EP0802279A2 - Section de séchage - Google Patents

Section de séchage Download PDF

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Publication number
EP0802279A2
EP0802279A2 EP97103013A EP97103013A EP0802279A2 EP 0802279 A2 EP0802279 A2 EP 0802279A2 EP 97103013 A EP97103013 A EP 97103013A EP 97103013 A EP97103013 A EP 97103013A EP 0802279 A2 EP0802279 A2 EP 0802279A2
Authority
EP
European Patent Office
Prior art keywords
material web
dryer section
drying
dryer
section according
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.)
Withdrawn
Application number
EP97103013A
Other languages
German (de)
English (en)
Other versions
EP0802279A3 (fr
Inventor
Dieter Egelhof
Markus Oechsle
Hans-Jürgen WULZ
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.)
Voith Patent GmbH
Original Assignee
Voith Sulzer Papiermaschinen GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Sulzer Papiermaschinen GmbH filed Critical Voith Sulzer Papiermaschinen GmbH
Publication of EP0802279A2 publication Critical patent/EP0802279A2/fr
Publication of EP0802279A3 publication Critical patent/EP0802279A3/fr
Withdrawn legal-status Critical Current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
    • D21F3/045—Arrangements thereof including at least one extended press nip
    • 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
    • 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

Definitions

  • the invention relates to a dryer section of a machine for producing a material web, in particular a paper or cardboard web, according to the preamble of claim 1.
  • Dryer sections of the type mentioned here are known. It has been found that the degree of dryness and the web properties cannot be optimally adjusted in some cases.
  • a dryer section which has the features mentioned in claim 1. Due to the fact that at least one press device is provided within the dryer section, the degree of drying and the material web properties can be better predetermined.
  • a drying section which has two drying groups, between which a press device is provided.
  • the structure of the drying groups needs such Embodiment not to be changed. This means that existing dryer sections can be converted with relatively little effort.
  • a method is also proposed that includes the features mentioned in claim 15. Because the web of material is subjected to at least one pressing process during the drying process, the degree of drying and the web properties can be better predetermined.
  • An embodiment of the method is particularly preferred, which is characterized in that the material web is pressed and dried alternately several times.
  • the degree of dryness and the material web properties can thus be set particularly precisely.
  • drying section described below can be used universally in connection with machines for producing a material web.
  • this machine is a paper-making machine.
  • the embodiment of a dryer section 1 shown in FIG. 1 has two dryer groups 3 and 5.
  • the first dryer group 3 comprises a number of drying cylinders 7 to 13 and a plurality of web guide rollers 15 and 17.
  • the material web 19, here the paper web becomes meandering, together with a conveyor belt, not shown here in detail, which is also referred to as a sieve or dryer fabric led around the drying cylinders and web guide rollers.
  • the drying cylinders 7 and 9 and 11 and 13 are arranged in two parallel planes E1 and E2, which are at a distance from one another.
  • the web guide rollers 15 and 17 are arranged in a plane E3, which lies between the two planes E1 and E2 of the drying cylinders 7, 9 and 11, 13.
  • the material web 19 is guided in a meandering manner around the drying cylinders and web guide rollers, the bottom side being dried in the area of the drying cylinders 7 and 9 and the top side of the material web 19 in the area of the drying cylinders 11 and 13.
  • the web guide rollers 15 and 17 can be designed as suction rollers.
  • guide rollers 21 to 29 are used.
  • the first guide roller 21 interacts with the first drying cylinder 7, the second guide roller 23 with the drying cylinder 9, the third guide roller 25 with the drying cylinder 11 and the fourth guide roller 27 with the drying cylinder 13.
  • the material web 19 passes from a press device 31 into the drying group 3 and from there, via a second press device 33, into the second drying group 5, which in this example is constructed identically to the first drying group 3.
  • a press device 31 into the drying group 3 and from there, via a second press device 33, into the second drying group 5, which in this example is constructed identically to the first drying group 3.
  • the first press device 31 has three press cylinders 35, 37 and 39.
  • the first press cylinder 35 forms a first press nip with the second press cylinder 37.
  • the latter forms a second press nip with the third press cylinder 39.
  • the material web 19 passes through both press nips.
  • the diameter of the press cylinder 37 is substantially larger than the diameter of the other two press cylinders 35 and 39.
  • the second press device 33 has two press cylinders 41 and 43.
  • the first press cylinder 41 can have a hard surface
  • the second press cylinder 43 of the second press device 33 can have a soft surface.
  • the design of the press equipment 31 and 33 can be freely selected, as can that of the drying groups. It is therefore also possible to design the dryer groups as single-row dryer groups with an overhead conveyor belt or as single-row dryer groups with an alternating conveyor belt. It is also possible to use double-row dryer groups. Finally, it is possible to design dryer groups 3 and 5 differently.
  • the second press device 33 which is provided here at the transition area between the first and second drying groups, can also be arranged within a drying group.
  • several of the press devices described here can be provided within a drying group.
  • Figure 2 shows an embodiment of a dryer section 10 with two dryer groups 30 and 50. Parts that correspond to those in Figure 1 have the same reference numerals, so that the description thereof can be omitted.
  • the material web 19 passes from the first press device 31, which is constructed like the one shown in FIG. 1, to the first drying group 30, which is designed here as a compact two-row drying group and has drying cylinders 7 'and 11' arranged one above the other in two rows, around which the Material web 19 is meandered around together with a conveyor belt, not shown here.
  • the first drying group 30 which is designed here as a compact two-row drying group and has drying cylinders 7 'and 11' arranged one above the other in two rows, around which the Material web 19 is meandered around together with a conveyor belt, not shown here.
  • Back-up rollers 45 and 47 are provided which avoid a free running path. Since the material web 19 is only warmed up in the region of the first dryer group 30 before it reaches the second press device 33, there is no need for evaporation sections here.
  • the second press device 33 is followed by a second drying group 50, which is designed as a single-row drying group purely by way of example and comprises a row of drying cylinders 7 ′′, which are arranged in a row and around which the material web 19 is guided in a meandering manner, in each case between two drying cylinders a web guide roller 11 '' is arranged, which can be designed as a suction roller.
  • a second drying group 50 which is designed as a single-row drying group purely by way of example and comprises a row of drying cylinders 7 ′′, which are arranged in a row and around which the material web 19 is guided in a meandering manner, in each case between two drying cylinders a web guide roller 11 '' is arranged, which can be designed as a suction roller.
  • the second press device 33 is preceded and followed by guide rollers 29 and 29 '.
  • the exemplary embodiment of a dryer section 100 shown in FIG. 3 has, as explained with reference to FIGS. 1 and 2, two press devices 31 and 33.
  • a steaming device 49 is provided between the press devices, which is mounted here on wheels 51 as an example and can be moved out of the area of the dryer section 100. It comprises at least one steam blower box 53, which evaporates the material web 19 from below. It is also conceivable to provide an upper steam blow box 55 which, in addition to or instead of the steam blow box 53, acts on the material web 19 with steam.
  • the second press device 33 is a dryer group 50 downstream, which - as the drying group explained with reference to Figure 2 - is, for example, a single row.
  • the steaming device 49 is characterized by simple operability and simple maintenance. It also builds smaller than the dryer groups 3 and 30, which were explained with reference to Figures 1 and 2.
  • the vapor deposition device 49 can also be exchanged with the drying group 50. It can also be provided in addition to existing drying groups, as explained with reference to FIGS. 1 and 2.
  • FIG. 4 shows a detail from a dryer section, namely a steam blow box 57 of a vapor deposition device 49, which - as seen in the conveying direction of the material web 19 - is arranged downstream of a guide roller 58. It is preferably located in the area of the rising nip N behind the guide roller 58, so that a negative pressure is generated in the material web 19 and the steam of the steam blow box 57 is sucked into the material web 19. With such an arrangement, the vapor deposition device 49 has a particularly intensive effect.
  • a guide roller as shown in Figure 4, can also cooperate with a steam blow box located above the material web 19, provided the guide roller is arranged on the side opposite the material web 19 and the steam of the Steam blower box can act in the rising nip behind the guide roller.
  • FIG. 5 finally shows a further exemplary embodiment of a dryer section 1000 which has two press devices 31 and 33, the structure of which has already been explained with reference to FIGS. 1 and 2.
  • a heating device 59 is provided between the press devices 31 and 33, which has devices on one side of the material web 19 or, as shown here, preferably on both sides of the material web 19, which serve to heat the material web.
  • the heating device 59 can have electric or convection radiators which are steam-heated, for example. It is also conceivable to use gas jets.
  • the heating device 59 is followed by a drying group 50, which is designed here, for example, as a single-row drying group and has drying cylinders 7 ′′, around which the material web is guided in a meandering manner with the aid of web guide rollers 15 ′.
  • the web guide rolls can be designed as suction rolls. It is also conceivable to use further drying cylinders instead of the web guide rolls.
  • the material web is guided through the dryer section within a production machine in order to achieve a certain degree of dryness and a predetermined material profile adjust.
  • the material web properties and the degree of dryness can be adjusted particularly well by combining drying and seizing of the material web.
  • a pressing device is provided within a drying group or between two successive drying groups, which has, for example, three press cylinders with two press nips or which comprises two press cylinders, one of which can have a resilient surface. It is also conceivable to use so-called shoe presses.
  • the viscosity of the moisture bound in the material web can be reduced, so that it can be dewatered particularly well in a subsequent press device.
  • the effectiveness of a subsequent dryer group can be increased by the particularly targeted dewatering within a press device, so that the dryer section as a whole can also be shorter than conventional production machines.
  • the drying section or the method for drying a material web is characterized in that the combination of drying and pressing a material web, using steaming and heating devices, enables optimum dewatering because the viscosity of the material in the web bound moisture can be set very precisely. In this way, it is also possible to set the properties or the profile of the material web precisely or, if necessary, to correct them.
  • the arrangement and sequence of drying, heating and steaming devices as well as press devices can be selected depending on the material properties of the web to be dried.

Landscapes

  • Drying Of Solid Materials (AREA)
  • Paper (AREA)
EP97103013A 1996-04-18 1997-02-25 Section de séchage Withdrawn EP0802279A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19615226A DE19615226A1 (de) 1996-04-18 1996-04-18 Trockenpartie
DE19615226 1996-04-18

Publications (2)

Publication Number Publication Date
EP0802279A2 true EP0802279A2 (fr) 1997-10-22
EP0802279A3 EP0802279A3 (fr) 1998-09-09

Family

ID=7791571

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97103013A Withdrawn EP0802279A3 (fr) 1996-04-18 1997-02-25 Section de séchage

Country Status (4)

Country Link
US (2) US5956864A (fr)
EP (1) EP0802279A3 (fr)
CA (1) CA2202715A1 (fr)
DE (1) DE19615226A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009149481A1 (fr) * 2008-06-11 2009-12-17 Andritz Ag Dispositif et procédé d'essorage d'une bande de matériau fibreux

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19959669A1 (de) * 1999-12-10 2001-06-13 Voith Paper Patent Gmbh Trockenpartie

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3448529A (en) * 1965-07-13 1969-06-10 Scott Paper Co Apparatus for stabilizing paper webs
US4425190A (en) * 1981-05-26 1984-01-10 Beloit Corporation Extended nip shoe for a nip in a papermaking machine
US4874470A (en) * 1988-10-04 1989-10-17 Beloit Corporation Papermaking press section and transfer arrangement to dryer section
US5034095A (en) * 1989-06-01 1991-07-23 Oji Paper Co., Ltd. Apparatus and process for the delignification of cellulose pulp
US4922627A (en) * 1989-09-29 1990-05-08 Albany International Corp. Press drying concept
FI93663C (fi) * 1990-06-06 1995-05-10 Valmet Paper Machinery Inc Menetelmä ja laite erillispuristimella varustetussa paperikoneen puristinosassa
FI89524C (fi) * 1992-05-15 1993-10-11 Yhtyneet Paperitehtaat Oy Foerfarande foer behandling av en pappersbana i torkpartiet av en pappersmaskin
US5372679A (en) * 1992-06-08 1994-12-13 Air Products And Chemicals, Inc. Reactor system for treating cellulosic pulp at a constant upward flow velocity
DE4301750C2 (de) * 1993-01-23 1996-10-10 Voith Gmbh J M Verfahren und Vorrichtung zum Entwässern einer Bahn mittels Pressen
DE9414963U1 (de) * 1994-09-16 1994-11-03 J.M. Voith Gmbh, 89522 Heidenheim Trockenpartie
US5771603A (en) * 1994-09-16 1998-06-30 Voith Sulzer Papiermashinen Gmbh Dryer section
US5632101A (en) * 1994-09-16 1997-05-27 Voith Sulzer Papiermaschinen Gmbh All top-felted single-tier drying section with post drying section curl control
DE19507374C2 (de) * 1995-03-03 1997-01-09 Voith Sulzer Papiermasch Gmbh Trockenpartie
DE19514142C1 (de) * 1995-04-15 1996-07-11 Voith Sulzer Papiermasch Gmbh Preßvorrichtung für eine Papiermaschine
AT403588B (de) * 1996-06-26 1998-03-25 Andritz Patentverwaltung Vorrichtung zur verteilung von suspensionen, insbesondere zellstoffsuspensionen, in einem behälter
DE19629885A1 (de) * 1996-07-24 1998-01-29 Voith Sulzer Papiermasch Gmbh Preßvorrichtung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009149481A1 (fr) * 2008-06-11 2009-12-17 Andritz Ag Dispositif et procédé d'essorage d'une bande de matériau fibreux

Also Published As

Publication number Publication date
US5956864A (en) 1999-09-28
US6131304A (en) 2000-10-17
CA2202715A1 (fr) 1997-10-18
DE19615226A1 (de) 1997-10-23
EP0802279A3 (fr) 1998-09-09

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