WO2009147285A1 - Procede de manipulation d’une bande fibreuse dans une calandre a courroie metallique et dispositif permettant la mise en œuvre de ce procede - Google Patents

Procede de manipulation d’une bande fibreuse dans une calandre a courroie metallique et dispositif permettant la mise en œuvre de ce procede Download PDF

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Publication number
WO2009147285A1
WO2009147285A1 PCT/FI2009/050433 FI2009050433W WO2009147285A1 WO 2009147285 A1 WO2009147285 A1 WO 2009147285A1 FI 2009050433 W FI2009050433 W FI 2009050433W WO 2009147285 A1 WO2009147285 A1 WO 2009147285A1
Authority
WO
WIPO (PCT)
Prior art keywords
fibrous web
processing zone
metal belt
humidifying
humidifying agent
Prior art date
Application number
PCT/FI2009/050433
Other languages
English (en)
Inventor
Henri Vaittinen
Reijo PIETIKÄINEN
Original Assignee
Metso Paper, Inc.
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 Metso Paper, Inc. filed Critical Metso Paper, Inc.
Priority to CN2009801203320A priority Critical patent/CN102046880B/zh
Priority to DE112009001391T priority patent/DE112009001391T5/de
Priority to AT0920709A priority patent/AT508815A3/de
Publication of WO2009147285A1 publication Critical patent/WO2009147285A1/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/0066—Calenders; Smoothing apparatus using a special calendering belt
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/0006—Driving arrangements

Definitions

  • the present invention relates to a method for handling a fibrous web in a metal belt calender, in which method an endless metal belt is arranged to rotate around a guide means and to form a processing zone with a counter- element provided outside the metal belt, and in which the fibrous web is humidified at least on one side before passing it through the processing zone.
  • the invention further relates to a device for handling a fibrous web in a metal belt calendar, in which device an endless metal belt is arranged to rotate around a guide means and to form a processing zone with a counter- element provided outside the metal belt, and which device includes means for humidifying the fibrous web at least on one side before passing it through the processing zone.
  • the humidity regulation of the web to be processed can be carried out by methods known as such, for example, by steaming the surface/surfaces of the web before passing the web to the processing zone.
  • the cross-direction profile of the web can be effected in the desired manner and the method allows for considerable variation in web humidity.
  • Paper and board grades There are numerous different paper and board grades and these can be divided into two categories on the basis of grammage: papers, which have a single layer and a grammage of 25-300 g/m 2 , and boards made by multi- layer technique and having a grammage of 150-600 g/m 2 . As can be seen from this, the borderline between paper and board is a sliding one since boards having the lightest grammage are lighter than the heaviest papers. Paper is generally used for printing and board for packaging.
  • Mechanical pulp based, i.e. wood-containing, printing papers include newsprint, uncoated magazine paper and coated magazine paper.
  • Newsprint is composed either completely of mechanical pulp or it may contain some bleached softwood pulp (0-15%) and/or recycled fibre to replace some of the mechanical pulp.
  • general values for newsprint may be regarded the following: grammage 40-48.8 g/m 2 , ash content (SCAN-P 5:63) 0-20%, PPS SlO roughness (SCAN-P 76-95) 3.0-4.5 ⁇ m, Bendtsen roughness (SCAN-P21:67) 100-200 ml/min, density 600-750 kg/m 3 , brightness (ISO 2470:1999) 57-63% and opacity (ISO 2470:1998) 90-96%.
  • Uncoated magazine paper usually contains 50-70% mechanical pulp, 10-25% bleached softwood pulp, and 15-30% fillers.
  • Typical values for calendered SC paper are: grammage 40-60 g/m 2 , ash content (SCAN-P 5:63) 0-35%, Hunter gloss (ISO/DIS 8254/1) ⁇ 20-50%, PPS SlO roughness (SCAN-P 76:95) 1.0-2.5 ⁇ m, density 700-1250 kg/m 3 , brightness (ISO 2470:1999) 62-70% and opacity (ISO 2470:1998) 90-95%.
  • LWC paper may be regarded the following: grammage 40-70 g/m 2 , Hunter gloss 50-65%, PPS SlO roughness 0.8-1.5 ⁇ m (offset) and 0.6-1.0 ⁇ m (roto), density 1100-1250 kg/m 3 , brightness 70-75% and opacity 89-94%.
  • MFC paper machine finished coated
  • grammage 50-70 g/m 2 Hunter gloss 25-70%
  • PPS SlO roughness 2.2-2.8 ⁇ m density 900-950 kg/m 3
  • brightness 70-75% opacity 91-95%.
  • FCO paper film coated offset
  • grammage 40-70 g/m 2 Hunter gloss 45-55%
  • PPS SlO roughness 1.5-2.0 ⁇ m density 1000-1050 kg/m 3
  • brightness 70-75% opacity 91- 95%.
  • MWC paper medium weight coated
  • grammage 70-90 g/m 2 Hunter gloss 65-75%
  • PPS SlO roughness 0.6-1.0 ⁇ m density 1150-1250 kg/m 3
  • brightness 70-75% brightness 70-75%
  • opacity 89-94% opacity 89-94%.
  • HWC heavy weight coated
  • HWC has a grammage of 100-135 g/m 2 and it can be coated even more than twice.
  • Woodfree printing papers made of chemical pulp, or fine papers include uncoated and coated chemical-pulp based printing papers, in which the proportion of mechanical pulp is less than 10%.
  • Uncoated chemical-pulp based printing papers contain 55-80% bleached birchwood pulp, 0-30% bleached softwood pulp, and 10-30% fillers. With WFU, the values vary considerably: grammage 50-90 g/m 2 (up to 240 g/m 2 ), Bendtsen roughness 250-400 ml/min, brightness 86-92% and opacity 83-98%. In coated chemical-pulp based printing papers (WFC), the amounts of coating vary greatly in accordance with the requirements and intended use.
  • grammage of once coated 90 g/m 2 Hunter gloss 65- 80%, PPS SlO roughness 0.75-2.2 ⁇ m, brightness 80-88%, and opacity 91- 94%
  • grammage of twice coated 130 g/m 2 Hunter gloss 70-80%, PPS SlO roughness 0.65-0.95 ⁇ m, brightness 83-90% and opacity 95-97%.
  • Release papers have a grammage ranging from 25 to 150 g/m 2 .
  • Boards constitute a fairly heterogeneous group which includes grades having a high grammage of up to 500 g/m 2 and grades having a low grammage of about 120 g/m 2 , the grades ranging from ones based on virgin fibre to 100% recycled fibre based grades, and from uncoated to multiply coated.
  • board grades are divided into coated and uncoated grades because coating has the greatest effect on the calendering method.
  • coated grades both precalendering before the coating machine and the final calender after the coating machine are used. Uncoated grades are only subjected to final calendering. These two groups include several board grades as follows:
  • Coated board grades vary from one-layer to five-layer board. The most important qualities are large bulk, rigidity and smoothness.
  • the board is often one-sided, but may also be two-sided (SBB boards).
  • Precalendering is applied before the coating machine to reduce roughness and porosity to a target level characteristic of the coating machine.
  • the precalendering method is dependent on many variables, the most important being the following:
  • Precalendering mainly serves the purpose of CD-direction calibre control when there is a Yankee cylinder in the board machine (typically a folding boxboard machine).
  • the Yankee cylinder produces an extremely smooth surface with large bulk.
  • Precalendering is usually done with one hard-nip calender, based on either thermal or hydraulic calibre control. Line loads are typically fairly low, 10-30 kN/m, and thermo roll temperatures 70-100°C.
  • Typical board grades made without a Yankee cylinder are solid bleached board, white lined chipboard, coated recycled board and liquid packaging board.
  • precalendering was carried out by using a multi-roll hard-nip calender and the calendering effect was enhanced by adding water by means of water boxes (wet stack calenders).
  • the number of rolls varies from 4 to 11 depending on the board grade; the more readily calendered European fibres do not require as many nips as fibres originating from the southern part of the USA.
  • Recycled fibres are likewise more readily calendered than virgin fibres.
  • thermo roll has shifted precalendering towards hot calendering.
  • the aim is to use hot hard nip calendering or soft calendering.
  • Increased thermo roll temperatures result in bulk savings due to the temperature gradient.
  • the runnability of a hot hard nip calender or soft calender is better than that of a multi-roll hard nip calender.
  • the application of water on wet stack calenders is not easy to control.
  • Uncoated board grades often have only one or two layers. Multi-layered, uncoated boards, such as liquid packaging boards, can also be produced. As with coated boards, the calendering of uncoated boards should also save on bulk and rigidity.
  • calendering is not required.
  • calendering was almost always carried out on hard nip calenders.
  • the display and advertising function of fluted packages has recently become increasingly important. This has increased demands for a higher-quality, bleached surface layer.
  • Soft calenders are, therefore, used also for uncoated board grades when good printability is required.
  • Steam-jet sprayers may be used before the calender to improve the outcome of calendering if the board is cooled.
  • the aim of the present invention is to provide for as optimal as possible calendaring of a fibrous board, which is preferably composed of at least one of the foregoing paper and board grades, to higher formation scale roughness and bulk with lower micro-level roughness (PPS) and improved printing properties.
  • a fibrous board which is preferably composed of at least one of the foregoing paper and board grades, to higher formation scale roughness and bulk with lower micro-level roughness (PPS) and improved printing properties.
  • the method according to the present invention is characterised in that in order to humidify the fibrous web, the humidifying agent is supplied on the surface of the fibrous web 0.2-4 seconds before conveying it to the processing zone, and that 0.01-10 grams of humidifying agent per square metre is supplied, whereby subsequent to passing through the processing zone, the bulk of the fibrous web is greater than 1.40 cm 3 /g and the PPs roughness is 2-6 ⁇ m.
  • the means for humidifying the fibrous web are located at such point before the processing zone in the direction of travel of the fibrous web, where the humidifying agent can be supplied on the surface of the fibrous web 0.2-4 seconds before conveying it to the processing zone, and that the means for humidifying the fibrous web are arranged to supply 0.01-10 grams of humidifying agent per square metre, whereby subsequent to passing through the processing zone, the bulk of the fibrous web is greater than 1.40 cm 3 /g and the PPs roughness is 2-6 ⁇ m.
  • the foregoing aims for improving the properties.
  • the advantage of this is, for example, a significant improvement of the end product.
  • Figure 1 shows the device for implementing the method according to the invention in an exemplary manner
  • Figure 2 shows a diagram of the changes in the surface roughness and bulk of unhumidified and humidified folding boxboard in connection with calendaring.
  • Figure 1 shows a device according to the invention implemented as a belt calendar comprising a calendering belt 2 made of metal which rotates around guide rolls 3, of which guide rolls at least one is movable for adjusting the belt 2 tension as desired.
  • the calendering belt 2 travels around a roll 5 arranged outside of it, whereby a calendering zone is formed between the belt 2 and the roll 5.
  • the material web W to be calendered passes through the calendaring zone, whereupon it is subjected to the desired pressure impulse and thermal effect as a function of time.
  • Figure 1 illustrates by a dot-and-dash line 9 the shape of the pressure impulse when a nip roll 4 acting as a pressing means is arranged inside the calendaring belt 2, the said roll pressing the belt against the roll 5, thus forming a higher-pressure nip zone within the calendering zone.
  • Dash line 8 for its part, illustrates the shape of the pressure impulse when the contact pressure acting in the calendaring zone is created only by means of the belt 2 tension, when the nip roll 4 is out of pressing contact with the belt 2 (or when no nip roll 4 is not mounted inside the belt 2). It is understandable from this that the arrangement forms a so-called long nip.
  • the roll 5, like the nip roll 4, may or may not be a deflection-compensated roll and it is selected from a group including a flexible surface roll, such as a polymer-coated roll, a rubber- coated roll or an elastomer-surface roll, a shoe roll, a thermo roll and a fibre roll.
  • a flexible surface roll such as a polymer-coated roll, a rubber- coated roll or an elastomer-surface roll, a shoe roll, a thermo roll and a fibre roll.
  • the nip roll is a shoe roll.
  • Reference numeral 6 represents heating means, such as an induction heater, an infrared radiator, a gas burner or a capacitive heater.
  • elevated temperatures for example from higher than about 100 0 Ci to higher than about 200 0 C and even up to about 400 0 C, depending on the application.
  • An elevated temperature together with a long application time and an extensive pressure regulation range yields a good calendaring result at both high and low speeds, for example, speeds ranging from 100 m/min to 4000 m/min.
  • the web is humidified in the direction of travel of the web at a point preceding the processing zone.
  • a humidifier 7 is provided in the vicinity of the fibrous web for spreading the humidifying agent on the surface of the fibrous web.
  • the humidifying agent is usually water (water vapour or mist).
  • 0.01-10 grams of humidifying agent per square meter is spread on the surface of the web.
  • the humidifying agent is spread on the surface of the web timewise 0.2-4 seconds before the said point reaches the processing zone. The said time is also partly dependent on the type of the fibrous web. It is also obvious that the humidifier 7 may be out of use, in which case no humidifying agent is spread on the surface of the fibrous web.
  • the length and/or overall pressure of the processing zone may be adjusted with respect to the feed time and/or volume of humidifying agent.
  • thermo roll surface was about 170 0 C and that of the backside metal belt about 80 0 C.
  • the humidifying agent was spread on the surface of the material web W on the thermo roll side, where the measurements were carried out.
  • FIG. 2 shows a diagram in which curve 10 represents the measurement results without humidification.
  • Point 10a corresponds to a press nip pressure of 3 MPa
  • 10b a pressure of 6 MPa
  • point 10c a pressure of 9 MPa.
  • Curve 11 represents calendering carried out at a constant 5 MPa pressure of the press nip, with humidification.
  • Point 11a corresponds to a humidification value of 0 g/m 2 , point lib a humidification value of 2 g/m 2 , point lie a humidification value of 3 g/m 2 , point Hd a humidification value of 4 g/m 2 , point lie a humidification value of 6 g/m 2 .
  • the diagram clearly shows an advantageous lessening of roughness when the surface of the web is humidified in accordance with the method. It should be noted that the square outlined in bold in the diagram is a target zone within which the bulk and the PPS roughness value should desirably be after calendering. It can be seen that by means of humidification, both the PPS roughness and the bulk will fall within this zone.
  • the target value for pulp is greater than 1.40 cm 3 /g and the target for PPs roughness is 2-6 ⁇ m.

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  • Paper (AREA)

Abstract

L’invention concerne un procédé de manipulation d’une bande fibreuse (W) dans une calandre à courroie métallique (1). Dans ce procédé, une courroie métallique sans fin (2) est conçue pour tourner autour d’un moyen de guidage (3) et former une zone de traitement avec un contre-élément (5) situé en dehors de la courroie métallique (2). La bande fibreuse (W) est humidifiée au moins sur un côté avant de passer à travers la zone de traitement. Pour humidifier la bande fibreuse (W), l’agent humidifiant est acheminé sur la surface de la bande fibreuse (W) entre 0,2 et 4 secondes avant qu’elle soit transportée vers la zone de traitement. De plus, de 0,01 à 10 grammes d’agent humidifiant par mètre carré sont acheminés, ce qui produit, après le passage à travers la zone de traitement, un volume de bande fibreuse (W) supérieur à 1,40 cm3/g et une rugosité PPS comprise entre 2 et 6 μm.
PCT/FI2009/050433 2008-06-04 2009-05-25 Procede de manipulation d’une bande fibreuse dans une calandre a courroie metallique et dispositif permettant la mise en œuvre de ce procede WO2009147285A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN2009801203320A CN102046880B (zh) 2008-06-04 2009-05-25 对金属带式压光机中的纤维幅材进行处理的方法和实施该方法的设备
DE112009001391T DE112009001391T5 (de) 2008-06-04 2009-05-25 Verfahren zum Behandeln einer Faserbahn in einem Metallriemenkalander und Vorrichtung zum Ausführen des Verfahrens
AT0920709A AT508815A3 (de) 2008-06-04 2009-05-25 Verfahren zum behandeln einer faserbahn in einem metallriemenkalander und vorrichtung zum ausführen des verfahrens

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20085546A FI20085546L (fi) 2008-06-04 2008-06-04 Menetelmä kuiturainan käsittelemiseksi metallihihnakalanterissa sekä menetelmää soveltava laite
FI20085546 2008-06-04

Publications (1)

Publication Number Publication Date
WO2009147285A1 true WO2009147285A1 (fr) 2009-12-10

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ID=39589313

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Application Number Title Priority Date Filing Date
PCT/FI2009/050433 WO2009147285A1 (fr) 2008-06-04 2009-05-25 Procede de manipulation d’une bande fibreuse dans une calandre a courroie metallique et dispositif permettant la mise en œuvre de ce procede

Country Status (5)

Country Link
CN (1) CN102046880B (fr)
AT (1) AT508815A3 (fr)
DE (1) DE112009001391T5 (fr)
FI (1) FI20085546L (fr)
WO (1) WO2009147285A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012007212A1 (fr) * 2010-07-16 2012-01-19 Voith Patent Gmbh Procédé et machine pour fabriquer une bande de matière fibreuse

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI102305B (fi) * 1997-04-02 1998-11-13 Valmet Corp Kalanterointimenetelmä ja menetelmää soveltava kalanteri
FI116980B (fi) * 2003-11-03 2006-04-28 Metso Paper Inc Esikalanterointimenetelmä ja paperin käsittelylinja

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI112266B (fi) * 1997-04-11 2003-11-14 Metso Paper Inc Keraamipinnoitteinen puristintela vaikeisiin korroosio-olosuhteisiin, menetelmä telan valmistamiseksi ja pinnoitekoostumus
FI20020159A (fi) 2002-01-29 2003-07-30 Metso Paper Inc Pinnan muokkauslaite ja laitetta käyttävä menetelmä päällystetyn tai päällystämättömän kuiturainan viimeistelemiseksi
CN100455723C (zh) * 2006-08-23 2009-01-28 江南大学 一种可食性包装纸的制备方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI102305B (fi) * 1997-04-02 1998-11-13 Valmet Corp Kalanterointimenetelmä ja menetelmää soveltava kalanteri
FI116980B (fi) * 2003-11-03 2006-04-28 Metso Paper Inc Esikalanterointimenetelmä ja paperin käsittelylinja

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012007212A1 (fr) * 2010-07-16 2012-01-19 Voith Patent Gmbh Procédé et machine pour fabriquer une bande de matière fibreuse

Also Published As

Publication number Publication date
FI20085546L (fi) 2009-12-05
CN102046880A (zh) 2011-05-04
AT508815A3 (de) 2011-09-15
AT508815A2 (de) 2011-04-15
FI20085546A0 (fi) 2008-06-04
DE112009001391T5 (de) 2011-05-12
CN102046880B (zh) 2012-10-03

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