EP0401190B1 - Presspartie an Papier- oder Kartonmaschine - Google Patents

Presspartie an Papier- oder Kartonmaschine Download PDF

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Publication number
EP0401190B1
EP0401190B1 EP90850218A EP90850218A EP0401190B1 EP 0401190 B1 EP0401190 B1 EP 0401190B1 EP 90850218 A EP90850218 A EP 90850218A EP 90850218 A EP90850218 A EP 90850218A EP 0401190 B1 EP0401190 B1 EP 0401190B1
Authority
EP
European Patent Office
Prior art keywords
roll
press
nip
centre
crown
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
EP90850218A
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English (en)
French (fr)
Other versions
EP0401190A2 (de
EP0401190A3 (de
Inventor
Seppo Tavi
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.)
Valmet Paper Machinery Inc
Original Assignee
Valmet Paper Machinery Inc
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 Valmet Paper Machinery Inc filed Critical Valmet Paper Machinery Inc
Publication of EP0401190A2 publication Critical patent/EP0401190A2/de
Publication of EP0401190A3 publication Critical patent/EP0401190A3/de
Application granted granted Critical
Publication of EP0401190B1 publication Critical patent/EP0401190B1/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
    • D21F3/04—Arrangements thereof

Definitions

  • the invention concerns a press section of a paper or board machine, comprising a number of rolls which form press nips that dewater the web with each other, the web being arranged to run through said nips, and of which said rolls at least one roll is a smooth-faced so-called centre roll, which forms a press nip with at least one other press roll, over which a press felt, which has been formed as an endless loop, is passed to absorb water out of the web into said press felt.
  • a press section is disclosed in DE-A-3 117 787.
  • a web is formed in the former of the paper machine, whereupon the formed web is passed, being supported and carried by the felts in the paper machine, into the press section of the paper machine, wherein both the web and the felts that support it are passed through nips formed by the rolls in the press section to absorb water out of the web into the felts. From the press section the web is passed further into the drying section of the paper machine.
  • a conventional solution in a press section comprises a large and massive centre roll as well as wire or felt loops grouped around it, the rolls placed inside said loops forming press nips either with one another or together with the centre roll, and when the web runs through said press nips, water is drained out of the web by the effect of compression, said water being absorbed into the felts.
  • water is removed out of the web by means of evaporation, which is highly energy-consuming and therefore expensive and uneconomical. This is why attempts are made to remove a maximal proportion of water out of the web before the drying section, in the press section, by mechanical means.
  • a conventional construction in the press section of a paper machine wherein a centre roll and press rolls grouped around it are employed constitutes three press nips.
  • the first press nip is formed between a grooved roll and a press-suction roll.
  • the second press nips is formed between a press-suction roll and the centre roll
  • the third press nip is formed between the centre roll and a second grooved roll. Since, in the nips in the press section, it must be possible to make the linear loads as uniform as possible, in such a solution, as a rule, said grooved rolls have been formed as variable-crown rolls, preferably as rolls adjustable in zones.
  • the object of the present invention is to provide a press section by means of which the drawbacks described above are minimized and by means of which an essential improvement is obtained in respect of increased dry solids content and increased running speed.
  • a further object is to provide a construction to substitute for the rock rolls employed in presses.
  • the centre roll is a variable-crown roll, which comprises a metallic roll mantle arranged revolving on a stationary roll axle as well as at least one set of crown-variation means, which are arranged to load the roll mantle in the direction of the nip plane of the centre roll and the roll that forms a press nip with said centre roll so asto regulate the profile of linear load in said nip.
  • variable-crown rolls can be substituted for by one variable-crown roll.
  • crown-variation means are used expressly in connection with the centre roll, it is considerably easier to construct these means in the interior of the roll, because the available space is larger.
  • the mantle of the centre roll can be made thinner than in prior art, whereby it has an improved thermal conductivity.
  • the roll can also be used for heating the web.
  • An additional advantage obtainable by means of the invention is related to the construction of the grooved rolls that are used to-day.
  • the grooved rolls are made so that they are provided with a suitable coating, e.g. of polyurethane. It results from this that they have a limited ability to tolerate heat.
  • Variable-crown rolls and in particular rolls adjustable in zones, however, develop a considerable amount of heat. Since, when a solution in accordance with the invention is used, the grooved rolls do not have to be variable-crown rolls, if necessary, they can be provided with cooling in a simple way. As a further, additional advantage can be stated that the invention can be applied as such as an after-installation to existing presses. The further advantages and characteristic features of the invention come out from the following detailed description of the invention, and further embodiments of the invention are claimed in Claims 2 to 5.
  • Figure 1 is a schematical side view of the press section of a paper or board machine wherein a solution of the invention is applied.
  • Figure 2 is a corresponding view of an embodiment alternative of the solution shown in Fig. 1.
  • Figure 3 is a corresponding view of a further embodiment alternative of the solutions shown in Figs. 1 and 2.
  • FIG. 4 shows a further alternative embodiment of the solution in accordance with the invention.
  • the web W in is formed on the wire 50, which is either a fourdrinier wire or the carrying wire of a twin-wire former.
  • the wire 50 On the downwards inclined run of the wire 50 between the wire suction roll 51 and the wire draw roll 52, the web W is transferred on the detaching line P on the suction zone 14 of the pick-up roll 13 onto the first press felt 10, which, thus, also acts as the pick-up felt.
  • the first press felt 10 carries the web W on its lower face into the first press nip N1, which is formed between two press rolls, i.e. a press-suction roll 11 and a grooved roll 22 or an equivalent roll provided with a hollow face 23.
  • the first press felt 10 forms an endless loop by means of guide and alignment rolls (not shown), which also keep said first press felt 10 appropriately tensioned.
  • the first nip N1 is provided with two press felts, i.e. said first press felt 10 and a second press felt 20, the latter felt also forming an endless loop by means of guide and alignment rolls 21, which keep said second press felt 20 appropriately tensioned.
  • the nip plane of the first nip N1 is denoted with the reference denotation K1.
  • the web W is sucked by means of the suction zone 12 of the press-suction roll 11 out of contact with the second press felt 20 onto the face of the first press felt 10 and, being guided by the press-suction roll 11, into the second nip N2.
  • a so-called pick-up felt is used as said first press felt, and the press-suction roll is provided with a suction zone 12 of appropriate length, which ensures the detaching of the web W from the second press felt 20 onto the face of the first press felt 10.
  • the second nip N2 is formed between the press-suction roll 11 and the centre roll 1 in the press section. After the second nip N2, said first press felt 10 is passed away from the centre roll 1.
  • the web W is detached after the second nip N2 from the first press felt 10 and adheres to the face of said centre roll, under whose guidance the web W is hereupon transferred into the third nip N3 in the press section.
  • the third nip N3 is formed between the centre roll 1 and an opposite grooved roll 32 or an equivalent roll provided with a hollow face 33. Over said grooved roll 32, a third press felt 30 is passed, which is formed as an endless loop by means of guide and alignment rolls 31.
  • the press section further includes a fourth, separate press, in which case the fourth nip N4 in the press is formed between a second centre roll 70, corresponding to the centre roll 1, and an opposite grooved roll 44 or an equivalent roll provided with a hollow face 45.
  • the third nip N3 the web W is detached from the third press felt 30 onto the face of the centre roll 1, from which it is detached by means of a transfer-suction roll 63.
  • a transfer-suction roll 63 an open draw is formed between the centre roll 1 and said transfer-suction roll 63.
  • the web W is transferred onto the fourth press felt 40 on the suction zone 42 of the suction roll 41, which acts as a pick-up roll.
  • the fourth press felt 40 is also a so-called pick-up felt.
  • the fourth press felt 40 is formed as an endless loop by. means of guide and alignment rolls 43. Said fourth press felt 40 transfers the web W into the fourth press nip N4, after which, owing to the surface properties of the second centre roll 70, the web W is detached from the fourth press felt 40 onto the face of the second centre roll 70.
  • the nip plane of the fourth nip N4 is denoted with the reference denotation K4. From the second centre roll 70, the web W is transferred onto the drying wire 60 by means of transfer-suction rolls 61 and 62, while the drying wire 60 transfers the web W further into the drying section (not shown).
  • Fig. 1 shows a first preferred embodiment of a press section in accordance with the invention.
  • the centre roll 1 in the press section is a variable-crown roll, which comprises a metallic roll mantle 2 which is arranged as revolving on a stationary roll axle 3.
  • crown-variation means 4 and 5 are fitted which act in the nip plane K2 of the second nip N2 as well as in the nip plane K3 of the third nip N3, by means of which said means the roll mantle 2 is loaded in said nip planes K2 and K3 to produce the desired profile of linear load.
  • Fig. 1 shows a first preferred embodiment of a press section in accordance with the invention.
  • the centre roll 1 in the press section is a variable-crown roll, which comprises a metallic roll mantle 2 which is arranged as revolving on a stationary roll axle 3.
  • crown-variation means 4 and 5 are fitted which act in the nip plane K2 of the second
  • said crown-variation means comprise loading shoes supported on the roll axle 3 and acting upon the inner face of the roll mantle 2.
  • the centre roll 1 is a roll adjustable in zones, wherein the crown variation is provided in two directions, which form an angle ⁇ with each other.
  • regulation of the profile of linear loads is accomplished both in the second and in the third nip N2 and N3 in the press section. Since, in the centre roll in accordance with Fig. 1, there are two directions of crown variation, as the crown-variation means 4 and 5 it is necessary to employ exactly the above loading-shoe constructions.
  • crown variation were provided in the centre roll 1 in one direction only, either in the nip plane K2 of the second nip N2 or in the nip plane K3 of the third nip N3, in this direction it would be possible to employ any crown-variation means accomplished by means of the present-day technique as the crown-variation means.
  • Fig. 1 this has not been shown, but, if necessary, it would also be possible to provide crown-variation means in the grooved roll 22, in which case the profile of linear loads could also be brought under control in the first part N1 of the press section.
  • the press section shown in Fig. 1 also includes a fourth press nip N4 constituted by a separate press.
  • the second centre roll 70 is arranged as a variable-crown roll, so that the second centre roll 70 comprises a hollow, metallic roll mantle 71, which is arranged revolving on a stationary roll axle 72.
  • crown-variation means 73 are provided, by whose means the fourth nip N4 is loaded in the direction of the nip plane K4 to produce the desired profile of linear loads.
  • the second embodiment of the invention shown in Fig. 2 differs from that shown in Fig. 1 in the respect that, in the centre roll 1, crown-variation means 4 are provided in the nip plane K2 of the second nip N2 only. Owing to this, in the embodiment shown in Fig. 2, as crown-variation means 4 it is possible to use any construction whatsoever that can be accomplished by means of the present-day technique. In Fig. 2, it is shown additionally that in this embodiment the profile of linear loads is also regulated in the first nip N1 in the direction of the nip plane K1 so that the grooved roll 22 is formed as a variable-crown roll.
  • the grooved roll 22 comprises a tubular roll mantle 24, which is mounted as revolving on the stationary roll axle 25.
  • the necessary crown-variation means 26 are provided inside the roll mantle 24, to regulate the profile of linear loads in the nip N1. Since herein one direction of regulation only is concerned, as crown-variation means it is possible to use any regulation means that can be accomplished, e.g., by means of the present-day technique.
  • the grooved roll 32 in said third nip N3 is formed as a variable-crown roll, whose construction corresponds to that of the grooved roll 22 in the first nip N1 described above.
  • the grooved roll 32 comprises a tubular roll mantle 34, which is arranged revolving on the roll axle 35.
  • crown-variation means 36 are provided, which act in the nip plane K3 of the third nip N3 to regulate the profile of linear loads.
  • the crown-variation means 36 can be accomplished in any desired way.
  • the crown-variation means 36 it is possible to employ, for example, the loading shoes shown in Fig. 2, but in their place it is also possible to use, for example, a chamber of pressure fluid or a series of chambers provided between the roll axle 35 and the roll mantle 34.
  • the regulation of the profile of linear loads is arranged in a way differing from Fig. 1.
  • the embodiment shown in Fig. 1 In the embodiment shown in Fig.
  • the grooved roll 44 in the fourth nip N4 is arranged as a variable-crown roll so that the roll 44 comprises a tubular roll mantle 46, which is arranged revolving on the axle 47 of the roll mantle.
  • crown-variation means 48 similar to those described above in connection with the crown-variation means 26 and 36 of the grooved rolls 22 and 32 in the first nip N1 and in the third nip N3 are provided.
  • a fully conventional metal roll or even a rock roll as the centre roll 70.
  • the third embodiment of the invention is in a way a combination of the embodiments shown in Figs. 1 and 2.
  • the regulations of the profiles of linear loads in the first, second and third nip N1,N2,N3 in the press section are accomplished in the same ways as in the solution shown in Fig. 2, and in the fourth nip N4 in the same way as is shown in Fig. 1.
  • the embodiment shown in Fig. 4 differs from the above embodiments as follows.
  • the solution is similar to that described in the above embodiments.
  • the second nip N2 in the press section is not formed between the press-suction roll 11 and the centre roll 1, but in this embodiment, on the run of the first press felt 10 after the press-suction roll 11, a grooved roll 15 or an equivalent roll provided with a hollow face 16 is provided, which forms the second nip N2 in the press section with the centre roll 1.
  • the first press felt 10 is formed as an endless loop, as is the case in the above embodiments, by means of guide and alignment rolls 17.

Landscapes

  • Paper (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)

Claims (5)

  1. Pressenpartie einer Papier- oder Kartonmaschine, mit einer Anzahl von Walzen (1,11,15,22,32,44,70), die miteinander Presskniffe (N₁,N₂,N₃,N₄) bilden, die eine Bahn (W) entwässern, wobei die Bahn angeordnet ist, um durch diese Kniffe zu laufen, und von den Walzen zumindest eine Walze (1;70) eine glattflächige, sogenannte Mittelwalze ist, die einen Presskniff (N₂,N₃;N₄) bildet, und zwar mit zumindest einer weiteren Presswalze (11,15,32;44), über welche ein als Endloslauf ausgebildeter Pressfilz (10,30;40) geleitet wird, um Wasser aus der Bahn (W) heraus in den Pressfilz (10,30;40) zu absorbieren, dadurch gekennzeichnet, daß die Mittelwalze (1;70) eine Walze mit einstellbarer Bombierung ist, die einen drehbar auf einer ortsfesten Walzenachse (3;72) angeordneten Walzenmantel (2;71) aus Metall sowie zumindest einen Satz von Bombierungseinstelleinrichtungen (4,5;73) hat, die angeordnet sind, um den Walzenmantel (2;71) in Richtung der Kniffebene (K₂,K₃;K₄) der Mittelwalze (1;70) und der Walze (11,15,32;44) zu belasten, die mit der Mittelwalze einen Presskniff (N₂,N₃;N₄) bildet, um das Linearlastprofil in dem Kniff (N₂,N₃;N₄) zu regeln.
  2. Pressenpartie nach Anspruch 1, dadurch gekennzeichnet, daß die Bombierungseinstelleinrichtung (4;73) in der Mittelwalze (1;70) eine Kammer mit Druckfluid oder eine Reihe von Kammern hat, die ihrerseits bekannt ist und die zwischen dem Walzenmantel (2;71) und der Walzenachse (3;72) angebracht ist.
  3. Pressenpartie nach Anspruch 1, wobei die Mittelwalze (1) mit zwei weiteren Presswalzen (11 oder 15,32) Presskniffe (N₂,N₃) bildet, dadurch gekennzeichnet, daß in der Mittelwalze (1) Bombierungseinstelleinrichtungen (4,5) vorgesehen sind, um den Walzenmantel (2) in den Richtungen der Kniffebenen (K₂,K₃) von beiden der Kniffe (N₂,N₃) zu belasten, um die Linearlastprofile in beiden Kniffen (N₂,N₃) zu regeln.
  4. Pressenpartie nach Anspruch 3, dadurch gekennzeichnet, daß die Kniffebenen (K₂,K₃) miteinander einen Winkel α bilden, wobei der Winkel von 180° unterschiedlich ist.
  5. Pressenpartie nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß die Bombierungseinstelleinrichtungen (4,5) Belastungsschuh-Aufbauten haben, die ihrerseits bekannt sind, die an der Walzenachse abgestützt sind und auf die Innenfläche des Walzenmantels (2) wirken.
EP90850218A 1989-05-30 1990-05-29 Presspartie an Papier- oder Kartonmaschine Expired - Lifetime EP0401190B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI892625A FI86753C (fi) 1989-05-30 1989-05-30 Pressparti foer en pappers- eller kartongmaskin
FI892625 1989-05-30

Publications (3)

Publication Number Publication Date
EP0401190A2 EP0401190A2 (de) 1990-12-05
EP0401190A3 EP0401190A3 (de) 1992-01-02
EP0401190B1 true EP0401190B1 (de) 1995-08-02

Family

ID=8528534

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90850218A Expired - Lifetime EP0401190B1 (de) 1989-05-30 1990-05-29 Presspartie an Papier- oder Kartonmaschine

Country Status (6)

Country Link
EP (1) EP0401190B1 (de)
CN (1) CN1048813A (de)
AT (1) ATE125894T1 (de)
CA (1) CA2017010C (de)
DE (1) DE69021277T2 (de)
FI (1) FI86753C (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992008003A1 (en) * 1990-10-31 1992-05-14 Beloit Corporation Paper web heating on a press roll
DE4140879A1 (de) * 1991-12-11 1993-06-17 Voith Gmbh J M Pressenpartie
FI88812C (fi) * 1992-03-05 1993-07-12 Valmet Paper Machinery Inc Anordning vid styrning av banans spetsdragningsband i en pappersmaskin
DE19654325A1 (de) * 1996-12-24 1998-06-25 Voith Sulzer Papiermasch Gmbh Pressenpartie für eine Papiermaschine
WO2018206216A1 (de) * 2017-05-10 2018-11-15 Voith Patent Gmbh Vorrichtung und verfahren zur herstellung einer faserstoffbahn

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1193792B (de) * 1961-06-30 1965-05-26 Textilmaschinen Eduard Kuester Walze fuer die Druckbehandlung von Warenbahnen
US3477907A (en) * 1966-03-09 1969-11-11 Beloit Corp Press arrangement for papermaking machine
CH607635A5 (de) * 1976-06-14 1978-09-29 Escher Wyss Ag
DE3117787A1 (de) * 1981-05-06 1982-12-09 J.M. Voith Gmbh, 7920 Heidenheim Pressenpartie einer papiermaschine mit einer darin angeordneten steinwalze
DE3808293C2 (de) * 1988-03-12 1994-08-18 Voith Gmbh J M Langspalt-Preßwalze
US4889048A (en) * 1988-04-13 1989-12-26 Miller Ray R High heat flux roll and press utilizing same
DE3815278A1 (de) * 1988-05-05 1989-11-16 Voith Gmbh J M Pressenpartie einer maschine zur herstellung einer faserstoffbahn, insbesondere papierbahn

Also Published As

Publication number Publication date
ATE125894T1 (de) 1995-08-15
FI86753C (fi) 1992-10-12
DE69021277T2 (de) 1996-01-11
FI892625A (fi) 1990-12-01
DE69021277D1 (de) 1995-09-07
CA2017010A1 (en) 1990-11-30
CA2017010C (en) 1995-07-18
FI86753B (fi) 1992-06-30
EP0401190A2 (de) 1990-12-05
CN1048813A (zh) 1991-01-30
FI892625A0 (fi) 1989-05-30
EP0401190A3 (de) 1992-01-02

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