DE102005029377A1 - Process and assembly to dry wet web of paper, carton or tissue paper in upright installation with air blower and slightly convex suction hood - Google Patents

Process and assembly to dry wet web of paper, carton or tissue paper in upright installation with air blower and slightly convex suction hood

Info

Publication number
DE102005029377A1
DE102005029377A1 DE200510029377 DE102005029377A DE102005029377A1 DE 102005029377 A1 DE102005029377 A1 DE 102005029377A1 DE 200510029377 DE200510029377 DE 200510029377 DE 102005029377 A DE102005029377 A DE 102005029377A DE 102005029377 A1 DE102005029377 A1 DE 102005029377A1
Authority
DE
Germany
Prior art keywords
hot air
characterized
fibrous web
air dryer
dryer 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Withdrawn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
DE200510029377
Other languages
German (de)
Inventor
Wolfgang 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
Priority to DE200510029377 priority Critical patent/DE102005029377A1/en
Publication of DE102005029377A1 publication Critical patent/DE102005029377A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00Dryer section of machines for making continuous webs of paper
    • D21F5/18Drying webs by hot air

Abstract

A papermaking assembly has wet paper web (1) transported by an endless sieve belt (2) as it passes between a blower hood (6) and a suction box (4). The box is covered by a slightly convex air-permeable Teflon-coated sheet metal profile (3). The wet web moves in contact with the convex profile. The belt (2) is a drying sieve and the profile (3) is a porous sheet metal panel made up of a series of sections end-to-end and extending more than 200 meters. The convex drying profile is essentially at right angles to the machine foundations and extend into cellar rooms. Also claimed is the use of the drying station in a papermaking process.

Description

  • The The invention relates to a hot air dryer Machine for producing and / or finishing a paper, cardboard, Tissue or another fibrous web in the one side of the Fibrous web acted upon in at least one treatment section with hot air will and the opposite Side of the fibrous web of an endlessly circulating, air-permeable band supported is, wherein the belt arranged at one with respect to the fibrous web Suction device passes by.
  • such Dryers are known, for example, from WO 0236880 and increase the drying rate with improved utilization of the available Space.
  • adversely is that the band especially at high vacuum and / or long unsupported Hangs hangs. This may damage the same upon contact of the belt with the suction device to lead. Furthermore, they can Problems with the leadership Adjust the fibrous web on the belt.
  • in addition comes that this changes the distance to the blowing device, which to an uneven drying to lead can. Also, the sealing of the tape against the suction device is more difficult.
  • The The object of the invention is therefore to the slack of the tape prevent.
  • According to the invention was solved the task by that between the band and the suction means a stationary, at least partially convex curved and breathable Guiding element is arranged, which is in contact with the tape.
  • Because of the air permeability the guide element is the suction of the fibrous web to the belt not significantly affected by the suction device.
  • The support the band on the guide element closes a slack in the band out, with the convex curvature for one low surface pressure between band and guide element and thus improves the tape guide.
  • Because of the thermal load and the required air permeability the band should be designed as a dryer.
  • in the With regard to ease of manufacture, it is advantageous if the guide element as a porous baffle is trained. The porosity can be achieved by drilling, that are designed and so big that on the one hand sufficient air permeability under consideration impending pollution ensured and on the other hand but no risk of damage to the Bandes emanating from these.
  • Around the load of the tape in contact with the stationary guide element This should be in the contact area with the band friction-reducing coating, for example made of Teflon possess and / or have a very low roughness.
  • Of Further can Production and installation of the guide considerably simplified are when the guide element composed of a plurality of sub-guide elements is.
  • Around the surface pressure between the belt and the guide element and thus also the friction to a small extent limit, should the smallest radius of curvature of the guide element in the contact area with the band greater than 50 m, preferably greater than 200 m.
  • The Treatment routes should be straight or curved, preferably slightly curved. This simplifies the construction and a better adaptation to the space conditions.
  • Further Room benefits arise when the treatment sections are vertical or at an angle run to the machine foundation and / or at least partially extend into the machine cellar.
  • The Blowing of the fibrous web with hot air takes place within the Treatment route from a blast hood, which preferably be adapted to the course of the band or the guide element should and can also be divided if necessary.
  • A particularly space-saving arrangement with high drying rate results if at least two treatment lines are present and this preferably associated with at least one separate guide element is.
  • there it is with two existing treatment routes of advantage, if these are opposite, wherein the tape running direction is opposite.
  • Between the two treatment lines, the band should, together with the outer fibrous web over at least one, preferably suctioned guide roll are performed.
  • Preferably should be the essential part of the trapped by the guiding elements Be filled space of the suction device. This is simplified the structure and makes only a vacuum connection for the suction device necessary.
  • A preferred application of the hot air dryer is given in dryer sections, in which the fibrous web to Drying over heated drying cylinder out becomes.
  • there it is advantageous if the tape is the fibrous web of a dryer the dryer section takes over and / or transfers to a drying wire of the dryer section.
  • The handover The fibrous web can hereby be further improved if the band the fibrous web at least over a drying cylinder of Drying section leads.
  • following the invention is based on an embodiment be explained in more detail. In the accompanying Drawing, the figure shows a schematic cross section through a hot air dryer as part of a dryer section.
  • In the dryer section of a paper machine, the fibrous web becomes 1 for drying over heated drying cylinders 5 and guide rolls, wherein the fibrous web 1 from a drying wire against the hot surface of the drying cylinder 5 is pressed.
  • to increase the drying rate is inside the dryer section Hot air dryer.
  • This hot air dryer has two treatment sections, one side, here in both the bottom of the fibrous web 1 is blown with hot air. During blowing the fibrous web becomes 1 from an air-permeable and endlessly circulating band 2 performed in the form of a dryer.
  • This dryer fabric carries the fibrous web 1 also at least over the two adjacent drying cylinders 5 the dryer section, which simplifies the web guide.
  • The blowing of the fibrous web 1 with hot air takes place in the treatment sections via a respective blast hood 6 that follow the course of the tape 2 or the guide element 3 is adjusted.
  • The band runs in the treatment sections 2 on a suction device 4 in the form of a stationary suction box along.
  • The negative pressure of this suction device 4 effected by the band 2 through the suction of the fibrous web 1 to the band 2 , This ensures a secure guidance of the fibrous web 1 even at high machine speeds.
  • To avoid the slack of the tape 2 to prevent this is supported 2 in the treatment sections on a separate, stationary, convex curved and also air-permeable guide element 3 in the form of a porous, ie pierced baffle.
  • This leaves the distance between the blast hood 6 and the fibrous web 1 constant, giving a uniform effect of the hot air on the fibrous web 1 results. Also the seal between support band 2 and suction device 4 makes it easier.
  • Both treatment lines have a slightly curved course with a radius of curvature of just over 100 m. This ensures a sufficient surface pressure hiss the tape 2 and the guide element 3 What the leadership of the band 2 improved.
  • To avoid the friction between the band 2 and guide element 3 to reduce, is the contact area of the guide element 3 coated with Teflon.
  • in the The treatment lines are interested in a space-saving arrangement approximately perpendicular to the machine foundation, where they are predominantly extend into the machine cellar.
  • there the treatment lines are opposite and spaced from each other arranged.
  • The treatment lines can so the suction device 4 Include almost completely, so that it can act on both sides and only needs a Unterduckanschluss.
  • As a result, the tape running direction 8th opposite in both treatment routes.
  • Between the treatment lines, the band runs 2 with the outer fibrous web 1 around an evacuated guide roll 7 , The negative pressure of this guide roller 7 ensures good guidance of the fibrous web 1 on the tape 2 during the wrap.
  • The detachment of the fibrous web 1 from the drying cylinder 5 is from another suction box 9 supported.

Claims (16)

  1. Hot-air dryer of a machine for producing and / or finishing a paper, board, tissue or another fibrous web ( 1 ) in which one side of the fibrous web ( 1 ) is acted upon in at least one treatment section with hot air and the opposite side of the fibrous web ( 1 ) of an endlessly circulating, air-permeable band ( 2 ), whereby the band ( 2 ) at one opposite the fibrous web ( 1 ) arranged suction device ( 4 ), characterized in that between the band ( 2 ) and the suction device ( 4 ) a stationary, at least partially convexly curved and air-permeable guide element ( 3 ) arranged with the band ( 2 ) is in contact.
  2. Hot air dryer according to claim 1, characterized in that the band ( 2 ) is designed as a drying wire.
  3. Hot air dryer according to claim 1 or 2, characterized in that the guide element ( 3 ) is designed as a porous baffle.
  4. Hot air dryer according to one of the preceding claims, characterized in that the guide element ( 3 ) in the contact area with the tape ( 2 ) has a friction-reducing coating.
  5. Hot air dryer according to one of the preceding claims, characterized in that the guide element ( 3 ) consists of several part-guiding elements.
  6. Hot air dryer according to one of the preceding claims, characterized in that the radius of curvature of the guide element ( 3 ) is greater than 50 m, preferably greater than 200 m.
  7. Hot air dryer according to one of the preceding claims, characterized that the treatment section is straight or curved, preferably slightly curved.
  8. Hot air dryer according to one of the preceding claims, characterized that the treatment lines are perpendicular or oblique to the machine foundation.
  9. Hot air dryer according to one of the preceding claims, characterized that the treatment routes at least partially in the machine cellar extend.
  10. Hot air dryer according to one of the preceding claims, characterized in that the fibrous web ( 1 ) in the treatment section of a blast hood ( 6 ) is blown with hot air.
  11. Hot air dryer according to one of the preceding claims, characterized in that at least two treatment sections are present and these each preferably a separate guide element ( 3 ) assigned.
  12. Hot air dryer according to claim 11, characterized in that the band ( 2 ) between the treatment lines together with the fibrous web ( 1 ) via at least one, preferably evacuated guide roller ( 7 ) to be led.
  13. Hot air dryer according to claim 10 or 11, characterized in that the two treatment sections are opposite, wherein the strip running direction ( 8th ) is opposite.
  14. Hot air dryer according to one of claims 11 to 13, characterized in that the essential part of the of the guide elements ( 3 ) enclosed space of the suction device ( 4 ) is filled out.
  15. Application of the hot-air dryer according to one of the preceding claims in a dryer section, in which the fibrous web ( 1 ) for drying over heated drying cylinders ( 5 ), characterized in that the band ( 2 ) the fibrous web ( 1 ) takes over from a dryer fabric of the dryer section and / or transfers to a dryer fabric of the dryer section.
  16. Application of the hot air dryer according to one of claims 1 to 14 in a dryer section, in which the fibrous web ( 1 ) for drying over heated drying cylinders ( 5 ), characterized in that the band ( 2 ) the fibrous web ( 1 ) at least over a drying cylinder ( 5 ) of the dryer section.
DE200510029377 2005-06-24 2005-06-24 Process and assembly to dry wet web of paper, carton or tissue paper in upright installation with air blower and slightly convex suction hood Withdrawn DE102005029377A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE200510029377 DE102005029377A1 (en) 2005-06-24 2005-06-24 Process and assembly to dry wet web of paper, carton or tissue paper in upright installation with air blower and slightly convex suction hood

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510029377 DE102005029377A1 (en) 2005-06-24 2005-06-24 Process and assembly to dry wet web of paper, carton or tissue paper in upright installation with air blower and slightly convex suction hood

Publications (1)

Publication Number Publication Date
DE102005029377A1 true DE102005029377A1 (en) 2007-01-04

Family

ID=37544849

Family Applications (1)

Application Number Title Priority Date Filing Date
DE200510029377 Withdrawn DE102005029377A1 (en) 2005-06-24 2005-06-24 Process and assembly to dry wet web of paper, carton or tissue paper in upright installation with air blower and slightly convex suction hood

Country Status (1)

Country Link
DE (1) DE102005029377A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103917714A (en) * 2011-11-08 2014-07-09 韩国烟草人参公社 Device of processing low ignition propensity cigarette paper and device of manufacturing low ignition propensity cigarette paper including the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103917714A (en) * 2011-11-08 2014-07-09 韩国烟草人参公社 Device of processing low ignition propensity cigarette paper and device of manufacturing low ignition propensity cigarette paper including the same
CN103917714B (en) * 2011-11-08 2015-11-25 韩国烟草人参公社 The equipment of the equipment processing low igniting property cigarette paper and low the igniting property cigarette paper of the manufacture comprising this equipment

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