EP0151447B1 - Nasspresse zum Entwässern einer Warenbahn - Google Patents

Nasspresse zum Entwässern einer Warenbahn Download PDF

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Publication number
EP0151447B1
EP0151447B1 EP85100815A EP85100815A EP0151447B1 EP 0151447 B1 EP0151447 B1 EP 0151447B1 EP 85100815 A EP85100815 A EP 85100815A EP 85100815 A EP85100815 A EP 85100815A EP 0151447 B1 EP0151447 B1 EP 0151447B1
Authority
EP
European Patent Office
Prior art keywords
pressure
running direction
pockets
wet press
plunger
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
EP85100815A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0151447A2 (de
EP0151447A3 (en
Inventor
Peter Dipl.-Ing. Heitmann
Herbert Dipl.-Ing. Holik
Peter Dipl.-Ing. Mirsberger
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 AT85100815T priority Critical patent/ATE37572T1/de
Publication of EP0151447A2 publication Critical patent/EP0151447A2/de
Publication of EP0151447A3 publication Critical patent/EP0151447A3/de
Application granted granted Critical
Publication of EP0151447B1 publication Critical patent/EP0151447B1/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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/20—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using rotary pressing members, other than worms or screws, e.g. rollers, rings, discs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/22—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using a flexible member, e.g. diaphragm, urged by fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/24—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using an endless pressing band
    • B30B9/241—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using an endless pressing band co-operating with a drum or roller

Definitions

  • the invention relates to a wet press for dewatering a web with a rotating roller and a pressing device, between which the web is guided together with at least one water-absorbing belt in a press nip along a part of the circumference of the roll, the pressing device having a hydrostatic pressure element, which in the pressing direction Movable support shoe, which has at least two pressure pockets one behind the other in the direction of the web in the press nip, which are connected to channels with a common pressure chamber supplied with pressure medium.
  • Such wet presses are known for example from DE-A-2 313 920 and are used for dewatering, e.g. B. a paper or cardboard web or other fiber material, the web being guided together with, for example, a water-absorbing felt belt and a water-impermeable press belt through a press nip which is formed by a roller and a hydrostatic pressure element.
  • a press nip which is formed by a roller and a hydrostatic pressure element.
  • even pressure is achieved in the press nip over a certain length of the web in the running direction, so that the drainage of the web to be pressed is significantly better than with wet presses with two rollers acting only in one line transverse to the web.
  • the drainage performance is not yet optimal, since the contact pressure in the press nip remains almost constant over the entire length.
  • the invention has for its object to avoid the above-mentioned disadvantages of known wet presses and in particular to provide a wet press in which improved drainage of a web can be achieved without the need for complicated control of a plurality of printing elements and avoiding a plurality of such printing elements in the running direction, whereby nevertheless, dewatering with successively increasing contact pressure and minimal rewetting is achieved with the least possible effort.
  • the pressing device has a piston which is movable relative to the pressure chamber and which is arranged asymmetrically relative to the support shoe in such a way that the area of the pressure pockets, viewed in the direction of travel of the web, is larger than the area of the piston in front of the central axis of the piston Pressure pockets behind the central axis of the piston.
  • cross section of the pressure pockets provided one behind the other in the running direction of the web has a decreasing pressing surface and / or that the associated channels have an increasing cross section.
  • the invention is based on the knowledge that due to the asymmetrical geometric design of the pressure element, in particular the asymmetrical arrangement of the piston, supported by the different design of the pressure pockets and channels, to counteract a tilting moment due to the efforts of the pressure element to counteract in the pressure pockets Set different pressures in operation, although all pressure pockets are connected to the same pressure chamber via the communicating channels.
  • the wet press shown in FIG. 1 consists of a roller 1 and a pressing device 2, between which the material web, for example a paper web 3 together with a water-absorbing belt 4, for example a felt belt and a flexible, water-impermeable jacket 5, into a press nip 6 is guided along part A of the roller circumference.
  • the material web for example a paper web 3 together with a water-absorbing belt 4, for example a felt belt and a flexible, water-impermeable jacket 5, into a press nip 6 is guided along part A of the roller circumference.
  • the paper web is dewatered with a successively increasing pressing pressure, the water emerging from the paper web 3 being absorbed by the felt belt 4.
  • additional belts for example a wire belt, can also be passed through the press nip.
  • the roller 1 can be designed as a solid, tube or suction roller, or also as a deflection compensation roller, as described for example in US-A-3 802 044, or as a relatively flexible, band-shaped roller jacket suitably supported on the inside.
  • the water-impermeable jacket 5 can be designed as a flexible roller jacket without guide rollers or as an endless rubber band which, if necessary, is guided over several guide rollers 8, 9, 10. In any case, sufficient flexibility and adaptability to the surface of the roller 1 in the press nip 6 must be ensured.
  • the pressing device 2 consists of one or more hydrostatic pressure elements 11 which are arranged next to one another transversely to the direction of travel and which can be designed, for example, analogously to US Pat.
  • the pistons 20 of these pressure elements are movable in cylindrical or groove-shaped pressure spaces 12 of a cross member 13 in the pressing direction P and can be inclined to a certain extent against the pressing direction, so that the support shoes 30 of the pressure elements on the counter surface, i. H. the roller surface are customizable.
  • the pressure chamber 12 is connected to a line 14 and is connected via this with a suitable pressure medium, for. B. oil or water, supplied with a certain pressure.
  • the support shoes 30 of the pressure elements 11 have a plurality of bearing pockets on their pressing surface, for example two bearing pockets 15 and 16 one behind the other in the running direction L.
  • the effective pressure surface of the inlet-side bearing pocket 15 can be larger than the effective pressure surface of the outlet-side pressure pocket 16.
  • Both pressure pockets 15 and 16 are connected via channels to the common pressure chamber 12, namely the inlet-side pressure pocket 15 by means of a channel 17 with a smaller cross-section and the outlet-side pressure pocket 16 with a channel 18 with a larger cross-section.
  • the piston 20 of the pressure element is arranged asymmetrically relative to the support shoe 30 carried by it, in such a way that the effective pressure surface lying in front of the central axis M of the piston 20 in the running direction L, i. H. essentially the pressure area of the pressure pocket 15 is larger than the effective pressure area lying behind the central axis M of the piston 20, i. H. essentially the printing area of the pressure pocket 16.
  • the described design of the printing elements 11 ensures that, during operation, a higher pressure is set in the printing pocket 16 than in the printing pocket 15, although both printing pockets are in communication with the common pressure chamber 12, so that an improved drainage of the paper web 3 is achieved successively increasing pressure is made possible. Only a single pressing element is required in the running direction, and no separate control devices are required for the pressure pockets provided one behind the other in the running direction. In the asymmetrical pressure elements described, a pressing pressure that gradually increases in the running direction is automatically set.
  • the gap which arises during operation between the pressure surface of the pressure element and the counter surface along the circumference of the pressure surface will be of different sizes, i. H. the gap on the inlet side will have a different value than on the outlet side.
  • the size of this gap is usually such that the amount of pressure medium flowing out of the gap from the pressure pockets corresponds to the quantity of pressure medium that is subsequently supplied from the pressure space via the channels into the pressure pockets.
  • the cross sections of the channels will be adapted to the geometry of the printing pockets 15 or 16 in such a way that the gap is the same over the entire circumference of the printing surface of the printing element.
  • Such an adaptation of the ducts to the associated pressure pockets can be done either by calculation or by observing the gap widths that practically arise and changing the duct cross-sections accordingly.
  • the pressure medium not only flows out of the pressure pockets 15 and 16 into the outside area, but since a pressure difference arises in both pressure pockets, there is a tendency for pressure medium to flow over from the pressure pocket 16 with higher pressure into the pressure pocket 15 with lower pressure.
  • slots can be provided on the pressing surface of the pressure element between the pressure pockets 15 and 16, which are connected to a pressure medium drain line 19.
  • the pressure element 11 in the running direction L can also have more than two pressure pockets in succession, for example three pressure pockets 21, 22 and 23 with successively increasing pressure.
  • the effective printing area in the three printing pockets gradually decreases in the running direction L.
  • the three pressure pockets are connected to channels 24, 24 and 26, the cross section of which gradually increases in the running direction L.
  • the support surface 30 is again arranged and formed asymmetrically to the central axis M of the piston 20.
  • Figure 3 shows the pressing surface of a pressing device in the plan.
  • a certain number of pressure pockets are arranged side by side in two rows 15 and 16 transversely to the running direction L.
  • the piston strip 20 is arranged asymmetrically to the pressing surface, the pressure surface of the pressure pockets 15 on the inlet side is larger than that of the pressure pockets 16 on the outlet side, and the cross section of the associated channels 17 of the pressure pockets on the inlet side is smaller than that of the channels 18 of the pressure pockets 16 on the outlet side.
  • the number of pressure pockets in the two rows 15 and 16 can be different, for example as shown, the inlet-side pressure pockets 15 can be made wider than the outlet-side pressure pockets 16. It is only important that the pressure pockets relative to the piston have the above have given asymmetry.
  • the pressing device can also consist of several individual printing elements 27 1 ... 27 5 arranged side by side transversely to the running direction L.
  • the pressing surface of the printing elements as is the rule, difficulties arise, however, in that gaps are necessarily present between the individual printing elements, which cause a pressure drop between the individual printing elements.
  • Such a drop in pressure inevitably arises at the borders of two adjacent pressure elements even if they are packed close to one another across the width. This leads to uneven drainage across the width of the web and, for example, to an undesirable streakiness of the paper produced.
  • the columns 28 1 ... 28 4 run at an acute angle, ie obliquely to the running direction L.
  • the pressing surfaces of the individual pressure elements 27 1 ... 27 5 are designed as parallelograms. Of course, another design can also be provided, only it must be ensured that the gaps do not run continuously parallel to the running direction L. In any case, this ensures that all zones are treated and dewatered transversely to the paper web with sufficient pressing pressure, thereby avoiding streakiness of the paper produced.
  • the pressing device can have a support shoe 30 which is designed as a continuous bar, but which is carried instead of a piston bar by a plurality of separate pistons 20 1 , 20 2 , 20 3 , each belonging to a plurality of pressure pockets, e.g. B. in FIG. 6 two different pressure pockets 15, 16.
  • the pressure pockets are arranged asymmetrically with respect to the center M of the piston, so that a successively increasing pressing pressure is also achieved in this case.
  • the piston is firmly connected to the support shoe and is movable together with it in a fixed pressure chamber
  • the piston can also be fixed and connected to the cross member, while the pressure chamber is closed off by a cap on the back of the support shoe which cap contains the connecting channels to the bearing pockets and whose extension forms a sleeve which is movable relative to the piston.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)
EP85100815A 1984-02-06 1985-01-26 Nasspresse zum Entwässern einer Warenbahn Expired EP0151447B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85100815T ATE37572T1 (de) 1984-02-06 1985-01-26 Nasspresse zum entwaessern einer warenbahn.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH534/84 1984-02-06
CH53484 1984-02-06

Publications (3)

Publication Number Publication Date
EP0151447A2 EP0151447A2 (de) 1985-08-14
EP0151447A3 EP0151447A3 (en) 1985-09-25
EP0151447B1 true EP0151447B1 (de) 1988-09-28

Family

ID=4189220

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85100815A Expired EP0151447B1 (de) 1984-02-06 1985-01-26 Nasspresse zum Entwässern einer Warenbahn

Country Status (9)

Country Link
US (1) US4661206A (ja)
EP (1) EP0151447B1 (ja)
JP (1) JPS60181394A (ja)
AR (1) AR241605A1 (ja)
AT (1) ATE37572T1 (ja)
CA (1) CA1234306A (ja)
DE (2) DE3408118A1 (ja)
ES (1) ES8601761A1 (ja)
FI (1) FI81151C (ja)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI73301C (fi) * 1986-05-30 1987-09-10 Valmet Oy Stoedarrangemang foer glidskorna av en zonreglerbar boejningskompenserad vals.
CH670217A5 (ja) * 1986-06-20 1989-05-31 Escher Wyss Gmbh
ATE71701T1 (de) * 1986-09-03 1992-02-15 Kleinewefers Gmbh Deformationsregelwalze.
DE3705241A1 (de) * 1986-12-24 1988-07-07 Escher Wyss Gmbh Verfahren zur mechanisch-thermischen entwaesserung einer faserstoffbahn
DE3728124A1 (de) * 1987-08-22 1989-03-02 Escher Wyss Gmbh Entwaesserungspresse mit dampfzufuhr
DE3815278A1 (de) * 1988-05-05 1989-11-16 Voith Gmbh J M Pressenpartie einer maschine zur herstellung einer faserstoffbahn, insbesondere papierbahn
SE461154B (sv) * 1988-05-25 1990-01-15 Valmet Paper Machinery Inc Press med laangt nyp foer pappers- eller kartongmaskiner
US4973384A (en) * 1989-06-23 1990-11-27 Beloit Corporation Heated extended nip press apparatus
DE4017433A1 (de) * 1989-10-11 1991-04-25 Escher Wyss Gmbh Walzenpresse
FI91789C (fi) * 1989-12-21 1994-08-10 Tampella Oy Ab Paperikoneen pitkävyöhykepuristin
DE4125470C2 (de) * 1991-08-01 1995-10-12 Voith Gmbh J M Schuhpresse zum Entwässern einer Faserstoff-Bahn
DE4138788C2 (de) * 1991-11-26 1995-05-18 Escher Wyss Gmbh Vorrichtung zur Entwässerung einer Faserstoffbahn
SE469600B (sv) * 1991-12-23 1993-08-02 Valmet Karlstad Ab Trycksko
DE4407405C2 (de) * 1994-03-05 2000-03-16 Voith Sulzer Papiermasch Gmbh Trockenpartie
FI100264B (fi) * 1994-08-04 1997-10-31 Valmet Corp Kenkäkuormitettu taipumakompensoitu tela
US5650048A (en) * 1996-01-31 1997-07-22 Beloit Technologies, Inc. Extended nip press with hydraulic pressure equalizer valve
DE19613878C1 (de) * 1996-04-06 1997-06-12 Voith Sulzer Finishing Gmbh Kalander für Papier o. dgl.
SE511203C2 (sv) * 1997-10-14 1999-08-23 Valmet Corp Långnypspress samt långnypspressko till densamma
US6875085B2 (en) * 1998-11-06 2005-04-05 Mosel Vitelic, Inc. Polishing system including a hydrostatic fluid bearing support
US7767060B2 (en) * 2006-03-22 2010-08-03 E. I. Du Pont De Nemours And Company Creping machine
CN111270546B (zh) * 2020-03-18 2021-09-14 泰兴市中亚烘干设备制造有限公司 一种立式浸胶烘干设备用烘干机构

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2230139B2 (de) * 1971-06-28 1980-01-31 Escher Wyss Ag, Zuerich (Schweiz) Walze mit Durchbiegungsausgleich für die Druckbehandlung von bahnförmigen Materialien
US3783097A (en) * 1972-05-30 1974-01-01 Beloit Corp Hydrodynamically loaded web press with slipper bearing shoes
CH563867A5 (ja) * 1973-03-01 1975-07-15 Escher Wyss Gmbh
US3970515A (en) * 1973-11-05 1976-07-20 Beloit Corporation Controlled sequence pressure nip
CH587688A5 (ja) * 1975-02-13 1977-05-13 Escher Wyss Ag
AT360831B (de) * 1977-12-20 1981-02-10 Escher Wyss Ag Hydraulisches stuetzelement
US4201624A (en) * 1978-09-05 1980-05-06 Beloit Corporation Extended nip press
US4427492A (en) * 1981-05-26 1984-01-24 Beloit Corporation Extended nip shoe for a nip in a papermaking machine
FI71979B (fi) * 1981-06-24 1986-11-28 Escher Wyss Ag Pressvals
DE3126492C2 (de) * 1981-06-30 1983-10-20 Escher Wyss AG, Zürich Preßwalze
DE3224007C2 (de) * 1982-06-26 1985-05-23 J.M. Voith Gmbh, 7920 Heidenheim Walzenpresse mit verlängertem Preßspalt
FI833133A (fi) * 1982-09-30 1984-03-31 Beloit Corp Press med foerlaengt nyp
JPS60106744A (ja) * 1983-11-15 1985-06-12 Kiyoto Uchida 薄板状体搬送機構

Also Published As

Publication number Publication date
FI81151B (fi) 1990-05-31
JPS60181394A (ja) 1985-09-17
FI850213A0 (fi) 1985-01-17
CA1234306A (en) 1988-03-22
AR241605A1 (es) 1992-09-30
DE3408118C2 (ja) 1988-01-28
DE3408118A1 (de) 1985-08-14
FI81151C (fi) 1990-09-10
JPH0583676B2 (ja) 1993-11-29
US4661206A (en) 1987-04-28
EP0151447A2 (de) 1985-08-14
ES540150A0 (es) 1985-11-16
FI850213L (fi) 1985-08-07
ATE37572T1 (de) 1988-10-15
DE3565292D1 (en) 1988-11-03
EP0151447A3 (en) 1985-09-25
ES8601761A1 (es) 1985-11-16

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