EP0777013A2 - Machine pour la fabrication d'une bande continue - Google Patents

Machine pour la fabrication d'une bande continue Download PDF

Info

Publication number
EP0777013A2
EP0777013A2 EP96116086A EP96116086A EP0777013A2 EP 0777013 A2 EP0777013 A2 EP 0777013A2 EP 96116086 A EP96116086 A EP 96116086A EP 96116086 A EP96116086 A EP 96116086A EP 0777013 A2 EP0777013 A2 EP 0777013A2
Authority
EP
European Patent Office
Prior art keywords
web
machine according
free
interfering
roller
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.)
Granted
Application number
EP96116086A
Other languages
German (de)
English (en)
Other versions
EP0777013A3 (fr
EP0777013B1 (fr
Inventor
Peter Kahl
Wolfgang Müller
Thomas Buchmaier
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 EP0777013A2 publication Critical patent/EP0777013A2/fr
Publication of EP0777013A3 publication Critical patent/EP0777013A3/fr
Application granted granted Critical
Publication of EP0777013B1 publication Critical patent/EP0777013B1/fr
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
    • 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
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/36—Guiding mechanisms
    • D21F1/40—Rolls
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper

Definitions

  • the invention relates to a machine for producing a continuous web, in particular paper or cardboard web, according to the preamble of claim 1.
  • this is guided around various rollers in a meandering manner, optionally together with a conveyor belt.
  • press or drying rolls are used, around which the web is guided with a certain wrap angle.
  • the meandering course of the web is determined by web guide rollers.
  • the web can be guided around the rollers, for example around drying cylinders and web guide rollers, in such a way that a so-called free draw results, that is to say a web section in which the web does not touch any roller.
  • Free trains of this type are used, for example, to influence the shrinkage behavior and curl of the web.
  • the fact that the air currents present in the vicinity of the free train are influenced in a targeted manner can prevent the web edges from turning or being lifted off and thus also eliminating the disadvantages mentioned.
  • the air currents are influenced by an interfering body which is arranged at a distance from the surface of the free train to avoid turbulence and thus influences the boundary layer, that is to say the air layer entrained by the web or the conveyor belt.
  • the disruptive body is designed such that it extends — in the direction of transport of the web or transversely thereto — over an area of the free draft in order to avoid turbulence within the boundary layer. This ensures that the edges of the web do not change or lift off.
  • interfering body has at least one interfering body element which is arranged in the region of the air boundary layer carried by the web and which extends at least over the edge region of the web. This arrangement affects in particular the air boundary layer in the edge region of the web, so that Here, turbulence and thus lifting or folding can be avoided.
  • An embodiment of the machine is particularly preferred in which the interfering body is designed as a passive air guiding body, which is therefore not vacuumed or has any air outlet areas.
  • the disruptive body can therefore be implemented inexpensively in a simple manner.
  • An embodiment of the machine is preferred, which is characterized in that the interfering element is arranged parallel to the surface of the free train. This results in a particularly effective influence on the boundary layer given in the area of the free draft.
  • a scraper device which removes the air boundary layer from the roller surface from which the free train runs.
  • the interfering element of the interfering body is arranged in the area between the scraper device and free movement and is characterized by a particularly good influence on the air boundary layer and thus by optimally avoiding uncontrolled air flows.
  • an embodiment of the machine is preferred which is characterized in that the disturbing body has an air guiding device which comprises at least one air guiding element arranged essentially perpendicular to the free draft.
  • the disturbing body has an air guiding device which comprises at least one air guiding element arranged essentially perpendicular to the free draft.
  • Such an embodiment is characterized by that a folding or lifting of the edges of the web is particularly effectively prevented.
  • FIG. 1 shows a plurality of rollers 1, 3 and 5, around which a web 7 is optionally meandered, together with a conveyor belt.
  • the directions of rotation of the rollers are indicated by arrows.
  • the web 7 runs off the roller 5 and onto the roller 3. From this, the web 7 continues to the roller 1.
  • the rollers 1 and 5 can be drying cylinders, for example; the roller 3 is a web guide roller.
  • a first free train 9 is formed between the roller 5 and the roller 3
  • a second free train 11 is formed between the roller 3 and roller 1.
  • the web 7 is not supported on the rollers, at most on the conveyor belt.
  • a scraper device 13 interacts with the surface of the roller 5 and is used in the event of a web break Remove paper from roller 5.
  • a scraper 15 rests on the surface of the roller 5, which is attached to a scraper body 17.
  • a boundary wall 19 of the scraper device 13 runs essentially parallel to the first free train 9.
  • a disturbing body 21 is associated with the edge region of the web 7 and is located at a distance from the surface of the free train 9, which was in contact with the roller 5, in order to avoid turbulence.
  • the interfering body has an interfering body element 23 which, as can be seen from FIG. 1, viewed in the transport direction of the web 7, extends over an area of the free train 9.
  • the interfering element 23 also extends perpendicular to the image plane, that is to say seen transversely to the direction of transport of the web 7, over an area of the free train 9.
  • the interfering element 23 is of flat design, that is to say the extent of the interfering element measured in the direction of transport of the web 7 or transversely thereto 23 is much larger than its thickness measured perpendicular to the surface of the free train.
  • the length of the base body, as seen in the transport direction of the web 7, is selected such that the interfering body element 23 covers approximately half of the free train 9.
  • the side edges of the interfering element 23 are rounded in order to avoid the occurrence of turbulence.
  • the interfering element 23 is arranged in the region of the boundary layer, which is provided on the upper side of the web 7 facing the roller 5. It is arranged so that the scraper 15 from the Air removed from the surface of the roller 5 cannot reach the surface of the first free train 9.
  • the side edge 27 of the interfering body element 23 facing the opening nip 25 is therefore located near the point of contact of the scraper 15 on the surface of the roller 5.
  • the longitudinal surface of the interfering element 23 facing the first free train 9 and its opposite longitudinal surface are, for example, arranged essentially parallel to one another in the embodiment shown here.
  • the longitudinal surface facing the scraper body 17 here also runs essentially parallel to the boundary wall 19 of the scraper body 17.
  • the interfering body 21 or the interfering body element 23 is preferably movably mounted so that the distance to the web 7 and to the contact points of the web 7 delimiting the free train 9 with the rollers 5 and 3 can be adjusted. In this way, the previously uncontrolled air flows and turbulence can be influenced in a targeted manner.
  • the arrangement of the disturbing body 21 can therefore be adapted to different operating states, in particular to different transport speeds of the web 7.
  • the interference body element 23 is provided at least in the region of the edge of the web. It can extend more or less far over the width of the web 7 and thereby have a continuous interfering element 23 or individual partial elements which are arranged at a distance from one another over the width of the web 7. It is also conceivable that the interfering element 23 several in the transport direction Track seen - has adjacent sub-elements that are connected to each other in a suitable manner.
  • FIG. 1 shows that the disturbing body 21 is arranged in the region of a free train 9 running from a roller 5 and is assigned to the surface of the web 5 running from the roller 5.
  • the disruptive body 21 is arranged on the other side of the roller 3, that is to say in the region of the second free train 11 in which the web 7 runs off the roller 3 and onto the roller 1.
  • the interference body 21 is assigned to the surface of the web 7 that runs onto the roller 1.
  • the effect of the disturbing body 21 can be further improved in that it has an air guiding device 29 which, in order to avoid turbulence, comprises at least one air guiding element 31, as shown in FIG.
  • the air guiding element 31 is arranged essentially perpendicular to the disturbing body element 23 of the disturbing body 21.
  • FIG. 2 shows that the air guiding element 31 has a longitudinal edge 33 facing the web 7, which runs at a short distance from the surface of the free train 9 which runs off the roller 5.
  • the length of the air guide element 31 is selected so that it extends practically over the entire length of the free train 9, that is, it extends far into the opening nip 25.
  • the height of the air guide element 31 is chosen so that it is between the Scraper device 13 and the surface of the free train 9 given distance completely covered here and also covers areas of the scraper body 17.
  • the length and width of the air guide element 31 can be adapted to the various air flow conditions.
  • the air-guiding element 31 in such a way that it covers the edge of the web 7 and, as indicated by dashed lines in FIG. 2, also spans parts of the roller 5, the scraper device 13 and the roller 3. From the dashed contours in FIG. 2 it can be seen that the air guiding device 29 can thus be so large that the free train 9 is covered in its entire edge region in order to influence uncontrolled air flows in a targeted manner and to avoid the web edges from turning or being lifted off. In particular, it is avoided that air flows laterally under the web edges.
  • the air guiding device 29 is preferably movably mounted, so that its position can be adapted to different air flow conditions. It can be provided that the air guide element 31 is moved together with the interfering element 23. However, it is also conceivable that the air guide element 31 is movably supported relative to the interference body element 23 of the interference body 21, so that the air guide element 31 can be positioned independently of the position of the interference body element 23.
  • the air guiding element 31 can be provided with openings in order to influence the air flows in a targeted manner.
  • the interfering element 23 can be made very small, so that it practically only serves to hold the air guiding device 29. This configuration is preferred if the air flows are to be influenced at the very edge of the web 7, while the other air conditions are not intended to be influenced.
  • the positioning of the interfering element 23 and the air guiding element 31 can be carried out manually.
  • An automatic adjustment of the position of both elements to different air flow conditions is also conceivable in order to ensure a flexible influence on the air flows and to prevent the edges of the web 7 from turning or lifting.
  • the configuration of the machine shown here for producing a continuous web can not only be used for the production of paper or cardboard webs. Rather, it can be used in all cases in which a web is guided in a meandering manner, in particular at high speed, over a plurality of rollers during a production process, so that air currents can lead to the edges of the web turning over or lifting off, which impairs the production process.
  • existing machines can be retrofitted with an interference body of the type explained here.

Landscapes

  • Advancing Webs (AREA)
  • Replacement Of Web Rolls (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
  • Paper (AREA)
EP96116086A 1995-12-01 1996-10-08 Machine pour la fabrication d'une bande continue Expired - Lifetime EP0777013B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19544881 1995-12-01
DE19544881A DE19544881A1 (de) 1995-12-01 1995-12-01 Maschine zur Herstellung einer kontinuierlichen Bahn

Publications (3)

Publication Number Publication Date
EP0777013A2 true EP0777013A2 (fr) 1997-06-04
EP0777013A3 EP0777013A3 (fr) 1998-05-13
EP0777013B1 EP0777013B1 (fr) 2001-09-26

Family

ID=7778955

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96116086A Expired - Lifetime EP0777013B1 (fr) 1995-12-01 1996-10-08 Machine pour la fabrication d'une bande continue

Country Status (6)

Country Link
US (1) US5882481A (fr)
EP (1) EP0777013B1 (fr)
KR (1) KR970043582A (fr)
CN (1) CN1158927A (fr)
CA (1) CA2191809A1 (fr)
DE (2) DE19544881A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10024358A1 (de) * 2000-05-17 2001-11-22 Voith Paper Patent Gmbh Trockenpartie

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9305752U1 (de) * 1993-04-16 1993-11-04 Sulzer-Escher Wyss Gmbh, 88212 Ravensburg Zweizug-Trockenpartie für Papierbahnen
EP0692569A2 (fr) * 1994-07-13 1996-01-17 Andritz-Patentverwaltungs-Gesellschaft m.b.H. Procédé et dispositif dans un séchoir à cylindres d'une machine à papier ayant deux toiles de séchage

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3875682A (en) * 1973-03-16 1975-04-08 Beloit Corp Sheet stabilizer for dryer
US4359828A (en) * 1979-11-05 1982-11-23 Weyerhaeuser Company Vacuum box for use in high speed papermaking
DE3706542A1 (de) * 1987-02-28 1988-09-08 Voith Gmbh J M Luftleitkasten fuer die trockenpartie einer schnellaufenden papiermaschine
FI82502C (fi) * 1989-05-02 1991-03-11 Valmet Paper Machinery Inc Foerfarande och anordning i torkpartiet av en pappersmaskin foer att effektivera spetsdragningen av banan.
FI82958C (fi) * 1989-09-01 1991-05-10 Tampella Oy Ab Anordning vid ett torkparti av en pappersmaskin.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9305752U1 (de) * 1993-04-16 1993-11-04 Sulzer-Escher Wyss Gmbh, 88212 Ravensburg Zweizug-Trockenpartie für Papierbahnen
EP0692569A2 (fr) * 1994-07-13 1996-01-17 Andritz-Patentverwaltungs-Gesellschaft m.b.H. Procédé et dispositif dans un séchoir à cylindres d'une machine à papier ayant deux toiles de séchage

Also Published As

Publication number Publication date
CA2191809A1 (fr) 1997-06-02
US5882481A (en) 1999-03-16
EP0777013A3 (fr) 1998-05-13
EP0777013B1 (fr) 2001-09-26
CN1158927A (zh) 1997-09-10
KR970043582A (ko) 1997-07-26
DE59607764D1 (de) 2001-10-31
DE19544881A1 (de) 1997-06-12

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