EP0155465A1 - Wet press for dewatering a web material - Google Patents

Wet press for dewatering a web material Download PDF

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Publication number
EP0155465A1
EP0155465A1 EP85100814A EP85100814A EP0155465A1 EP 0155465 A1 EP0155465 A1 EP 0155465A1 EP 85100814 A EP85100814 A EP 85100814A EP 85100814 A EP85100814 A EP 85100814A EP 0155465 A1 EP0155465 A1 EP 0155465A1
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EP
European Patent Office
Prior art keywords
pressure
elements
row
pressing
pressing elements
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
EP85100814A
Other languages
German (de)
French (fr)
Other versions
EP0155465B1 (en
Inventor
Hans K. Dr.-Ing. Dahl
Herbert Dipl.-Ing. Holik
Rüdiger Dr.-Ing. Kurtz
Wolf-Gunter Ing. Fh Stotz
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
Sulzer Escher Wyss GmbH
Original Assignee
Sulzer Escher Wyss GmbH
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
Priority to CH533/84 priority Critical
Priority to CH53384 priority
Application filed by Sulzer Escher Wyss GmbH, Escher Wyss GmbH filed Critical Sulzer Escher Wyss GmbH
Publication of EP0155465A1 publication Critical patent/EP0155465A1/en
Application granted granted Critical
Publication of EP0155465B1 publication Critical patent/EP0155465B1/en
Expired legal-status Critical Current

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Classifications

    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00Press section of machines for making continuous webs of paper
    • D21F3/02Wet presses
    • D21F3/0209Wet presses with extended press nip
    • D21F3/0218Shoe presses

Abstract

In the case of a wet press for dewatering a web of material, for example a paper web, a pressing device (2) is provided which presses against a rotating roller (1) and exerts increasing pressure in the running direction of the paper web. For this purpose, several rows (16, 17) of pressing elements are provided one behind the other in the running direction of the paper web. In each row, the pressing elements are positioned close to one another transversely to the running direction of the paper web. To avoid a different drainage at the location of the pressing elements of a row and the gaps between the pressing elements of this row, the pressing elements of different rows (16, 17) are offset from one another transversely to the web and overlap. This prevents streaking of the resulting paper.

Description

  • 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 part of the circumference of the roller, the pressing device having at least two pressing elements in the running direction of the web, which exert an increasing pressure in the direction of travel of the material web.
  • Such wet presses are described for example in US Pat. No. 3,783,097 or DE 31 05 276 and are used for dewatering e.g. a paper or cardboard web or another fiber material, the web being passed 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 plurality of pressing elements which are arranged one behind the other in the running direction of the web. In order to achieve good drainage, the pressure of the pressure elements lying behind one another increases in the running direction up to a maximum value and is then reduced as quickly as possible to zero in order to avoid rewetting.
  • The pressing elements can be designed as pressure bars extending over the entire width of the web. If the roller deflects during operation, however, it is not guaranteed that the contact pressure Apply the same pressure across the entire width of the web. It may also be desirable to vary the pressure on the web across the width of the web. With pressing elements that are designed as continuous strips over the entire width, however, this is only possible with great difficulty. In order to be able to set a pressure that is uniform over the width or a desired pressure profile, it is therefore necessary to divide the pressure elements into a number of pressure elements that are arranged next to one another in a row transverse to the running direction of the web. Even if the individual printing elements are arranged close to each other across the width, a pressure drop inevitably arises at the borders between two adjacent printing elements, which leads to uneven drainage across the width of the web and, for example, results in streakiness of the paper produced, which is not or hardly tolerable in practice.
  • The invention sets itself the task of avoiding the above-mentioned disadvantages of previously known wet presses and, in particular, of creating a wet press in which a uniform drainage of a web can be achieved over its entire width, in which a uniform pressure or a desired pressure profile can be achieved over the entire width and in which disruptive and undesirable effects of a deflection of the roller during operation are avoided, but an increasing contact pressure in the running direction of the web is maintained.
  • According to the invention, this object is achieved in that the pressing device consists of at least two rows of pressing elements one behind the other in the running direction, with several pressing elements being arranged next to one another in each row transversely to the running direction of the material web in such a way that the pressing elements of one row are opposite the pressing members of another row are offset from each other.
  • The division of the pressing elements of each zone into several pressure elements lying next to each other allows the pressing pressure to be adapted to a deflection of the roller. A streakiness of the web or the paper is avoided by the staggered arrangement of the individual printing elements of different rows. Since the successive rows of pressure elements exert an increasing pressing pressure, the advantages of dewatering with successively increasing pressure are retained.
  • The individual pressure elements can advantageously be designed as hydrostatic pressure elements which have a piston which can be moved in the pressing direction in a pressure chamber supplied with pressure medium and which carries a pressure element provided with pressure pockets, the pressure pockets being connected to the pressure chamber via channels. In this way, a uniform pressing pressure of all pressure elements over the entire width can be ensured in a particularly simple manner, or a desired pressure profile can be set.
  • The invention is explained in more detail using the exemplary embodiments shown in the figures.
    • Figure 1 shows a wet press in longitudinal section.
    • Figure 2 shows a first pressing device in the plan.
    • Figure 3 shows a further pressure device in the supervision.
    • Figure 4 shows a pressure device with common control in cross section.
    • Figure 5 shows another pressing device in cross section.
  • 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-tight pressing belt 5 in a press nip 6 is guided along part A of the roller circumference. During the passage of the paper web 3 through this press nip 6, 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. If necessary, 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, as shown in FIG. 1, as a deflection compensation roller or as a deflection adjustment roller, the roller consisting of a rotating roller jacket 7 and a fixed support 8 and both parts by pressing elements movable in the pressing direction 9 are supported against each other so that the deflection of the roller can be controlled. The pressing elements can be designed in any known manner. Hydrostatic pressure elements, as described for example in QS 3 802 044, have proven to be particularly favorable, a number of such pressure elements being arranged next to one another in the axial direction of the roller, that is to say transversely to the paper web.
  • The pressure belt 5 can be designed as an endless belt and runs over several guide rollers 10 with the paper web 3 and the felt belt 4 through the press nip 6 be designed in the form of a roller shell, so that guide rollers can be dispensed with. However, sufficient flexibility of this roll shell must be ensured.
  • The pressing device 2 consists of a cross member 11 which has two rows of pressure chambers 12 and 13, one behind the other in the running direction, which are supplied with a suitable pressure medium via lines 14 and 15. In these pressure chambers 12 and 13, pressing elements 16 and 17 are used in the transverse direction, which are pressed against the roller 1 by the pressure prevailing in the cylindrical pressure chambers 12 and 13 and dewater the paper web 3 by their contact pressure. As such, these pressing elements 16, 17 can be designed in any suitable form, but the embodiment as hydrostatic pressure elements according to US Pat. No. 3,802,044, which have pressure pockets 19 and 20 on their pressing surface, with bores 21 with the pressure spaces, has proven to be particularly advantageous 12 or 13 are connected. The contact pressure of the contact elements 16, 17 is selected so that the contact pressure increases successively in the running direction of the paper web, ie the contact pressure of the contact element 17 is greater than that of the contact element 16. This can be achieved in various ways, for example by the fact that the pressure in the cylindrical pressure chamber 13 is greater than that in the pressure chamber 12, that the cross-section of the bores 21 of the A npresselemente 16 and 17 is different or that the effective pressure area of the pressing elements 17 is smaller than the effective pressure surface 19 of the pressing elements 16, or that the cross sections of the Pressure spaces 13 of the pressing elements 17 are larger than those of the pressing elements 16. If necessary, a combination of the measures mentioned is also possible.
  • It should be noted that not only two rows of pressing elements can be provided, as shown in FIG. 1, but also a larger number of pressing element rows is possible, the contact pressure increasing successively from row to row in the running direction of the paper web until it follows the last row of pressure elements suddenly drops. The individual rows of pressing elements are expediently to be provided as closely as possible in order to prevent rewetting of the paper web between the individual rows of pressing elements. In this way, a particularly good drainage of a material web is achieved by using a successively increasing contact pressure.
  • In Figure 2, the pressing device 2 shown above in section is shown in plan view. Two rows 16 and 17 of pressing elements are provided one behind the other in the running direction, the individual pressing elements of each row 16 and 17 being arranged closely together in the transverse direction, so that only narrow gaps 22 and 23 are present between adjacent pressing elements. In order to achieve a contact pressure that increases in the direction of travel, the effective pressure area of the pressure pockets 20 of the rear row of pressure elements 17 as seen in the direction of travel is somewhat smaller than the effective pressure area of the pressure pockets 19 of the front row 16.
  • Viewed in the transverse direction, the pressure applied in each row of pressure elements between the individual adjacent pressure elements 16 and 17 drops, so that the drainage in the unavoidable gaps between the individual pressure elements is less than in the area of the pressure pockets 19 and 20 usually results in a certain undesirable streakiness of the paper produced in this way. To this ef To avoid the pressure, the pressure elements 16 and 17 of the two rows are offset from one another and overlap one another. The columns 22 of the rear row 17 are thus in the running direction at the points where there are 16 pressure pockets 19 in the front row, and vice versa the gaps 23 between the pressing elements of the front row 16 are provided precisely at the points where there are 17 pressure pockets 20 in the rear row.
  • Figure 3 shows a top view of a pressing device in which three rows of pressing elements 16, 17 and 18 are provided. Instead of one pressure pocket, as in the previous example, these pressure elements have two pressure pockets 24 and 25, which improves the transverse stability. In the running direction, too, the individual pressing elements can have several pressure pockets in a row to improve stability, which are connected to the same pressure chamber with separate bores. Again, the pressing elements of the individual rows are arranged close to each other in the transverse direction, so that only narrow gaps 26, 27 and 28 arise between the individual pressing elements. Again, these columns 26, 27 and 28 are offset from one another in such a way that the pressing elements of the different rows overlap. In addition, the contact pressure in the running direction increases from row to row, i.e. it gradually increases from row 16 of pressing elements to row 17 and 18. In this way, i.e. With three or even with a larger number of rows of pressing elements, an even better uniformity of the resulting paper can be achieved, with the larger number of rows of pressing elements increasing the contact pressure in finer stages, which reduces the risk of damage to the paper web due to pressing .
  • FIG. 4 shows a pressing device 2 in cross-section, a number of pressing elements 16 being provided next to each other in the transverse carrier 11 in the transverse direction, which are movable in the pressing direction in cylindrical pressure chambers 12. The individual pressure chambers 12 are connected to a pressure medium source by means of a common line 14 and are thus supplied with pressure medium with the same pressure. In this way it is achieved that the contact pressure in the transverse direction is constant along the rows of contact elements.
  • As shown in FIG. 5, however, it can also be expedient to connect the individual pressing elements to different lines 14 1 , 14 2 ... To 14 6 and to supply them with a pressure medium of different pressure. Several pressure rooms can also be connected in groups to a single line, so that the pressure is controlled in zones. In this way, a certain pressure profile and a corresponding moisture profile of the resulting paper web can be set in the transverse direction along the row of pressing elements, which may be desirable under certain circumstances.
  • It is noted that the invention is not restricted to the exemplary embodiments described. Modifications within the scope of the inventive idea are possible. Thus, in the sense of the invention, a roller is not only to be understood as a relatively rigid solid roller or a more or less rigid hollow roller which is supported on the inside by supporting elements of any design or by rollers, but also a relatively flexible or band-shaped one, also on the inside suitably supported roller jacket. The surface of the pressing elements or pressure pockets can also advantageously be diamond-shaped or parallelogram-shaped, instead of square or rectangular, which can further improve the uniformity of the web.

Claims (10)

1. Wet press for dewatering a web (3) with a rotating roller (1) and a pressing device (2), between which the web (3) together with at least one water-absorbing belt (4) in a press nip (6) along part of the Roller circumference (A) is guided, the pressing device (2) in the running direction of the web (3) having at least two pressing elements (16, 17), which exert an increasing pressure in the running direction of the web, characterized in that the pressing device (2) There are at least two rows (16, 17, 18) of pressing elements one behind the other in the running direction, with several pressing elements being arranged next to one another in each row transversely to the running direction of the web so that the pressing elements of one row (16) are opposite the pressing elements of another row (17) are offset from each other.
2. Wet press according to claim 1, characterized in that between the water-absorbing belt (4) and the pressing device (2) a flexible, water-impermeable, endless belt (5) is guided.
3. Wet press according to claim 2, characterized in that the flexible, water-impermeable belt (5) is guided over deflection rollers (10).
4. Wet press according to one of claims 1-3, characterized in that the pressing elements (16, 17) are designed as hydrostatic support elements which in a cylinder supplied with pressure medium See pressure chamber (12, 13) are movable in the pressing direction and have at least one pressure pocket (19, 20) on their contact surface, which is connected to the cylindrical pressure chamber by a bore (21).
5 . Wet press according to claim 4, characterized in that the pressure of the pressure medium in the cylindrical pressure spaces (13) or the cross section of the bores (21) of a row of pressure elements (17) is greater than the pressure or the cross section in the cylindrical pressure spaces (12 ) of the pressing elements (16) of the row of pressing elements preceding in the running direction.
6. Wet press according to claim 4, characterized in that the pressure area of the pressure pockets (20) of the pressure elements (17) of a row of pressure elements is smaller than the pressure area of the pressure elements (16) of the row of pressure elements preceding in the running direction.
7. Wet press according to claim 4, characterized in that the cylindrical pressure spaces (13) of the pressing elements (17) of a row have a larger cross section than the corresponding pressure spaces (12) of the pressing elements (16) of the previous row in the running direction.
8. Wet press according to one of claims 1-7, characterized in that in the running direction of the web (3) more than two rows (16, 17, 18) of pressing elements are provided, the gaps between the pressing elements of a row transverse to Goods web have a different position from all the gaps between the pressing elements of all other rows.
9. Wet press according to one of claims 1-8, characterized in that the cylindrical pressure chambers (12) of the pressing elements (6) of a row (16) are connected to a common pressure line (14).
10. Wet press according to one of claims 1-8, characterized in that the pressure chambers (12) of the pressing elements (16) of a row are connected to different pressure medium lines (14 1 ... 14 6 ).
EP85100814A 1984-02-06 1985-01-26 Wet press for dewatering a web material Expired EP0155465B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CH533/84 1984-02-06
CH53384 1984-02-06

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT85100814T AT31097T (en) 1984-02-06 1985-01-26 Wet press for draining a track of goods.

Publications (2)

Publication Number Publication Date
EP0155465A1 true EP0155465A1 (en) 1985-09-25
EP0155465B1 EP0155465B1 (en) 1987-11-25

Family

ID=4189195

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85100814A Expired EP0155465B1 (en) 1984-02-06 1985-01-26 Wet press for dewatering a web material

Country Status (6)

Country Link
US (1) US4556454A (en)
EP (1) EP0155465B1 (en)
AT (1) AT31097T (en)
CA (1) CA1234307A (en)
DE (2) DE3408119C2 (en)
FI (1) FI850164L (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991000389A1 (en) * 1989-06-23 1991-01-10 Beloit Corporation A heated extended nip press apparatus
WO1991005913A1 (en) * 1989-10-11 1991-05-02 Sulzer-Escher Wyss Gmbh Calender

Families Citing this family (32)

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Publication number Priority date Publication date Assignee Title
CH670217A5 (en) * 1986-06-20 1989-05-31 Escher Wyss Gmbh
AT71701T (en) * 1986-09-03 1992-02-15 Kleinewefers Gmbh Deforming control roller.
DE3705241C2 (en) * 1986-12-24 1992-01-16 Sulzer-Escher Wyss Gmbh, 7980 Ravensburg, De
FI76872C (en) * 1987-02-23 1988-12-12 Valmet Paper Machinery Inc Method and apparatus for controlling zone rollers.
SE461171C (en) * 1988-05-25 1992-05-15 Valmet Paper Machinery Inc Press with laangt pinch Foer paper or board machines
SE461154B (en) * 1988-05-25 1990-01-15 Valmet Paper Machinery Inc Press with laangt pinch Foer paper or board machines
US5140897A (en) * 1989-08-09 1992-08-25 Beloit Corporation Extended nip press apparatus
FI91789C (en) * 1989-12-21 1994-08-10 Tampella Oy Ab Paper machine long zone press
US5389205A (en) * 1990-11-23 1995-02-14 Valmet Paper Machinery, Inc. Method for dewatering of a paper web by pressing using an extended nip shoe pre-press zone on the forming wire
US5639351A (en) * 1991-12-23 1997-06-17 Valmet Corporation Press section of a paper machine, in particular for printing paper qualities
FI98844C (en) * 1991-12-23 1997-08-25 Valmet Paper Machinery Inc Press section in paper machine, especially for printing paper grades
DE4319323A1 (en) * 1993-06-11 1993-11-04 Voith Gmbh J M Paper-making press section - has units to reduce pressure at web edges to ends of the press shoe to eliminate pressure peaks
DE4409316C1 (en) * 1994-03-18 1995-06-29 Escher Wyss Gmbh Long gap press assembly for fibre web
FI942616A (en) * 1994-06-03 1995-12-04 Valmet Corp Paper web pre-press
DE4423694C2 (en) * 1994-07-06 2000-03-16 Voith Sulzer Papiermasch Gmbh Long nip press
DE4430268C1 (en) * 1994-08-26 1995-11-02 Kleinewefers Gmbh Roller with buckling control allows fine adjustment over greater range
DE19520443C2 (en) * 1995-06-03 2000-05-31 Voith Sulzer Papiermasch Gmbh Roller press
DE19522761C2 (en) * 1995-06-27 2000-11-16 Voith Sulzer Papiermasch Gmbh Shoe press device
DE19544978C2 (en) * 1995-12-01 1998-07-30 Voith Sulzer Papiermasch Gmbh Press roll
DE19613878C1 (en) * 1996-04-06 1997-06-12 Voith Sulzer Finishing Gmbh Calender for paper, having two treatment points
US5709778A (en) * 1996-10-30 1998-01-20 Voith Sulzer Paper Technology North America, Inc. Multiple shoe press for a paper making machine
US6875085B2 (en) * 1998-11-06 2005-04-05 Mosel Vitelic, Inc. Polishing system including a hydrostatic fluid bearing support
DE19756422A1 (en) * 1997-12-18 1999-06-24 Voith Sulzer Papiertech Patent Machine for producing a fibrous web, in particular a tissue paper web
DE19941336A1 (en) * 1999-08-31 2001-03-01 Voith Paper Patent Gmbh Drying device
DE10032251A1 (en) * 2000-07-03 2002-01-17 Voith Paper Patent Gmbh Water extraction station for a web of tissue/toilet paper has a shoe press unit at the drying cylinder with an extended press gap and a suction unit within an overpressure hood at the carrier belt
US7101587B2 (en) 2001-07-06 2006-09-05 Kimberly-Clark Worldwide, Inc. Method for wetting and winding a substrate
US6649262B2 (en) 2001-07-06 2003-11-18 Kimberly-Clark Worldwide, Inc. Wet roll having uniform composition distribution
US6866220B2 (en) 2001-12-21 2005-03-15 Kimberly-Clark Worldwide, Inc. Continuous motion coreless roll winder
JP4779564B2 (en) * 2005-10-18 2011-09-28 王子製紙株式会社 Shoe press apparatus for paper machine and paper manufacturing method
US7767060B2 (en) * 2006-03-22 2010-08-03 E. I. Du Pont De Nemours And Company Creping machine
WO2014026914A1 (en) * 2012-08-15 2014-02-20 Voith Patent Gmbh Sealing device, suction roll and method for producing and/or processing a paper, cardboard or tissue web
ITFI20130106A1 (en) * 2013-05-09 2014-11-10 Toscotec S P A Press shoe.

Citations (3)

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DE2262201A1 (en) * 1971-12-20 1973-07-05 Beloit Corp to squeeze Press of water from a continuous moving fiber material web
US3970515A (en) * 1973-11-05 1976-07-20 Beloit Corporation Controlled sequence pressure nip
DE3126492A1 (en) * 1981-06-30 1983-01-20 Escher Wyss Ag Press roll

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DE2230139B2 (en) * 1971-06-28 1980-01-31 Escher Wyss Ag, Zuerich (Schweiz)
US3783097A (en) * 1972-05-30 1974-01-01 Beloit Corp Hydrodynamically loaded web press with slipper bearing shoes
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AT380907B (en) * 1981-01-27 1986-07-25 Escher Wyss Gmbh Wet press with extended press split for paper machines
FI71979B (en) * 1981-06-24 1986-11-28 Escher Wyss Ag Pressvals

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
DE2262201A1 (en) * 1971-12-20 1973-07-05 Beloit Corp to squeeze Press of water from a continuous moving fiber material web
US3970515A (en) * 1973-11-05 1976-07-20 Beloit Corporation Controlled sequence pressure nip
DE3126492A1 (en) * 1981-06-30 1983-01-20 Escher Wyss Ag Press roll

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991000389A1 (en) * 1989-06-23 1991-01-10 Beloit Corporation A heated extended nip press apparatus
WO1991005913A1 (en) * 1989-10-11 1991-05-02 Sulzer-Escher Wyss Gmbh Calender

Also Published As

Publication number Publication date
FI850164D0 (en)
FI850164A0 (en) 1985-01-15
FI850164A (en)
DE3408119C2 (en) 1987-06-19
US4556454A (en) 1985-12-03
CA1234307A1 (en)
DE3408119A1 (en) 1985-08-14
CA1234307A (en) 1988-03-22
FI850164L (en) 1985-08-07
DE3561077D1 (en) 1988-01-07
EP0155465B1 (en) 1987-11-25
AT31097T (en) 1987-12-15

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