EP0732445A1 - Calandre pour le traitement d'une bande de papier - Google Patents

Calandre pour le traitement d'une bande de papier Download PDF

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Publication number
EP0732445A1
EP0732445A1 EP96103277A EP96103277A EP0732445A1 EP 0732445 A1 EP0732445 A1 EP 0732445A1 EP 96103277 A EP96103277 A EP 96103277A EP 96103277 A EP96103277 A EP 96103277A EP 0732445 A1 EP0732445 A1 EP 0732445A1
Authority
EP
European Patent Office
Prior art keywords
rolls
roller
soft
calender according
roll
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
EP96103277A
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German (de)
English (en)
Other versions
EP0732445B1 (fr
EP0732445B2 (fr
Inventor
Franz Kayser
Hans-Rolf Conrad
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 Paper GmbH and Co KG
Original Assignee
Voith Sulzer Finishing GmbH
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Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=26013182&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0732445(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from DE19534911A external-priority patent/DE19534911C2/de
Application filed by Voith Sulzer Finishing GmbH filed Critical Voith Sulzer Finishing GmbH
Publication of EP0732445A1 publication Critical patent/EP0732445A1/fr
Publication of EP0732445B1 publication Critical patent/EP0732445B1/fr
Application granted granted Critical
Publication of EP0732445B2 publication Critical patent/EP0732445B2/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
    • 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
    • D21G1/0233—Soft rolls

Definitions

  • the invention relates to a calender with a roll stack, which has a working nip formed between a hard and a soft roll and an alternating nip formed between two soft rolls, for the treatment of a paper web which is subjected to compressive stress in the working nips for a dwell time .
  • Such calenders are known, for example, from the brochure "The New Super Calender Concepts” from Sulzer Papertec Krefeld GmbH from May 1994. They serve to satin coated and uncoated papers, for example printing papers or silicone base papers.
  • "Hard” rollers are metal rollers with a smooth and hard surface, which are essentially responsible for the smoothness and gloss.
  • “Soft” rolls are rolls with a elastic or soft surface, which essentially ensure even compaction. The alternating gap is required so that both sides of the paper web are treated approximately evenly. It is common to use a calender with 12 to 16 rolls, with the alternating nip in the lower half of the stack.
  • the invention has for its object to provide a calender of the type described above, which largely ensures the same calendering results for a particular type of paper, but has a smaller height and its manufacturing and operating costs are lower.
  • the roll stack has fewer than 10 rolls, that the alternating gap is arranged in the middle of the stack, ie with an even number of rolls between the two middle rolls and with an odd number of rolls between the middle roll and an adjacent roll, and that the effective weight of the rollers and any associated parts is so low that the sum of the line loads of the working gaps above the alternating gap is at least 80% of the total of the line loads of the working gaps below the alternating gap.
  • the number of working gaps above the alternating gap is equal to or almost the same as the number of working gaps below the alternating gap, and is therefore less than in the known supercalender. Nevertheless, almost the same calendering result is achieved because - while maintaining a maximum permissible compressive stress in the lowest working gap - because of the smaller number of rollers and the lower weight influence of the rollers and possibly related parts, a higher line load than before can act in the first working gap and the line load increase is lower than in the known cases.
  • the calender Since the calender has a lower overall height, lower buildings are also required, which considerably reduces installation costs. Furthermore, the calender is inexpensive to manufacture and operate because of the smaller number of rolls.
  • the roll stack have eight rolls.
  • Such an 8-roll calender in which there are three working nips above and below the alternating nip, does essentially the same as a known 12-roll calender.
  • the web treatment below the alternating gap is the same in both cases.
  • the web treatment above the alternating gap is carried out with the elimination of four working columns; this is, however around the working column with the least amount of deformation.
  • a very high line load can already be applied in the first working gap, so that the paper web immediately undergoes considerable deformation.
  • the calendering performance can be taken into account even better if the sum of the products from the dwell time and mean compressive stress in the working gaps above the alternating gap is at least 80% of the sum of the products mentioned in the working gaps below the alternating gap. Because dwell time and compressive stress are two decisive factors for paper deformation.
  • the active plane of the roll stack be inclined to the vertical. With this construction, only the vertical component of the weight is included in the increase in the line load.
  • rollers themselves are light in weight. This is done with the hard rollers by giving them the smallest possible diameter. In the case of the soft rollers, one should use lighter structures instead of the compact and heavy rollers with paper cover.
  • the soft roller has a plastic jacket. Such covers are much thinner than paper covers and accordingly lighter.
  • the soft roller have a fiber-reinforced plastic, such as epoxy resin.
  • the fiber reinforcement in particular with carbon fibers, allows stability and low weight to be combined.
  • top and / or bottom roller is a soft roller. If both end rolls are soft, a 6-roll calender results. If only one end roller is soft, roller stacks with an odd number of rollers can be provided. In addition, soft end rolls with lower weight can be designed as hard end rolls, which makes it easier to adjust the line load totals above and below the alternating gap.
  • roller jacket consists of a material with insufficient wear resistance and has a cover made of an elastic plastic, and that the plastic has a higher wear resistance than the jacket material.
  • the roll shell consists of lamellar graphite cast iron, ie a cast iron with lamellar graphite. Its wall thickness can be reduced by almost 50% compared to a cast iron roller jacket.
  • this cast iron is not very wear-resistant. This disadvantage is compensated for by the fact that the cover made of elastic plastic serves as a wear protection layer. A layer thickness between 8 and 15 mm, preferably 10 mm, is sufficient for this purpose.
  • the roll shell consists of spheroidal graphite cast iron, ie a cast iron with spherical graphite. This allows a reduction in wall thickness compared to chilled cast iron of up to 59%.
  • At least one hard roller can be heated. This makes it possible to supply thermal deformation energy, so that overall a lower line load can be used. In addition, however, you can achieve a higher degree of adjustment of the satin result by different heating in the different working columns.
  • the upper and / or lower rollers can advantageously be heated. Heat can therefore be supplied in the first and also in the last gap, which offers correction options on both sides of the paper web.
  • the top middle roll is hard and heatable.
  • deformation energy in the form of heat is supplied to the paper web in the first working gap.
  • this has the advantage that the top roller can be made much simpler and cheaper, is exposed to lower temperatures and can be deformed more without the seal suffering as a result.
  • heating can be carried out here by means of steam, which can be supplied with excess pressure.
  • This type of heating is much simpler and cheaper than heating with oil, as would be required with a heated deflection compensation roller.
  • top and / or bottom roller is a deflection-controllable roller, in which a roller shell is supported by hydrostatic support elements on a carrier which is held in a rotationally fixed manner and which passes through it.
  • the deflection control allows the line load to be kept constant across the width of the paper web in order to achieve a very even satin finish result.
  • the deflection-controllable roller has a multi-zone control in which hydraulic fluid with different pressure can be supplied to the support elements individually or in pairs.
  • This multi-zone control in which the individual support elements are arranged close to each other and have an axial width of, for example, 5 to 20 cm, in conjunction with a soft roller jacket leads to an individual influence on the paper over very narrow areas even in the uppermost working gap, which is important leads to a high degree of uniformity of the desired parameters across the paper web.
  • the calender 1 illustrated in FIG. 1 has a roll stack consisting of eight rolls, namely a heatable, deflection-controllable hard top roll 2, a soft roll 3, a heatable hard roll 4, a soft roll 5, a soft roll 6, one heatable hard roller 7, a soft roller 8 and a heatable, deflection-controllable hard lower roller 9.
  • a heatable, deflection-controllable hard top roll 2 a soft roll 3
  • a heatable hard roll 4 a soft roll 5
  • a soft roll 6 one heatable hard roller 7, a soft roller 8 and a heatable, deflection-controllable hard lower roller 9.
  • a paper web 17 is fed from a paper machine 18, passes through the working gaps 10 to 12, the changing gap 16 and the working gaps 13 to 15 under the guidance of guide rollers 19, whereupon it is wound up in a winding device 20.
  • the paper web lies on one side in the three upper working columns 10 to 12 and in the three lower working columns 13 to 15 with the other side on the hard rollers, so that the desired surface structure, for example gloss or smoothness, is achieved on both sides.
  • each of the rollers 2 to 9 has its own drive 21. This enables the paper web 17 to be drawn in during operation.
  • a line load f1 results in the first working gap 10, which depends on the force P and the effective weight of the top roller 2, and a line load f2 in the second working gap 11, which depends on the force P and the weights of the depends on the two upper rollers 2 and 3, and so on up to the line load f6, which depends on the force P and the effective weights of all rollers 2 to 8.
  • the invention provides that the sum of the line loads f1 + f2 + f3 the top working column 10, 11 and 12 at least 80% of the total of the line loads f4 + f5 + f6 the bottom three working columns is 13, 14 and 15.
  • the calender had a width of 8.5 m and a web speed of 800 m / min.
  • the sum of the products from the medium compressive stress p and the dwell time t in the working gaps above the alternating gap 16 reached a value of 82% of the sum of the products in the working gaps located below the alternating gap.
  • values above this can also be achieved.
  • the compressive stress p in the working gap was between 45 and 60 N / mm 2 .
  • the heated rollers 2, 4, 7 and 9 were given a surface temperature between 100 and 150 ° C.
  • the diameter of the soft rollers and the elasticity of their coating 34 were chosen so that there was a gap width of about 2 to 15 mm , preferably about 8 mm. Depending on the web speed, this leads to dwell times t in each working gap of 0.1 to 0.9, preferably 0.2 to 0.5 ms. It is preferred if the temperature T is only slightly above the lower limit, for example 110 ° C., if the compressive stress p is only slightly above the lower limit, for example 50 N / mm 2 . Compared to a 12-roll calender, slight increases in thermal and mechanical energy are therefore sufficient to achieve the same calendering results in an 8-roll calender.
  • a 4-roll calender can also be set up, which is sufficient for simple applications, but which also results in the same calendering on both sides.
  • the roll stack illustrated in FIG. 4 has a soft top roll 102 and a soft bottom roll 109.
  • the alternating gap 116 located exactly in the middle is delimited by two soft rollers 105 and 106.
  • Two hard rollers 103 and 107, which are adjacent to the end rollers 102 and 109, are heated with water vapor, which is supplied with excess pressure.
  • the alternating gap was located exactly in the middle of the roll stack having an even number of rolls. Stacks with an odd number of rollers are described below.
  • FIG. 5 illustrates a 9-roll calender which has a soft top roll 202 but a hard bottom roll 209.
  • the alternating gap 216 is arranged between the soft middle roller 205 and the soft neighboring roller 206. Otherwise, heated hard center rolls alternate with soft rolls.
  • a total of seven rolls are used in the roll stack according to FIG. 6.
  • a hard top roller 302 and a soft bottom roller 309 are provided.
  • the alternating gap 316 is located between the soft middle roller 305 and the adjacent soft roller 306. Otherwise, heated hard middle rollers alternate with soft rollers.
  • roller shells can be constructed similarly to Fig. 3 and, for example, have a support tube made of spheroidal or lamellar graphite cast iron and have a cover made of elastic plastic.

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  • Paper (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
EP96103277A 1995-03-09 1996-03-04 Calandre pour le traitement d'une bande de papier Expired - Lifetime EP0732445B2 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19508351 1995-03-09
DE19508351 1995-03-09
DE19534911 1995-09-20
DE19534911A DE19534911C2 (de) 1995-03-09 1995-09-20 Kalander für die Behandlung einer Papierbahn

Publications (3)

Publication Number Publication Date
EP0732445A1 true EP0732445A1 (fr) 1996-09-18
EP0732445B1 EP0732445B1 (fr) 1998-10-21
EP0732445B2 EP0732445B2 (fr) 2004-09-08

Family

ID=26013182

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96103277A Expired - Lifetime EP0732445B2 (fr) 1995-03-09 1996-03-04 Calandre pour le traitement d'une bande de papier

Country Status (5)

Country Link
US (1) US5655442A (fr)
EP (1) EP0732445B2 (fr)
JP (1) JP2612679B2 (fr)
CA (1) CA2169976C (fr)
DE (1) DE29521610U1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6248215B1 (en) 1997-07-10 2001-06-19 Voith Sulzer Finishing Gmbh Calender and method for treating material webs in the calender
WO2006108450A1 (fr) * 2005-04-12 2006-10-19 Andritz Küsters GmbH & Co. KG Calandre

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE511203C2 (sv) * 1997-10-14 1999-08-23 Valmet Corp Långnypspress samt långnypspressko till densamma
DE19803323C2 (de) * 1998-01-29 2003-06-05 Voith Paper Patent Gmbh Verfahren zur Beeinflussung eines Bahnmaterials, wie Papier, und Kalander zur Durchführung des Verfahrens
US7096779B2 (en) * 1998-03-17 2006-08-29 Eduard Küsters Maschinenfabrik GmbH & Co. KG Calender arrangement
DE19811474A1 (de) * 1998-03-17 1999-09-23 Kuesters Eduard Maschf Kalanderanordnung
DE19820089C2 (de) * 1998-05-06 2000-06-15 Kuesters Eduard Maschf Verfahren zum Kalandrieren einer Warenbahn mit einem vertikalen Mehrwalzen-Kalander
DE19832065A1 (de) * 1998-07-16 2000-01-20 Voith Sulzer Papiertech Patent Kalanderanordnung für Bahnen aus Papier oder ähnlichem Material
ATE320525T1 (de) * 1999-08-27 2006-04-15 Metso Paper Inc Kalander mit zwei durchbiegungseinstellzwischenwalzen
FI20000615A (fi) * 2000-03-16 2001-09-17 Metso Paper Inc Kalanteri ja menetelmä kalanterin telan vaihtamiseksi
FI20001362A0 (fi) * 2000-06-07 2000-06-07 Valmet Corp Menetelmä paperirainan profiloimiseksi
ATE270728T1 (de) * 2001-03-22 2004-07-15 Kuesters Eduard Maschf Kalander
US7492965B2 (en) * 2004-05-28 2009-02-17 Lockheed Martin Corporation Multiple map image projecting and fusing
DE102013200614A1 (de) 2013-01-16 2014-07-17 Valmet Technologies, Inc. Vorrichtung und Verfahren zur Kalandrierung einer Faserbahn
WO2020154126A1 (fr) 2019-01-22 2020-07-30 Pontus Subsea Connectors Llc Connecteur électrique accouplable et non accouplable sous l'eau

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3154008A (en) * 1963-02-09 1964-10-27 Dominion Eng Works Ltd Calender stack
EP0027270A1 (fr) * 1979-10-15 1981-04-22 Valmet Oy Calandre à papier
US5237915A (en) * 1992-02-04 1993-08-24 The Mead Corporation Mixed roll calender
DE29504034U1 (de) * 1995-03-09 1995-05-04 Voith Sulzer Finishing GmbH, 47803 Krefeld Kalander für die zweiseitige Behandlung einer Papierbahn

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB202753A (en) * 1922-05-31 1923-08-30 Samuel Milne Improvements in calenders for calendering paper and the like
US2300994A (en) * 1938-08-09 1942-11-03 Cons Water Power & Paper Co Calender for paper
US3291039A (en) * 1964-04-20 1966-12-13 John A Manning Paper Co Inc Paper calender roll
US3340796A (en) * 1964-11-25 1967-09-12 Kimberly Clark Co Paper supercalender stack
US3451331A (en) * 1967-03-01 1969-06-24 Westvaco Corp Hot roll supercalender
US4283690A (en) * 1979-12-31 1981-08-11 Motorola, Inc. Low power CMOS oscillator
DE3640161A1 (de) * 1985-12-23 1987-07-02 Escher Wyss Gmbh Vorrichtung zum zueinander positionieren von walzenflaechen
DE3711334A1 (de) * 1987-04-03 1988-10-13 Escher Wyss Gmbh Vorrichtung zur fuehrung der walzen eines im wesentlichen vertikalen kalanders
FI96334C (fi) * 1993-11-24 1996-06-10 Valmet Paper Machinery Inc Menetelmä paperin tai vastaavan rainamateriaalin kalanteroinnissa ja menetelmää soveltava kalanteri

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3154008A (en) * 1963-02-09 1964-10-27 Dominion Eng Works Ltd Calender stack
EP0027270A1 (fr) * 1979-10-15 1981-04-22 Valmet Oy Calandre à papier
US5237915A (en) * 1992-02-04 1993-08-24 The Mead Corporation Mixed roll calender
DE29504034U1 (de) * 1995-03-09 1995-05-04 Voith Sulzer Finishing GmbH, 47803 Krefeld Kalander für die zweiseitige Behandlung einer Papierbahn

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
JOHN D. PEEL: "supercalendering and soft nip calendering compared", TAPPI JOURNAL, vol. 74, no. 10, October 1991 (1991-10-01), NORCROSS, GA., US, pages 179 - 186, XP000234497 *
THOMAS J. LAUTERBACH: "synthetic composite covers in supercalenders: update", TAPPI JOURNAL, vol. 76, no. 6, June 1993 (1993-06-01), NORCROSS, GA., US, pages 115 - 119, XP000420366 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6248215B1 (en) 1997-07-10 2001-06-19 Voith Sulzer Finishing Gmbh Calender and method for treating material webs in the calender
WO2006108450A1 (fr) * 2005-04-12 2006-10-19 Andritz Küsters GmbH & Co. KG Calandre

Also Published As

Publication number Publication date
CA2169976C (fr) 1998-12-01
JP2612679B2 (ja) 1997-05-21
US5655442A (en) 1997-08-12
DE29521610U1 (de) 1997-11-20
EP0732445B1 (fr) 1998-10-21
CA2169976A1 (fr) 1996-09-10
EP0732445B2 (fr) 2004-09-08
JPH08246382A (ja) 1996-09-24

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