WO2006134213A2 - Procede et systeme permettant de fabriquer du papier - Google Patents

Procede et systeme permettant de fabriquer du papier Download PDF

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Publication number
WO2006134213A2
WO2006134213A2 PCT/FI2006/000203 FI2006000203W WO2006134213A2 WO 2006134213 A2 WO2006134213 A2 WO 2006134213A2 FI 2006000203 W FI2006000203 W FI 2006000203W WO 2006134213 A2 WO2006134213 A2 WO 2006134213A2
Authority
WO
WIPO (PCT)
Prior art keywords
web
unit
drying
liquid treating
treating agent
Prior art date
Application number
PCT/FI2006/000203
Other languages
English (en)
Other versions
WO2006134213A3 (fr
Inventor
Pekka Linnonmaa
Antti Heikkinen
Hannu LÄTTI
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 AT0923906A priority Critical patent/AT504470A2/de
Priority to JP2008516354A priority patent/JP2008544097A/ja
Priority to DE112006001518T priority patent/DE112006001518T5/de
Publication of WO2006134213A2 publication Critical patent/WO2006134213A2/fr
Publication of WO2006134213A3 publication Critical patent/WO2006134213A3/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/24—Addition to the formed paper during paper manufacture
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/009—Apparatus for glaze-coating paper webs
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems

Definitions

  • the invention relates to a method of manufacturing various paper grades by the same paper machine, wherein the formed and at least partly dried web is treated in a coating unit (20) by spraying a liquid treating agent onto the surface of the web, whereafter the web is influenced in calendering unit (40) by means of heat and compression to at least increase the web's smoothness and, when so desired, its gloss.
  • the invention also relates to an arrangement for manufacturing various paper grades by the same paper machine comprising a means for forming and at least partially drying the web, also comprising a coating unit (20) for treating the web, the coating unit comprising a means for spraying a liquid treating agent onto the surface of the web, whereafter there is a calendering unit (40) in the making direction of the web to at least increase the web's smoothness and, when so desired, its gloss by means of heat and compression.
  • SC paper grade is conventionally made of wood-containing pulp, one of its special manufacturing features being an intensive calendering by a supercalender.
  • these supercalenders used filled rolls and chilled rolls almost exclusively, the web being directed through the nip between the rolls.
  • a so-called reversible nip is used in the middle of the stack formed by the rolls, the sides of the chilled and the filled rolls being changed with respect to the web at this reversible nip.
  • various multi-roll calenders are mostly used instead of the supercalender, their operating principle being almost the same, but instead of the filled rolls, there are stronger polymer-coated rolls provided.
  • the number of nips treating the web has also changed; instead of the former 8 to 12 roll nips, there can be same number of roll nips or, alternatively, various calenders consisting of several sets of rolls, such as those with 3+5, 2+4, 4+5, 3+3 nips, etc.
  • various calenders consisting of several sets of rolls, such as those with 3+5, 2+4, 4+5, 3+3 nips, etc.
  • the properties of the paper grade have remained the same in the respect that the new calenders can also be used to produce paper with similar properties as before.
  • SC paper can be divided into various subtypes SC-A+, SC-A, SC-B+, SC-B, SC-C, the distinguishing factors including gloss and smoothness, raw material, and filler content.
  • the gloss of SC-A is in the order of 46 to 55 % and its roughness from 1.0 to 1.3 ⁇ m, while the corresponding values of SC-C are from 18 to 27 % for gloss and from 1.8 to 2.4 ⁇ m for roughness.
  • Differences that great are not possible by a change in the calendering parameters only but, naturally, to achieve these values, the ingredients contained in the fibrous web deviate from one another, one distinguishing ingredient being ash.
  • ash strongly influences the calendering result.
  • a glossier and smoother paper is obtained by calendering.
  • LWC Light Weight Coated paper
  • SC grade LWC (Light Weight Coated) paper is mainly manufactured from wood-containing, i.e mechanical pulp.
  • this manufacturing process also includes coating, which is carried out before calendering.
  • a typical coating amount of LWC paper is 10 g/m 2 per side, generally totalling 16...25 g/m 2 , which provides a light and smooth surface that is good in reproducing print.
  • various coating methods such as blade coating, size press coating, spray coating, size press coating, curtain coating, etc. To provide better grades, these methods can also be combined; however, in the manufacture of good-quality basic LWC, both sides of the web are coated only once.
  • Publication WO 02/103109 presents quite a versatile selection of factors related to the manufacture of the LWC grade.
  • the purpose of the various ways to change the surface properties of paper is to provide the properties needed by the customer of the paper mill, i.e. the printing house at the time.
  • Typical uses for these paper grades include various newspapers, advertisements, inserts and catalogues.
  • the pigmented newsprint i.e. improved news grade, which provides the roughest print and has a low ash content
  • SC-A gravure paper that enables the best print quality and the LWC offset paper.
  • the printing methods make different demands on paper grades.
  • gravure printing the ink is transferred from the cups on the surface of the printing machine's impression roller onto the surface of the paper to be printed.
  • the smoothness of the printed surface is quite significant for providing a good print quality.
  • the surface is uneven, the ink transfers unevenly from the cup, air bubbles remain under the ink, and the printed figure is not repeated as it is on the surface of the impression roller.
  • various printing inks and patterns are first established onto the surface of the impression roller by means of chemical adhesion, the ink being then ripped off therefrom after adhering to the surface of the paper under compression.
  • this printing method requires surface strength of the printed surface, in particular.
  • the printing ink should come off the interface between the ink and the rubber coating of the com- pression roller. If the printing paper is inappropriate, the paper delaminates at its surface after pressing, i.e., the surface layer of the paper transfers to the surface of the impression roller, causing a failure in printing.
  • US 2003/0056920A1 presents a method and equipment for the on-line calendering of SC-A in a paper production line.
  • the publication suggests that, by placing a moistening device to moisten the surface of the web from 0.6 to 1.2 s before the first nip of a multi-roll calender, paper with the desired surface properties can be manufactured.
  • the moistening device produces fine drops with an average drop size of less than 50 or less than 20 ⁇ m.
  • the publication states that after moistening, the moisture of the web is from 7 to 11 %, i.e., its solids content is from 89 to 93 %.
  • WO 02/103109 presents a method, a paper machine and a base paper for manufacturing LWC that is coated once.
  • the publication shows the selection of suitable components for different structural groups, enabling the exploitation of certain parameters to provide a quality as good as possible for the end product under manufacture.
  • the publication also describes the effect of the parameters used in moistening and coating on the properties of the product that is manufactured.
  • the object of the invention is to provide a manufacturing method and a paper machine, which can be used to produce top-quality printing papers for various purposes according to the circumstances in a way that is easy to select.
  • the demand for different paper grades fluctuates intensively according to the business conditions and the like, and the object of the invention is to provide an arrangement enabling full use of the paper machine investment amid different market conditions.
  • Another object is to extend the grade selection possibly provided by one paper machine to both cover the various SC grades from SC-A+ to SC-C and different LWC grades, such as offset and roto grades.
  • the object of the method is also to provide a versatile arrangement for a wide paper selection for the so-called gradient calendering of paper, wherein the moisture profile of each paper grade to be produced is individually and optimally adjustable in the direction of the thickness or the Z direction before calendering to fully exploit the calendering properties of the base paper.
  • the invention according to the invention is characterized in that, in the method: - the paper grade to be produced is selected, a liquid treating agent being selected according to the paper grade, influencing the web and enabling the features of the paper grade that is produced,
  • the said liquid treating agent can be selected from a group of water, water with additives, surface size and pigment-containing coating agent, and the mixtures thereof,
  • drying process 30 is selected to obtain the desired solids content, in which drying process 30, drying methods and drying powers deviating from one another can be selected between the coating unit 20 and the calendering unit 40,
  • the drying power can be selected from natural drying caused by a clearance to a drying power provided by a combination of several driers 30, 321 , 361 ,
  • the said desired solids content of the web is from 85 to 92 %, the liquid treating agent being water, and from 90 to 95 %, preferably 92 %, the liquid treating agent being the pigment-containing coating agent.
  • the arrangement according to the invention is characterized in containing:
  • control unit that enables the selection of the paper grade to be produced, the liquid treating agent being selectable according to the paper grade, the liquid treating agent enabling the features of the paper grade in question, and the features being recordable in the memory of the control unit;
  • a coating unit 20 comprising a means for spraying various liquid treating agents, the said liquid treating agent being selectable from a group of water, water with additives, surface size and pigment-containing coating agent, and the mixtures thereof,
  • drying unit 30 by which various drying processes can be implemented to obtain the desired solids content before the calendering unit, drying methods and drying powers deviating from one another being selectable in the said drying unit,
  • the drying power being selectable from natural drying caused by a clearance to a drying power provided by a combination of several driers 30, 321 , 361 so that the said desired solids content thus obtained is from 85 to 92 %, the liquid treating agent being water, and from 90 to 95 %, preferably 92 %, the liquid treating agent being the pigment-containing coating agent.
  • the method and the paper machine according to the invention can be used to extend the grade selection produced by the same paper machine from the conventional, relatively small grade selection to a considerably larger one. In this way, it is easy to meet different market conditions and the requirements made by them with- out time-consuming changes and the running-in required by the changes, which almost inevitably would cause a temporary deterioration in the utilization degree and, often, the performance of the paper machine.
  • Using the invention it is thus convenient to produce various paper grades which, however, are top-quality in their respective paper grades. The changes needed are already built in the paper machine; hence, they do not have to be run in in the conventional manner.
  • One preferred feature of the invention is characterized in that the web is treated with the liquid treating agent in one coating unit, which comprises at least a means to spray liquid treating agents with viscosities deviating from one another.
  • the object of the invention was to manufacture quite an extensive paper grade selection which, in practice, would require the use of various liquid treating agents. Conventionally, various water spraying systems are used for the SC paper grades. To manufacture LWC paper grades, pigment-containing coating agents are used, which can be sprayed onto the surface of the web by a spray coating unit.
  • the liquids which include water used in the SC paper grades and the pigment-containing coating agent used in the LWC paper grades, considerably deviate from one another, regarding especially their viscosities and many other properties as well, such as surface tension, abrasiveness, and solidification and drying properties. It is preferable to arrange at least replaceable nozzles for these different types of liquid treating agents, so that a layer of liquid treating agent, which is properly covering and has even patterns, can be sprayed onto the passing web.
  • the decrease in the total solids content of the web is minimized, however, so that at least the web's gloss and smoothness will be characteristic values of the selected paper grade after the calendering unit.
  • One way to implement this is to influence the total solids content of the web after the coating unit by influencing the amount of liquid treating agent fed and the solids content of the liquid treating agent.
  • FIG. 1 shows a diagram of one possible operation mode illustrating the invention
  • FIG. 2 shows a diagram of another possible operation mode illustrating the invention
  • Fig. 3 shows a diagram of an alternative embodiment of the coating unit 20
  • Fig. 4 shows the properties of different paper grades or sub-grades, examined with respect to the gloss and roughness.
  • Fig. 1 shows a diagram of the operation mode according to the invention, wherein the processing of the web advances in the direction of the arrow.
  • the web i.e., the SC or LWC base paper to be manufactured is formed and dried to a sufficient solids content by a paper machine 10 comprising all the processing devices necessary for making the base paper.
  • the coating unit 20 comprises all the devices necessary for spraying the liquid treating agent onto the surface of the moving web during the production.
  • the drying unit 30 takes care of drying the web to a suitable solids content, i.e., inversely, to a suitable moisture before the calendering unit 40.
  • the web is formed by means of heat and compression to increase at least the smoothness and, if so desired, the gloss of the web.
  • a reeling unit 50 of the web reels the web on a roll, which can then be conveyed to further processing, e.g., in a slitter.
  • Measuring units 60 control the quality properties of the web, among others, at suitable stages.
  • One method of implementation is to preferably measure the solids content of the web before the coating unit 20, directly after the coating unit 20 and after the calendering unit 40, the measurement being preferably carried out on both surfaces of the web and through the web, whereby the solids content of the web's surface on both sides and the total solids content of the web can be distinguished.
  • a holding point or a holding element 70 ensures a good runnability of the equipment by maintaining a suitable web tension at each point.
  • the holding point 70 is preferably on the route of the web transfer between the coating unit 20 and the calendering unit 40 to control the tension of the web in the coating unit 20 and before the calendering unit 40.
  • the tension of the web on different sides of the contact point between the web and the holding element can be different with production in progress, and during a conventional production, the holding element and the web are essentially in a non- sliding contact with one another.
  • Fig. 1 also shows in detail the drying unit 30, showing a solution as one possible embodiment, comprising three different web transfer routes 32, 34 and 36.
  • the dwell time of the web between the coating unit 20 and the calendering unit 40 herein can be selected from at least two alternatives 32, 34, 36, which have different web transfer routes.
  • the dwell time the moisture profile in the direction of the web's thickness is influenced for its part so that, between the highest and the lowest moistures in the direction of the web's thickness, a greater difference is provided by a shorter dwell time and a smaller difference is provided by a longer dwell time.
  • the one shown by the reference number 34 is a short cut, on which there are no separate drying means but the web is dried to a moderately low extent, the drying being caused by a clearance.
  • the dwell time between the coating unit and the calendering unit is as short as possible, whereby the moisture contribution in the direction of the web's thickness deviates from the uniform.
  • the solids content of the web's surface after the coating unit can be influenced by the hydrophobicity between the liquid treating agent to be fed and the web. This chemical method can easily be used to adjust the absorption of the liquid into the web.
  • the web transfer routes 32 and 36 are alternatives containing drying solutions that deviate from one another.
  • This drying process 30 may include power-adjustable fluidized bed driers or other through drying machines, infrared driers, clearances and drier combinations thereof; the drier combinations may include one or more of the said driers 30, 321 , 361. Cylinder driers or corresponding driers based on a contact can also be used. The lengths of the web transfer routes 32 and 36 can be different depending on the desired running parameter range.
  • Fig. 2 shows a drying unit 30 in a corresponding place, including one web transfer route; however, the different drying methods and powers required by the different liquid treating agents are implemented by switching various driers on/off and adjusting the power of the driers when necessary.
  • the coating unit 20 in Fig. 1 is presented to be similar to that in Fig. 2, the coating unit 20 including two sets of spraying heads 22 and 24.
  • the liquid treating agent is fed from a container T by means of a pressure production instrument 26 to be sprayed onto the surface of the web.
  • the pipe line includes closing devices 25, which are used to direct the liquid treating agent to a desired spraying head.
  • Fig. 3 shows another possible embodiment containing two systems for the liquid treating agents, including two containers T and two sets of pressure production devices 26.
  • a special advantage of this solution is that the grades can be changed quite quickly without having to wash the system in between, especially when transferring from the production of LWC to that of SC.
  • Another advantage is that the dimensioning of the pipework and the pumps is easier to implement logically, when working closer to the optimal flowing situation of each liquid treating agent with respect to the pressures and the volume flow rates.
  • One disadvantage, of course, is its greater initial investment.
  • the web is influenced by heat and compression at least in one nip, preferably by means of several nips; the nip can be formed by means of rolls, metal belts or belts made of an elastic material, or combinations thereof.
  • the method and the arrangement are controlled by means of a control based on a model or a multivariable control, preferably by means of a learning multivariable control based on a model.
  • a product provided by means of the method and the arrangement can comprise SC and LWC paper grades; to be more precise, the paper grades from SC-A+ to SC-C, news grades and LWC offset and LWC roto grades, by changing the spraying head 22, 24 of the coating unit and, possibly, the web transfer route 32, 34, 36 between the coating unit 20 and the calendering unit 40, and the control parameters, such as the drying process, the said changes being built in the paper machine and available by the control system.
  • Fig. 4 shows the typical properties of the various sub-grades of the SC paper grade manufactured by the method and the paper machine according to the invention, distributed as to the gloss and the roughness. It can be observed from the figure that there is a considerable difference in the roughness and the gloss between SC-A+ and SC-C, which enable the best print quality, and the news grades (News). The difference between these sub-grades is not unambiguous, but for the presented sub-grades, the magnitude is shown in Fig. 4.

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Abstract

L'invention concerne un procédé et un système permettant de fabriquer divers types de papier à l'aide de la même machine à papier. La bande ainsi formée et au moins partiellement séchée est traitée dans une unité de couchage (20) par pulvérisation d'un agent de traitement liquide sur la surface de la bande ; la bande est ensuite influencée dans une unité de calandrage (40) par des moyens thermiques et de compression afin d'augmenter au moins le lissé de la bande et, le cas échéant, sa brillance. Dans ce procédé le type de papier à produire est sélectionné, l'agent de traitement liquide étant sélectionné conformément au type de papier, influençant la bande et produisant les caractéristiques du type de papier produit ; l'agent de traitement liquide peut être choisi dans un groupe constitué d'eau, d'eau avec additifs, d'un agent de couchage contenant un pigment et des mélanges de ces derniers ; le taux de solides voulu de la bande est choisi devant l'unité de calandrage (40) ; un processus de séchage (30) est choisi pour obtenir le taux de solides voulu, au cours duquel des procédés de séchage et des propriétés de séchage déviant les uns par rapport aux autres peuvent être choisis entre l'unité de couchage (20) et l'unité de calandrage (40). La propriété de séchage peut être choisie entre le séchage naturel causé par un écartement et une propriété de séchage obtenue au moyen de la combinaison de plusieurs sécheurs (30, 321, 361). Le taux de solides voulu de la bande est compris entre 85 et 92 %, lorsque l'agent de traitement liquide est l'eau et entre 90 et 95 %, de préférence 92 %, lorsque l'agent de traitement liquide est agent de couchage contenant un pigment.
PCT/FI2006/000203 2005-06-16 2006-06-15 Procede et systeme permettant de fabriquer du papier WO2006134213A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT0923906A AT504470A2 (de) 2005-06-16 2006-06-15 Verfahren und anordnung zur herstellung von papier
JP2008516354A JP2008544097A (ja) 2005-06-16 2006-06-15 紙製造方法及び装置
DE112006001518T DE112006001518T5 (de) 2005-06-16 2006-06-15 Verfahren und Anordnung zur Herstellung von Papier

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20050644 2005-06-16
FI20050644A FI117679B (fi) 2005-06-16 2005-06-16 Menetelmä ja järjestely paperin valmistamiseksi

Publications (2)

Publication Number Publication Date
WO2006134213A2 true WO2006134213A2 (fr) 2006-12-21
WO2006134213A3 WO2006134213A3 (fr) 2007-02-22

Family

ID=34778363

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2006/000203 WO2006134213A2 (fr) 2005-06-16 2006-06-15 Procede et systeme permettant de fabriquer du papier

Country Status (5)

Country Link
JP (1) JP2008544097A (fr)
AT (2) AT504470A2 (fr)
DE (1) DE112006001518T5 (fr)
FI (1) FI117679B (fr)
WO (1) WO2006134213A2 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000003088A1 (fr) * 1998-07-10 2000-01-20 Valmet Corporation Procede et appareil de fabrication de papier calandre
WO2000052266A1 (fr) * 1999-03-04 2000-09-08 Metso Paper, Inc. Procede permettant de gerer l'humidite dans le sens machine d'une bande en cours d'enduction sur une machine a enduire
WO2005042837A1 (fr) * 2003-11-03 2005-05-12 Metso Paper, Inc Procede de precalandrage et chaine de traitement pour papier
EP1614802A1 (fr) * 2004-07-06 2006-01-11 Voith Paper Patent GmbH Procédé et appareil pour le traitement d' une bande de papier ou carton

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000003088A1 (fr) * 1998-07-10 2000-01-20 Valmet Corporation Procede et appareil de fabrication de papier calandre
WO2000052266A1 (fr) * 1999-03-04 2000-09-08 Metso Paper, Inc. Procede permettant de gerer l'humidite dans le sens machine d'une bande en cours d'enduction sur une machine a enduire
WO2005042837A1 (fr) * 2003-11-03 2005-05-12 Metso Paper, Inc Procede de precalandrage et chaine de traitement pour papier
EP1614802A1 (fr) * 2004-07-06 2006-01-11 Voith Paper Patent GmbH Procédé et appareil pour le traitement d' une bande de papier ou carton

Also Published As

Publication number Publication date
FI20050644A0 (fi) 2005-06-16
FI117679B (fi) 2007-01-15
AT504470A2 (de) 2008-05-15
DE112006001518T5 (de) 2008-05-08
WO2006134213A3 (fr) 2007-02-22
AT10904U1 (de) 2009-12-15
JP2008544097A (ja) 2008-12-04

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