an approximately 44 L-shaped bracket 44 is screwed on, which projects outwards from the stiffening element 18 and engages around the upper end of the carrier 50.
  • On the screen 12 facing Side of the carrier 50 is between the carrier 50 and the stiffening element 18 formed a pocket 58 inside a first pressure hose 47 is enclosed.
  • Both Pressure hoses 47, 48 can be from a pressure source 61, 63 via a control device 60, 62 with pressure, e.g. with compressed air, be charged.
  • the first end 84 of the stiffening element 18 is at the end the upper lip 16 connected via a threaded bolt 39 which in a threaded blind hole engages at the upper end of the upper lip 16. This allows a basic setting of the outlet gap 14 or make a desired profile across the web width preset.
  • the stiffening element 18 At the first end facing the chamber 26 is the stiffening element 18, with which the upper lip 16 through various screw connections 40, 41, 42 is connected via a variety of Swivel bearings 22 distributed over the web width, which via bolts 23 are connected to the stiffening element 18 with the help the pressure hoses 70, 71, 72, 73 supported on the carrier 50.
  • the bolts 23 are connected to a cross strut 86, which runs parallel to the beam 50 over the machine width.
  • a cross strut 86 which runs parallel to the beam 50 over the machine width.
  • Between the cross strut 86 and the carrier 50 are side by side two pockets 66 and 67 on the side facing the sieve 12 formed in which pressure hoses 70 and 71 run while on the side facing away from the screen 12 between the cross member 86 and a support element 74 connected to the carrier 50 Pockets 68, 69 are formed, in which pressure hoses in turn 72, 73 run.
  • the pressure hoses 70, 71 are off a pressure source 75 via a control device 76 with pressure acted upon, and the pressure hoses 72, 73 are made of the same Pressure source 75 can be pressurized via a control device 77.
  • the stiffening element 18 is in a variety of Vertical stiffening ribs 19 are provided, across the entire width of the machine at regular intervals of preferably about 30 cm are arranged. Any stiffening rib 19 is a pivot bearing 22 with a pin 23 for Support on the cross member 86 via the pressure hoses 70, 71, 72, 73 assigned.
  • FIG. 3 A modification of the embodiment according to FIG. 2 is shown in FIG. 3 and designated overall by the number 10b. Here corresponding reference numbers are used for corresponding parts.
  • the bracket 44 ' is in the reverse manner to that in the embodiment arranged according to FIG. 2.
  • the first end 84 'of the stiffening element 18 is namely between the pressure hoses 47, 48 guided, with a first pocket 47 between the bracket 44 'and the first end 84' of the stiffening element 18 and a second pocket 59 between the first end 84 ' of the stiffening element 18 and the carrier 50 is formed which the bracket 44 'is rigidly fixed, e.g. screwed to this is.
  • the threaded spindle 82 passes through the carrier 50, the first end 84 'of the stiffening element 18 and a threaded blind hole at the upper end of the upper lip 16.
  • the threaded spindle 82 is in a threaded section at the upper end 84 'of the stiffening element 18 and in the threaded blind hole at the top of the Upper lip 16 guided so that when the threaded spindle rotates 82 the distance between the upper lip 16 and the Stiffening element 18 can be adjusted. That way a presetting of the size of the outlet gap 14 is reached be the size of the outlet gap 14 across the web width to adapt to a desired profiling, for which the different Threaded spindles 82 distributed over the web width are adjusted can be.
  • the cross distribution pipe 34 supplied dilution water tempered in a suitable manner.

Landscapes

  • Paper (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
EP98108651A 1997-07-01 1998-05-13 Section de formage Expired - Lifetime EP0889162B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE1997127929 DE19727929A1 (de) 1997-07-01 1997-07-01 Former
DE19727929 1997-07-01
DE19748460A DE19748460A1 (de) 1997-07-01 1997-11-03 Former
DE19748460 1997-11-03

Publications (3)

Publication Number Publication Date
EP0889162A2 true EP0889162A2 (fr) 1999-01-07
EP0889162A3 EP0889162A3 (fr) 1999-06-16
EP0889162B1 EP0889162B1 (fr) 2003-12-10

Family

ID=26037904

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98108651A Expired - Lifetime EP0889162B1 (fr) 1997-07-01 1998-05-13 Section de formage

Country Status (4)

Country Link
US (1) US6139690A (fr)
EP (1) EP0889162B1 (fr)
AT (1) ATE256217T1 (fr)
DE (2) DE19748460A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004067837A1 (fr) * 2003-01-29 2004-08-12 Voith Paper Patent Gmbh Dispositif de formage
DE10323300A1 (de) * 2003-05-21 2004-12-16 Voith Paper Patent Gmbh Former

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008054634A1 (de) 2008-12-15 2010-06-17 Voith Patent Gmbh Formiereinheit, insbesondere Hochkonsistenz-Blattbildungseinheit, Verwendung und Verfahren zur Steuerung der Betriebsweise einer derartigen Formiereinheit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0106593A2 (fr) * 1982-10-11 1984-04-25 The Wiggins Teape Group Limited Dispositif de régulation pour buse
US4980026A (en) * 1988-10-22 1990-12-25 J. M. Voith Gmbh Headbox with movable duct wall
DE29508352U1 (de) * 1994-05-25 1995-07-27 Dörries GmbH, 52349 Düren Stoffauflauf für Papiermaschinen

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3645843A (en) * 1970-04-30 1972-02-29 Beloit Corp Fluid control of headbox slice opening
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
CH564640A5 (fr) * 1973-04-17 1975-07-31 Escher Wyss Gmbh
CH565280A5 (fr) * 1973-04-24 1975-08-15 Escher Wyss Gmbh
AT356505B (de) * 1977-07-27 1980-05-12 Escher Wyss Gmbh Stoffauflauf fuer papiermaschinen
SE404817B (sv) * 1978-02-21 1978-10-30 Uddeholms Ab Inloppslada for pappersmaskiner
AT369452B (de) * 1980-07-03 1983-01-10 Voith Ag J M Einrichtung zur verstellung bzw. einstellung des stoffauflaufes fuer siebmaschinen, insb. rundsiebmaschinen zur erzeugung eines vlieses aus einer stoffsuspension
US4358342A (en) * 1981-01-19 1982-11-09 Kimberly-Clark Corporation Papermaking headbox having rigid lips and actvating means

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0106593A2 (fr) * 1982-10-11 1984-04-25 The Wiggins Teape Group Limited Dispositif de régulation pour buse
US4980026A (en) * 1988-10-22 1990-12-25 J. M. Voith Gmbh Headbox with movable duct wall
DE29508352U1 (de) * 1994-05-25 1995-07-27 Dörries GmbH, 52349 Düren Stoffauflauf für Papiermaschinen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004067837A1 (fr) * 2003-01-29 2004-08-12 Voith Paper Patent Gmbh Dispositif de formage
DE10323300A1 (de) * 2003-05-21 2004-12-16 Voith Paper Patent Gmbh Former

Also Published As

Publication number Publication date
US6139690A (en) 2000-10-31
DE59810379D1 (de) 2004-01-22
ATE256217T1 (de) 2003-12-15
DE19748460A1 (de) 1999-05-06
EP0889162B1 (fr) 2003-12-10
EP0889162A3 (fr) 1999-06-16

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