EP0770727B1 - Verfahren und Vorrichtung zur Entwässerung einer Papierbahn durch Pressen - Google Patents
Verfahren und Vorrichtung zur Entwässerung einer Papierbahn durch Pressen Download PDFInfo
- Publication number
- EP0770727B1 EP0770727B1 EP96120948A EP96120948A EP0770727B1 EP 0770727 B1 EP0770727 B1 EP 0770727B1 EP 96120948 A EP96120948 A EP 96120948A EP 96120948 A EP96120948 A EP 96120948A EP 0770727 B1 EP0770727 B1 EP 0770727B1
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- European Patent Office
- Prior art keywords
- web
- press
- roll
- extended
- fabric
- 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.)
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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
- D21F3/04—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 concerns a method for dewatering of a paper or board web according to the preamble of claim 1, being based on "Zum von Schuhpressen” bei Schuchpressen bei Schreib-und Druckpapieren", Kliblatt für Textilfabrikation, N. 5, 1988, page 177, Fig 15.
- the invention concerns a paper making machine according to the preamble of claim 7, being based on the above mentioned prior art document.
- the structure of paper in particular of printing paper, must also be symmetric.
- the good printing properties required from printing paper mean good smoothness, evenness and certain absorption properties at both faces.
- the properties of paper, in particular the symmetry of density, are affected considerably by the operation of the press section in a paper machine, which has also a decisive significance for the evenness of the transverse profiles and longitudinal profiles of the paper.
- Dewatering by means of pressing is energy-economically preferable to dewatering by evaporation. This is why attempts should be made to remove a maximum proportion of water out of a paper web by pressing in order that the proportion of water that must be removed by evaporation could be made as low as possible.
- the increased running speeds of paper machines provide new, so far unsolved problems expressly in the dewatering taking place by pressing, because the press impulse cannot be increased sufficiently by the means known in prior art, above all because, at high speeds, the nip times remain unduly short and, on the other hand, the peak pressure of compression cannot be increased beyond a certain limit without destruction of the structure of the web.
- the property profiles of the paper that is produced in the machine direction are also affected significantly by oscillations of the press section, the transverse variations of properties by the transverse profiles of the nip pressures in the press nips, and with increasing running speeds of the machine these profile problems tend to be increased remarkably.
- the object of the present invention is to provide novel solutions for the problems discussed above so that the above drawbacks in prior art and the drawbacks that will come out later are substantially avoided.
- An object of the invention is to provide a method for dewatering of a paper web by pressing at high speeds, in particular at speeds of about 25...40 m/s, so that the adjustability of the press section is versatile, the properties of quality of the web produced can be kept high, and the web is not subjected to excessive dynamic forces that produce breaks.
- one of the aims is that the overall construction of the press section, in particular its frame construction, should be such that the replacement of press rolls and press fabrics can be accomplished quickly so as to minimize the standstill times.
- the method of the invention is characterized by the features of the characterizing part of claim 1.
- the paper making machine of the invention is characterized by the features of the characterizing part of claim 7.
- the most important objective achieved by means of the invention is a satisfactory running quality of the paper machine even at speeds as high as about 30...40 m/s. This has been achieved because of a "linear" draw of the web and of a nip arrangement that provides sufficiently long nip times.
- the method and the press section in accordance with the invention are intended for use above all with thin paper qualities, whose grammage is lower than 120 g/m 2 and with which a closed draw of the web is indispensable at the high web speeds meant in the invention.
- the invention also achieves a sufficiently cautious and gentle start of the dewatering, which is important because at high speeds the water contents in the web after the former also tend to be higher.
- the extended-nip presses are accomplished by means of hose rolls or band rolls and provided with a number of different possibilities of setting or active regulation, whereby it is possible to control the profiles of properties of the web both in the machine direction and in the transverse direction.
- said "Sym-Belt Press” provides several advantages of synergism, of which should be mentioned that said press produces practically no oscillations at all, for which reason it is well suitable also for very high speeds, said press permits keeping of the nip loads at a sufficiently low level in particular in the initial part of the press section and makes it possible to keep the nip times at a reasonable level even at very high speeds (30...40 m/s).
- said "Sym-Belt Press” provides entirely novel possibilities to control and to regulate the distribution of the nip pressures in the extended-nip zone both in the machine direction and in the transverse direction. Further advantages include low power consumption, elimination of difficulties of oil treatment, reduced wear of the mantle of the hose roll, and reasonable dry solids content of the web even at high speeds (30...40 m/s).
- US Patent No. 4,584,059 as well as to the applicant's FI Patent No. 66,932 and FI Patent Applications Nos. 892517 and 892518.
- Figure 2 is an axonometric, partly sectional view of a hose roll of a "Sym-Belt Press" applicable in the invention.
- Figure 3 is an axonometric view of a press shoe that can be loaded and profiled in a versatile way and that is fitted inside the hose roll and employed in a press as shown in Fig. 10.
- Figure 4 shows an alternative construction that accomplishes an extended nip and that is provided with a closed glide belt loop.
- the press section comprises a first upper fabric 20 that receives water, onto which fabric the web W is transferred on the suction zone 21a of the pick-up roll 21 at the pick-up point P from the forming wire 10, whose return run starts from the wire drive roll 12.
- the press has two subsequent press nips, which remove water from the web W efficiently and between which the web W has a fully closed draw so that it is constantly supported by a fabric.
- both nips NP 1 and NP 2 are so-called extended nips, whose press zone is substantially longer than that in a normal sharp roll nip.
- the more detailed embodiments of the extended nips will be returned to later, mainly in connection with the descriptions related to Figs. 2, 3 and 4.
- the first upper fabric is guided by alignment, tensioning and guide rolls 22 and conditioned by conditioning devices 23.
- the first extended nip NP 1 includes a lower fabric 30 that receives water, being guided by alignment, tensioning and guide rolls 32 and conditioned by conditioning devices 33.
- the first extended nip NP, and so also the second extended nip NP 2 are accomplished in a "Sym-Belt Press" of the applicant, and the details of the construction of said press will be discussed later.
- the construction of the press is such that the extended nip NP 1 is composed of a flexible hose mantle and of a backup roll.
- the press section includes a second upper fabric 40, onto which the web is transferred as a closed draw by means of the suction zone 41a of the suction roll 41. After the first nip NP 1 , it is ensured that the web W follows the first lower fabric 30 by means of a suction box 36 or a corresponding foil arrangement.
- the second upper fabric 40 is guided by alignment, tensioning and guide rolls 42 and conditioned by conditioning devices 43.
- the second extended nip NP 2 is also formed in connection with a hose roll 45, which is similar to the hose roll at the extended nip NP 1 .
- the lower press member at the nip NP 2 is a smooth-faced 105' press roll 105, in connection with whose lower sector a doctor 107 operates, which doctors the web W o going to broke handling and the leader band to the broke handling arrangement placed below (not shown).
- the smooth face 105' of the press roll 105 makes sure that, after the extended nip NP 2 , the web W follows the face 105' of the lower roll 105, from which it is detached by means of a transfer nip N 5 and is transferred on support of the drying wire 80, which is guided by the guide roll 81, to the drying section, of which the first heated drying cylinders 82 and leading cylinders 83 are shown in the figures.
- Single-wire draw is employed at least in the first cylinder group in the drying section.
- the run of the web W to be pressed through the press section is highly linear without major curves. Owing to the linear path of the web, the dynamic forces applied to the web remain sufficiently low in view of minimizing the risk of breaks.
- the magnitude of the angle a of change in the direction of the web W is in the range of a ⁇ 10...30° and, as a rule, a ⁇ 15°.
- An exception from this may be formed by the pick-up roll 21 and its suction zone, at which locally even a high negative pressure may be employed, as well as, in Fig. 1, by the smooth-faced 105' lower press roll 105 and its turning sector b.
- a press geometry as shown in Fig. 1 is not preferable when the maximum speed range (30...40 m/s) of the applications of the invention is employed.
- the hose roll 200 comprises an elastic mantle 201, which is made, e.g., of fabric-reinforced polyurethane, so that the hose mantle 201 is made of rubber-like stretching material, whose maximum elongation is, e.g., about 20...40 %.
- the thickness of the hose mantle 201 is, e.g., about 2...5 mm.
- annular ends 202a and 202b are fixed permanently, the inner parts of said ends being fixed and sealed against revolving axle journals 207a and 207b, which are mounted on the frame parts 110 of the machine by means of fixed bearing supports.
- the hose roll 200 includes a stationary inner frame 205, around which the hose mantle 201 with its ends 202a,202b revolves on the bearings 206a and 206b.
- cylinder block sets 203 two sets side by side, are fitted in the inner frame 205.
- hydraulic support members 206,207 of the glide shoe 210 operate, which members are, thus, placed in two rows, e.g., with a spacing of about 25 cm in the transverse direction one after the other.
- the two rows of the hydraulic support members 206,207 support a support plate 209, to which a glide shoe 210, e.g., of aluminium is attached, in whose area an extended nip zone NP is formed against a backup roll.
- the glide shoe 210 is provided with a smooth glide face 211, which operates as a press member against the smooth inner face of the hose mantle 201.
- the glide shoe 210 has a series of hydrostatic chambers 212 placed one after the other, which chambers contribute to the formation of a hydrostatic loading pressure and to oil lubrication of the glide face 211.
- Each of the subsequent cylinder blocks 203 communicates with a pipe connector 214, to which pipes 213 of loading medium pass so that a separately adjustable pressure can be passed into each individual block in the series of cylinder blocks 203.
- An example of the distribution of the nip pressure in an extended-nip zone NP is such a distribution in the machine direction in which the nip pressure (the pressure applied to the web W) at the front edge of the shoe 210 rises, owing to the hydrodynamically generated pressure, to about 40 bars, whereupon the pressure remains at this value as invariable, and in the trailing area of the shoe there is still an increase in the pressure, while the peak pressure is about 70 bars, from which value the pressure goes abruptly to zero at the trailing edge of the shoe 210.
- said distribution of pressure can be varied so as to obtain an optimal pressing result.
- the compression pressure at the hose roll 200 and the distribution of said pressure in the machine direction can be arranged such that the start of the dewatering, while the dry solids content of the web W is still relatively low, can be carried out so gently that the fibre structure of the web W is not deteriorated.
- a regulation system related to the invention is sketched, by whose means the pressure profiles of the extended nip NP in the transverse direction and in the machine direction can be controlled.
- the regulation system is illustrated by the block 250, from which a series of regulation signals c 1 is given which regulate the hydraulic pressures fed through the pipes 213.
- a feedback signal is received from separate wirings 214, which is illustrated by the series of signals c 2 .
- the system 250 communicates with a measurement arrangement 260, by whose means the different profiles of the paper web W produced, such as moisture or thickness profiles, are measured, and this provides a series of feedback signals c, for the regulation system 250, which produces the series of regulation signals c 1 .
- the hose roll 200 is oil-tight, and the interior of the hose 201 can be arranged as slightly pressurized. From the glide faces 211 of the glide shoes 210, a slight leakage of oil takes place, which oil is collected from inside the hose mantle 201 and passed through the pipe 215 back to the oil circulation.
- the hose roll 200 shown in Figs. 2 and 3 is preferably mounted on fixed bearing supports, in which case the extended nip NP must be opened by means of a movement of the backup roll. This is necessary, because a play of, e.g., about 40 mm for movement of the glide shoes 210 of the hose roll is not sufficient for opening the nip NP sufficiently, e.g., for replacement of the fabrics.
- Fig. 4 shows a second embodiment of a hose roll 300.
- a band 301 loop is used that is longer than the circular hose mantle 201.
- Said band 301 is guided from inside and the extended nip NP is loaded by a hydrostatically and hydrodynamically loaded glide shoe 310, which is fitted inside the band 301 loop and which has a hydrostatically loadable series of pressure fluid chambers 312 in the area of the extended nip NP.
- a beam 305 is fitted, which is provided with a series of hydraulic loading members 306 and 307, by whose means the glide shoe 310 can be loaded in a controlled way.
- the band loop 301 is guided by a leading roll 311, in whose connection a spreader roll 312 is operative. Both ends of the band loop 301 are closed by means of end pieces so as to prevent oil leakages and splashes, of which end pieces one piece 312a is shown in Fig. 4.
- the more detailed embodiment of the band roll shown in Fig. 4 comes out, e.g., from the applicant's FI Pat. Appl. No. 891380 (corresp. US Pat. Appl. 486,754).
- the backup roll used in an extended nip NP as shown in Fig. 4 is an adjustable-crown roll 160, e.g. an adjustable-crown roll marketed by the applicant under the trade mark "Sym-Z Roll", which forms an extended nip NP by means of its sector C with the band roll 300.
- a corresponding roll can be used together with the hose roll 200.
- the roll 160 has a cylinder mantle 161, against whose smooth inner face 162 a series of glide shoes 165 operates, which is provided with hydraulic lubrication and loading chambers 166.
- the series of shoes 165 is loaded by means of a series of hydraulic actuators 164.
- the backup roll 160 is employed together with the fabric 60 as a member that receives water, the outer face of the mantle 160 is provided with a hollow face.
- the principal purpose of the roll 160 is to heat the web 60, e.g., by means of induction heating devices 170, a smooth mantle face is employed on the roll.
- a heating device in connection with the mantle 161 of the roll 160, a heating device is provided, e.g. an inductive heating device 170, by whose means the temperature profile of the roll mantle, and thereby the profile and the dewatering capacity of the extended nip, can be affected.
- the roll 160 can also be used so that it has a smooth outer face and that by its means the web W is pressed directly, in which case there is no fabric 60 in between, and in this way the web W can be heated directly, thereby affecting the viscosity of the water present in the web and the elastic properties of the web W, thus promoting the dewatering and the transverse profile of the dry solids content.
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Claims (13)
- Verfahren zum Entwässern einer Papierbahn oder Pappbahn durch ein Pressen bei einer Papiermaschine, in der die Bahn (W) von einer Bahnbildungspartie zu einer Pressenpartie und anschließend zu einer Trockenpartie tritt, wobei die Papierbahn in der Bahnbildungspartie einem Ablaufen unterworfen wurde, wobei das Entwässern bewirkt wird, indem die Papierbahn an Wasseraufnahmegeweben durch die Pressenpartie tritt, die zwei aufeinander folgende Entwässerungslangspaltpressen (NP1, NP2) hat, die durch eine Schlauchwalze oder eine Bandwalze und einer Gegenwalze ausgebildet sind, wobei die Bahn einen geschlossenen Zug hat, der durch ein Wasseraufnahmegewebe von der Aufnahmestelle (P) des Bahnbildungssiebes (10) zu dem zweiten Langpressenspalt (NP2) konstant gestützt ist, wobei das Verfahren die folgenden Schritte aufweist:a) Übertragen der Bahn von der Aufnahmestelle (P) an dem Bahnbildungssieb (10) zu der unteren Seite eines ersten oberen Wasseraufnahmegewebes (20) ;b) Treten der Bahn zwischen dem ersten oberen Gewebe (20) und einem ersten unteren Wasseraufnahmegewebe (30) durch den ersten Langpressenspalt (NP1);c) Bewirken, dass die Bahn dem ersten unteren Gewebe (30) nach dem ersten Langpressenspalt (NP1) folgt;d) Übertragen der Bahn von dem ersten unteren Gewebe (30) zu einem zweiten oberen Wasseraufnahmegewebe (40);e) Treten der Bahn zusammen mit dem zweiten oberen Gewebe (40) durch den zweiten Langpressenspalt (NP2);e1) wobei der zweiten Langpressenspalt (NP2) zwischen der Schlauchwalze oder der Bandwalze an einer oberen Position und einer mit einer glatten Seite versehenen zylindrischen Gegenwalze (105) an einer unteren Position ausgebildet ist;e2) wobei die Bahn in einem direkten Kontakt mit der mit der glatten Seite versehenen zylindrischen Gegenwalze (105) während des Hindurchtretens durch den zweiten Langspalt (NP2) steht; undf) Treten der Bahn entlang eines Teiles des Umfangs der zylindrischen Gegenwalze (105) nach der zweiten Langspaltpresse (NP2),A) die Papierbahn von der mit der glatten Seite versehenen zylindrischen Gegenwalze (105) des zweiten Langpressenspaltes (NP2) zu dem Trocknungssieb (80) mittels eines Übertragungsspaltes übertragen wird, der zwischen der Gegenwalze und einer Führungswalze (81) ausgebildet ist, um die herum das Trocknungssieb für ein Vorbeitreten eingerichtet ist;B) die Länge von jedem der beiden aufeinanderfolgenden Langspalte (NP1, NP2) mehr als ungefähr 100 mm beträgt;C) die Bahn durch die Pressenpartie bei einer Geschwindigkeit tritt, die mehr als ungefähr 25 m/s beträgt;D) die Übertragung der Bahn von dem ersten unteren Gewebe (30) zu dem zweiten oberen Gewebe (40) mittels einer Saugwalze (41) bewirkt wird, die sich zwischen dem ersten und dem zweiten Langpressenspalt befindet;E) die Verteilung des Kompressionsdruckes in zumindest einem der Langpressenspalte sowohl in der Querrichtung der Bahn als auch in der Maschinenrichtung der Bahn zum Einstellen oder Steuern der verschiedenen Profile der Eigenschaften der Bahn geregelt und / oder gewählt wird.
- Verfahren gemäß Anspruch 1,
dadurch gekennzeichnet, dass
die Saugwalze (41) durch das zweite obere Gewebe (40) umschlungen ist. - Verfahren gemäß einem der Ansprüche 1-2,
dadurch gekennzeichnet, dass
der maximale Kompressionsdruck (P) der in den Langspaltzonen (NP1, NP2) verwendet wird, auf den Bereich 3-9 MPa und vorzugsweise auf 5-8 MPa eingestellt ist, und
die Verteilung des Druckes vorzugsweise derart eingestellt wird, dass an dem Anfangsabschnitt der Langpressenspalte der Kompressionsdruck steil ansteigt, woraufhin der Kompressionsdruck im wesentlichen unveränderlich gehalten wird und an dem hinteren Ende der Langpressenspalte der Kompressionsdruck derart geregelt wird, dass er höher als in dem Bereich des unveränderlichen Kompressionsdruckes ist. - Verfahren gemäß einem der Ansprüche 1-3,
dadurch gekennzeichnet, dass
das Entwässerungspressen der Bahn (W) gestartet wird, wenn der Trockengehalt der Bahn (W) 10 % beträgt, und Wasser aus der Bahn entfernt wird, so dass nach der Pressenpartie ihr Trockengehalt kout = 35-65 % und vorzugsweise kout = 40-55 % beträgt. - Verfahren gemäß einem der Ansprüche 1-4,
dadurch gekennzeichnet, dass
Anwenden einer Rakelvorrichtung (104) an der mit der glatten Seite versehenen zylindrischen Gegenwalze (105). - Verfahren gemäß einem der Ansprüche 1-5,
dadurch gekennzeichnet, dass
Konditionieren der ersten Gewebe (20, 30) und des zweiten Gewebes (40) mit Konditioniervorrichtungen. - Papierherstellmaschine, bei der eine Papierbahn oder Pappbahn (W), die durch ein Pressen entwässern wird, von einer Bahnbildungspartie zu einer Pressenpartie und weiter in einer Trockenpartie tritt, wobei die Pressenpartie zwei aufeinander folgende Langpressspalte (NP1, NP2) und Wasseraufnahmepressgewebe (20, 30, 40) aufweist, die durch die Langpressenspalte treten, wobei die Wasseraufnahmegewebe in einer derartigen Weise eingesetzt sind, dass die zu entwässernde Papierbahn einen geschlossenen Zug hat, der durch ein Wasseraufnahmepressgewebe von der Aufnahmestelle (P) an den Bahnbildungssieb (10) zu dem zweiten Langpressenspalt (NP2) konstant gestützt ist, wobei die Maschine folgendes aufweist:a) eine erste Schleife eines oberen Wasseraufnahmepressgewebes (20), das so eingerichtet ist, dass es durch den ersten Langspalt (NP1) tritt;b) ein erstes unteres Wasseraufnahmepressgewebe (30), das so eingerichtet ist, dass es durch den ersten Langpressenspalt tritt;c) wobei die erste Langspaltpresse (NP1) zwischen einer Schlauchwalze oder Bandwalze (25) und einer gegenüberstehenden Gegenwalze (35) ausgebildet ist;d) eine erste Saugaufnahmewalze (21) innerhalb der Schleife des ersten oberen Pressgewebes (20) für ein Übertragen der Bahn von dem Bahnbildungssieb zu dem ersten oberen Pressgewebe (20);e) ein zweites oberes in einer Schleife vorgesehenes Wasseraufnahmepressgewebe (40), das so eingerichtet ist, dass es durch den zweiten Langpressenspalt (NP2) tritt;f) wobei der zweite Langpressenspalt (NP2) zwischen einer mit einer glatten Seite versehenen zylindrischen Gegenwalze (105) an einer unteren Position und einer Schlauchwalze an einer oberen Position ausgebildet ist, wobei die Papierbahn in einem direkten Kontakt mit der mit der glatten Seite versehenen Gegenwalze (105) in dem zweiten Langpressenspalt steht und der Seite der Gegenwalze nach dem zweiten Langpressenspalt folgt,A) die Papierbahn (W) von der mit der glatten Seite versehenen zylindrischen Gegenwalze (105) des zweiten Langpressenspaltes (NP2) zu dem Trocknungssieb (80) mittels eines Übertragungsspaltes (S) übertragen wird, der zwischen der Gegenwalze und einer Führungswalze (81) ausgebildet ist, um die herum das Trocknungssieb für ein Vorbeitreten eingerichtet ist;B) die Länge der beiden Langpressenspalte (NP1, NP2) mehr als ungefähr 100 mm beträgt;C) eine zweite Saugaufnahmewalze (41) zwischen dem ersten und dem zweiten Langpressenspalt vorgesehen ist, um die Bahn von dem ersten unteren Pressengewebe (30) zu dem zweiten oberen Pressengewebe (40) zu übertragen;D) eine Rakel (107) an der mit der glatten Seite versehenen zylindrischen Gegenwalze des zweiten Langpressenspaltes (NP2) angeordnet ist.
- Papierherstellmaschine gemäß Anspruch 7,
dadurch gekennzeichnet, dass
die zweite Saugaufnahmewalze (41) innerhalb der Schleife des zweiten oberen Gewebes (30) angeordnet ist. - Papierherstellmaschine gemäß einem der Ansprüche 7 und 8,
dadurch gekennzeichnet, dass
der erste Langpressenspalt (NP1) zwischen einer zylindrischen mit einer hohlen Seite versehenen Pressenwalze (35) an einer unteren Position und der Schlauchwalze oder Bandwalze (201) an einer oberen Position ausgebildet ist. - Papierherstellmaschine gemäß einem der Ansprüche 7-9,
dadurch gekennzeichnet, dass
die Rakel (107) eingerichtet ist, damit die Papierbahn zu einer Abfallstoffbehandlung tritt. - Papierherstellmaschine gemäß einem der Ansprüche 7-10,
dadurch gekennzeichnet, dass
zumindest eine Walze der Bandwalze oder Schlauchwalze (200, 300) eine flexible Bandschleife (301) mit geschlossenen Enden aufweist. - Papierherstellmaschine gemäß einem der Ansprüche 7 bis 11,
dadurch gekennzeichnet, dass
zumindest eine Walze der Bandwalze oder Schlauchwalze (200, 300) eine Schlauchwalze mit geschlossenen Enden ist. - Papierherstellmaschine gemäß einem der Ansprüche 7 bis 12,
gekennzeichnet durch
Konditioniervorrichtungen (23; 33; 43) für ein Konditionieren der ersten Gewebe (20,30) und des zweiten Gewebes (40).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI905798A FI96789C (fi) | 1990-11-23 | 1990-11-23 | Menetelmä ja laite veden poistamiseksi paperiradasta puristamalla |
FI905798 | 1990-11-23 | ||
EP91850291A EP0487483B1 (de) | 1990-11-23 | 1991-11-22 | Verfahren und Vorrichtung zur Entwässerung einer Papierbahn durch Pressen |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91850291.5 Division | 1991-11-22 | ||
EP91850291A Division EP0487483B1 (de) | 1990-11-23 | 1991-11-22 | Verfahren und Vorrichtung zur Entwässerung einer Papierbahn durch Pressen |
Publications (2)
Publication Number | Publication Date |
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EP0770727A1 EP0770727A1 (de) | 1997-05-02 |
EP0770727B1 true EP0770727B1 (de) | 2002-06-05 |
Family
ID=8531454
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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EP96120948A Expired - Lifetime EP0770727B1 (de) | 1990-11-23 | 1991-11-22 | Verfahren und Vorrichtung zur Entwässerung einer Papierbahn durch Pressen |
EP91850291A Expired - Lifetime EP0487483B1 (de) | 1990-11-23 | 1991-11-22 | Verfahren und Vorrichtung zur Entwässerung einer Papierbahn durch Pressen |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
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EP91850291A Expired - Lifetime EP0487483B1 (de) | 1990-11-23 | 1991-11-22 | Verfahren und Vorrichtung zur Entwässerung einer Papierbahn durch Pressen |
Country Status (5)
Country | Link |
---|---|
EP (2) | EP0770727B1 (de) |
AT (2) | ATE218648T1 (de) |
CA (1) | CA2055927C (de) |
DE (2) | DE69129788T2 (de) |
FI (1) | FI96789C (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10343215A1 (de) * | 2003-09-18 | 2005-04-14 | Voith Paper Patent Gmbh | Schuhwalze |
Families Citing this family (31)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI98844C (fi) * | 1991-12-23 | 1997-08-25 | Valmet Paper Machinery Inc | Paperikoneen puristinosa, etenkin painopaperilaaduille |
US5639351A (en) | 1991-12-23 | 1997-06-17 | Valmet Corporation | Press section of a paper machine, in particular for printing paper qualities |
DE59301463D1 (de) * | 1992-11-24 | 1996-02-29 | Voith Gmbh J M | Pressenpartie für eine Papiermaschine |
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WO2001018308A1 (en) * | 1999-09-06 | 2001-03-15 | Metso Paper Karlstad Ab | Board machine and method of manufacturing a multilayer cardboard web |
EP1342839B1 (de) | 2002-03-01 | 2006-11-22 | Voith Patent GmbH | Verfahren und Vorrichtung zur Messung der Härte oder Verdichtung einer Bespannung |
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ATE376095T1 (de) * | 2002-09-09 | 2007-11-15 | Metso Paper Inc | Verfahren zur herstellung von pappe und maschine zur herstellung von pappe |
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- 1991-11-22 AT AT96120948T patent/ATE218648T1/de not_active IP Right Cessation
- 1991-11-22 DE DE69129788T patent/DE69129788T2/de not_active Expired - Fee Related
- 1991-11-22 EP EP96120948A patent/EP0770727B1/de not_active Expired - Lifetime
- 1991-11-22 AT AT91850291T patent/ATE168423T1/de not_active IP Right Cessation
- 1991-11-22 EP EP91850291A patent/EP0487483B1/de not_active Expired - Lifetime
- 1991-11-22 DE DE69133030T patent/DE69133030T2/de not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
ATE218648T1 (de) | 2002-06-15 |
EP0770727A1 (de) | 1997-05-02 |
CA2055927C (en) | 1999-02-02 |
ATE168423T1 (de) | 1998-08-15 |
DE69129788D1 (de) | 1998-08-20 |
FI905798A0 (fi) | 1990-11-23 |
DE69129788T2 (de) | 1998-11-19 |
FI96789C (fi) | 1996-08-26 |
CA2055927A1 (en) | 1992-05-24 |
DE69133030D1 (de) | 2002-07-11 |
FI96789B (fi) | 1996-05-15 |
EP0487483B1 (de) | 1998-07-15 |
EP0487483A1 (de) | 1992-05-27 |
FI905798A (fi) | 1992-05-24 |
DE69133030T2 (de) | 2002-11-21 |
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