EP0468005B1 - Anordnung zum überführen einer bahn von der pressen- zur trockenpartie einer papiermaschine - Google Patents

Anordnung zum überführen einer bahn von der pressen- zur trockenpartie einer papiermaschine Download PDF

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Publication number
EP0468005B1
EP0468005B1 EP91901763A EP91901763A EP0468005B1 EP 0468005 B1 EP0468005 B1 EP 0468005B1 EP 91901763 A EP91901763 A EP 91901763A EP 91901763 A EP91901763 A EP 91901763A EP 0468005 B1 EP0468005 B1 EP 0468005B1
Authority
EP
European Patent Office
Prior art keywords
web
felt
belt
press
transfer felt
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
EP91901763A
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German (de)
English (en)
French (fr)
Other versions
EP0468005A1 (de
Inventor
Albrecht Meinecke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JM Voith GmbH
Original Assignee
JM Voith GmbH
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Filing date
Publication date
Application filed by JM Voith GmbH filed Critical JM Voith GmbH
Publication of EP0468005A1 publication Critical patent/EP0468005A1/de
Application granted granted Critical
Publication of EP0468005B1 publication Critical patent/EP0468005B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders
    • D21F5/042—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0063—Devices for threading a web tail through a paper-making machine

Definitions

  • the invention relates to an arrangement for transferring a fibrous web, preferably paper web (hereinafter referred to as "web"), from the press section to the dryer section of a paper machine, in particular with the features specified in the preamble of claim 1.
  • web preferably paper web
  • it is an arrangement in which an endless belt running through the last press nip of the press section, which is designed as a water-absorbent felt belt, has a double function: the felt belt takes at least part of the im-press nip from the web in the usual way squeezed out water to remove it.
  • this felt belt guides the web from the press section into the dryer section, running together with the web at least over the first dryer cylinder of the dryer section.
  • This felt tape is therefore called “transfer felt” below.
  • the last press of the press section has only a single felt belt, namely a bottom felt, which at the same time has the function of the transfer felt.
  • the web to be dewatered thus comes into direct contact with the top roller of the last press.
  • This top roller therefore has a smooth and generally hard outer surface, for example formed from granite or artificial stone. It is generally known that in such an arrangement the web adheres to the top roller a little behind the press nip and with a certain tension from the top roller must be deducted.
  • the web runs at least a short distance, ie without support from the transfer felt.
  • the first drying cylinder of the dryer section is arranged within the loop of the transfer felt. The web therefore does not come into direct contact with this first drying cylinder. This results - particularly at high working speeds - in the danger that the paper web will lift off from the transfer felt due to the centrifugal force on the first drying cylinder.
  • a disadvantage of this arrangement is that the web comes into contact with the relatively hard and coarse dryer fabric very early, ie while it is still relatively moist and soft. As a result, there is a risk that the dryer fabric leaves permanent impressions in the paper web. Such embossings may be accepted for coarse paper types, which are intended for packaging purposes, for example, but not, for example, for printing and writing papers. In addition, the adherence of the paper web to the relatively coarse surface is not always guaranteed, especially at high speeds.
  • the essence of the invention consists in the combination of the previously only individually known features, namely guiding the web through the last press of the press section between two belts (of which the "first belt” as before also functions as the transfer felt running from the press section to the dryer section has) and separating the web from the "second belt” by means of a separating device which works in such a way that a free web tension is avoided.
  • This achieves two effects at the same time: firstly, any longitudinal stretching of the paper web within the press section and when transferring it to the dryer section is avoided; on the other hand, the transfer felt is heated as it runs over at least the first drying cylinder of the dryer section, so that it returns to the last press at a higher temperature than before. This increases the drainage capacity of the last press; because the heated felt now has a lower flow resistance for the water to be absorbed from the paper web.
  • the transfer felt performs a third function by pressing the web at least onto the first dryer cylinder of the dryer section.
  • the arrangement is such that the web always comes into direct contact with that drying cylinder or drying cylinders over or over which the transfer felt runs. This ensures that the drying of the web starts quickly from the start.
  • an additional felt or wire belt is required on the drying cylinder (s) mentioned in order to keep the web in contact with the transfer felt.
  • the paper web in the initial area of the dryer section (ie at least on the first drying cylinder) is pressed by the transfer felt onto the drying cylinder or cylinders. Since the transfer felt, as already mentioned, has a fine structure, the risk in the initial area of the dryer section is avoided that permanent impressions are caused in the paper web, as can be caused by a much coarser dryer fabric. In other words, the invention makes it much easier than before to produce fine papers with the desired high quality properties.
  • the separating device mentioned in claim 1 and required behind the last press nip can be carried out in quite different ways: a suction box or a suction roller can be provided in a known manner. Or a first suction guide roller of the dryer section is used as a separating device. The arrangement of such a suction guide roller in front of the first drying cylinder is often desirable in order to obtain the largest possible wrap angle on the first drying cylinder.
  • this will preferably be designed as a long-gap press; i.e. has one of the two rollers - instead of a normal one, e.g. metallic roller shell - a flexible circumferential (tubular or band-shaped) pressing element which can be pressed onto the other roller by means of a support device (preferably a press shoe).
  • a support device preferably a press shoe
  • the transfer felt can take over either the function of the bottom felt or the function of the top felt in the last press. Both variants are described in detail below.
  • the "second endless belt" required according to claim 1 can either - like the transfer felt - be designed as a water-absorbent felt belt; or it is designed as an elastic press belt with a relatively low water absorption capacity.
  • the second band directly forms the flexible (tubular or band-shaped) pressing element of an extended-gap press. In this case, only a single water-absorbent felt belt (namely the transfer felt) is provided in the last press.
  • measures will be taken which serve to further increase the drainage capacity of the last press, namely by reducing the rewetting of the web behind the press nip as far as possible.
  • it can be provided to guide the transfer felt a little behind the press nip without the web over an auxiliary guide roller and from there back to the separating device.
  • the web runs behind the press nip initially only with the second belt and then changes on the separating device, which is designed as a take-off suction roll, onto the transfer felt.
  • the press shoe according to DE-OS 38 15 278 can be used design in such a way that it also takes over the function of the separating device, the rewetting of the web also being reduced.
  • Fig. 1 shows schematically the last press and the first dryer group of a paper machine.
  • FIGS. 2 and 4 to 6 show modifications of the arrangement according to FIG. 1.
  • FIG. 3 shows a cross section through the press shoe of an extended-nip press roll (enlarged detail from FIG. 2).
  • FIG. 1 shows a section of a paper-making machine with part of the press section 10 and with the beginning part of a drying section 20.
  • a double-felt press with an upper long-nip press roll 14 and with a counter-roll 13 below is first seen the long nip press roll 14 are shown schematically, a flexible circumferential tubular press jacket 14a and a press shoe 14b with which the press jacket can be pressed against the counter roll.
  • the usual stationary support body in which the press shoe 14b can slide in the radial direction and all other details are omitted.
  • the extended press nip formed by the press jacket 14a and the counter roll 13 is designated by 19.
  • a bottom felt 11, an upper felt 12 and the paper web 9 to be dewatered (and then dried) run through it. This is removed from a preceding felt belt 8 by means of a take-off suction roller 16 located in the upper felt 12.
  • the two felt belts 11 and 12 are usually designed as usual as water-absorbent wet felts.
  • a flexible press belt can be provided instead of the upper felt 12, the water absorption capacity of which is less than that of the lower felt 11.
  • the lower felt 11 also serves as a transfer felt; i.e. it transfers the paper web 9 from the press section 10 into the drying section 20. It is essential that the transfer felt 11 also serves to press the paper web 9 onto at least the first drying cylinder 21, preferably onto a group of, for example, four drying cylinders 21 and 22. Therefore, all of these drying cylinders 21, 22 lie outside the endless loop of the transfer felt 11.
  • both felt belts 11 and 12 (together with the paper web in between) can run together to a separating device 17.
  • a separating device 17 This is in Fig. 1 in the loop of the transfer felt 11 and is designed as a suction roll with a removal suction zone 17a, so that from here the paper web 9 runs together with the transfer felt 11.
  • FIG. 1 An alternative is shown in FIG. 1 with dash-dotted lines: the transfer felt 11 is diverted behind the press nip 19 without the web 9 via an auxiliary guide roller 42 and then runs back to the separating device 17. In the area of this diversion, the transfer felt 11 is conditioned, for example by the fact that the separating device 17 designed as a suction roll has a conditioning suction zone 17b.
  • the auxiliary guide roller 42 can be designed as a suction roller or as a blowing roller; or a pipe suction device is provided (Fig. 4, number 43).
  • the transfer felt 11 runs together with the paper web 9 over a guide roller 23.
  • a guide roller 24, 25 is provided behind each of the drying cylinders 21, 22. These guide rollers are all located within the loop of the transfer felt 11, so that the paper web 9 is in the area of the guide rollers on the outside of the transfer felt and is therefore subject to a certain centrifugal force.
  • the guide rollers 23, 24, 25 are designed in a known manner as suction rollers. From the last suction guide roll 25, the transfer felt 11 runs over an adjustable guide roll 26 and over further guide roll 27 back to the guide roll 15 of the press section 10. Between the guide rolls 25 and 26, the paper web 9 is fed with the help of a further felt belt or dryer fabric 28 and with the help of a take-off suction roll 29 removed from the transfer felt 11 and fed to a subsequent drying station, not shown.
  • the drying cylinders 21 and 22 form an essentially vertical row of cylinders. Instead, the drying cylinders could also be arranged in an essentially horizontal row.
  • FIG. 2 in contrast to FIG. 1, the long nip press roll 14 is arranged below the counter roll 13.
  • a special separating device (as in FIG. 1, item 17) is not provided for separating the upper felt 12 from the paper web 9 and from the transfer felt 11.
  • Both other variants are shown. According to the first variant shown in full lines, both felt belts 11 and 12 run together with the paper web in between up to the first suction guide roller 23a. If necessary, this can have a pre-suction zone 23b, which lies in front of the point where the two felts run onto the suction guide roller. The top felt then runs over a guide roller 18a and the further guide rollers 18 back to the take-off suction roller 16.
  • the two felt belts 11 and 12 separate shortly behind the outlet from the extended press nip 19. This is aimed at to rewet the press nip 19 behind the press nip Reduce paper web from the top felt 12 as much as possible.
  • the press shoe 14b according to FIG. 3 (as known per se from DE-OS 38 08 293):
  • the press shoe 14a is divided into an upper part 34 and a lower part 35 acting as a piston.
  • the latter is shown in FIG a pressure chamber 32 arranged; This is a recess of the fixed support body 31. Sealing strips and associated sealing strip supports 38 and 39 are used to guide the press shoe and to seal the pressure chamber 32.
  • the middle part of the sliding surface 33 of the press shoe upper part 34 forms the concave-shaped contact surface with the width b.
  • the press shoe upper 34 has a convexly curved guide surface 36.
  • the radius of curvature K thereof can be approximately equal to the radius R of the orbit of the press cover 14a.
  • Air can enter the upper felt 12 between the positions A and B, so that the paper web 9 safely detaches from the upper felt 12 at the point B and moves with the lower felt (transfer felt 11) (in the direction of the suction guide roller 23a, FIG. 2).
  • the width of the guide surface 36 (in the direction of web travel) is designated by d.
  • Fig. 4 differs from Fig. 1 in that there is no top felt in the press.
  • the tubular press jacket 14a of the extended-nip press roll 14 assumes the function of the second belt (provided according to claim 1).
  • the non-rotating (radially displaceable) press shoe 14b can be replaced by a rotatable roller body 46, as indicated by dash-dotted lines.
  • the transfer felt 11 is diverted behind the press nip 19 without the web 9, namely past a pipe suction device 43 and via an auxiliary guide roller 42 and finally back to the one designed as a suction roller Separating device 17. This is arranged such that the inflatable press jacket 14a forms a small looping zone on the suction roll 17.
  • a take-off suction roll 15 ' is provided in the loop of the transfer felt 11, which ensures that the web 9 changes from the preceding felt belt 8 to the transfer felt 11.
  • the bottom felt 11 of the last press 13, 14 has the function of the transfer felt.
  • the arrangement is such that the top felt 11 'has the function of the transfer felt, the top roller being designed as an extended-nip press roller 14.
  • the bottom felt is designated 12 '.
  • the press shoe 14b can in turn be designed according to FIG. 3, so that the two felt belts 11 'and 12' separate at the outlet end of the press shoe.
  • scrapers 40 are indicated, which rest on the free part of the cylinder surfaces. Such scrapers are also present in the construction according to FIGS. 1, 2 and 4, but are omitted in the drawing.
  • hot air blow boxes 41 are also indicated, which blow hot air onto the paper web at the suction guide rollers 24 and which can additionally extract exhaust air.
  • Fig. 6 differs from Fig. 5 only in that - similar to Fig. 2 - the lower roll is designed as an extended-nip press roll 14. Behind the press nip, the transfer felt (top felt 11 ') without the web 9 is guided via two auxiliary guide rollers 44 and 45 to a separating device 17' designed as a take-off suction roller.
  • the felt conditioning devices already mentioned above are not shown in FIG. 6.

Landscapes

  • Paper (AREA)
  • Drying Of Solid Materials (AREA)
  • Advancing Webs (AREA)
EP91901763A 1990-02-13 1991-01-15 Anordnung zum überführen einer bahn von der pressen- zur trockenpartie einer papiermaschine Expired - Lifetime EP0468005B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4004331 1990-02-13
DE4004331A DE4004331C1 (enrdf_load_stackoverflow) 1990-02-13 1990-02-13
PCT/EP1991/000049 WO1991012370A1 (de) 1990-02-13 1991-01-15 Anordnung zum überführen einer bahn von der pressen- zur trockenpartie einer papiermaschine

Publications (2)

Publication Number Publication Date
EP0468005A1 EP0468005A1 (de) 1992-01-29
EP0468005B1 true EP0468005B1 (de) 1994-09-07

Family

ID=6400008

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91901763A Expired - Lifetime EP0468005B1 (de) 1990-02-13 1991-01-15 Anordnung zum überführen einer bahn von der pressen- zur trockenpartie einer papiermaschine

Country Status (7)

Country Link
US (1) US5169501A (enrdf_load_stackoverflow)
EP (1) EP0468005B1 (enrdf_load_stackoverflow)
JP (1) JPH04506549A (enrdf_load_stackoverflow)
AT (1) ATE111169T1 (enrdf_load_stackoverflow)
CA (1) CA2050894A1 (enrdf_load_stackoverflow)
DE (2) DE4004331C1 (enrdf_load_stackoverflow)
WO (1) WO1991012370A1 (enrdf_load_stackoverflow)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6049999A (en) 1987-02-13 2000-04-18 Beloit Technologies, Inc. Machine and process for the restrained drying of a paper web
US5404653A (en) 1987-02-13 1995-04-11 Beloit Technologies, Inc. Apparatus for drying a web
US5507104A (en) 1987-02-13 1996-04-16 Beloit Technologies, Inc. Web drying apparatus
US5639351A (en) * 1991-12-23 1997-06-17 Valmet Corporation Press section of a paper machine, in particular for printing paper qualities
FI98844C (fi) * 1991-12-23 1997-08-25 Valmet Paper Machinery Inc Paperikoneen puristinosa, etenkin painopaperilaaduille
DE4407405C2 (de) * 1994-03-05 2000-03-16 Voith Sulzer Papiermasch Gmbh Trockenpartie
FI110440B (fi) * 1996-04-04 2003-01-31 Metso Paper Inc Rainan siirto paperikoneen kaksihuopaisesta viimeisestä puristinnipistä seuraavalle kuivatusosalle
FI106806B (fi) * 1997-05-30 2001-04-12 Metso Paper Inc Paperikoneen tai kartonkikoneen kuivatusosa ja menetelmä rainan siirrossa paperikoneen/kartonkikoneen kuivatusosalla
DE19744341A1 (de) 1997-10-07 1999-04-15 Voith Sulzer Papiertech Patent Papiermaschine
AU5166799A (en) 1998-08-04 2000-02-28 Valmet Corporation Method and arrangement for handling paper or cardboard webs
DE19955029A1 (de) * 1999-11-16 2001-05-17 Voith Paper Patent Gmbh Pressenanordnung
WO2016042198A1 (en) * 2014-09-15 2016-03-24 Upm-Kymmene Corporation Process to manufacture low weight high quality paper for use as a support layer of a release! liner with a belt assembly

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1868617A (en) * 1929-08-17 1932-07-26 John D Tompkins Method of and apparatus for making paper
US3250019A (en) * 1962-09-10 1966-05-10 Edward D Beachler Dryer felt
US3981084A (en) * 1972-06-19 1976-09-21 Fort Howard Paper Company Closed draw transfer system with gaseous pressure direction of web
DE2323574C3 (de) * 1973-05-10 1976-01-08 J.M. Voith Gmbh, 7920 Heidenheim Trockenpartie für Papiermaschinen
FI770542A7 (fi) * 1977-02-18 1978-08-19 Valkama P J Pressparti foer avlaegsning av vatten ur fiberbana
US4483745A (en) * 1982-09-29 1984-11-20 Beloit Corporation Method and apparatus of sheet transfer using a nonporous smooth surfaced belt
DE3328162C2 (de) * 1983-08-04 1986-02-20 J.M. Voith Gmbh, 7920 Heidenheim Papiermaschine
US4561939A (en) * 1984-03-26 1985-12-31 Beloit Corporation Extended nip press arrangement
FI850087L (fi) * 1985-01-08 1986-07-09 Valmet Oy Foerfarande och anordning samt remkomponent foer utjaemning av presstrycket i pressnypet av en pappersmaskin.
EP0346659B1 (en) * 1988-06-13 1993-08-11 Appleton Mills Papermaking machine in which the paper web is supported in the draw between the press and dryer sections

Also Published As

Publication number Publication date
JPH04506549A (ja) 1992-11-12
US5169501A (en) 1992-12-08
EP0468005A1 (de) 1992-01-29
CA2050894A1 (en) 1991-08-14
DE4004331C1 (enrdf_load_stackoverflow) 1991-04-18
WO1991012370A1 (de) 1991-08-22
ATE111169T1 (de) 1994-09-15
DE59102820D1 (de) 1994-10-13

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