EP1329549B1 - Calandre - Google Patents

Calandre Download PDF

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Publication number
EP1329549B1
EP1329549B1 EP20020027999 EP02027999A EP1329549B1 EP 1329549 B1 EP1329549 B1 EP 1329549B1 EP 20020027999 EP20020027999 EP 20020027999 EP 02027999 A EP02027999 A EP 02027999A EP 1329549 B1 EP1329549 B1 EP 1329549B1
Authority
EP
European Patent Office
Prior art keywords
hard
roll
rolls
nip
rollers
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 - Fee Related
Application number
EP20020027999
Other languages
German (de)
English (en)
Other versions
EP1329549A2 (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 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
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 stack of rolls of at least five rolls, of which at least two are formed as hard rolls and the rest as soft rolls forming nips therebetween, wherein at least one nip is operable independently of the other nips as Einzelnip.
  • Such a calender is known from US 6,248,215 B1.
  • the rollers are adjustable so that there are two open nips between two closed nips.
  • Such calenders are well known. With a number of rolls of five to eight, such calenders are referred to as “Janus” calenders. Ten or more rolls are supercalenders. The rollers have “soft” rollers whose surface is covered with plastic. These soft rolls work together with “hard” rolls whose surface is substantially harder than the surface of the soft rolls. A hard roller and a soft roller together form a "soft" nip, in which a material web, mainly a paper web, with increased pressure and, if one of the two rolls is heated, can also be subjected to an elevated temperature. When the web passes through the nip, it is compacted. At the same time, their surface properties, in particular gloss and smoothness, are improved.
  • either two such roll stacks can be connected in series one behind the other or a so-called alternating nip is provided, in which two soft rolls co-operate.
  • the soft rolls are hereinafter also referred to as "elastic rolls”.
  • calenders have been built, which can be operated in two different operating modes. It is on the one hand possible to close all nips and then lead the train through a corresponding number of nips. As a result, this operation is referred to as "normal operation". On the other hand, it is also possible to guide the web only through a single nip and there to pressurize and possibly temperature. This nip is then called a single nip or single nip. The other nips stay with one Operating mode open, because the rollers would be damaged if they lie against each other without interposition of a paper web and rotate with it. The operator of such a calender can thus drive the calender either in Einzelnip mode or in normal operation and so satin different paper types, without having to have two different machines ready.
  • single-pin operation which is also referred to as "single-nip operation".
  • the height of the line load is limited by the hard roller, which otherwise serves as an intermediate roller.
  • the Einzelelnip operation is therefore only possible as long as the deflection adjustment of the curvature of the hard roller can follow and the hard roller is grown in the rest of the compressive stress without support by another intermediate roller.
  • the corresponding hard roller In order to achieve a certain line load in the Einzelnip, the corresponding hard roller must be sized accordingly large. Since it often wants to provide all the hard rolls of a roll stack with the same diameter, it may then happen that the height of the line load in single-nip operation the sizes of all hard rolls in the calender determined. Basically, all rollers that are not involved in single-nip operation are oversized.
  • the invention has for its object to make the calender cheaper.
  • the single-nip limiting hard roll has a larger modulus of elasticity than the other hard rolls.
  • this roller is much more rigid, so that it opposes the deformation by the voltage applied to the individual nip counter roller a greater resistance.
  • the line load achieved due to the increased stiffness of the hard roll is then sufficient to satinize a paper web in Einzelnip-operation.
  • the modulus of elasticity of the single-lip limiting hard roll is at least 50% greater than the modulus of elasticity of the remaining hard rolls. This is a significant increase. Although the possible line load will not increase in the same proportion. However, the achievable with such a stiffer roller line loads are sufficient to satinize the web in Einzelelnip operation sufficient.
  • the single-nip limiting hard roll is made of steel and the remaining hard rolls are formed of chilled cast iron.
  • Hard casting is the usual material for "normal" hard rolls.
  • the single nip is formed between a soft end roll and a hard intermediate roll.
  • the soft end roller has the deflection adjustment members, and the improved flexural rigidity is fully effective in the hard roller.
  • the single nip limiting hard roll is designed as a heating roller. Even in Einzelelnip operation, you can not only with increased paper web Pressure, but also apply to elevated temperature.
  • a calender 1 has five rollers 2-6, of which the two end rollers 2, 6 and the middle intermediate roller 4 carry an elastic covering 7-9 made of a plastic.
  • the thickness of the elastic covering 7-9 is shown exaggerated here.
  • the two end rollers 2, 6 are formed as deflection adjustment rollers, i. they have hydrostatically lubricated support elements 10, 11, which are shown only schematically. With the support elements 10, 11, it is possible to give the two end rollers 2, 6 a desired bending line.
  • the upper end roller 2 is fixedly mounted in a stand 12.
  • the lower end roller 6 is supported by a hydraulic piston-cylinder arrangement 13 and can be loaded upward with a contact pressure.
  • the center rollers 3, 4, 5 are articulated in the stand 12 via levers 14, 15, 16. Schematically illustrated stops 17, 18, 19 limit movement of the intermediate rollers 3, 4, 5 down when the lower end roller 6 is lowered.
  • the lever 16 of the lowermost intermediate roll 5 cooperates with a hydraulic cylinder 20, which is also mounted in the stand 12.
  • the lever 16 may be designed for example as a two-armed lever, which is pivotable about a hinge point 21 in the stator 12. When the cylinder 20 is pressurized, it can lock the intermediate roller 5 in a lowered position, as shown in FIG. However, it does not have to be the lowest end position of the lower intermediate roller 5.
  • a paper web 22 is passed through all the nips 23-26 which are formed between the rollers 2-6, when these rollers abut in pairs with the interposition of the paper web 22 to each other. Guiding agent for the paper web 22 are not shown in detail for reasons of clarity. Also other additional elements, such as drives of the rollers 2-6 are not shown.
  • the hard rollers 3, 5 disposed between the soft rollers 2, 4, 6 are formed as heating rollers, i.
  • they include peripheral bores 27 through which a heating medium, such as hot water, hot oil or steam, may flow to heat the surface of the hard rolls 3, 5 to a surface temperature in the range of 80 ° to 160 ° C.
  • a heating medium such as hot water, hot oil or steam
  • the hard rollers 3, 5 have the same diameter. This is not an equality in the mathematically exact sense to understand. Rather, it is about identical diameter, but the diameter of the rollers can be changed by reworking measures, such as twisting or the like.
  • the lower intermediate roll 5 consists of a material with a relatively large modulus of elasticity, namely of steel with an E-modulus of 210,000 N / mm 2 or under the designation KSTV of the roll Irle GmbH, D-57244 Netphen, Germany, available chrome steel with an E-modulus of 205,000 N / mm 2 , while the other hard roll 3 consists of chilled cast iron with an E-modulus of 130,000 N / mm 2 .
  • the lower intermediate roll 5 is thus much more rigid than the upper intermediate roll 3.

Landscapes

  • Paper (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Treatment Of Fiber Materials (AREA)

Claims (6)

  1. Calandre (1) comprenant un empilement de cylindres constitué d'au moins cinq cylindres (2-6) dont au moins deux sont réalisés sous forme de cylindres durs (1, 5) et les autres sous forme de cylindres mous (2, 4, 6), qui forment entre eux des lignes de contact, au moins une ligne de contact (26) pouvant être utilisée indépendamment des autres lignes de contact en tant que ligne de contact individuelle, caractérisée en ce que tous les cylindres durs (3, 5) présentent le même diamètre et le cylindre dur (5) qui délimite la ligne de contact individuelle (26) peut être sollicité avec une plus grande charge linéaire que l'au moins un autre cylindre dur (3).
  2. Calandre selon la revendication 1, caractérisée en ce que le cylindre dur (5) délimitant la ligne de contact individuelle (26) présente un plus grand module d'élasticité que les autres cylindres durs (3).
  3. Calandre selon la revendication 2, caractérisée en ce que le module d'élasticité du cylindre dur (5) délimitant la ligne de contact individuelle (26) est d'au moins 50% plus élevé que le module d'élasticité des autres cylindres durs (3).
  4. Calandre selon l'une quelconque des revendications 1 à 3, caractérisée en ce que le cylindre dur (5) délimitant la ligne de contact individuelle (26) est en acier et les autres cylindres durs (3) sont en fonte coquillée.
  5. Calandre selon l'une quelconque des revendications 1 à 4, caractérisée en ce que la ligne de contact individuelle (26) est formée entre un cylindre d'extrémité mou (6) et un cylindre intermédiaire dur (5).
  6. Calandre selon l'une quelconque des revendications 1 à 5, caractérisée en ce que le cylindre dur (5) délimitant la ligne de contact individuelle (26) est réalisé sous forme de cylindre chauffé.
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 2002-01-16
DE20200584U DE20200584U1 (de) 2002-01-16 2002-01-16 Kalander

Publications (3)

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

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI95062C (fi) * 1993-12-29 1995-12-11 Valmet Paper Machinery Inc Kalanteri
DE19729531C2 (de) * 1997-07-10 2002-12-12 Voith Paper Patent Gmbh Papierkalander

Also Published As

Publication number Publication date
DE20200584U1 (de) 2002-03-28
DE50209339D1 (de) 2007-03-15
EP1329549A2 (fr) 2003-07-23
EP1329549A3 (fr) 2005-02-02

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