EP1985751A2 - Partie sèche d'une machine à papier - Google Patents

Partie sèche d'une machine à papier Download PDF

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Publication number
EP1985751A2
EP1985751A2 EP08155002A EP08155002A EP1985751A2 EP 1985751 A2 EP1985751 A2 EP 1985751A2 EP 08155002 A EP08155002 A EP 08155002A EP 08155002 A EP08155002 A EP 08155002A EP 1985751 A2 EP1985751 A2 EP 1985751A2
Authority
EP
European Patent Office
Prior art keywords
fibrous web
web
drying
machine according
metal strip
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Withdrawn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
EP08155002A
Other languages
German (de)
English (en)
Other versions
EP1985751A3 (fr
Inventor
Tri Chau-Huu
Roland Mayer
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 Patent 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 Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1985751A2 publication Critical patent/EP1985751A2/fr
Publication of EP1985751A3 publication Critical patent/EP1985751A3/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Withdrawn legal-status Critical Current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
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • 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
    • D21F5/004—Drying webs by contact with heated surfaces or materials
    • 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
    • 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
    • D21F5/048—Drying on cylinders on two or more drying cylinders in combination with other heating means
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/0066—Calenders; Smoothing apparatus using a special calendering belt

Definitions

  • the invention relates to a machine for producing a fibrous web, in particular paper, board or tissue web according to the preamble of patent claim 1 and a method for producing a fibrous web, in particular paper, board or tissue web according to the preamble of patent claim 30.
  • the paper web runs in the press section in one or both sides contact with a press felt through one or more press nips. Due to the rough surface of a press felt, the side of the paper web which is brought into contact with the press felt by the press nip gets a relatively rough surface.
  • the object of the invention is to provide a machine improved with respect to the abovementioned disadvantages and an improved method for producing a fibrous web.
  • a machine for producing a fibrous web with a dryer section which comprises one or more drying groups, each with a plurality of heated drying cylinders, which are looped by the fibrous web, wherein the fibrous web has a first and a second side and so by at least one of Drying is performed that only the first side of the fibrous web, ie not the second side of the fibrous web with which drying cylinders of this dryer group is in contact.
  • This is a so-called single-row drying group.
  • the machine according to the invention is characterized in that in the web running direction immediately after this drying group, a combined smoothing and drying device is arranged, which comprises a heated metal strip on which the fibrous web is performed in sections.
  • the combined smoothing and drying device further comprises means by means of which the fibrous web is pressed onto the metal strip. Furthermore, the web guide of the fibrous web in the combined smoothing and drying device is such that the fibrous web is in contact only with its second side, ie not with its first side, with the metal strip.
  • the invention provides a machine for producing a fibrous web which has the advantages of a single-tier drying group such as increased process stability without having to accept its disadvantages such as two-sidedness of the paper web or curl tendency because the other, ie not dried on the drying cylinders side of the paper web, is dried and smoothed on the heated metal strip.
  • An advantage of the invention is also in the leadership of the fibrous web on the metal strip. As a result, it can not come in the case of a tear of the fibrous web to a stowage of the fibrous web whose removal often brings long downtime with view. By guiding the fibrous web on the heated metal strip, the process stability is thus further increased.
  • the means for pressing the fibrous web on the metal strip comprise a supporting band acting on the first side of the fibrous web, in particular a permeable supporting band such as a drying wire, by means of which the fibrous web is pressed against the metal band.
  • the force for pressing the fibrous web against the metal strip is in this case generated essentially by the tensile stress under which the support belt is.
  • the support band has a rough surface compared to the metal band.
  • the metal strip is also preferably impermeable.
  • a drying group is arranged, through which the fibrous web is again guided so that the fibrous web is in contact only with its first pages with the drying cylinders of this dryer group.
  • a machine in which the first side of the fibrous web is dried and smoothed in the various single-row dryer sections of the dryer section by their direct contact with the drying cylinders and the second side of the fibrous web by their direct contact with the heated metal strip and by their pressing the heated metal strip is dried and smoothed, whereby the two-sidedness of the fibrous web produced only by the drying of the first side is compensated.
  • the machine according to the invention has several combined smoothing and drying devices and in each smoothing and drying device of the dryer section, the fibrous web is passed through the smoothing and drying device, that only the second side of the fibrous web in contact with the respective metal band is.
  • Such a configuration may, for example, after each single-row dryer section of the dryer section provide a combined smoothing and drying device according to the invention.
  • the means for pressing the fibrous web against the heated metal strip further comprise at least one roller, which is so wrapped by the support belt, the metal strip and the fibrous web guided therebetween so that due to the tensile stress of the support belt a Pressing force is exerted on the guided between the metal strip and the support belt fibrous web.
  • the at least one roller wrapped by the metal strip is heated, wherein the metal strip is in contact with the heated roller in the area of contact with the belt, i. is in direct contact, so that the metal strip is at least substantially heated by the direct contact with the heated roller and the associated heat transfer.
  • the metal strip then transfers its heat to the fibrous web, whereby it is dried from its second side.
  • the metal strip is heated by means of a heating device, for example by thermal radiation or inductively.
  • the metal strip is heated in a section in which the metal strip does not wrap around a heated roll.
  • the heating device can have a plurality of heating zones arranged side by side in the cross-machine direction and independently controllable.
  • a further preferred embodiment of the invention provides that in at least one combined smoothing and drying device, the metal strip wraps around a plurality of successive heated rollers in sections.
  • the smoothing and drying effect can be significantly increased. It is conceivable, for example, to arrange such a smoothing and drying device comprising several heated rolls after a plurality of directly consecutive drying groups, in which only the first side of the fibrous web was in contact with the drying cylinders.
  • a concrete embodiment of the invention provides that the at least one heated Roller has a diameter of 2 meters or more, preferably 3 meters or more.
  • the fibrous web is guided by means of a permeable sieve over the heated drying cylinders of the drying and drying device immediately preceding drying group that only the second side of the fibrous web is in contact with the permeable sieve.
  • This configuration usually corresponds to the web guide in a single tier dryer group and has the great advantage that the fibrous web is constantly on the same permeable wire, i.d.R. Drying wire, is supported.
  • a web guide roller contacting the metal strip at a contact point is arranged, by means of which the fibrous web is transferred from the immediately preceding dryer group to the metal web.
  • a concrete embodiment provides in this context, for example, before that the web guide roller is arranged instead of the last drying cylinder of the immediately preceding dryer group.
  • a pressure roller is arranged, which forms a nip with the web guide roll through which the fibrous web is guided together with the metal strip.
  • the web guide roller is wrapped in sections of the fibrous web and the permeable screen of the immediately preceding dryer group, wherein the permeable screen removed before the transfer of the fibrous web on the heated metal strip of the fibrous web and the pulp subsequently to the transfer to the metal strip is continued without the sieve on the web guide roll.
  • the fibrous web is in this case with its first side with the web guide roller and with its second side with the permeable sieve of the immediately preceding dryer group in touch.
  • the web guide roller has a suction zone. Consequently, the fibrous web is held on the web guide roll by the suction zone, after the permeable sieve, as a rule dryer fabric, has been removed from the fibrous web.
  • suction zone of the web guide roll is arranged substantially between the acceptance point and the transfer point.
  • suction zone extends substantially from the delivery point to the transfer point.
  • the web guide roll has a blowing zone, which supports the transfer of the fibrous web from the web guide roll to the heated metal strip.
  • the blowing zone is arranged after the suction zone.
  • a transfer scraper attached to the web guide roll and / or at least one air nozzle acting on the web guide roll is provided.
  • the jacket of the web guide roll is coated with a screen stocking or is formed from sintered material.
  • a further concrete embodiment of the invention provides that in the web running direction after the common wrapping of the at least one heated roller through the support belt, the fibrous web and the metal strip, the metal strip first removed from the fibrous web and the fibrous web subsequently on the permeable Supporting belt is continued.
  • This configuration is used with great advantage in a combined smoothing and drying device associated with a downstream dryer section as seen in the web running direction, since in a rear dryer section the fibrous web is already relatively dry and thus follows the rougher support belt.
  • a vacuum device is provided which is mounted on the Is arranged facing away from the fibrous web side of the support belt.
  • the vacuum device is a Saugumlenkwalze, which is wrapped in sections of the support band and in this case is in contact with the support band.
  • the fibrous web is transferred from the permeable support belt onto a permeable screen of the dryer group immediately following in the web running direction, that the fibrous web is only in contact with the drying cylinders of the following dryer group with its first side and the fibrous web only with its second side in contact with the permeable screen of the subsequent drying group.
  • the combined smoothing and drying device is associated with a front dryer group seen in the web running direction, there is the problem that the fibrous web is still relatively moist and therefore sticks to the smooth metal band rather than to the permeable and relatively rough support band.
  • the fibrous web and the metal strip Support belt first removed from the fibrous web and the fibrous web is continued on the metal strip.
  • the fibrous web in the web running direction first of the metal strip on a guided around a plurality of guide rollers permeable transfer screen is transferred and then the fibrous web is transferred from the transfer screen on a permeable sieve of immediately downstream arranged in the running direction drying group that the fibrous web is only with the first side in contact with the drying cylinders of the immediately following dryer group and the other side of the fibrous web in contact with the permeable sieve of the following drying group.
  • a fibrous web is guided over the heated drying cylinder of at least one drying group such that only the first side of the fibrous web is in contact with the drying cylinders of this drying group.
  • the fibrous web is further performed immediately after drying in the drying group sections on a heated metal strip and thereby pressed against the metal strip, wherein the fibrous web is guided such that the fibrous web is in contact only with its second side with the metal strip.
  • FIG. 1 shows the dryer section 1 of a machine according to the invention for producing a fibrous web 7 in the region of a combined smoothing and drying device 3, which is arranged between two immediately successive drying groups 2 and 4.
  • permeable means that an object is permeable to water and gas.
  • fibrous web is in contact with a roll or with a cylinder, it is always meant that the fibrous web is in contact with the shell of the cylinder or the roll is.
  • the drying group 2 has a plurality of heated drying cylinders 5 and guide rollers 6 (of which only the last in the web running direction can be seen).
  • the drying cylinder 5 and the guide rollers 6 are alternately wrapped in such a way by the fibrous web 7 that the fibrous web 7 is only in contact with the drying cylinders 5 of the dryer group 2 with their first side 8.
  • the fibrous web 7 is further guided over the heated drying cylinder 5 by means of a permeable sieve formed as a dryer fabric 10 so that the fibrous web 7 is in contact with the dryer fabric 10 only with its second side 9.
  • the drying group 4 also has a plurality of heated drying cylinders 11 and guide rollers 12 (of which only the first can be seen in the web running direction).
  • the drying cylinder 11 and the guide rollers 12 are alternately wrapped in such a way by the fibrous web 7, that even in the drying group 4, the fibrous web 7 is in each case only with the first page 8 with the drying cylinders 11 of this drying group 4 in touch.
  • the fibrous web 7 is further guided by means of a permeable sieve 13 formed asnicsieb so over the heated drying cylinder 11 in the web running direction L of the smoothing and drying device 3 immediately after ordered drying group 4 that the fibrous web 7 only with the second side. 9 in contact with the drying wire 13.
  • the combined smoothing and drying device 3 is arranged in the web running direction L immediately after the drying group 2.
  • the combined smoothing and drying device 3 comprises an impermeable heated metal strip 14, on which the fibrous web 7 is guided in sections and which wraps around a heated roller 16 and a deflection roller 15 in a loop.
  • the heated roller 16 has a diameter of 3 meters in the illustrated embodiment.
  • the combined smoothing and drying device 3 further comprises a permeable support belt 17 acting on the first side 8 of the fibrous web 7, which wraps around the heated roller 16 and by means of which the fibrous web 7 is pressed against the heated metal belt 14, the web guide of the fibrous web 7 in FIG the combined smoothing and Drying device 3 is such that the fibrous web 7 is in contact only with its second side 9 with the metal strip 14.
  • the support band is presently designed as a dryer.
  • the heated roller 16 is wrapped in such a way by the support belt 17, the metal strip 14 and the fibrous web guided therebetween 7 that the metal strip 14 with the heated roller 16 in contact and due to the tension of the support belt 17, a pressing force on the between the metal strip 14 and the support belt 17 guided fibrous web 7 is exercised.
  • the support belt 17 is further guided in a wire loop over a number of guide rollers 26.
  • the dryer section 1 is designed such that in each drying group of the dryer section 1, the fibrous web 7 is guided through the respective drying group, that the fibrous web 7 is only with the first side 8 in contact with the drying cylinders of the respective drying group.
  • the metal strip 14 additionally by heat radiation, which is generated by an infrared radiator 24, heated in the web direction of the wrap around after ordered section. As a result, the dry content of the fibrous web is increased, so that it can be easily removed from the smooth and impermeable metal strip 14.
  • a pressure roller 20 is arranged, which forms a nip 18 with the web guide roller 19 through which the fibrous web 7 is guided together with the metal strip 14. In the present case, therefore, the abovementioned contact point 18 forms the nip 18.
  • the web guide roll 19 has a suction zone 21, which supports the removal of the dryer fabric 10 from the fibrous web 7 and / or the continuation of the fibrous web 7 on the web guide roll 19.
  • the suction zone 21 extends substantially from the delivery point to the transfer point and generates a negative pressure of at least 2000Pa.
  • the web guide roll 19 also has a blowing zone 22, which supports the transfer of the fibrous web 7 from the web guide roll 19 to the heated metal strip 14.
  • the blowing zone 22 is arranged downstream of the suction zone 21.
  • an employee scraper 23 attached to the web guide roll 19 is provided, which supports the transfer of the fibrous web 7 from the web guide roll 19 to the heated metal strip 14.
  • the dryer group 2 shown is one which is arranged in the last third of the dryer section 1. Therefore, in the web running direction L is considered, after the common wrapping of the heated roller 16 by the support belt 17, the fibrous web 7 and the metal strip 14, the metal strip 14 first removed from the fibrous web 7 and the fibrous web 7 then continued on the permeable support belt 17.
  • the decrease of the fibrous web 7 from the metal strip 14 and the continuation of the fibrous web 7 on the permeable support belt 17 is in this case supported by a trained as Saugumlenkwalze 25 vacuum device, which on the of the fibrous web 7 facing away from the support band 17 is arranged.
  • the fibrous web 7 is transferred from the support belt 17 to the dryer wire 13 of the immediately following in Brulaufrochtung L drying group 4 by means of a Saugumlenkwalze 27 so that the fibrous web 7 is only with the first page 8 in contact with the drying cylinders 11 of the dryer group 4 whereas the second side 9 of the fibrous web 7 in contact with the drying wire 13.
  • FIG. 2 shows the dryer section 1 of the machine according to the invention in the section of the first third of the dryer section 1 in the range of another embodiment of a combined smoothing and drying device 28 which is arranged between two immediately successive drying groups 2 and 4.
  • drying groups should only serve to distinguish them as the combined smoothing and drying device 28 before and after and not with regard to their exact position in the drying section 1.
  • the combined smoothing and drying device 28 of the FIG. 2 differs from the combined smoothing and drying device 3 of the FIG. 1 merely by the fact that viewed in the web running direction L, after the common wrapping of the heated roller 16 by the support belt 17, the fibrous web 7 and the metal strip 14, the support belt 17 first removed from the fibrous web 7 and the fibrous web 7 is then continued on the metal strip 14 , wherein the fibrous web 7 is subsequently transferred by means of a Saugumlenkwalze 32 of the metal strip 14 to a guided around a plurality of guide rollers 30 permeable transfer screen 31 and the fibrous web 7 is then transferred from the transfer screen 31 on the dryer wire 13 of the immediately following in the web running direction drying group 4 in that the fibrous web 7 is in contact with the drying cylinders 11 of this drying group 4 only with its first side 8 and the second side 9 of the fibrous web 7 is in contact with the drying wire 13 of the following drying group 4.
  • FIG. 3 shows the drying section 1 of the machine according to the invention in the range of another embodiment of a combined smoothing and drying device 33, which is arranged between two immediately successive drying groups 2 and 4.
  • drying groups should only serve to distinguish them as the combined smoothing and drying device 33 above and below and not with regard to their exact position in the drying section 1.
  • the combined smoothing and drying device 33 of FIG. 3 differs from the combined smoothing and drying device 3 of the FIG. 1 merely in that it comprises two successive heated rollers 16, which are respectively wrapped in sections by the metal strip 14, wherein the fibrous web 7 is in contact only with its second side 9 with the metal strip 14.

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  • Paper (AREA)
  • Drying Of Solid Materials (AREA)
EP08155002A 2007-04-28 2008-04-23 Partie sèche d'une machine à papier Withdrawn EP1985751A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200710020179 DE102007020179A1 (de) 2007-04-28 2007-04-28 Trockenpartie einer Papiermaschine

Publications (2)

Publication Number Publication Date
EP1985751A2 true EP1985751A2 (fr) 2008-10-29
EP1985751A3 EP1985751A3 (fr) 2009-12-16

Family

ID=39627469

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08155002A Withdrawn EP1985751A3 (fr) 2007-04-28 2008-04-23 Partie sèche d'une machine à papier

Country Status (2)

Country Link
EP (1) EP1985751A3 (fr)
DE (1) DE102007020179A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115698424A (zh) * 2020-06-02 2023-02-03 福伊特专利有限公司 用于制造能沿着横向拉伸的纤维料幅的方法和机器

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI972063A7 (fi) * 1996-05-15 1997-11-16 Voith Sulzer Papiermasch Gmbh Laitteisto materiaalirainan valmistamiseksi
US6076281A (en) * 1997-03-03 2000-06-20 Valmet Corporation Web finishing section in a paper machine
FI20065447A7 (fi) * 2006-06-28 2007-12-29 Metso Paper Inc Paperi- tai kartonkikoneen puristinosa

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115698424A (zh) * 2020-06-02 2023-02-03 福伊特专利有限公司 用于制造能沿着横向拉伸的纤维料幅的方法和机器

Also Published As

Publication number Publication date
EP1985751A3 (fr) 2009-12-16
DE102007020179A1 (de) 2008-10-30

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