EP0726354B1 - Trockengruppe einer Trockenpartie für bahnförmiges Material und Verwendung einer Trockengruppe zum stufenweisen Reduzieren des Dampfdrucks im Materialbahninneren - Google Patents

Trockengruppe einer Trockenpartie für bahnförmiges Material und Verwendung einer Trockengruppe zum stufenweisen Reduzieren des Dampfdrucks im Materialbahninneren Download PDF

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Publication number
EP0726354B1
EP0726354B1 EP96100386A EP96100386A EP0726354B1 EP 0726354 B1 EP0726354 B1 EP 0726354B1 EP 96100386 A EP96100386 A EP 96100386A EP 96100386 A EP96100386 A EP 96100386A EP 0726354 B1 EP0726354 B1 EP 0726354B1
Authority
EP
European Patent Office
Prior art keywords
dryer
drying
group
cylinder
web
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.)
Expired - Lifetime
Application number
EP96100386A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0726354A1 (de
Inventor
Hans Loser
Thomas Dr. Elenz
Albrecht Dr. Meinecke
Helmut Konecsny
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 Papiertechnik 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 Sulzer Papiertechnik Patent GmbH filed Critical Voith Sulzer Papiertechnik Patent GmbH
Publication of EP0726354A1 publication Critical patent/EP0726354A1/de
Application granted granted Critical
Publication of EP0726354B1 publication Critical patent/EP0726354B1/de
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

Definitions

  • the invention relates to a drying group Dryer section for sheet material, in particular a paper machine, according to the generic term of Claim 1 and the use of a drying group a dryer section for sheet material the features of claim 10.
  • the Material web also a meandering web, however, each from a drying cylinder one row to the following drying cylinder the other row of drying cylinders. Consequently one side of the material web comes into contact with the drying cylinders of the one row and the other side in contact with the drying cylinders the second row of drying cylinders.
  • Pressure band assigned to the material web each presses against the drying cylinder surface.
  • Be in a dryer section of a paper machine often single-tier and double-tier dryer groups used in combination to improve the material properties, such as shrinkage behavior and to influence the strength of the web.
  • a drying section is included in WO 92/20860 A1 a two-tier dryer group for drying one Paper web, which comprises several drying cylinders, over which the material web together with each one assigned to a row in the drying group Conveyor belt is guided.
  • Some of the drying cylinders is an additional, second conveyor belt assigned to the outside of the web of material conveyor belt pressing against the drying cylinder is present.
  • the additional conveyor belt that the drying cylinder in a relatively small size Wraps around the circumferential area, serves the pressure on the outer circumference of the drying cylinder Increase material web.
  • the first and second Conveyor belts are at different circumferential positions removed from the drying cylinder.
  • the object of the invention is to propose a drying group in which a burst the material web and / or a web break easily prevented. Another goal the invention is a use to be specified for the drying group.
  • This task is carried out using a drying group solved the features mentioned in claim 1.
  • This dryer group becomes several dryer fabrics used the one above the other a drying cylinder loop around each with different angles. Because at least two of the several Dryer screens in different positions from Drying cylinders are removed, the steam pressure gradually dismantled inside the material web, so that the material web bursts respectively tearing of the paper web is reliably prevented can be.
  • the dry group stands out characterized in that the dryer fabrics are different Have permeabilities, the respective permeability - seen from the drying cylinder - from decreases inside out. Because of the different Permeability of the dryer fabrics can be gradually reducing the vapor pressure in the Further improve the inside of the material web.
  • one after the other can be led away from the drying cylinder the contact pressure acting on the material web decrease gradually, increasing the vapor pressure can also gradually dismantle.
  • a preferred one Exemplary embodiment has the drying cylinder seen from outermost dryer fabric one Permeability from zero to.
  • the innermost dryer fabric finer and / or thinner than further out Dryer fabrics is the innermost dryer fabric finer and / or thinner than further out Dryer fabrics.
  • the fine right on the Material web overlying dryer fabric can be a very good smooth surface structure of the material web achieve. Because with such fine dryer fabrics no large screen tensions can be reached, are used for the dryer fabrics that are further out firmer or thicker dryer fabrics used, which allow higher screen tensions.
  • the outer dryer fabrics Enclose in a further embodiment of the invention the outer dryer fabrics a smaller one Area of the drying cylinder as more inside Dryer fabrics.
  • the invention can be in both single row and be provided in two-tier dryer groups.
  • a use is also used to solve the problem a dryer section of a dryer section for web-like Material, especially a paper machine, proposed with the features of claim 10.
  • the dry group includes at least one Drying cylinder made up of several dryer fabrics is partially entwined, one on top of the other Drying cylinders are guided, the web-shaped Material between the drying cylinder and the -from Drying cylinder seen from the innermost dryer fabric is guided and with at least two dryer fabrics at different circumferential positions from the drying cylinder be removed for gradual reduction the vapor pressure inside the material web.
  • a drying cylinder 1 and two shown in Figure 1 this adjacent deflection rollers 3 and 5 are part a single-tier dryer group.
  • a single-tier dryer group consisting of several for example arranged in a row Drying cylinders and several deflecting rollers. Drying cylinder and deflection rollers are arranged in such a way that the paper web meanders the Drying group runs through, the paper web alternately the guide rollers and drying cylinders passed.
  • a paper web is running 7 first around the deflection roller 3, then around the Drying cylinder 1 and then the other Deflection roller 5.
  • the one wrapped by the paper web 7 Angle a on the drying cylinder 1 or Wrapping area depends on the distance respectively the arrangement of the two guide rollers 3 and 5.
  • a defined wrapping area is heated the paper web 7 over the lateral surface of the Drying cylinder 1 instead.
  • this becomes the inside of the drying cylinder is fed with steam.
  • higher temperatures should be reached be, for example of about 300 ° C, so you go for gas firing of the cylinders, i.e. one Combustion of gases inside the cylinder, about.
  • first endless dryer fabric 9 In addition to the first endless dryer fabric 9 are three additional in the area of the drying cylinder 1 Endless dryer fabrics 11, 13 and 15 are provided. All three dryer fabrics 11, 13 and 15 are via a common deflecting roller 17 with the first Dryer screen 9 merged at a common point 19. Thus in this area lie on the Paper web 7 first the dryer fabric 9, then that Dryer 11, the dryer 13 and the very outside the dryer 15.
  • the contact pressure exerted on the paper web 7 consequently consists of the individual of the four Dryer screens 9, 11, 13 and 15 generated power components together.
  • the dryer fabric 13 is used Deflection rollers 23 and 23a according to a wrap angle c and with the dryer 11 over deflection rollers 25, 25a and 25b according to a wrap angle d procedure.
  • the dryer fabric 9 alone remains even when the deflection roller 5 rotates in contact with the paper web 7.
  • the outermost dryer fabric web 15 is included a permeability of 0, i.e. impermeable to water vapor, chosen.
  • the permeability of the underlying Dryer fabrics 13, 11, 9 then take off the web to train to so that the water vapor permeability from pressure zone Z2 to pressure zone Z4 step by step increases. This also allows the Gradually reduce the steam pressure to a value, the harmless with regard to the bursting of the paper web is.
  • FIG 2 another embodiment of the Dry group shown, which in turn is a single-tier dryer group. Compared to Figure 1, however, are several in a row Drying cylinder 1 and several dryer fabric suction rolls 27 shown.
  • dryer fabric suction rollers 27 are used. These have suction zones 29 which are in that circumferential area of the rollers on which the dryer fabric lies 9 and the paper web 7 are passed.
  • the Diameter of the dryer fabric suction rolls 27 approximately Diameters of the drying cylinder 1 correspond.
  • the drying cylinder diameters are something smaller and the deflection roller diameter, that is Suction roll diameter got bigger.
  • the dryer fabric suction rolls be made stiffer so that a The longitudinal tension of the dryer fabric can be increased is.
  • FIG. 1 An exemplary embodiment is shown in FIG which the principle of the invention on a double row Dry group is applied.
  • a two-tier dryer group usually sits consisting of drying cylinders arranged in two rows 31 and 41 together.
  • the paper web 7 passes through the dry group alternating in a meandering pattern from a drying cylinder 31 of the upper row to a drying cylinder 41 of the lower row, etc.
  • Each drying cylinder row are, according to the Drying fabrics 9, 11, 13 and 15 of Figure 1, drying fabrics 32, 33, 34 and 42, 43, 44 respectively.
  • this will be Dryer screen 32 via a deflection roller 35 with the paper web 7 merged and after a wrap angle a on the drying cylinder 31 via a further deflection roller 35a removed.
  • This deflection roller 35a in turn serves to bring the Dryer screen 32 closest to paper web 7 Drying cylinder 31 of the upper row of drying cylinders. This process is repeated until the last one Drying cylinder 31 of the top row, with a deflecting roller 35c the dryer fabric 32 to the beginning of the Dry group returns.
  • Deflection rollers corresponding to the deflection rollers 35a, 35b 36a, 36b and 37a, 37b are the Dryer screens 33 and 34 assigned. Only the feeder at the beginning of the drying group and return at the end of the drying group each via a common deflecting roller 38 or 38a accomplished.
  • Figure 4 is a section of a schematic Dryer section shown, the several in a row switched single and double row dryer groups 51, 53, 55 and 57.
  • the paper web for example coming from an upstream press section, first runs into the two-row dryer group 51 and is heated there.
  • the subsequent single-row dryer group 53 in which the drying cylinders are at the top, the paper web is heated more and is pressed against the cylinders more strongly than in dryer group 51 by means of increased dryer fabric tension (arrow S) in order to achieve good heating and compression of the material.
  • the last two drying cylinders of dryer group 53 are assigned the plurality of dryer fabrics according to the invention, while in FIG. 2 several dryer fabrics run over all cylinders 1 of the dryer group.
  • the end of the dryer section can then be a double row Form dryer group 57.
  • FIG. 5 shows an exemplary embodiment similar to FIG. 4, however, in the single row Differences in groups 53 and 55 can be seen are.
  • the drying group 53 are all drying cylinders assigned two dryer fabrics during the Drying cylinders of dryer group 55 three dryer fabrics, corresponding to the example shown in FIG. 2, assigned.
  • the present invention can that means the assignment of several dryer fabrics to a drying cylinder within a drying group or a complete dryer section as desired respectively.
  • the stake is not just on that single row dry groups shown in Figures 4 and 5 limited. So it's also possible to provide a double-tier dryer group in which both the top and bottom rows of Drying cylinders several drying screens one above the other assigned.

Landscapes

  • Paper (AREA)
  • Drying Of Solid Materials (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
EP96100386A 1995-02-04 1996-01-12 Trockengruppe einer Trockenpartie für bahnförmiges Material und Verwendung einer Trockengruppe zum stufenweisen Reduzieren des Dampfdrucks im Materialbahninneren Expired - Lifetime EP0726354B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19503767 1995-02-04
DE19503767A DE19503767A1 (de) 1995-02-04 1995-02-04 Trockengruppe einer Trockenpartie für bahnförmiges Material

Publications (2)

Publication Number Publication Date
EP0726354A1 EP0726354A1 (de) 1996-08-14
EP0726354B1 true EP0726354B1 (de) 2000-06-21

Family

ID=7753238

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96100386A Expired - Lifetime EP0726354B1 (de) 1995-02-04 1996-01-12 Trockengruppe einer Trockenpartie für bahnförmiges Material und Verwendung einer Trockengruppe zum stufenweisen Reduzieren des Dampfdrucks im Materialbahninneren

Country Status (7)

Country Link
US (1) US5649371A (fi)
EP (1) EP0726354B1 (fi)
JP (1) JPH08240383A (fi)
CN (1) CN1042246C (fi)
AT (1) ATE194021T1 (fi)
DE (2) DE19503767A1 (fi)
FI (1) FI960479A (fi)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5669159A (en) * 1995-05-12 1997-09-23 The Institute Of Paper Science And Technology Method and apparatus for drying a fiber web at elevated ambient pressures
DE19619531B4 (de) * 1996-05-15 2012-04-05 Voith Sulzer Papiermaschinen Gmbh Maschine zur Herstellung einer Materialbahn
CN104606689B (zh) * 2014-12-08 2017-10-20 浙江工商职业技术学院 弹性球毛巾烘干消毒器
CN104524606B (zh) * 2014-12-08 2017-08-25 浙江工商职业技术学院 毛巾烘干消毒器

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2433122A (en) * 1944-03-20 1947-12-23 Beloit Iron Works Felt and drum assembly for drying webs
US3151953A (en) * 1960-12-23 1964-10-06 Beloit Iron Works Belt conveying arrangement in paper drying machine
US3354035A (en) * 1966-11-08 1967-11-21 Albemarle Paper Co Continuous process of drying uncoated fibrous webs
BE770196A (fr) * 1970-08-07 1971-12-01 Pirelli Appareil pour la vulcanisation continue
US3797384A (en) * 1971-12-20 1974-03-19 Beloit Corp Multiple belt press
DE2324704A1 (de) * 1973-05-16 1974-11-28 Kuesters Eduard Vorrichtung zur kontinuierlichen druckund waermebehandlung von bahnen
DD122560A6 (fi) * 1975-07-05 1976-10-12
US5031338A (en) * 1987-02-13 1991-07-16 Beloit Corporation Vacuum roll transfer apparatus
ES2011381A6 (es) * 1988-08-17 1990-01-01 Garcia Pastor Daniel Proceso mecanico de secado aplicable a la fabricacion de papel.
WO1991008339A1 (en) * 1989-11-27 1991-06-13 Beloit Corporation A press section apparatus
BE1004802A3 (fr) * 1991-05-15 1993-02-02 V. Asten, Fabriques De Feutres Pour Papeteries, Societe Cooperative Procede et dispositif de sechage de bande de papier, de carton et de matieres analogues.
DE4416585C2 (de) * 1994-05-11 1999-09-02 Voith Gmbh J M Trockenpartie einer Papiermaschine

Also Published As

Publication number Publication date
US5649371A (en) 1997-07-22
ATE194021T1 (de) 2000-07-15
DE19503767A1 (de) 1996-08-08
CN1042246C (zh) 1999-02-24
CN1137084A (zh) 1996-12-04
EP0726354A1 (de) 1996-08-14
FI960479A0 (fi) 1996-02-02
JPH08240383A (ja) 1996-09-17
FI960479A (fi) 1996-08-05
DE59605454D1 (de) 2000-07-27

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