EP2725136A1 - Procédé et chaîne de production et production de toiles de fibre - Google Patents

Procédé et chaîne de production et production de toiles de fibre Download PDF

Info

Publication number
EP2725136A1
EP2725136A1 EP12189882.9A EP12189882A EP2725136A1 EP 2725136 A1 EP2725136 A1 EP 2725136A1 EP 12189882 A EP12189882 A EP 12189882A EP 2725136 A1 EP2725136 A1 EP 2725136A1
Authority
EP
European Patent Office
Prior art keywords
starch
fiber web
sizing
calendering
moisturizing
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.)
Withdrawn
Application number
EP12189882.9A
Other languages
German (de)
English (en)
Inventor
Reijo PIETIKÄINEN
Jukka Heimonen
Topi Tynkkynen
Henri Vaittinen
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.)
Valmet Technologies Oy
Original Assignee
Metso Paper Oy
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 Oy filed Critical Metso Paper Oy
Priority to EP12189882.9A priority Critical patent/EP2725136A1/fr
Publication of EP2725136A1 publication Critical patent/EP2725136A1/fr
Withdrawn legal-status Critical Current

Links

Images

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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/16—Sizing or water-repelling agents
    • 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D21H17/28—Starch
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/54—Starch
    • 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
    • D21H23/50—Spraying or projecting
    • 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
    • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
    • D21H23/56—Rolls
    • 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
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
    • D21H25/12—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod
    • D21H25/14—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod the body being a casting drum, a heated roll or a calender

Definitions

  • the invention relates to producing fiber webs, in particular paper and board webs. Especially the invention relates to a method for producing fiber webs according to the preamble of claim 1 or 2 and to a production line for producing fiber webs according to the preamble of claim 14.
  • 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 sizer, a pre-calender, a coating section, a final-calender.
  • the production and treatment line also comprises at least one slitter-winder for forming customer rolls as well as a roll packaging apparatus.
  • fiber web are meant for example a paper and board webs.
  • sizing is used to alter the properties of a fiber web by adding sizing agents, for example starch or other sizing agents.
  • sizing agents for example starch or other sizing agents.
  • surface sizing the sizing agent is added onto the surface of the fiber web at the dry end of the fiber web machine.
  • Surface sizing is used in production of many fiber web grades, for example of uncoated fine papers and of several board grades.
  • Pre-calendering is typically used for creating required surface properties for further treatment for example for coating.
  • 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 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 often 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 nips can be formed also by using instead one of rolls 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.
  • Further web treatment producing web smoothing effect can be done in various hot pressing contact treatment processes, like Condebelt -drying, BoostDryer -drying, metal belt drying or treatment, Yankee cylinder drying, MG-cylinder drying etc. cylinder drying.
  • the applied heat can be used to raise the surface temperature of the fiber web to glass transition temperature, which causes the fibers to soften and conform to the surface of the roll.
  • Moisture for example water or steam can also be added before the nip to the surface to be treated to further lower the glass transition temperature.
  • the gradients in the temperature and moisture level tend to lower the glass transition temperature preferentially on the external surfaces of the fiber web and allow the web to achieve a desired smoothness without significant reduction in caliber.
  • WO publication 99/25921 is disclosed a method for detecting contamination that runs through a nip or nips in a calender, in which method vibrations occurring in connection with the constructions of calender are detected and processed.
  • the source of unusual vibrations is located, which makes it possible to start eliminating the contaminations or to replace the damaged part.
  • US patent publication 6274001 is disclosed a calendering method in which lubricant is applied to both sides of the web to prevent fiber sticking/picking in the hot nip.
  • the lubricant may be applied by the sizer, by the moisturizing showers or by separate lubricant showers.
  • the reactive part of a starch molecule is a hydroxyl group due to which one of the basic properties of starch is water solubility. Dried starch in sized fiber web is soluble in water and thus it sticks to for example calender rolls, if water is applied. This is preventing the use of water moisturizing in calendering of starch sized fiber webs even though the moisturizing before calendering would be very advantageous particularly due to enhanced moisture gradient calendering effect.
  • the water solubility of starch can be decreased by modifying starch or by adding chemicals that prevent solubility. It is known for example to decrease water solubility of a starch based binding agent of a coating medium by the above means in order to prevent starch dissolving due to water based printing colors in offset printing or to improve wet rub-off properties of fiber webs.
  • Sticking and picking problems at heated calender rolls may also occur with other sizing agents especially when moisturizing and/or high moisture content before calendering is used.
  • 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 multiply 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 birch wood 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 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.
  • moisture gradient calendering utilize the Z-directional temperature and moisture profiles in the fiber web.
  • the fiber plasticization, and therefore the deformation of web structure in calender nip compression, is more concentrated to the surface layers due to favorably adjusted moisture and temperature profiles in Z-direction.
  • the moisture gradient calendering can offer very high smoothness while maintaining the inner web structure less compacted and thus keeping the bulk at a reasonable level.
  • the moisture gradient is in practice obtained by first drying the paper web to sufficiently dry and then applying water on to the web surface. Water is applied usually by water showers (spray nozzles). Water can be applied also by steam boxes (or pipes) and letting the steam to condensate at web surface, giving some moistening effect.
  • Moisture gradients in web thickness direction may arise also from one-sided heating, for example in Condebelt drying, hot metal belt and hot drying cylinder contacts. Moisture is transported from the hot side towards cooler side, and possibly condensing there at the cooler surface. In this case, redistribution of internal water results high local moisture content at the surface.
  • Starch sizing is used in order to improve paper web properties, in particular water resistance, water absorption properties, strength, internal strength and bending stiffness. In addition, runnability as well as dusting tendency can be affected favorably.
  • Starch based sizes are known to be water soluble. This will pose a major problem in moisture gradient calendering when sized paper is first moistened and soon after that calendered. It has been observed, that moistening of starch sized webs prior to hot calendering leads to problems like sticking, starch picking and deposit building on the calender roll surfaces. It is believed, that the applied water is dissolving the dried starch film in the web surface layers. The dissolved starch can be transported, particularly with water movement, into a direct contact with roll surface. The mechanism of sticking and picking is not well known, but it can be assumed, that at hot roll surface the water is evaporated while the size (binder) remains at the surface contact. The binder is adhered to and possibly held by sticky bonds at the metal surface.
  • the root cause to the roll picking seems to be the water dissolving property of the binder. In order to solve the root cause in practical applications, it is important understand the binder chemistry in relation to its water dissolution.
  • starch dissolution to water can be approached in different ways.
  • the most obvious solution is to use as small amounts of water as possible, but this is diminishing the benefits of the moisture gradient calendering.
  • the starch dissolving and picking at the calender can be prevented when the process is arranged in such way that starch and water are not brought together in to a contact before calendering. If water-soluble starch needs to be used, sizing must then be done after the water-critical calendering.
  • An object of the invention is to create a method and a production line for producing fiber webs in which the above problems and disadvantages are eliminated or at least minimized.
  • a particular object is to prevent starch sticking from wet / moistened fiber web into the contacting surfaces, particularly hot drying surfaces and hot calendering surfaces.
  • the method for producing fiber webs according to the invention is mainly characterized by the features of claim 1 or 2 and the production line for producing fiber webs according to the invention is mainly characterized by the features of claim 14.
  • starch dissolution chemicals like insolubilizers
  • other means like starch modification
  • starch dissolution chemicals like insolubilizers
  • the soluble binder like starch
  • the sizing agent can also be a sizing agent with an insolubilizer additive for decreasing the solubility.
  • additional chemicals like lubricants, roll surface passivation agents or cleaning chemicals, are applied either directly on the web, or mixed with moistening water or applied directly to the roll surface or mixed with sizing agent.
  • the fiber web in which the fiber web is surface sized and moisturized by water and/or by steam and calendered or correspondingly treated by pressure, the fiber web is surface sized by applying low soluble starch, such as maize starch or wheat starch or barley starch or rice starch, or other sizing agent and the fiber web is moisturized and treated by contact pressure treatment, for example by calendering or drying.
  • the starch can be natural starch or genetic modified starch.
  • starch properties like viscosity, solubility and strength building characteristics are inherited from the starch composition and chemical structure at the molecular level.
  • proportions of the amylose and amylopectin molecules, the degree of polymerization, and molecular weight of the polymer structure affect the end use properties.
  • chemical nature and therefore the end use properties vary greatly depending on the source of the starch, for example giving higher solubility to the potato starch due to the higher amylopectin proportion, more branched molecular chains and in general more loose amorphous macromolecular structure.
  • the chemical structure and chemical characteristics of the starch can be modified also using means of genetic modifications. In this way, using genetically improved starch, it is possible to increase desired functionality and properties, like strength, and remove the less desired features, such as water solubility.
  • the internal moisture content in the web is kept low as possible during the moistening and calendering stages of the sized web.
  • the lower base sheet moisture is reducing the picking risk and enhancing the moisture gradient calendering effect.
  • a starch size with chemical additive decreasing water solubility of the dried starch size is applied into the web and the fiber web is dried in which in at least one process step following the sizing water is added into the fiber web by water moisturizing means or by steaming means of by other corresponding moisturizing means, and/or in at least one process step following the sizing the fiber web is treated by a hot surface contacting a side of the fiber web that is moist and sized, and/or in at least one process step following the sizing the fiber web is dried and/or calendered by a hot surface.
  • the calendering or treating the web by a hot surface is in belt calendering 100 - 200 °C, in roll nip calendering 1 30 - 350 °C, in cylinder or belt drying 80 - 200 °C is and the sizing is internal or surface sizing.
  • sizing amount is per side 0,1 - 5 g/m 2 (solids), preferably for paper webs per side 0,1 - 2 g/m 2 and for board webs per side 0,5 - 3 g/m 2 , web ingoing moisture 4 - 10 %, preferably 5 - 8 %, water application (moistening) 1 - 3 g/m 2 for paper webs for one side of the web and 2 - 6 g/m 2 for board webs for one side of the web, thermo roll temperature 130 - 350 °C, preferably 17 5 - 250 °C.
  • At least one of the calendering surfaces is provided by oil-heated roll, and the sizing is internal or surface sizing.
  • the hot calendering is done by surfaces, wherein at least one of the surfaces is a high surface temperature roll, preferably a hot oil heated thermo roll, which has surface temperature over 150 °C, preferably over 175 °C.
  • a hot oil heated thermo roll which has surface temperature over 150 °C, preferably over 175 °C.
  • the hot roll is a high power shrink fitted thermo roll.
  • the calendering is done with metal belt calender, wherein the temperature of the metal belt is 100 - 200 °C.
  • the fiber web is dried and calendered in a metal belt contact zone, wherein at least one of the surfaces has surface temperature 100 - 200 °C.
  • the water solubility of starch is decreased by additives provided in sizing process to create water resistant starch sizing in connection with hot calendering.
  • hot calendering the temperatures of calender rolls can be 130 °C - 350 °C and the rolls are advantageously heated by oil circulation.
  • water moisturizing it is further possible to use water moisturizing. This provides for great quality advantages in particular in hot calendering. For example smoothness is improved, raw material can be saved and process can be designed simpler.
  • the additive decreasing water solubility of starch creates covalent or hydrogen bonds with the hydroxyl groups of the starch and/or works as a cross-linker.
  • the additive is activated after it is applied by drying of the sized fiber web and by effect of the temperature. When activated, the additive creates bonds with the hydroxyl groups in the starch, cross-linking and passivizing the hydroxyl groups and thus preventing the adherence of water molecule bonding with them.
  • a low soluble starch for example corn starch, rice starch or wheat starch, or other sizing agent that is less soluble in moisturizing is used as sizing agent and thus sticking of the binder or sizing agent to the calender rolls or other corresponding contacting surface of a treatment device is avoided.
  • the moisturizing is provided by water spray means just before calendering.
  • the sizing agent applied on the fiber web is modified by adding insolubilizers and thus the dissolving and sticking of sizing agent onto the surfaces of calender rolls and other corresponding process surfaces of fiber web production line devices is decreased.
  • insolubilizers When less soluble starch or sizing agent is used it is possible to use increased moisture addition and thus for example better calendering results are achieved.
  • insolubilizers for example zirconium based salts, such as AZC (Ammonium Zirconium Carbonate) or PZC (Potassium Zirconium Carbonate) or Glyoxal resins can be used. Also formaldehyde resins or CMC, polycarboxylic acids like citric acid can be used as insolubilizers.
  • zirconium based salts such as AZC (Ammonium Zirconium Carbonate) or PZC (Potassium Zirconium Carbonate) or Glyoxal resins
  • formaldehyde resins or CMC polycarboxylic acids like citric acid can be used as insolubilizers.
  • the surface sizing is done with spray sizing but also other sizing methods can be used.
  • the fiber web production comprises following steps: sizing with starch or sizing agent with insolubiliser additive, drying of fiber web at drying section, moisturizing and calendering or corresponding contacting press treatment.
  • the fiber web production comprises following steps: sizing with starch with additives decreasing water solubility, drying, water moisturizing and hot calendering.
  • the fiber web production comprises applying starch or other sizing agent with additive insolubilizer on the fiber web before moisturizing at calender or before calendering.
  • the fiber web production comprises following steps: sizing with starch or sizing agent with insolubilizer additive, contactless drying, contact drying or metal belt treatment or calendering.
  • the surface sizing with starch or other sizing agent is performed after calendering.
  • the sticking problems are avoided.
  • the sizing may increase the surface roughness, this can be compensated by calendering the fiber web to higher smoothness level than desired and thereafter by sizing reach the desired smoothness level.
  • a high solids content starch can be used to minimize the added water amount, thus reducing re-swelling and roughening of the fiber web.
  • the fiber web production comprises following steps: internal (stock) sizing of the base fiber web with starch or other sizing agent, drying, calendering or corresponding contacting press treatment and surface sizing.
  • the fiber web production comprises following steps: internal (stock) sizing of the base fiber web with starch or other sizing agent, drying, calendering or corresponding contacting press treatment, surface sizing, coating and final-calendering.
  • a spray-sizer or a pond-sizer can be used.
  • calender for example a hard nip calender, a soft calender, a multinip calender, a wet stack calender or a metal belt calender or a shoe calender can be used.
  • moist fiber web is dried by contact drying and/or by belt drying.
  • the surface sizing is performed in high dry solids content so that less water is applied on the surface of the fiber web.
  • the solids content level is during sizing preferably 10 - 25 %.
  • the sizing can even have a smoothness increasing effect if sizing is combined with a wet stack calender or with a hard nip calender.
  • sticking problems can be decreased by using passivation and/or lubrication chemicals applied on the surface of the calender roll or the corresponding surface with sticking problems or by adding the passivation and/or lubrication chemical into the moisturizing agent at calender or before calender or by adjusting temperature and moisture amount.
  • Lubricants or passivation chemicals can be: directly applied to the web before calendering, mixed with surface sizing agent, mixed with moisturizing water or directly applied to the calendering surface.
  • the temperature of the web at ingoing to the calendering is 20 - 80°C, preferably 30 - 50 °C.
  • drying temperature of the sized web is over 60 °C, preferably over 80 °C, which ensures rapid curing of insolubilizers, added to the web.
  • the size treated web is arranged to stay under drying conditions where the temperature is over 60 °C at least for 2 seconds.
  • the size treated web is dried with high temperature impingement drying or in contactless airborne drying, preferably flotation dryer.
  • less soluble starch for example corn starch
  • minimized moisture amount for example less than 2 g/m 2
  • high roll temperatures for example over 175 °C, advantageously over 200 °C
  • passivation and /or lubrication chemicals are used in combination to eliminate sticking problems.
  • the invention makes it possible to use water moisturizing in increased amounts, and particularly enhanced moisture gradient calendering in hot calendering in production of starch sized fiber webs.
  • Various kinds of calender types are utilizable, for example long nip calendering.
  • the possibility of moisturizing also makes the calendering more efficient and thus quality results and production capacity improve.
  • the water resistance and strength properties (like surface strength and bending stiffness) of the fiber web are improved without reduction of water absorption or plasticization properties of the fiber web.
  • the invention also provides the possibility of replacing more expensive sizing agents by starch in production lines comprising water moisturizing. Further important benefit is the possibility of controlling curl, controlling one-sidedness and/or web profiling by water moisturizing of starch sized fiber webs.
  • table 1 some properties of dried starch films obtained from various cooked native starches and there are differences in solubility of different starch types, as can be seen from Table 1.
  • potato starch and tapioca starch have high solubility but for example maize starch and wheat starch have lower solubility.
  • rice starch is of low solubility.
  • the applicant has noted in trial tests that potato starch that has high solubility in water tends to stick after moisture addition to calender rolls more easily than maize starch that has lower solubility.
  • the potato starch has been found to stick after 1 - 2 g/m 2 or more moisture addition but the maize starch only after 2 - 4 g/m 2 or more moisture addition in hot calendering contact.
  • Starch dissolving and roll picking in a moisture gradient calendering was simulated using laboratory scale calendering equipment. The tests aimed to estimate the starch dissolving and picking in a quantitative way as water was applied on web surface prior a hot calender nip.
  • Test material was typical surface sized board (250 g/m 2 folding boxboard). Sheets were cut from surface sized web containing 2 - 3.5 g/m 2 (dry amount) starch on both sides. Test sheets were conditioned into equilibrium moisture contents 5 %, 8 % and 10 %. Calendering was done at 150 °C temperature and water was applied by spray nozzles just before sheet entered calender nip. Water amount used was generally 0 - 5 g/m 2 .
  • the figure 1 explains sheet base moisture effect on starch picking.
  • the bottom axis indicates used water amount and vertical axis indicates evaluated picking intensity value.
  • higher basis moisture (10 %) gives higher picking compared to lower basis moisture (5%) at all moisturizing levels.
  • Running without water (no moisturizing) is practically picking free in both cases.
  • Calendering temperature was 150 °C.
  • An acceptable picking level defined being ⁇ 0.5 , one can see that picking free situation is obtained with ⁇ 1 g/m 2 moisturizing water in the case of 10 % base moisture and with ⁇ 2 g/m 2 moisturizing water with 5 % base moisture, respectively. Therefore sheet basis moisture before calendering is greatly affecting the picking at calendering.
  • FIGS 5 - 13 are schematically shown examples of production lines for producing fiber webs.
  • FIG 5 is an on-line paper or board making line for producing uncoated web
  • in figure 6 is an on-line paper or board making line for producing coated web
  • in figure 7 is an on-line paper or board making line with sizing for producing uncoated web
  • in figure 8 is an on-line paper or board making line with sizing, for producing coated web
  • in figure 9 is an off-tine paper or board making line with sizing and coating
  • in figure 10 is an off-line paper or board making line with sizing
  • in figure 11 is an on-line paper or board making line with calendering and sizing
  • in figure 12 is an on-line paper or board making line with pre-calendering, sizing, coating and final calendering
  • in figure 13 is an on-line paper or board making line with integrated sizing, smoothening contact treatment, coating and calendering.
  • same reference signs are used for corresponding parts and sections of the
  • the production and treatment line according to the examples of figure 5 - 13 comprises paper or board machine 10, which has a head box, a wire section and a press section as well as a subsequent drying section.
  • the fiber web W is guided from stock sizing S to the paper or board machine 10 with drying.
  • the drying is followed by moistening by a moistening device 35 of the fiber web W before calendering in a calender 40 and finally reeled in a reel-up 80 to a parent roll.
  • the fiber web W is guided from stock sizing S to the paper or board machine 10 with drying.
  • the drying is followed by moistening by a moistening device 35 before precalendering in a calender 40.
  • a coating section 40 which comprises a coating device and drying section.
  • the coating section 50 is followed by final calendering in the end calender 60 and finally the fiber web W is reeled in a reel-up 80 to a parent roll.
  • the fiber web W is guided from stock sizing S to the paper or board machine 10 with drying.
  • the drying is followed by sizing in a sizer 20 and dried thereafter by a drying device 25.
  • the fiber web is moistened by moistening devices 35 before calendering in a calender 40 and finally the fiber web W is reeled in a reel-up 80 to a parent roll.
  • the fiber web W is guided from stock sizing S to the paper or board machine 10 with drying.
  • the drying is followed by sizing in a sizer 20 and dried thereafter by a drying device 25 and moistened by moistening devices 35 before precalendering in a calender 40.
  • a coating section 40 which comprises a coating device and drying section.
  • the coating section 50 is followed by final calendering in the end calender 60 and finally the fiber web W is reeled in a reel-up 80 to a parent roll.
  • the fiber web W is guided from stock sizing S to the paper or board machine 10 with drying.
  • the drying is followed by sizing in a sizer 20 and dried thereafter by a drying device 25 and reeled in a reel-up 80 to a parent roll.
  • the parent roll is unwound in an unwinder 85 and moistened by moistening devices 35 before calendering in a calender 40.
  • a coating section 50 which comprises a coating device and drying section and at the end of the off-line part the fiber web W is reeled in a reel-up 80 to a parent roll.
  • the fiber web W is guided from stock sizing S to the paper or board machine 10 with drying.
  • the drying is followed by sizing in a sizer 20 and dried thereafter by a drying device 25 and reeled in a reel-up 80 to a parent roll.
  • the parent roll is unwound in an unwinder 85 and moistened by moistening devices 35 before calendering in a calender 40 and at the end of the off-line part the fiber web W is reeled in a reel-up 80 to a parent roll.
  • the fiber web W is guided from stock sizing S to the paper or board machine 10 with drying.
  • the drying is followed by moistening by a moistening device 35 before precalendering in a precalender 40.
  • the fiber web W is sized in a sizer 20 and dried thereafter by a drying device 25.
  • the sizer 20 and its drying device 25 are followed by optional final calendering in the end calender 60 and finally the fiber web W is reeled in a reel-up 80 to a parent roll.
  • the fiber web W is guided from stock sizing S to the paper or board machine 10 with drying.
  • the drying is followed and moistening by a moistening device 35 before precalendering in a calender 40.
  • the fiber web W is sized in a sizer 20 and dried thereafter by a drying device 25.
  • the fiber web W is coated in a coating section 50 which comprises a coating device and drying section.
  • the coating section 50 is followed by final calendering in the end calender 60 and finally the fiber web W is reeled in a reel-up 80 to a parent roll.
  • the fiber web W is guided from stock sizing S to the paper or board machine 10 with integrated sizing and smoothening contact drying and/or treatment with initial drying 15, which is followed by a sizer 20 and dried thereafter by a drying device 25 for predrying and curing.
  • a drying device 25 for predrying and curing.
  • the fiber web is moistened by moistening devices 35 for control of water profile before drying in a drying section 45 comprising contact drying and/or smoothening metal belt treatment and curing.
  • the fiber web W is coated in a coating section 50 which comprises a coating device and drying section.
  • the coating section 50 is followed by final calendering in the end calender 60 and finally the fiber web W is reeled in a reel-up 80 to a parent roll.
  • the fiber web is moisturized by at least one moisturizing device 35, for example by water moisturizing by sprays or by steam moisturizing with moisture amount of 1 - 10 g/m 2 , preferably 1 - 5 g/m 2 .
  • the calenders 40, 60 of the examples can be for example a soft calenders or a hard nip calenders or a metal belt calenders or multinip calender.
  • the possible insolubilizer is added as last step in size preparation, just before the application onto the web.
  • the chemical additive amount is for example 1 - 8% of the dry solids content of the starch.
  • the chemical is activated at drying section as water is removed and/or elevated temperature is enhancing the chemical additive curing. Due to the chemical the water solubility of the starch is lowered, which provides for the possibility of water moisturizing with greater water amounts without contamination of calender rolls. The water moisturizing with greater water amounts together with hot calendering improves the calendering results and the surface of the web when entering the coating is smoother. Thus the smoothness of the end product is better in relation to bulk and the amount of coating medium used can be decreased.
  • the chemical additive has also strength improving effect and thus the amount of starch used can be decreased.
  • the smoothing effect by the calender is improved and thus for example the Yankee cylinder can be removed from the production line without negative effect to the quality of the fiber web as the smoothening effect of the Yankee cylinder is no more so significant.
  • the production speed of the production line can be increased for example by increasing the capacity (the length) of the drying section.
  • the better smoothness and increased strength gives advantage in many ways. Increase in strength enables reduction of fiber raw materials, replacing some fiber material by cheaper filler material or by cheaper recycled fibers.
  • Better calendering result (smoothness) enable reduction of calendering line load which means bulk savings. Bulk saving means more thickness and more bending stiffness. The better smoothness thus provides for bulk and raw material savings.
  • the invention provides for the possibility of simple and cost effective line concept, for example hard calender and water moisturizing in conjunction of efficient production line.
  • This example is suitable for example in production of boards (FBB, liners etc.) and of uncoated or coated printing papers (WFU, LWC, MWC etc.).
  • the starch sized fiber web is moisturized and end calendered.
  • This example is suitable for example in production of wood-free sized paper grades, for example copy papers.
  • the starch is used to improve strength properties and increasing surface strength, decreasing dusting etc.
  • wood containing or wood-free uncoated printing paper grades are sized or pigmented with insolubilized starch before moistening and calendering.
  • the starch sized fiber web is contact dried.
  • the sizing by water resistant starch is followed by contact drying, either cylinder drying or drying-treatment by hot metal belt.
  • the lower solubility of starch enables picking and contamination free operation

Landscapes

  • Paper (AREA)
EP12189882.9A 2012-10-25 2012-10-25 Procédé et chaîne de production et production de toiles de fibre Withdrawn EP2725136A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12189882.9A EP2725136A1 (fr) 2012-10-25 2012-10-25 Procédé et chaîne de production et production de toiles de fibre

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12189882.9A EP2725136A1 (fr) 2012-10-25 2012-10-25 Procédé et chaîne de production et production de toiles de fibre

Publications (1)

Publication Number Publication Date
EP2725136A1 true EP2725136A1 (fr) 2014-04-30

Family

ID=47143570

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12189882.9A Withdrawn EP2725136A1 (fr) 2012-10-25 2012-10-25 Procédé et chaîne de production et production de toiles de fibre

Country Status (1)

Country Link
EP (1) EP2725136A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113308941A (zh) * 2021-06-23 2021-08-27 大连中阜安耐新材料有限公司 一种抗病毒包装纸的制备方法
EP3964644A1 (fr) * 2020-09-02 2022-03-09 Valmet Technologies Oy Calibreur
CN115852740A (zh) * 2018-04-05 2023-03-28 纤维精益技术有限公司 具有用于造纸机湿端的水平射流施加器的方法

Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3145116A (en) 1960-07-07 1964-08-18 Miles Lab Insolubilization of starches with dialdehyde polysaccharides
US3425896A (en) * 1966-11-21 1969-02-04 Oxford Paper Co Starch coating insolubilized with a zirconium salt
US5114999A (en) 1989-04-03 1992-05-19 Ppg Industries, Inc. Glyoxal-containing binder insolubilizer
EP0603727A1 (fr) * 1992-12-23 1994-06-29 National Starch and Chemical Investment Holding Corporation Procédé de fabrication de papier utilisant des amidons réticulés cationiques/amphotères
US5460645A (en) * 1993-01-28 1995-10-24 Pandian; Verson E. Use of zirconium salts to improve the surface sizing efficiency in paper making
WO1999025921A1 (fr) 1997-11-17 1999-05-27 Valmet Corporation Procede de detection d'impuretes et/ou d'endommagement d'une face passant a travers une ligne de contact ou des lignes de contact dans une calandre pour papier
WO1999041453A1 (fr) * 1998-02-17 1999-08-19 Hercules Incorporated Encollage de papier
WO2000049226A1 (fr) * 1999-02-17 2000-08-24 Stora Kopparbergs Bergslags Aktiebolag (Publ) Composition d'encollage, procede de fabrication de papier ou de carton colle, et papier colle et carton colle
WO2000058412A1 (fr) * 1999-03-31 2000-10-05 Penford Corporation Compositions pour couchage de papier renfermant un melange de gomme gellane et d'amidon
US6274001B1 (en) 1997-10-21 2001-08-14 International Paper Company Method for calendering surface sized paper/paperboard to improve smoothness
US6300393B1 (en) 1997-11-17 2001-10-09 Alice P. Hudson Insolubilizing additives for paper coating binders and paper surface size
EP1338699A1 (fr) * 2002-02-08 2003-08-27 AKZO Nobel N.V. Dispersion de collage
US6645349B1 (en) 1998-01-20 2003-11-11 Valmet Corporation Method and device for conditioning of a roll, in particular of a roll in a paper machine or in a paper finishing device
US6905573B2 (en) 2000-09-06 2005-06-14 Metso Paper, Inc. Method and equipment for cleaning and maintaining rolls
US20080163993A1 (en) * 2007-01-10 2008-07-10 Varnell Daniel F Surface sizing with sizing agents and glycol ethers
US20110240242A1 (en) * 2010-04-02 2011-10-06 International Paper Company Method and system using low fatty acid starches in paper sizing composition to inhibit deposition of multivalent fatty acid salts

Patent Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3145116A (en) 1960-07-07 1964-08-18 Miles Lab Insolubilization of starches with dialdehyde polysaccharides
US3425896A (en) * 1966-11-21 1969-02-04 Oxford Paper Co Starch coating insolubilized with a zirconium salt
US5114999A (en) 1989-04-03 1992-05-19 Ppg Industries, Inc. Glyoxal-containing binder insolubilizer
EP0603727A1 (fr) * 1992-12-23 1994-06-29 National Starch and Chemical Investment Holding Corporation Procédé de fabrication de papier utilisant des amidons réticulés cationiques/amphotères
US5460645A (en) * 1993-01-28 1995-10-24 Pandian; Verson E. Use of zirconium salts to improve the surface sizing efficiency in paper making
US6274001B1 (en) 1997-10-21 2001-08-14 International Paper Company Method for calendering surface sized paper/paperboard to improve smoothness
WO1999025921A1 (fr) 1997-11-17 1999-05-27 Valmet Corporation Procede de detection d'impuretes et/ou d'endommagement d'une face passant a travers une ligne de contact ou des lignes de contact dans une calandre pour papier
US6300393B1 (en) 1997-11-17 2001-10-09 Alice P. Hudson Insolubilizing additives for paper coating binders and paper surface size
US6645349B1 (en) 1998-01-20 2003-11-11 Valmet Corporation Method and device for conditioning of a roll, in particular of a roll in a paper machine or in a paper finishing device
WO1999041453A1 (fr) * 1998-02-17 1999-08-19 Hercules Incorporated Encollage de papier
WO2000049226A1 (fr) * 1999-02-17 2000-08-24 Stora Kopparbergs Bergslags Aktiebolag (Publ) Composition d'encollage, procede de fabrication de papier ou de carton colle, et papier colle et carton colle
WO2000058412A1 (fr) * 1999-03-31 2000-10-05 Penford Corporation Compositions pour couchage de papier renfermant un melange de gomme gellane et d'amidon
US6905573B2 (en) 2000-09-06 2005-06-14 Metso Paper, Inc. Method and equipment for cleaning and maintaining rolls
EP1338699A1 (fr) * 2002-02-08 2003-08-27 AKZO Nobel N.V. Dispersion de collage
US20080163993A1 (en) * 2007-01-10 2008-07-10 Varnell Daniel F Surface sizing with sizing agents and glycol ethers
US20110240242A1 (en) * 2010-04-02 2011-10-06 International Paper Company Method and system using low fatty acid starches in paper sizing composition to inhibit deposition of multivalent fatty acid salts

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Papermaking Science and Technology", 1999, FAPET OY, pages: 362

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115852740A (zh) * 2018-04-05 2023-03-28 纤维精益技术有限公司 具有用于造纸机湿端的水平射流施加器的方法
EP3964644A1 (fr) * 2020-09-02 2022-03-09 Valmet Technologies Oy Calibreur
CN113308941A (zh) * 2021-06-23 2021-08-27 大连中阜安耐新材料有限公司 一种抗病毒包装纸的制备方法

Similar Documents

Publication Publication Date Title
US9322135B2 (en) Method for producing fiber webs and production line for producing fiber webs
EP1784535B1 (fr) Appareil de transformation de nappe fibreuse comprenant une courroie metallique en boucle
EP2682520B1 (fr) Procédé de production d'une bande fibreuse et ligne de production d'une bande fibreuse
US20060060322A1 (en) Processing device for processing a coated or uncoated fibrous web
EP3617403B1 (fr) Procédé de traitement d'une bande de matière fibreuse et système de traitement pour le traitement d'une bande de matière fibreuse
KR20040086315A (ko) 처리장치와 코팅 또는 미코팅 섬유웨브를 처리하기 위한장치를 작동하는 방법
EP2725136A1 (fr) Procédé et chaîne de production et production de toiles de fibre
EP3012371A1 (fr) Procédé de traitement d'une bande de matière fibreuse et calandre de pour traiter une bande de matière fibreuse
EP2725137A1 (fr) Procédé et chaîne de production et production de toiles de fibre
FI122859B (fi) Menetelmä ja laitteisto paperin/kartongin pintakäsittelemiseksi
WO2000055424A1 (fr) Procede et dispositif permettant de fabriquer du papier couche, et papier couche
US7943010B2 (en) Method of making surface-sized paper/board
WO2009077643A1 (fr) Calandre à bande métallique
EP3988713B1 (fr) Procédé de traitement d'une bande de matière fibreuse et système de traitement pour le traitement d'une bande de matière fibreuse
US9133580B2 (en) Method for modernizing a multiroll calender, in particular for modernizing a supercalender and a modernized multiroll calender, in particular a modernized supercalender
EP3231936B1 (fr) Procédé de production de bandes de materiau fibreux
WO2002000998A1 (fr) Procede de pre-calandrage, procede de finition et appareil de mise en oeuvre des procedes
FI128040B (en) Method of treating a fibrous web and treatment system for treating a fibrous web
EP1980666A1 (fr) Fibres mécaniques dans un papier xérographique
WO2009147285A1 (fr) Procede de manipulation d’une bande fibreuse dans une calandre a courroie metallique et dispositif permettant la mise en œuvre de ce procede
EP2682521A1 (fr) Procédé et dispositif pour le traitement d'une feuille fibreuse
WO2005031064A1 (fr) Procede pour reguler les caracteristiques structurelles et fonctionnelles d'une bande de matiere fibreuse dans un dispositif de traitement pour bande de matiere fibreuse
WO2012059635A2 (fr) Procédé et appareil de collage en surface de bande fibreuse
FI20185723A1 (en) Method of treating a fibrous web and treatment system for treating a fibrous web

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20121025

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: VALMET TECHNOLOGIES, INC.

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20141031