EP2682520B1 - Procédé de production d'une bande fibreuse et ligne de production d'une bande fibreuse - Google Patents

Procédé de production d'une bande fibreuse et ligne de production d'une bande fibreuse Download PDF

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Publication number
EP2682520B1
EP2682520B1 EP12174715.8A EP12174715A EP2682520B1 EP 2682520 B1 EP2682520 B1 EP 2682520B1 EP 12174715 A EP12174715 A EP 12174715A EP 2682520 B1 EP2682520 B1 EP 2682520B1
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EP
European Patent Office
Prior art keywords
fiber web
calender
calendering
web
nip
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EP12174715.8A
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German (de)
English (en)
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EP2682520A1 (fr
Inventor
Henri Vaittinen
Pekka Linnonmaa
Jari Ilomäki
Mika Viljanmaa
Reijo PIETIKÄINEN
Jani Hakola
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Valmet Technologies Oy
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Valmet Technologies Oy
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Application filed by Valmet Technologies Oy filed Critical Valmet Technologies Oy
Priority to EP12174715.8A priority Critical patent/EP2682520B1/fr
Priority to CN201310236331.0A priority patent/CN103526628B/zh
Publication of EP2682520A1 publication Critical patent/EP2682520A1/fr
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/0073—Accessories for calenders
    • D21G1/0093—Web conditioning devices

Definitions

  • present invention relates to producing fiber webs in a fiber web production line. More especially the present invention relates to a method according to preamble part of claim 1 and to a production line according to preamble part of claim 6.
  • a typical production and treatment line comprises a head box, a wire section and a press section as well as a subsequent drying section and a reel-up.
  • the production and treatment line can further comprise other devices and/or sections for finishing the fiber web, for example, a pre-calender, a sizer, a final-calender, a coating section.
  • the production and treatment line also comprises at least one slitter-winder for forming customer rolls as well as a roll packaging apparatus.
  • Pre-calendering is typically used for creating required surface properties for further treatment for example for coating and final-calendering is generally carried out in order to improve the properties, like smoothness and gloss, of a web-like material such as a paper or board web.
  • a web-like material such as a paper or board web.
  • calendering the web is passed into a nip, i.e. calendering nip, formed between rolls that are pressed against each other, in which nip the web becomes deformed as by the action of temperature, moisture and nip pressure.
  • the nips are formed between a smooth-surfaced press roll such as a metal roll and a roll coated with resilient material such as a polymer roll or between two smooth-surfaced rolls.
  • the resilient-surfaced roll adjusts itself to the forms of the web surface and presses the opposite side of the web evenly against the smooth-surfaced press roll.
  • the nips can be formed also by using instead one of roll a belt or a shoe as known from prior art.
  • Many different kinds of calenders to be used as a pre-calender and/or as an final-calender are known, for example hard nip calenders, soft nip calenders, supercalenders, metal belt calenders, shoe calenders, long nip calenders, multinip calenders etc.
  • Paper and board are available in a wide variety of grades and can be divided according to basis weight in two categories: papers with a single ply and a basis weight of 25 - 300 g/ m 2 and boards manufactured in multi-ply technology and having a basis weight of 150 - 600 g/ m 2 . It should be noted that the borderline between paper and board is flexible since board grades with lightest basis weights are lighter than the heaviest paper grades. Generally speaking, paper is used for printing and board for packaging.
  • Mechanical-pulp based, i.e. wood-containing printing papers include newsprint, uncoated magazine and coated magazine paper.
  • Newsprint is composed either completely of mechanical pulp or may contain some bleached softwood pulp (0 - 15 %) and/or recycled fiber to replace some of the mechanical pulp.
  • General values for newsprint can be regarded as follows: basis weight 40 - 48,8 g/m 2 , ash content (SCAN-P 5:63) 0 - 20 %, PPS s10 roughness (SCAN-P 76:95) 3,0 - 4,5 ⁇ m, Bendtsen roughness (SCAN-P 21:67) 100 - 200 ml/min, density 200 - 750 kg/m 3 , brightness (ISO 2470:1999) 57 - 63 %, and opacity (ISO 2470:1998) 90 - 96 %.
  • Uncoated magazine paper usually contains mechanical pulp to 50 - 70 %, bleached softwood pulp to 10 - 25 %, and fillers to 15 - 30%.
  • Typical values for calendered SC paper containing e.g. SC-C, SC-B.
  • SC-A/A+ include basis weight 40 - 60 g/m 2 , ash content (SCAN-P 5:63) 0 - 35 %, Hunter gloss (ISO/DIS 8254/1) ⁇ 20 - 50 %, PPS s10 roughness (SCAN-P 76:95) 1,2 - 2,5 ⁇ m, Bendtsen roughness (SCAN-P 21:67) 100 - 200 ml/min, density 700 - 1250 kg/m 3 , brightness (ISO 2470:1999) 62 - 70 %, and opacity (ISO 2470:1998) 90 - 95 %.
  • General values for LWC paper can be regarded as follows: basis weight 40 - 70 g/m 2 , Hunter gloss 50 - 65 %, PPS s10 roughness 0,8 - 1,5 ⁇ m (offset), 0,6 - 1,0 ⁇ m (roto), density 1100 - 1250 kg/m 3 , brightness 70 - 75 %, and opacity 89 - 94 %.
  • MFC machine finished coated
  • basis weight 50 - 70 g/m 2 Basis weight 50 - 70 g/m 2 , Hunter gloss 25 - 70 %, PPS s10 roughness 2,2 - 2,8 ⁇ m, density 900 - 950 kg/m 3 , brightness 70 - 75 %, and opacity 91 - 95 %.
  • FCO film coated offset
  • MWC medium weight coated
  • basis weight 70 - 90 g/m 2 Basis weight 70 - 90 g/m 2 , Hunter gloss 65 - 75 %, PPS s10 roughness 0,6 - 1,0 ⁇ m, density 1150 - 1250 kg/m 3 , brightness 70 - 75 %, and opacity 89 - 94 %.
  • HWC (heavy weight coated) has a basis weight of 100 - 135 g/m 2 and can be coated even more than twice.
  • Pulp-produced, wood free printing papers or fine papers include uncoated - and coated - pulp-based printing papers, in which the portion of mechanical pulp is less than 10 %.
  • Uncoated printing papers contain bleached birchwood pulp to 55 - 80 %, bleached softwood pulp 0 - 30 %, and fillers to 10 - 30 %.
  • the values with WFU have a large variation: basis weight 50 - 90 g/m 2 , Bendtsen roughness 250 - 400 ml/min, brightness 86 - 92 %, and opacity 83 - 98 %.
  • WFC coated printing papers
  • the amounts of coating vary widely in accordance with requirements and intended application. the following are typical values for once- and twice-coated, pulp-based printing paper: once-coated basis weight 90 g/m 2 , Hunter gloss 65 - 80 %, PPS s10 roughness 0,75 - 2,2 ⁇ m, brightness 80 - 88 %, and opacity 91 - 94 %, and twice-coated basis weight 130 g/m 2 , Hunter gloss 70 - 80 %, PPS s10 roughness 0,65 - 0,95 ⁇ m, brightness 83 - 90 %, and opacity 95 - 97 %.
  • Release papers have a basis weight within the range of 25 - 150 g/m 2 .
  • Other papers include e.g. sackkraft papers, tissues, and wallpaper bases.
  • Board making makes use of chemical pulp, mechanical pulp and/or recycled pulp.
  • Boards can be divided e.g. in the following main groups cartonboards, containerboards and specialty boards.
  • Containerboards comprise f. ex. linerboard and fluting board and other corrugated boards and specialty boards comprise wallpaper base, plaster board etc.
  • Graphic boards are used for making e.g. cards, files, folders, cases, covers, etc.
  • US patent publication 5033373 is disclosed a process for producing a smooth and glossy surface on a paper web and a calender arrangement for carrying out the process.
  • This prior art calender arrangement comprises two sets of rolls through which the paper web is conducted in succession and each set of rolls comprises a highly heated hard roll and a soft roll.
  • a cooling device is arranged upstream of at least one of the calendering nips to restrict the amount of heat transfer to the inner layers of the paper web and the attendant, undesirable partial plasticization of the inner layers of the web.
  • EP 0957202 A2 is disclosed a process and apparatus for making SC-A-paper online. There is a multi-nip soft calender after the drying section and an intermediate cooling station at the end of the drying section followed by a steaming section.
  • DE 19534 911 A1 discloses a calender having a stack of hard and soft rolls with working nips formed between adjacent hard and soft rolls, and a change-over nip formed between two soft rolls.
  • the total number of rolls is less than ten, and the change-over nip is at (in the case of an even number of rolls), or as close as possible (in the case of an odd number) to the centre of the stack.
  • the effective weights of the rolls and any components attached to them is such that the sum of the loads in the nips above the change-over nip is at least 80% of the sum of the loads in the nips below it.
  • US 6207020 is disclosed a method for treating a web which comprises conditioning the web by applying a flow of moistened gas to a surface of the moving web across its width to promote convective heat transfer and thereby decrease its surface temperature.
  • the as a continuous web produced fiber web is reeled up into the form of a roll, a parent (machine, jumbo) roll.
  • the reeling is generally a first process part, wherein a continuous process is discontinued to be continued in sequences.
  • One problem in reeling after calendering is that the fiber web is still rather warm, typically in temperature range of 50 - 80 °C, and during reeling of warm fiber web the brightness of the fiber web reduces which leads to the need of cooling devices located after calendering, for example as disclosed in WO publication 2006/000630 .
  • An object of the invention is to create a method for producing fiber webs in which high bulkiness is received with less raw stock and a production line for carrying out the method.
  • Another object of the method is to create a method for producing fiber webs in which the problems relating to the reduced brightness in reeling are eliminated or at least minimized.
  • the production line according to the invention is mainly characterized by the features of the characterizing part of claim 6.
  • the fiber web is cooled before calendering to temperatures of not higher than 40 °C, preferably to temperature in the range of 10 - 30 °C.
  • the fiber web is reeled in a reel-up after the calendering such that the temperature of the web is not higher than 50 °C, preferably in temperature in the range of 20 - 40 °C.
  • the fiber web is calendered for a short dwell time for 0,01 - 6,0 ms (measured with the fiber web in the calendering nip), preferably for 0,2 - 3,0 ms (measured with the fiber web in the calendering nip).
  • the fiber web is cooled by direct or indirect cooling effect by the cooling means.
  • the fiber web is cooled after drying before calendering and in the cooling vaporizing the moisture from the fiber web is utilized when the heat is decreased.
  • the fiber web (W) is calendered to bulk loss less than 4 %.
  • the fiber web (W) is calendered to surface roughness PPS s10 under 2,0 ⁇ m.
  • the production line for producing fiber webs comprises at least one calender with at least one calendering nip, at least one cooling means before the at least one calender and a reel-up after the calender.
  • the production line comprises at least one cooling means before the at least one calender for cooling the fiber web to temperatures of not higher than 40 °C, preferably to temperature in the range of 10 - 30°C.
  • the cooling means is a device for blowing or creating a flow of fresh, cool outside air of which especially in the Nordic and in corresponding climate zone located countries is available an unlimited supply in required temperatures during most times of the year and no further device is needed for cooling the gas.
  • the calender is a soft nip or a hard nip calender or a corresponding calender with short dwell time of 0,01 - 6 ms, preferably of 0,2 - 3,0 ms.
  • a moisturizing device is located in connection with the cooling means for providing moisture vaporization from the fiber web with latent thermal cooling effect.
  • the moisture vaporization can be enhanced by the blow or flow created by the cooling means.
  • cooling means is/are located at machine level or below or above it in a machine hall of the production line for producing fiber webs.
  • the bulkiness of the fiber web is higher which leads to savings in raw stock and thus to environmental benefits. This is achieved due to calendering in low temperatures when the calendering effect is focused to the surface if the fiber web and thus the middle layer of the web is under reduced calendering effect which leads to higher bulkiness after calendering.
  • the beginning sections and parts of the production line have been indicated by reference 50.
  • the beginning sections and devices 50 of the production line for fiber webs W comprise a head box, forming section, press part, drying section and a sizer. These devices and sections can be constructed in various different designs and constructions known as such to one skilled in the art.
  • the production line also comprises a finishing part 60 with finishing sections and devices, for example a coating section etc. which are as such know to one skilled in the art and can be constructed in many various designs and constructions.
  • the production line also comprises at least one calender 20A; 20B with at least one calendering nip NA; NB formed between two calendering rolls 101 A, 102A; 101B, 102B and a cooling means 10A; 10B located before at least one of the calendering nips NA; NB of the calender 20A; 20B.
  • the first calender 20A in the main direction of the production is a pre-calender 10A and the second calender 20B is a final-calender 20B.
  • the cooling means 10A, 10B can be located before each of the calenders 20A; 20B or before only either one of the calenders 20A, 20B.
  • a reel-up 40 for reeling the fiber web W into a parent roll.
  • the parent rolls are transferred to slitting, winding and packing sections 70 for creating packaged customer rolls by slitting, winding and packaging.
  • the construction of these slitting, winding and packaging sections 70 can be provided in many various designs and constructions as such known to one skilled in the art.
  • the fiber web W is cooled by cooling means 10A to temperatures of not higher than 40 °C, preferably to temperature in the range of 10 - 30°C before calendering in the calender 20A.
  • the fiber web W can be also cooled by cooling means 10B to temperatures of not higher than 40 °C, preferably to temperature in the range of 10 - 30°C.
  • the fiber web W is reeled in a reel-up 40 after the calendering such that the temperature of the web is not higher than 50 °C, preferably in temperature in the range of 20 - 40 °C.
  • the fiber web W can cooled by the first cooling means 10A after drying it in a drying section before calendering it in the calender 20A such that in the cooling is utilized the remaining heat of the web W after the drying for vaporizing the moisture from the fiber web simultaneously.
  • the cooling means 10A; 10B is a device for blowing or creating a flow of fresh, cool outside air.
  • the calender 20A; 20B is a soft nip or a hard nip calender or a corresponding calender with a short dwell time of 0.01 -6 ms, preferably 0.2 - 3,0 ms.
  • a moistening device 15 can be located in connection with the cooling means 10A (also with cooling means 10B, not shown) for providing moisture vaporization from the fiber web W with latent thermal cooling effect.
  • the moisture vaporization can be enhanced by the blow or flow created by the cooling means 10A; 10B.
  • figure 2 is shown an example of effect of web temperature to bulk value during calendering and as can be seen from the figure 2 the cooling of the web before calendering to temperatures in the range of not higher than 40 °C has a great effect on saving bulk during calendering, the relative loss being less than 4 % and especially cooling to temperatures of 10 - 30 °C reduces the relative bulk loss to about 2 - 3,5 %.
  • figure 3 is shown an example of increase of surface roughness PPS s10 value in relation to the web temperature before calendering and as can be seen from the figure 3 PPS roughness increases, when web temperature increases from 10 °C to 70 °C.
  • the cooling of the web before calendering to temperatures in the range of not higher than 40 °C has an effect on the surface smoothness during calendering, the values of surface roughness PPS s10 under 2,0 ⁇ m and especially cooling to temperatures of 10 - 30°C reduces the surface PPS s10 roughness values.

Claims (7)

  1. Procédé pour la production d'une bande de fibres (W), la bande de fibres (W) dudit procédé étant calandrée dans au moins une ligne de contact de calandrage (NA ; NB) d'au moins une calandre (20A ; 20B) et enroulée dans une enrouleuse (40), ladite bande de fibres (W) étant refroidie par un moyen de refroidissement (10A ; 10B) avant le calandrage à des températures ne dépassent pas 40°C, de préférence à une température entre 10 et 30°C, caractérisé en ce que la bande de fibres (W) est enroulée dans l'enrouleuse (40) après le calandrage, de sorte que la température de la bande ne dépasse pas 50°C, étant de préférence à une température entre 20 et 40°C, et e n ce que la bande de fibres (W) est calandrée dans la calandre pour une courte durée de séjour de 0,01 à 6 ms, de préférence de 0,2 à 3,0 ms, ladite durée de séjour étant mesurée avec la bande de fibres dans la ligne de contact de calandrage.
  2. Procédé selon la revendication 1, caractérisé en ce que la bande de fibres (W) est refroidie par un effet de refroidissement direct ou indirect produit par le moyen de refroidissement (10A ; 10B).
  3. Procédé selon la revendication 1, caractérisé en ce que dans le procédé, la bande de fibres est calandrée après séchage de la bande de fibres dans une section de séchage, la bande de fibres (W) est refroidie après le séchage précédant le calandrage, et la vaporisation de l'humidité à partir de la bande de fibres est utilisée dans le refroidissement une fois que la chaleur a diminué.
  4. Procédé selon la revendication 1, caractérisé en ce que la bande de fibres (W) est calandrée avec une perte de volume inférieure à 4%.
  5. Procédé selon la revendication 1, caractérisé en ce que la bande de fibres (W) est calandrée à une rugosité de surface PPS s10 inférieure à 2,0 µm.
  6. Chaîne de production pour la production de bandes de fibres (W), comprenant au moins une calandre (20A ; 20B) avec au moins une ligne de contact de calandrage (NA ; NB) et une enrouleuse (40) situé en aval de la calandre (20A ; 20B), ladite chaîne de production comprenant au moins un moyen de refroidissement (10A ; 10B) situé en amont de l'au moins une calandre (20A ; 20B), pour le refroidissement de la bande de fibres à des températures ne dépassant pas 40°C, de préférence à une température entre 10 et 30°C,
    caractérisée en ce que le moyen de refroidissement est un dispositif de soufflage ou créant un flux d'air extérieur frais et froid, et en ce que la calandre (10A ; 10B) est une calandre avec une courte durée de séjour de 0,01 à 6 ms, de préférence de 0,2 à 3,0 ms, ladite durée de séjour étant mesurée avec la bande de fibres dans la ligne de contact de calandrage, la calandre (20A ; 20B) étant par exemple une calandre molle ou une calandre dure.
  7. Chaîne de production selon la revendication 6, caractérisée en ce qu'il est prévu un dispositif d'humidification (15) en connexion avec le moyen de refroidissement (10A ; 10B), pour fournir une vaporisation d'humidité à partir de la bande de fibres, avec un effet de refroidissement thermique latent.
EP12174715.8A 2012-07-03 2012-07-03 Procédé de production d'une bande fibreuse et ligne de production d'une bande fibreuse Active EP2682520B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP12174715.8A EP2682520B1 (fr) 2012-07-03 2012-07-03 Procédé de production d'une bande fibreuse et ligne de production d'une bande fibreuse
CN201310236331.0A CN103526628B (zh) 2012-07-03 2013-06-14 生产纤维幅材的方法以及生产纤维幅材的生产线

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Application Number Priority Date Filing Date Title
EP12174715.8A EP2682520B1 (fr) 2012-07-03 2012-07-03 Procédé de production d'une bande fibreuse et ligne de production d'une bande fibreuse

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EP2682520A1 EP2682520A1 (fr) 2014-01-08
EP2682520B1 true EP2682520B1 (fr) 2016-06-22

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022248116A1 (fr) 2021-05-28 2022-12-01 Voith Patent Gmbh Procédé et dispositif

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Publication number Priority date Publication date Assignee Title
EP2876206B2 (fr) * 2013-11-21 2023-03-01 Valmet Technologies, Inc. Procédé de produktion de bandes de fibres et ligne de fabrication de bandes de fibres
FI125831B (fi) * 2014-03-12 2016-03-15 Valmet Technologies Inc Kuiturainan kalanterointimenetelmä ja kalanteri kuiturainoja varten
EP3012371A1 (fr) 2014-10-21 2016-04-27 Valmet Technologies, Inc. Procédé de traitement d'une bande de matière fibreuse et calandre de pour traiter une bande de matière fibreuse
FI20155568A (fi) * 2015-07-28 2017-01-29 Oy Keskuslaboratorio - Centrallaboratorium Ab Menetelmä kuituradan kosteuden poistamiseksi
EP3231937B1 (fr) 2016-04-11 2022-08-31 Valmet Technologies Oy Ligne de production de bandes de fibres et refroidisseur
EP3231936B1 (fr) * 2016-04-11 2023-10-11 Valmet Technologies Oy Procédé de production de bandes de materiau fibreux
WO2018141727A1 (fr) * 2017-02-03 2018-08-09 Voith Patent Gmbh Traitement de bande continue
WO2018171959A1 (fr) * 2017-03-21 2018-09-27 Voith Patent Gmbh Traitement de bande
DE102019100884A1 (de) 2019-01-15 2020-07-16 Voith Patent Gmbh Vorrichtung und Verfahren zur Behandlung einer Faserstoffbahn

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DE102005053968A1 (de) 2005-11-11 2007-05-16 Voith Patent Gmbh Glättung
DE102006051537A1 (de) 2006-10-27 2008-04-30 Voith Patent Gmbh Vorrichtung zum Bearbeiten einer Bahn aus Papier oder Karton
DE102007006685A1 (de) 2007-02-10 2008-08-14 Voith Patent Gmbh Bahnbefeuchtung
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Publication number Priority date Publication date Assignee Title
GB532449A (en) 1939-06-22 1941-01-24 Samuel Milne Improvements relating to the manufacture of paper
US4738197A (en) 1984-11-30 1988-04-19 Oy Wartsila Ab Cooling of a paper web in a supercalender
DE3815463A1 (de) 1988-05-06 1989-11-16 Kuesters Eduard Maschf Verfahren zur erzeugung von glaette und glanz auf einer papierbahn und entsprechende kalanderanordnung
WO1990007027A1 (fr) 1988-12-22 1990-06-28 Sulzer-Escher Wyss Gmbh Procede pour lisser une bande de papier
DE19534911A1 (de) 1995-03-09 1996-09-12 Voith Sulzer Finishing Gmbh Kalander für die Behandlung einer Papierbahn
DE19826899B4 (de) 1998-05-08 2005-05-19 V.I.B. Systems Gmbh Verfahren und Vorrichtung zur Online-Kalandrierung von SC-A-Papier
EP0957202A2 (fr) 1998-05-08 1999-11-17 V.I.B. Apparatebau GmbH Procédé et dispositif pour la fabrication de papier SC-A online
US6207020B1 (en) 1998-05-12 2001-03-27 International Paper Company Method for conditioning paper and paperboard webs
DE10217910A1 (de) 2002-04-23 2003-11-13 Voith Paper Patent Gmbh Verfahren zum Behandeln einer Materialbahn und Kalander
DE10333524A1 (de) 2003-07-23 2005-02-17 Voith Paper Patent Gmbh Verfahren und Vorrichtung zur Herstellung einer Faserstoffbahn, insbesondere SC-A- oder SC-B-Papierbahn
DE102004024292A1 (de) 2004-05-15 2005-12-01 Voith Paper Patent Gmbh Breitnipkalanderanordnung
WO2006000630A1 (fr) 2004-06-29 2006-01-05 Metso Paper, Inc. Procede et dispositif permettant de refroidir une nappe fibreuse
DE102005000096A1 (de) 2005-07-28 2007-02-01 Voith Patent Gmbh Kalander und Verfahren zum Kühlen einer einen Kalander durchlaufenden Faserstoffbahn, insbesondere einer Papierbahn
DE102005053968A1 (de) 2005-11-11 2007-05-16 Voith Patent Gmbh Glättung
DE102006051537A1 (de) 2006-10-27 2008-04-30 Voith Patent Gmbh Vorrichtung zum Bearbeiten einer Bahn aus Papier oder Karton
DE102007006685A1 (de) 2007-02-10 2008-08-14 Voith Patent Gmbh Bahnbefeuchtung
DE102007011020A1 (de) 2007-03-07 2008-09-11 Voith Patent Gmbh Bahnkühlung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022248116A1 (fr) 2021-05-28 2022-12-01 Voith Patent Gmbh Procédé et dispositif
DE102021113813A1 (de) 2021-05-28 2022-12-01 Voith Patent Gmbh Verfahren und Vorrichtung

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EP2682520A1 (fr) 2014-01-08
CN103526628B (zh) 2016-05-18

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