EP1329549A2 - Calandre - Google Patents

Calandre Download PDF

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Publication number
EP1329549A2
EP1329549A2 EP02027999A EP02027999A EP1329549A2 EP 1329549 A2 EP1329549 A2 EP 1329549A2 EP 02027999 A EP02027999 A EP 02027999A EP 02027999 A EP02027999 A EP 02027999A EP 1329549 A2 EP1329549 A2 EP 1329549A2
Authority
EP
European Patent Office
Prior art keywords
hard
roller
nip
rollers
rolls
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
EP02027999A
Other languages
German (de)
English (en)
Other versions
EP1329549B1 (fr
EP1329549A3 (fr
Inventor
Jochen Autrata
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 Paper 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 Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1329549A2 publication Critical patent/EP1329549A2/fr
Publication of EP1329549A3 publication Critical patent/EP1329549A3/fr
Application granted granted Critical
Publication of EP1329549B1 publication Critical patent/EP1329549B1/fr
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/002—Opening or closing mechanisms; Regulating the pressure
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/02—Rolls; Their bearings
    • D21G1/0246—Hard rolls

Definitions

  • the invention relates to a calender with a roll stack at least five reels, at least of which two as hard rollers and the rest as soft rollers are formed, which form nips between themselves, wherein at least one nip independent of the other nips can be operated as a single nip.
  • Such calenders are generally known. At a Such calenders are numbered from five to eight rolls referred to as the "Janus" calender. At ten or more Rolls are super calenders. With the rollers there are “soft” rollers, the surface of which is covered with a Plastic cover is provided. These soft rollers work together with “hard” rollers, the surface of which is essential harder than the surface of the soft rollers is.
  • One hard roller and one soft roller together form a "soft" nip in which a material web, mainly a paper web, with a raised one Pressure and, if one of the two rollers is heated, can also be subjected to an elevated temperature can. If the material web is passed through the nip, it is compressed. At the same time, their surface properties, especially gloss and smoothness, improved.
  • a hard roller On both sides of the material web on a hard roller can be either two such roller stacks be connected in series or a so-called change nip is provided in which two soft rollers work together.
  • the soft rollers are also referred to below as “elastic rollers”.
  • calenders have been built in two different operating modes can be operated. On the one hand, it is possible to close all nips and then run the web through a corresponding number of nips. As a result, this operation is considered “normal Operation ". On the other hand, it is also possible to run the web through a single nip only and to apply pressure and possibly temperature there. This nip is then called a single nip or single nip designated. The remaining nips remain with one Operating mode open because the rollers are damaged would if they were without a paper liner have to lie together and have to turn. The operator Such a calender can either be the calender drive in single-nip operation or in normal operation and satinize different types of paper, without having two different machines ready for it got to.
  • single-nip operation which also as "Single nip operation" is called.
  • the level of the line load is limited by the hard roller, which otherwise serves as an intermediate roller.
  • the single-nip operation is only possible as long as the deflection adjustment roller follow the curvature of the hard roller can and the hard roller in the rest of the compressive stress even without backing by another intermediate roller has grown.
  • the corresponding hard must Roll are dimensioned accordingly large. Since one often all hard rolls of a roll stack with the wants to have the same diameter, it can happen that the level of the line load in single nip operation determines the sizes of all hard rolls in the calender. So basically all rollers that are not on Single nip operations are involved, oversized.
  • the invention has for its object the calender to make it cheaper.
  • This task is performed on a calender of the type mentioned at the beginning Art solved in that all hard rollers the have the same diameter and the hard roller that limited the single nip, with a higher line load resilient than the at least one other hard roller is.
  • the hard one delimiting the individual nip preferably has Roll a larger modulus of elasticity than the other hard ones Roll on. This makes this roller much more rigid, so that they are deformed by the in the individual nip mating roll has greater resistance opposes.
  • the line load due to the enlarged Rigidity of the hard roller is achieved then sufficient to run a paper web in single-nip operation to satinize.
  • the modulus of elasticity is preferably that which limits the individual nip hard roller at least 50% larger than that Modulus of elasticity of the remaining hard rolls. This is a clear one Increase. Although the possible line load will not increase in the same ratio. The one such a stiffer roller achievable line loads but are sufficient for the material web in single-nip operation sufficiently satin.
  • the hard roll delimiting the individual nip is made of steel or KSTV and the other hard rolls are made of chilled cast iron.
  • Chilled cast iron is the usual material for "normal" hard rolls.
  • KSTV is a chrome steel, which is available, for example, from Walzen Irle GmbH, D-57244 Netphen, Germany.
  • the individual nip is preferably between a soft one End roll and a hard intermediate roll formed.
  • the soft end roller has the deflection adjustment elements on and the improved bending stiffness comes into its own in the hard roller.
  • the hard one delimiting the individual nip is preferred Roll designed as a heating roller. Also in single-nip operation the paper web can then not only be raised Pressure, but also apply elevated temperature.
  • a calender 1 has five rolls in the present case 2-6, of which the two end rollers 2, 6 and middle intermediate roller 4 an elastic covering 7-9 wear out of a plastic.
  • the thickness of the elastic Pads 7-9 are shown exaggeratedly large.
  • the two end rollers 2, 6 are as deflection adjustment rollers trained, i.e. they exhibit hydrostatically lubricated Support elements 10, 11, which are only schematic are shown. With the support elements 10, 11 it is possible, the two end rollers 2, 6 a desired bending line to convey.
  • the upper end roller 2 is stationary in a stand 12 stored.
  • the lower end roller 6 is hydraulic Piston-cylinder assembly 13 supported and after can be loaded with a contact pressure at the top.
  • the center rollers 3, 4, 5 are articulated via levers 14, 15, 16 stored in the stand 12. Shown schematically Stops 17, 18, 19 limit movement of the intermediate rolls 3, 4, 5 down when the bottom end roller 6 is lowered.
  • the lever 16 of the bottom intermediate roller 5 cooperates a hydraulic cylinder 20 together, which also is stored in the stand 12.
  • the lever 16 can for example be designed as a two-armed lever, the is pivotable about a hinge point 21 in the stand 12. If cylinder 20 is pressurized, then he can the intermediate roller 5 in a lowered position lock, as shown in Fig. 2. It However, it does not have to be the lowest end position act the lower intermediate roller 5.
  • the hard rolls 3, 5 between the soft rolls 2, 4, 6 are arranged as heating rollers, i.e. for example, they have peripheral holes 27 through which a heating medium, for example hot Water, hot oil or steam that can flow around the Surface of the hard rolls 3, 5 to a surface temperature heat in the range of 80 ° to 160 ° C.
  • a heating medium for example hot Water, hot oil or steam that can flow around the Surface of the hard rolls 3, 5 to a surface temperature heat in the range of 80 ° to 160 ° C.
  • the hard rollers 3, 5 have the same diameter on. This is not a mathematical equality to understand the exact meaning. Rather, it is about identical diameter, the diameter of the rollers however, through revision measures, such as Turn it off or something similar can.
  • the lower intermediate roller 5 consists of a material with a relatively large modulus of elasticity, namely steel with an elastic modulus of 210,000 N / mm 2 or KSTV with an elastic modulus of 205,000 N / mm 2 , while the other hard roller 3 is made of chilled cast iron with an elastic modulus of 130,000 N / mm 2 .
  • Rollers made of the material KSTV are available, for example, from Walzen Irle GmbH, D-57244 Netphen, Germany.
  • the lower intermediate roller 5 is thus significantly more resistant to bending than the upper intermediate roller 3. If the lower intermediate roller 5 were also designed as a cast iron roller with the same diameter, a line load of 50 N / mm could be achieved. If the modulus of elasticity is increased by at least 50%, line loads of up to 70 N / mm are possible.

Landscapes

  • Paper (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Treatment Of Fiber Materials (AREA)
EP20020027999 2002-01-16 2002-12-14 Calandre Expired - Fee Related EP1329549B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20200584U DE20200584U1 (de) 2002-01-16 2002-01-16 Kalander
DE20200584U 2002-01-16

Publications (3)

Publication Number Publication Date
EP1329549A2 true EP1329549A2 (fr) 2003-07-23
EP1329549A3 EP1329549A3 (fr) 2005-02-02
EP1329549B1 EP1329549B1 (fr) 2007-01-24

Family

ID=7966599

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20020027999 Expired - Fee Related EP1329549B1 (fr) 2002-01-16 2002-12-14 Calandre

Country Status (2)

Country Link
EP (1) EP1329549B1 (fr)
DE (2) DE20200584U1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004003715B3 (de) * 2004-01-24 2005-08-18 Voith Paper Patent Gmbh Verfahren zum Betreiben eines Mehrwalzenkalanders und Kalander
DE102006031023A1 (de) 2006-07-05 2008-01-10 Voith Patent Gmbh Kalander

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0661405A1 (fr) * 1993-12-29 1995-07-05 Valmet Paper Machinery Inc. Calendrier
US6248215B1 (en) * 1997-07-10 2001-06-19 Voith Sulzer Finishing Gmbh Calender and method for treating material webs in the calender

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0661405A1 (fr) * 1993-12-29 1995-07-05 Valmet Paper Machinery Inc. Calendrier
US6248215B1 (en) * 1997-07-10 2001-06-19 Voith Sulzer Finishing Gmbh Calender and method for treating material webs in the calender

Also Published As

Publication number Publication date
DE50209339D1 (de) 2007-03-15
DE20200584U1 (de) 2002-03-28
EP1329549B1 (fr) 2007-01-24
EP1329549A3 (fr) 2005-02-02

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