EP0496965B1 - Pressenpartie - Google Patents

Pressenpartie Download PDF

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Publication number
EP0496965B1
EP0496965B1 EP91119700A EP91119700A EP0496965B1 EP 0496965 B1 EP0496965 B1 EP 0496965B1 EP 91119700 A EP91119700 A EP 91119700A EP 91119700 A EP91119700 A EP 91119700A EP 0496965 B1 EP0496965 B1 EP 0496965B1
Authority
EP
European Patent Office
Prior art keywords
press
nip
web
roll
belt
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 - Lifetime
Application number
EP91119700A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0496965A1 (de
Inventor
Christian Schiel
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.)
JM Voith GmbH
Original Assignee
JM Voith 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 JM Voith GmbH filed Critical JM Voith GmbH
Publication of EP0496965A1 publication Critical patent/EP0496965A1/de
Application granted granted Critical
Publication of EP0496965B1 publication Critical patent/EP0496965B1/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
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses
    • D21F3/0227—Belts or sleeves therefor
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/04—Arrangements thereof
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/04—Arrangements thereof
    • D21F3/045—Arrangements thereof including at least one extended press nip

Definitions

  • the invention relates to a press section of a machine for producing a fibrous web, in particular paper web, with the features a) to d) of claim 1, which are known from US Pat. No. 4,359,827.
  • the known press section is formed from a roll set of four (or five) rolls with a central roll 50 which forms a first and a second press nip 14 and 17 with two (or three) pressure rolls.
  • a press belt 15 runs through these two press nips, where it runs onto the central roll 50 in front of the first press nip 14 and runs behind the second press nip 17 from the central roll.
  • a first endless felt belt 12 guides the web W to be dewatered from the wire section first through a pre-press nip 13 and from this into the first press nip 14. Immediately behind this first press nip 14, the first felt belt 12 is separated from the web W. From this point, the press belt 15 guides the web W around the central roller 50 (with an additional press nip 16 possibly being passed) into the second press nip 17 and behind it to a take-off point at which a dryer fabric 19 takes over the web with the help of a take-off suction roll 18 transferred to a dryer section.
  • the author of the US-PS pursues, among other things, the goal of creating a paper machine in which there is nowhere a free paper draw between the wire section and dryer section, in particular also in the press section. This is to avoid weakening the web (which is still wet and therefore has little strength) in a free paper draw.
  • the author of the US-PS thus expects that higher working speeds, fewer paper breaks and the use of cheaper raw materials will be possible.
  • a disadvantage of the known press section according to US Pat. No. 4,359,827 is that it is difficult to detach the web behind the second press nip 17 from the press belt and to transfer it safely to the dryer fabric 19.
  • US Pat. No. 4,483,745 also describes various press sections in which a non-porous, water-impermeable and smooth surface press belt runs together with the web to be dewatered through one or two press nips.
  • a non-porous, water-impermeable and smooth surface press belt runs together with the web to be dewatered through one or two press nips.
  • U.S. Patent 4,359,827 the same problems arise with detachment of the web from the press belt as with the subject of U.S. Patent 4,359,827.
  • the risk of paper web tears is to be reduced and the economy of paper production is thereby improved.
  • dryer fabric usually: dryer fabric
  • the distance from the second press nip to the point where the web is removed from the substantially water-impermeable press belt is to be increased considerably compared to heretofore. (For preferred dimensions, see claim 2.)
  • the visco-elastic and previously flat-pressed fibers can partially straighten up again; this reduces the proportion of contact between the fibers and the smooth surface of the press belt.
  • the resistance to removal also decreases, so that the web can now be removed from the smooth surface of the press belt with a substantially lower tensile stress, that is to say much more gently than before.
  • the considerably increased distance from the second press nip to the removal point is combined with the feature that the two pressure rollers (or at least the first pressure roller) are designed as long-nip pressure rollers known per se.
  • This combination is based on the knowledge that the considerable distance of the take-off point from the second press nip makes it possible to let the press belt serving as the web conveyor belt run in succession through two so-called extended press nips. After an extended press nip through which the web runs in contact with a press belt, it is particularly difficult to detach the web from the press belt because the web comes into particularly intimate contact with the press belt due to the long dwell time in the press nip.
  • the so-called recovery time becomes longer; this is the time in which (after the web has emerged from the press nip) the previously flat-pressed fibers (as explained above) partially straighten up again, so that the joint proportion of contact between the press belt and the web becomes smaller.
  • the press nip length is, for example, three times larger than in a press nip formed by two normal rollers, a triple recovery time is also necessary in order to be able to detach the web sufficiently easily from the press belt. It has now been shown, however, that the above-described effect of the prolonged dwell time of the web on the press belt (behind the last press nip) also enables the web to be removed from the press belt flawlessly when it comes to extended press nips.
  • rollers have a flexible, tubular and hermetically sealed (and thus inflatable) press jacket at both ends. This is pressed against the central roller by means of a non-rotating press shoe which can be moved in the radial direction and which has a concave sliding surface.
  • a roller is therefore self-pressing, ie its bearing blocks and the bearing blocks of the cooperating roller (namely the central roller) do not have to be displaced radially to one another.
  • shoe press rolls allow a considerable increase in the working speed, because the extended press nips and the thus extended press time considerably increase the dewatering capacity of the press section.
  • the paper web thus leaves the press section with a relatively high dry content, so that less water has to be evaporated in the subsequent dryer section.
  • Another advantage of the extended press nips is that relatively thin and finely woven felt belts can be used in the press section; this contributes to improving the quality of the finished paper web.
  • Figure 1 shows schematically a press section according to the invention in side view.
  • FIG. 2 shows details of FIG. 1 on an enlarged scale.
  • FIG. 3 shows schematically the cross-sectional shapes of the press shoes of the long-nip press rolls.
  • FIG. 4 is a partial section through the press belt along line IV of FIG. 3.
  • the main part of the press section shown in FIG. 1 is a roller set with a central roller O, which forms two press nips I and II with a first pressure roller 11 and with a second pressure roller 12.
  • An essentially water-impermeable endless press belt 8 runs over the central roller O and thus successively through the two press nips I and II, and also over belt guide rollers 15, 15 '.
  • the press belt runs in front of the first press nip I on the central roll O and leaves it again behind the second press nip II.
  • the paper web formed in a wire section 3 (indicated by a dotted line) is fed with the aid of a first endless felt belt 1 via a take-off suction roll 4 and fed to the first press nip I via suction guide rolls 5 and 6.
  • the suction guide roller 6 lying at a distance in front of the first press nip I is arranged such that first the felt belt 1 guiding the web and then the press belt 8 run up. From here, the web runs between felt belt 1 and press belt 8 to the first press nip I.
  • the first felt belt 1 separates from the web and from the press belt 8 and runs via felt guide rollers 7 back to the take-off suction roll 4.
  • the web sticks to the press belt 8 and runs with it around the central roller O into the second press nip II In many (but not all) applications, this runs through a second endless felt belt 2, which separates from the web and from the pressing belt 8 behind the second press nip II.
  • the felt belt 2 and the press belt 8 form an acute angle, which in most cases is less than 10 °. Outside the press nip II, the second felt belt 2 runs over felt guide rollers 18 and 18 '.
  • the hardness of the roll shell of the second pressure roller 12 should be lower than the hardness of the web side of the press belt 8, so that the web continues to run behind the second press nip II with the press belt 8. In order to achieve the highest possible dry content of the web and the highest possible running speeds, however, it will generally not be possible to do without the second felt belt.
  • the belt guide rollers 15 and 15 'of the press belt 8 are arranged such that the press belt 8 bridges a relatively large distance from the central roller O to the area of the first drying cylinder 14 of the dryer section following the press section.
  • the press belt 8 leads the web from the second press nip II to a take-off point 9; there it is transferred to a drying wire 13 by means of a take-off suction roll 10 and then runs with it in a known manner over the drying cylinders 14 and over further suction guide rolls 10 '.
  • the length of the path of the press belt 8 from the second press nip II to the take-off point 9 is at least equal to the circumference of the central roller O; however, this length is preferably 2 to 3 times, sometimes even 3 to 5 times the circumference of the central roller O.
  • the suction guide roll 5 can (in a reinforced form) together with a (preferably grooved) press roll 17 form a pre-press nip V through which an additional felt belt 16 runs, guided by felt guide rolls 19.
  • a double felt press preceding the press nips I and II the dewatering capacity of the press section can be increased even further.
  • a heating device 25 e.g. with heat radiators and / or warm air nozzles
  • a heating device 25 can be provided in order to heat and pre-dry the web.
  • the axes of the central roller O and the pressure rollers 11 and 12 lie in a vertically arranged press plane E.
  • the press plane E could also be inclined by up to 10 °, namely to the right in FIG. 1.
  • the two suction guide rollers 5 and 6 could be combined into a single roller.
  • the running direction of the press belt 8 through the first press nip I is opposite to the general machine direction; because on the way from the first to the second press nip the direction of the press belt 8 is reversed and then corresponds to the general machine direction.
  • the first press nip I below the second press nip II This arrangement is preferred because it causes the web on the subsequent path to the take-off point 9 on the upper side of the press belt 8. The reverse arrangement is also conceivable.
  • the press belt 8 can be guided on the way from the second press nip II to the take-off point 9 via an articulated roller 15 'which deflects the press belt 8 from a predominantly horizontal direction into a downward inclined direction.
  • FIGS. 2 and 3 again show the central roller O and the two pressure rollers 11 and 12.
  • the latter are designed as long-nip pressure rollers; that is, they have a flexible tubular press jacket 26, 27, the ends of which are hermetically sealed in a known manner by means of a rotating disk, not shown. This means that lubricant cannot escape and compressed air can be applied to the interior.
  • a stationary support body 28 or 29 extends through the interior of each extended-nip press roll.
  • a press shoe 30 or 31 which extends over the entire width of the web, has a concave sliding surface and is hydraulically displaceable in the radial direction . As a result, he can press the press jacket 26 or 27 against the central roller O.
  • the two press shoes 30 and 31 are shaped differently; ie the effective width b1 of the pressure shoe 30 of the first pressure roller 11 during pressing is greater than the effective width b2 of the pressure shoe 31 of the second pressure roller 12 during pressing.
  • the width B of the piston part of the two pressure shoes 30 and 31 is the same; thus the two support bodies 28 and 29 are shaped substantially the same.
  • the pressure chambers used to actuate the pressure shoes 30, 31 are preferably also subjected to approximately the same pressures.
  • largely identical line pressures are generated in both press nips I and II, so that they are on the central roller O at least approximately cancel out the acting line forces (apart from their own weight).
  • the central roller O can thereby be designed as a simple roller stored in normal bearings; ie it need not be designed as a roller with adjustable deflection. Nevertheless, the pressing pressure generated per unit area is lower in the first press nip I than in the second press nip II. A relatively gentle, but long-lasting dewatering of the paper web is achieved in the first press nip I, in contrast, in the second press nip II, more intensive dewatering, but of shorter duration. (Alternative: support body and press shoe, e.g. 29 and 31, could be replaced by a rotatable roller body).
  • the bearing housing 35 and the two bearing blocks 36 and 37 are positively connected, that is to say completely rigidly connected to one another. During normal operation, therefore, none of the bearing housings 35 or bearing blocks 36, 37 are moved. To apply the pressing forces, the radial displacement of the press shoes 30 and 31 is sufficient.
  • the two columns 41 and 42 can be removed to replace the felt belts 1 and 2, the press belt 8 or the press sleeves 26, 27. To replace the press sleeves 26, 27, the intermediate piece 38 or the tension elements 39 must also be removed.
  • the columns 41, 42 can also be connected to the stationary machine frame 40, as is indicated by way of example at 43.
  • the press belt 8 runs together with the felt belt 1 (and together with the paper web in between) at a point W on the Central roller O, which is located at a certain distance before entering the first press nip I. This causes the press belt 8 and felt 1 to lie snugly against the central roller O before the press jacket 26 comes into contact with the felt 1. Behind the first press nip I, the first felt belt 1 leaves the central roller O at a point X which lies at a certain distance behind the outlet from the press nip I.
  • the contact point Y of the second felt belt 2 on the central roll O is also at a certain distance from the entry into the second press nip II.
  • the press belt 8 runs from the central roll O at a point Z which is at a distance behind the second press nip II.
  • the second felt belt 2 forms an angle a of between 5 and 15 ° with the press belt 8. This angle depends, among other things. of the paper type and can be varied by vertically adjusting the guide roller 18 '(Fig. 1).
  • the press belt 8 is preferably made of a pourable and hardened plastic (for example polyurethane) with a reinforcement, for example in the form of a fabric or in accordance with FIG. 4 in the form of threads 44, for example in accordance with WO 88/08897 (file P 4378).
  • the hardness of the plastic (at least in the area of the web-side surface 45) is normally in the range between 80 and 95 Shore A.
  • the press belt 8 has a smooth and water-impermeable web-side surface 45 and a thickness of approximately 2.5 to 5 mm.
  • the surface 46 of the press belt facing the central roller O can also be smooth; however, it is preferably provided with recesses 47 for the temporary storage of water.
  • the recesses 47 can be designed as blind bores or as circumferential grooves or can be formed by a reinforcing fabric that partially protrudes from the plastic material.

Landscapes

  • Paper (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
EP91119700A 1991-01-26 1991-11-19 Pressenpartie Expired - Lifetime EP0496965B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4102356 1991-01-26
DE4102356A DE4102356C1 (ru) 1991-01-26 1991-01-26

Publications (2)

Publication Number Publication Date
EP0496965A1 EP0496965A1 (de) 1992-08-05
EP0496965B1 true EP0496965B1 (de) 1995-04-19

Family

ID=6423803

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91119700A Expired - Lifetime EP0496965B1 (de) 1991-01-26 1991-11-19 Pressenpartie

Country Status (8)

Country Link
US (1) US5256257A (ru)
EP (1) EP0496965B1 (ru)
JP (1) JPH0544189A (ru)
AT (1) ATE121475T1 (ru)
CA (1) CA2059870C (ru)
DE (2) DE4102356C1 (ru)
ES (1) ES2071892T3 (ru)
FI (1) FI920082A (ru)

Families Citing this family (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4140879A1 (de) * 1991-12-11 1993-06-17 Voith Gmbh J M Pressenpartie
US5393383A (en) * 1991-12-19 1995-02-28 Valmet Paper Machinery Inc. Compact press section with closed draw of the web in a paper machine
FI916026A (fi) * 1991-12-19 1993-06-20 Valmet Paper Machinery Inc Kompakt pressparti med slutet bandrag i en pappersmaskin
US5611892A (en) * 1991-12-19 1997-03-18 Valmet Corporation Compact press section in a paper machine
DE4222034A1 (de) * 1992-07-04 1994-01-05 Voith Gmbh J M Trennung des Randstreifens einer Papierbahn in der Pressenpartie vom wasserundurchlässigen Band
ATE151132T1 (de) * 1993-01-23 1997-04-15 Voith Gmbh J M Nasspresse für eine papiermaschine
FI102623B1 (fi) * 1995-10-04 1999-01-15 Valmet Corp Menetelmä ja laite paperikoneessa
US6004430A (en) * 1995-10-04 1999-12-21 Ilvespaa; Heikki Method and device for enhancing the run of a paper web in a paper machine
US5700356A (en) * 1996-01-19 1997-12-23 Lefkowitz; Leonard R. Air permeable belt for dewatering web in press nip
US5891308A (en) * 1996-02-02 1999-04-06 Beloit Technologies, Inc. Method of pressing a paper web of tropical hardwood fibers
FI110440B (fi) * 1996-04-04 2003-01-31 Metso Paper Inc Rainan siirto paperikoneen kaksihuopaisesta viimeisestä puristinnipistä seuraavalle kuivatusosalle
US5766422A (en) * 1996-08-01 1998-06-16 Beloit Technologies, Inc. Lightweight high temperature pressing
DE19633422A1 (de) * 1996-08-20 1998-02-26 Voith Sulzer Papiermasch Gmbh Pressenpartie und Verfahren zum Entwässern einer wässrigen Faserstoffbahn
DE19642046A1 (de) * 1996-10-11 1998-04-16 Voith Sulzer Papiermasch Gmbh Pressenpartie
DE19652018A1 (de) 1996-12-13 1998-06-18 Voith Sulzer Papiermasch Gmbh Pressenpartie
DE19654197A1 (de) * 1996-12-23 1998-06-25 Voith Sulzer Papiermasch Gmbh Maschine zur Herstellung einer Faserstoffbahn
US6294052B1 (en) * 1997-06-18 2001-09-25 Jose J. Garcia B. Efficient press section for paper manufacturing
DE19904576A1 (de) * 1999-02-04 2000-08-10 Voith Sulzer Papiertech Patent Pressenanordnung
FI112873B (fi) * 1999-03-12 2004-01-30 Metso Paper Inc Menetelmä ja sovitelma paperi- ja kartonkirainan käsittelemiseksi
FI116401B (fi) 2000-02-22 2005-11-15 Metso Paper Inc Paperi- tai kartonkikone, jossa on muodostusosa ja puristinosa
US7008528B2 (en) * 2001-03-22 2006-03-07 Mitchell Allen R Process and system for continuously extracting oil from solid or liquid oil bearing material
US6485612B1 (en) * 2001-05-18 2002-11-26 Voith Paper, Inc. Air press assembly for use in a paper-making machine
FI124698B (fi) * 2004-01-15 2014-12-15 Valmet Technologies Inc Sovitelma paperikoneessa
DE102005000046A1 (de) * 2005-04-28 2006-11-02 Voith Patent Gmbh Maschine zur Herstellung einer Faserstoffbahn
US7468117B2 (en) * 2005-04-29 2008-12-23 Kimberly-Clark Worldwide, Inc. Method of transferring a wet tissue web to a three-dimensional fabric
KR101483167B1 (ko) * 2006-10-27 2015-01-16 발멧 에이비 제지 장치의 불침투성 이송 벨트를 구비한 장치와, 관련 방법
DE102007055876A1 (de) * 2007-12-19 2009-06-25 Voith Patent Gmbh Verfahren zum bahnbreiten Überführen einer Faserstoffbahn in einer Maschine zur Herstellung von Faserstoffbahnen und Maschine zur Herstellung einer Faserstoffbahn
WO2009129843A1 (en) 2008-04-21 2009-10-29 Metso Paper, Inc. Press and dryer section in a web forming machine
DE112008003815T5 (de) 2008-04-21 2011-03-24 Metso Paper, Inc. Pressenpartie einer Bahnbildungsmaschine
AT508331B1 (de) * 2009-05-19 2011-05-15 Andritz Ag Maschf Verfahren und vorrichtung zur behandlung einer faserstoffbahn in einer langnip-presseinheit

Family Cites Families (13)

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Publication number Priority date Publication date Assignee Title
US3861997A (en) * 1972-12-21 1975-01-21 Beloit Corp Paper machine press arrangement with stacked press rolls
US4359827B1 (en) * 1979-11-05 1994-03-29 Keith V Thomas High speed paper drying
FI81854C (fi) * 1982-09-15 1990-12-10 Valmet Oy Pressparti med separata pressnyp i en pappersmaskin.
US4483745A (en) * 1982-09-29 1984-11-20 Beloit Corporation Method and apparatus of sheet transfer using a nonporous smooth surfaced belt
FI70950C (fi) * 1983-03-25 1986-10-27 Valmet Oy Pressparti med slutet drag i pappersmaskin
FI842114A (fi) * 1984-05-25 1985-11-26 Valmet Oy Pressparti med separata presszon i en pappersmaskin.
DE3715153A1 (de) * 1987-05-07 1988-12-01 Voith Gmbh J M Verstaerkter pressmantel fuer eine presseinrichtung zur behandlung bahnfoermigen gutes, wie z. b. von papierbahnen, sowie verfahren und vorrichtung zu seiner herstellung
JPS6414717U (ru) * 1987-07-15 1989-01-25
US4880502A (en) * 1987-08-11 1989-11-14 Beloit Corporation Press drying apparatus with deflection control and blow box cooling
US4790908A (en) * 1988-02-19 1988-12-13 Beloit Corporation Extended nip press belt guide and method
DE3809526A1 (de) * 1988-03-22 1989-10-12 Aigster Josef Verfahren und anordnung zum verbessern des arbeitsverhaltens der nasspresse einer papiermaschine
US5002638A (en) * 1988-06-13 1991-03-26 Appleton Mills Papermaking machine in which the paper web is supported in the draw between the press and dryer sections
JPH02269893A (ja) * 1989-04-11 1990-11-05 Mitsubishi Heavy Ind Ltd 抄紙機のプレス装置

Also Published As

Publication number Publication date
FI920082A0 (fi) 1992-01-08
JPH0544189A (ja) 1993-02-23
DE4102356C1 (ru) 1992-01-23
ES2071892T3 (es) 1995-07-01
FI920082A (fi) 1992-07-27
DE59105267D1 (de) 1995-05-24
US5256257A (en) 1993-10-26
ATE121475T1 (de) 1995-05-15
EP0496965A1 (de) 1992-08-05
CA2059870C (en) 1996-04-02

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