EP0802276A2 - Machine pour la fabrication d'une bande de matériau - Google Patents

Machine pour la fabrication d'une bande de matériau Download PDF

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Publication number
EP0802276A2
EP0802276A2 EP97102550A EP97102550A EP0802276A2 EP 0802276 A2 EP0802276 A2 EP 0802276A2 EP 97102550 A EP97102550 A EP 97102550A EP 97102550 A EP97102550 A EP 97102550A EP 0802276 A2 EP0802276 A2 EP 0802276A2
Authority
EP
European Patent Office
Prior art keywords
conveyor belt
drying
material web
web
group
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Withdrawn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
EP97102550A
Other languages
German (de)
English (en)
Other versions
EP0802276A3 (fr
Inventor
Karl Dr. Steiner
Tri Chau-Huu
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 EP0802276A2 publication Critical patent/EP0802276A2/fr
Publication of EP0802276A3 publication Critical patent/EP0802276A3/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Withdrawn legal-status Critical Current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
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders

Definitions

  • the invention relates to a machine for producing a material web, in particular paper or cardboard web, with a drying group having a number of drying cylinders and web guide rollers, as well as a method for producing a material web, in particular paper or cardboard web, according to the preamble of claim 8.
  • the web guide roller is cooled inside by means of a cooling water flow and is accordingly constructed in a complex manner.
  • the costs for the machine for producing the material web and its operating costs are relatively high. It has also been found that the specific drying performance of such drying groups can still be improved.
  • the invention is therefore based on the object of creating a machine and a method of the type mentioned here which do not have these disadvantages mentioned.
  • An embodiment of the machine is particularly preferred, which is characterized in that at least one drying group is designed as a two-row drying group, within which the center points of the drying cylinders are arranged in two planes arranged at a distance from one another, between which a transfer area is provided, through which the material web runs in a free train, whereby the drying cylinders of a drying group, which are arranged in the first and second levels, are each assigned a separate conveyor belt guided in a closed loop, which meanders around the drying cylinders together with the material web, and that the material web during the transition from a drying cylinder of the first level to a drying cylinder of the second level through the transfer area in which the air humidity is approximately in equilibrium with the moisture of the material web.
  • the material web is dried in an area in which the material web lies against a drying cylinder and is arranged between the drying cylinder and the conveyor belt. This creates a temperature gradient from the drying cylinder to the material web Conveyor belt, whereby the moisture escapes from the material web and this is thereby dried.
  • the fact that the conveyor belt which is preferably pretensioned with 2 kN / m to 4 kN / m, presses and holds the material web against the drying cylinder, prevents the material web from shrinking. This means that the material web has practically the same properties over its entire width, which increases its quality.
  • An embodiment of the machine is also preferred in which the conveyor belt is cooled before it runs onto the first drying cylinder of a drying group and / or within a drying group. Due to the heat transport from the material web to the conveyor belt, it heats up as it passes through the drying group and is cooled before it is returned to the beginning of the drying group. With good heat transport from the material web to the conveyor belt and / or with a relatively large number of drying cylinders within the drying group, provision can be made to cool the conveyor belt within the drying group, thereby increasing the degree of drying of the material web guided through the drying group.
  • an embodiment of the machine is preferred, which is characterized in that the conveyor belt is cooled by at least one suction device and / or at least one blowing device.
  • the cooling air flow acting on the conveyor belt dissipates the heat absorbed by the conveyor belt on the one hand and carries the heat on the other condensed moisture on the conveyor belt.
  • An embodiment of the machine is particularly preferred in which the side of the conveyor belt facing the material web is more hydrophobic than the side facing away from the material web and that the side of the conveyor belt facing away from the material web is hydrophilic.
  • the side of the conveyor belt that is in contact with the material web is thus moisture-repellent, while the opposite side of the conveyor belt — like a sponge — consists of a moisture-attracting material. This leads to an accelerated removal of the moisture emerging from the web from the contact area between the conveyor belt and the material web. A worsened heat dissipation from the material web by a forming, insulating moisture layer is practically excluded, which improves the specific drying performance of the dryer section.
  • Figure 1 shows part of a paper making machine 1, namely a dryer group 3 arranged in a dryer section.
  • the dryer group 3 here comprises two subgroups 5 and 7.
  • the first, lower subgroup 5 are assigned drying cylinders 9 to 13, the center of which is on an imaginary one Level E1 are arranged.
  • the drying cylinders 9 to 13 of the sub-group 5 are arranged at a distance from one another in a row, so that a single-row sub-group is formed here.
  • the sub-group 5 also has a number of deflection rollers 15 to 25, around which an endless conveyor belt 27 is guided in a loop such that it partially surrounds the drying cylinders 9 to 13.
  • Drying cylinders 29 to 33 are arranged within the second, upper subgroup 7, the center points of which are arranged in a plane E2 spaced apart from the plane E1 in the vertical direction.
  • the drying cylinders of subgroup 7 are also arranged side by side, so that a second single-row subgroup is formed.
  • a conveyor belt 35 is brought to the drying cylinders 29 to 33 of sub-group 7 by means of deflection rollers 37 to 47 in such a way that the drying cylinders are looped around in regions by the conveyor belt.
  • the two subgroups are combined to form a two-tier dryer group.
  • a transfer area 49 is formed, in which a material web 51 is transferred from one sub-group to the other.
  • the material web 51 passes through the drying group from left to right, as indicated by a double arrow.
  • the material web 51 is guided alternately around the drying cylinders of subgroups 5 and 7, after the expiry From a drying cylinder, the material web 51 runs in a free train through the transfer area 49 onto the subsequent drying cylinder.
  • the material web 51 includes pocket-like spaces within the transfer region 49, in which, due to the moisture carried along with the material web, there is a relatively high atmospheric humidity which is approximately in equilibrium with the moisture of the material web. If necessary, special devices can also be provided with which the moisture in the pockets can be adjusted.
  • a first cooling device 53 Arranged within the loop formed by the conveyor belt 35 is a first cooling device 53, which is designed here as a suction box 55 which extends across the width of the papermaking machine 1 and which acts on the conveyor belt 35 with a cooling air stream, preferably with dry air.
  • the conveyor belt 27 of subgroup 5 is also assigned a cooling device 57, which is designed here as a blow box 59 and acts on the conveyor belt over its entire width with preferably dry air.
  • the blow box 59 is arranged outside the loop formed by the conveyor belt 27.
  • the air flow emerging from it is directed essentially in the direction of the drying cylinders 9 to 13 of subgroup 5. The air flow penetrates through the conveyor belt into the space formed by the closed loop of the conveyor belt 27.
  • a suction channel 61 is arranged, which is part of a suction device, not shown is.
  • the conveyor belt returned from the end of the sub-group 5 by means of the deflection rollers is acted upon by the blow box 59 of the second cooling device 57 with a relatively cool and dry air flow.
  • the cooling air flow passes through the porous conveyor belt and carries heat and condensate deposited on the conveyor belt 27 as vapor from it.
  • the heated and moist air stream is sucked off by means of the suction channel 61.
  • the material web 51 runs here together with the conveyor belt 27 onto the first drying cylinder 9 of subgroup 5 or drying group 3. While moving around it, the cooler conveyor belt 27 extracts heat and moisture from the web.
  • the conveyor belt 27 is guided by means of the deflection roller 17 directly to the subsequent drying cylinder 11 of the subgroup 5, while the material web 51 passes through the transfer area 49 in a free pull and together with the conveyor belt 35 onto the first drying cylinder 29 of the subgroup 7 accumulates. Since the air in the transfer area 49 has approximately the same moisture as the material web 51, it cannot excrete its moisture, that is to say it cannot dry during the transfer.
  • the web of material 51 releases heat and moisture to the conveyor belt 35 of the subgroup 7 during the circulation around the drying cylinder 29, as a result of which the latter is heated and moistened.
  • the conveyor belt 35 is forwarded directly to the drying cylinder 31 of the subgroup 7 by means of the deflection roller 39, while the material web again passes through the transfer area 49 and runs onto the drying cylinder 11 of the subgroup 5 together with the conveyor belt 27.
  • the drying of the material web 51 is also interrupted again during the passage through the moist transfer area 49.
  • the material web 51 is - as described above - passed through the drying group 3 in this way.
  • the temperature of the conveyor belts 27 and 35 increases with each common circulation of the material web 51 by a drying cylinder and can be, for example, 70 ° C. at the end of the drying group 3.
  • the conveyor belts 27 and 35 are returned by means of deflection rollers past the cooling devices 55 and 59 to the beginning of the drying group 3.
  • the conveyor belt 27 of subgroup 5 is blown with air, whereby heat and moisture are removed from the conveyor belt.
  • the cooling of the conveyor belt is, for example, ⁇ 30 K, preferably 20 K.
  • the conveyor belt 27 cooled in this way is fed again to the first drying cylinder 9 of subgroup 5 or drying group 3 by means of the deflection roller 15.
  • the conveyor belt 35 of the subgroup 7 is by means of the suction box 55 sucked, whereby the air sucked in from the environment removes the heat and moisture from the conveyor belt.
  • the cooling is in a range ⁇ 30 K, preferably 20 K.
  • FIG. 2 shows a greatly enlarged sectional view of an embodiment of the conveyor belt 27, on which the material web 51 lies.
  • the conveyor belt 27 here has a fabric-like structure which is produced by means of individual threads 63 intertwined with one another.
  • the side of the conveyor belt 27 facing the material web 51 or the thread-like fibers 65 adjoining it are produced from a material which has hydrophobic properties, that is to say is water-repellent.
  • the fibers 65/1 arranged on the side of the conveyor belt 27 facing away from the material web 51 are formed by a hydrophilic material, which at least has an attractive effect on the water and preferably absorbs it.
  • the moisture emerging from the material web 51 is transported in the direction of the heat gradient (arrow) and is deposited as condensate on the cooler conveyor belt 27, the hydrophobic fibers 65 repelling the liquid droplets and pushing them toward the side of the conveyor belt 27 facing away from the material web 51.
  • the hydrophilic fibers 65/1 reinforce this effect and quasi attract the condensate.
  • a conveyor belt with such properties also has the advantage that the moisture absorbed can be discharged very easily since it is already accumulating on one side of the conveyor belt.
  • the conveyor belt 27 is fed to the blow box 59 of the cooling device 57 so that the hydrophobic side of the conveyor belt faces the blow box 59 so that the air stream emerging from it can easily discharge the moisture bound in the conveyor belt 27.
  • This easy discharge is achieved in that the moisture has already accumulated on the hydrophilic side of the conveyor belt and does not have to be pressed through the entire conveyor belt by the air flow.
  • the Conveyor belt 27 is simultaneously cleaned by the air flow, which means that conventional conveyor belt cleaning devices can be dispensed with.
  • the conveyor belt 35 of subgroup 7 can be constructed in the same way, that is to say with a hydrophobic and a hydrophilic side, like the conveyor belt 27 described above in FIG. 2. Since the cooling device 57 of the conveyor belt 35 has a suction box 55, the conveyor belt 35 with its hydrophilic side Side supplied to the suction box 55, which in this case also provides easy removal of the moisture.
  • FIG. 3 shows a schematic side view of a further exemplary embodiment of the paper manufacturing machine 1.
  • the same parts are provided with the same reference numerals, so that reference can be made to FIG. 1 for their description.
  • the subgroup 5 'of the dryer section 3' differs from that in FIG. 1 only in that a further drying cylinder 13/1 and a deflection roller 21/1 are arranged within it.
  • a cooling device can be assigned to the conveyor belt 27 of the sub-group 5 'in the area in which the conveyor belt 27 is returned from the end of the sub-group 5' to its beginning, as already explained above.
  • the subgroup 7 'of the drying group 3' also has an additional drying cylinder 33/1 and a further deflection roller 43/1.
  • the conveyor belt 35 is here in the area of the drying cylinder 31, that is to say within subgroup 7 ', is lifted from this and fed via deflection rollers 67 and 69 to a cooling device 71 which comprises a suction box 73 and a blow box 75.
  • a cooling device 71 which comprises a suction box 73 and a blow box 75.
  • the suction box 73 and the blow box 75 are arranged on opposite sides of the conveyor belt. The air stream emerging from the blow box 75 penetrates the conveyor belt 35, cools it down and carries off the moisture bound therein.
  • the suction box 73 is assigned to the blow box 75 in such a way that the moist air stream emerging from the conveyor belt 35 is immediately extracted and discharged from the sub-group 7 '.
  • the conveyor belt is again guided onto the drying cylinder 31 by means of a further deflection roller 77.
  • the cooling of the conveyor belt within the sub-group 7 can be provided if, for example, there is an increased moisture discharge from the material web 51 or if the drying group is designed in a single row.
  • the differential pressure at the respective box can be below 0.1 bar and is, for example, 0.002 bar.
  • the conveyor belts 27 and 35 also referred to as support belts or screens, have a high specific heat capacity, as a result of which they have an increased heat absorption capacity.
  • the amount of air supplied to the blow boxes or discharged from the suction boxes can be controlled via the temperature and / or the humidity of the conveyor belts and is preferably constant over the width of the material web.
  • a blow box for cooling a conveyor belt
  • the individual segments can have separate, separately controllable air connection lines with which the respective cooling air flow can be regulated, as a result of which the conveyor belt is cooled differently over its width and thus the moisture discharge of the material web is different over its width.
  • a cooling device has a plurality of blow boxes connected in series, by means of which air of different moisture can be applied to the conveyor belt, whereby the material web cross profile can be influenced.
  • Such cooling devices for conveyor belts can be used universally for all designs of dryer sections, for example in single-row and double-row dryer sections and in tower dryer sections.
  • FIGS. 1 to 3 The machine explained with reference to FIGS. 1 to 3 is provided with lateral boundary walls which have been omitted from the representations of FIGS. 1 and 3 for reasons of better clarity and which serve to avoid lateral supply and removal of air and moisture. In this way, the pressure and humidity conditions in the machine can be set in a defined manner.

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  • Drying Of Solid Materials (AREA)
  • Paper (AREA)
EP97102550A 1996-04-16 1997-02-18 Machine pour la fabrication d'une bande de matériau Withdrawn EP0802276A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19614887A DE19614887A1 (de) 1996-04-16 1996-04-16 Maschine zur Herstellung einer Materialbahn
DE19614887 1996-04-16

Publications (2)

Publication Number Publication Date
EP0802276A2 true EP0802276A2 (fr) 1997-10-22
EP0802276A3 EP0802276A3 (fr) 1998-06-24

Family

ID=7791354

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97102550A Withdrawn EP0802276A3 (fr) 1996-04-16 1997-02-18 Machine pour la fabrication d'une bande de matériau

Country Status (5)

Country Link
US (1) US5966834A (fr)
EP (1) EP0802276A3 (fr)
CN (1) CN1167856A (fr)
CA (1) CA2202211A1 (fr)
DE (1) DE19614887A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013092151A1 (fr) * 2011-12-22 2013-06-27 Voith Patent Gmbh Procédé de conditionnement d'une bande de séchage circulant sans fin et dispositif de séchage par contact
CN105043056A (zh) * 2012-07-12 2015-11-11 艾博生物医药(杭州)有限公司 一种自动化快速烘干样品接收垫的方法

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19904891C1 (de) * 1999-02-06 2000-08-31 Voith Sulzer Papiertech Patent Kalander
SE517689C2 (sv) * 1999-11-26 2002-07-02 Metso Paper Karlstad Ab Förfarande och torkparti för att vid torkning styra åtminstone bredden hos en löpande, fuktig pappers- eller kartongbana, samt en produkt framställd av en sådan bana
DE10101775A1 (de) * 2001-01-17 2002-07-18 Nexpress Solutions Llc Konditioniervorrichtung zur Veränderung des Feuchtegehalts von Druckträgern
SE532624C2 (sv) * 2008-06-19 2010-03-09 Andritz Technology And Asset Management Gmbh Kylning av en cellulosamassabana
FI124766B (fi) * 2010-06-30 2015-01-15 Valmet Technologies Inc Menetelmä kuiturainan käyristymän hallitsemiseksi ja kuiturainakoneen kuivatusosa
CN103884162B (zh) * 2014-04-13 2016-04-13 泰山体育产业集团有限公司 一种人造草丝除水装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4625430A (en) 1984-06-06 1986-12-02 Valmet Oy Drying section and method in paper machine

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3314162A (en) * 1965-10-19 1967-04-18 Huyck Corp Papermaking apparatus
US4162190A (en) * 1974-04-29 1979-07-24 Scapa-Porritt Limited Paper makers wet felts
GB1502040A (en) * 1975-12-30 1978-02-22 Tampella Oy Ab Method of drying a cardboard or a paper web and drying device for applying this method
FI78755C (fi) * 1988-01-29 1989-09-11 Tampella Oy Ab Foerfarande foer torkning av en kartong- eller pappersbana.
JP2826614B2 (ja) * 1992-01-11 1998-11-18 大蔵省印刷局長 抄紙機の乾燥部ドラムシリンダーにおいて、抄造終了後、ドラムシリンダー温度を急速低下させる方法及び装置
FI97485C (fi) * 1995-02-14 1996-12-27 Valmet Corp Kuivauslaite kuiturainan kuivaamiseksi ja paperikoneen kuivausosa

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4625430A (en) 1984-06-06 1986-12-02 Valmet Oy Drying section and method in paper machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013092151A1 (fr) * 2011-12-22 2013-06-27 Voith Patent Gmbh Procédé de conditionnement d'une bande de séchage circulant sans fin et dispositif de séchage par contact
CN105043056A (zh) * 2012-07-12 2015-11-11 艾博生物医药(杭州)有限公司 一种自动化快速烘干样品接收垫的方法

Also Published As

Publication number Publication date
CN1167856A (zh) 1997-12-17
CA2202211A1 (fr) 1997-10-16
US5966834A (en) 1999-10-19
EP0802276A3 (fr) 1998-06-24
DE19614887A1 (de) 1997-10-23

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