EP3231936B1 - Procédé de production de bandes de materiau fibreux - Google Patents

Procédé de production de bandes de materiau fibreux Download PDF

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Publication number
EP3231936B1
EP3231936B1 EP16164657.5A EP16164657A EP3231936B1 EP 3231936 B1 EP3231936 B1 EP 3231936B1 EP 16164657 A EP16164657 A EP 16164657A EP 3231936 B1 EP3231936 B1 EP 3231936B1
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EP
European Patent Office
Prior art keywords
fiber web
drying
calendering
calender
web
Prior art date
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Active
Application number
EP16164657.5A
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German (de)
English (en)
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EP3231936A1 (fr
Inventor
Mika Viljanmaa
Jari Ilomäki
Timo Nurmiainen
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
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Valmet Technologies Oy
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Priority to EP16164657.5A priority Critical patent/EP3231936B1/fr
Priority to CN201710231865.2A priority patent/CN107287966A/zh
Publication of EP3231936A1 publication Critical patent/EP3231936A1/fr
Application granted granted Critical
Publication of EP3231936B1 publication Critical patent/EP3231936B1/fr
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/0073—Accessories for calenders
    • D21G1/0093—Web conditioning devices
    • 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
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/18—Drying webs by hot air
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus

Definitions

  • present invention relates to producing fiber webs in a fiber web production line, in particular to producing board webs. More especially the present invention relates to a method according to preamble part of claim 1.
  • a typical production and treatment line comprises a head box, a wire section and a press section as well as a subsequent drying section and a reel-up.
  • the production and treatment line can further comprise other devices and/or sections for finishing the fiber web, for example, a pre-calender, a sizer, a final-calender, a coating section.
  • the production and treatment line also typically comprises at least one slitter-winder for forming customer rolls as well as a roll packaging apparatus or a sheet cutter.
  • fiber webs are meant for example a paper and board webs.
  • thermal energy is provided to the fiber webs by contact, for example by drying cylinders; by convection, for example by impingement dryers; by condensation of steam on the surfaces of the fiber webs, for example by steam boxes; by radiation, for example by infrared dryers.
  • drying temperature of the fiber web increases and thus partial pressure of steam in the fiber web increases.
  • Difference of partial steam pressures in the fiber web and the ambient air seeks to even out, whereby the fiber web evaporates moisture and dries.
  • efficiency of the traditional drying in particularly when using drying cylinders) decreases, due to small temperature difference and small heat flow.
  • Calendering can be pre-calendering or intermediate calendering or final calendering depending on the type of the production line. Pre-calendering is typically used for creating required surface properties for further treatment for example for coating and final-calendering is generally carried out in order to improve the properties, like smoothness and gloss, of a web-like material such as a paper or board web.
  • a nip i.e. calendering nip, formed between rolls that are pressed against each other, in which nip the web becomes deformed as by the action of temperature, moisture and nip pressure.
  • the nips are formed between a smooth-surfaced press roll such as a metal roll and a roll coated with resilient material such as a polymer roll or between two smooth-surfaced rolls.
  • the resilient-surfaced roll adjusts itself to the forms of the web surface and presses the opposite side of the web evenly against the smooth-surfaced press roll.
  • the nips can be formed also by using instead one of roll a belt or a shoe as known from prior art.
  • calenders to be used as a pre-calender and/or an intermediate calender and/or as an final-calender are known, for example hard nip calenders, soft nip calenders, supercalenders, metal belt calenders, shoe calenders, long nip calenders, multinip calenders etc.
  • Paper and board are available in a wide variety of types and can be divided according to basis weight in two grades: papers with a single ply and a basis weight of 25 - 300 g/m 2 and boards manufactured in multi-ply technology and having a basis weight of 150 - 600 g/m 2 . It should be noted that the borderline between paper and board is flexible since board grades with lightest basis weights are lighter than the heaviest paper grades. Generally speaking, paper is used for printing and board for packaging.
  • Mechanical-pulp based, i.e. wood-containing printing papers include newsprint, uncoated magazine and coated magazine paper.
  • DIP deinked pulp
  • TMP mechanical pulp
  • DIP based newsprint may contain up to 20 % filler.
  • the filler content of a virgin-fiber based newsprint furnish is about 8 %.
  • Uncoated magazine paper (SC-supercalendered) grades usually contain 50 - 75 % mechanical pulp, 5 - 25 % chemical pulp, and 10 - 35 % filler.
  • the paper may also contain DIP.
  • Typical values for calendered SC paper containing e.g.
  • SC-C, SC-B, and 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) 1.0 - 2.5 ⁇ m, density 700 - 1250 kg/m 3 , brightness (ISO 2470:1999) 62 - 75 %, and opacity (ISO 2470:1998) 90 - 95 %.
  • Coated mechanical papers include for example MFC (machine finished coated), LWC (light weight coated), MWC (medium weight coated), and HWC (heavy weight coated) grades.
  • Coated mechanical papers usually contain 45 -75 % mechanical or recycled fiber and 25 - 55 % chemical pulp. Semichemical pulps are typical in LWC paper grades made in the Far East. The filler content is about 5 -10 %. The grammage is typically in the range 40 - 80 g/m 2 .
  • LWC paper can be regarded as follows: basis weight 40 - 70 g/m 2 , Hunter gloss 50 - 65 %, PPS S10 roughness 1.0 - 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
  • basis weight 48 - 70 g/m 2 Hunter gloss 25 - 40 %
  • PPS S10 roughness 2.2 - 2.8 ⁇ m PPS S10 roughness 2.2 - 2.8 ⁇ m
  • density 900 - 950 kg/m 3 brightness 70 - 75 %
  • opacity 91 - 95 % opacity 91 - 95 %.
  • MWC paper medium weight coated
  • basis weight 70 - 90 g/m 2 Basis weight 70 - 90 g/m 2
  • Hunter gloss 65 - 70 % PPS S10 roughness 0.6 - 1.0 ⁇ m
  • density 1150 - 1250 kg/m 3 brightness 70 - 75 %
  • opacity 89 - 94 % opacity 89 - 94 %.
  • Woodfree paper is divided into two segments: uncoated and coated. Conventionally, the furnish of woodfree papers consists of bleached chemical pulp, with less than 10 % mechanical pulp.
  • Typical values are for uncoated WFU Copy paper: grammage 70 - 80 g/m 2 , Bendtsen roughness 150 - 250 ml/min and bulk > 1.3 cm 3 /g; for uncoated offset paper: grammage 60 - 240 g/m 2 , Bendtsen roughness 100 - 200 ml/min and bulk 1.2 - 1.3 cm 3 /g; and for color copy paper: grammage 100 g/m 2 , Bendtsen roughness ⁇ 50 ml/min and bulk 1.1 cm 3 /g.
  • WFC coated pulp-based printing papers
  • the amounts of coating vary widely in accordance with requirements and intended application.
  • Containerboard includes both linerboard and corrugating medium. Liners are divided according to their furnish base into kraftliner, recycled liner and white top liner. Liners are typically 1- to 3-ply boards with grammages varying in the range 100 - 300 g/m 2 .
  • Linerboards are generally uncoated, but the production of coated white-top liner is increasing to meet higher demands for printability.
  • the main cartonboard grades are folding boxboard (FBB), white-lined chipboard (WLC), solid bleached board (SBS) and liquid packaging board (LPB). In general, these grades are typically used for different kinds of packaging of consumer goods.
  • Carton board grades vary from one- up to five-ply boards (150-400 g/m 2 ). The top side is usually coated with from one to three layers (20-40 g/m 2 ), the back side has less coating or no coating at all. There is a wide range of different quality data for the same board grade.
  • FBB has the highest bulk thanks to the mechanical or chemimechanical pulp used in the middle layer of the base board.
  • the middle layer of WLC consists mainly of recycled fiber, whereas SBS is made from chemical pulp, exclusively.
  • FBB's bulk typically is between 1.1 - 1.9 cm 3 /g whereas WLC is on range 1.1 - 1.6 cm 3 /g and SBS 0.95 - 1.3 cm 3 /g.
  • the PPS-s10-smoothess is respectively for FBB between 0.8 - 2.1 ⁇ m, for WLC 1.3 - 4.5 ⁇ m and for SBS 0.7 - 2.1 ⁇ m.
  • Release paper is used in label base paper in various end-use applications, such as food packaging and office labels.
  • the most common release paper in Europe is supercalendered glassine paper coated with silicone to provide good release properties.
  • Typical values for supercalendered release papers are basis weight 60 - 95 g/m 2 , caliper 55 - 79 ⁇ m, IGT 12 - 15 cm, Cobb Unger for dense side 0.9 - 1.6 g/m 2 and for open side 1.2 - 2.5 g/m 2 .
  • Coated label paper is used as face paper for release, but also for coated backing paper and flexible packings.
  • Coated label paper has a grammage of 60 - 120 g/m 2 and is typically sized or precoated with a sizer and single-blade coated on one side.
  • Some typical paper properties for coated and calendered label paper are basis weight 50 - 100 g/m 2 , Hunter gloss 70 - 85 %, PPS s10 roughness 0.6 - 1.0 ⁇ m, Bekk smoothness 1500 - 2000 s and caliper 45 - 90 ⁇ m.
  • the fiber web is guided from the drying section to a precalender, when the temperature of the fiber web is about 80 - 90 °C.
  • the middle layers of the web are hot and near plastic state, whereby during calendering the fiber web will compact also in the middle layers, which leads to bulk loss.
  • Publication EP 2682520 A1 discloses a production line for producing fiber webs, which comprises at least one calender with at least one calendering nip and a reel-up after the calender and at least one cooling means before the at least one calender for cooling the fiber web to temperatures of not higher than 40 °C, preferably to temperature in the range of 10 - 30 °C
  • Publication WO 2005/042837 A1 discloses a treatment line for paper in which on the travel path of a paper web that is arranged to convey forward the paper web moving at web speed, there is a moistening device, a calender for precalendering the surface of the paper web and a coating unit for coating the paper web precalendered in the calender and the travel path of the paper web between the moistening device and the calender is arranged to have such a length with respect to the web speed that the delay time of the web between the moistening device and a hot precalendering nip surface of the calender located on the same side with respect to said moistening device is 0.6 to 6.0 s.
  • Publication WO 00/70144 A1 discloses a paper machine line in particular for the manufacture of fine paper, which line comprises a short circulation, a headbox, a wire section, a press section, a dryer section, a precalender, a precoater and a drying section after that, a coating station/stations and after-drying section/sections, a calender and a reel-up, which may comprise a moistening device based on steam or water mist, placed before the calender, for profile control of curl.
  • Publication EP2876206 A1 discloses a method, in which fiber web is cooled at least partially by moisturizing and evaporative cooling process, advantageously by combination of applying moisture, for example water, and of blowing dry cool gas, for example air, onto the surface of the fiber web. The moisture evaporates and cools the fiber web.
  • An object of the invention is to create a production line which is simple, cost effective and raw material saving production line and a method of producing fiber webs with high production capacity.
  • a further object of the present invention is to approach the above problems from a new point of view and to suggest novel solutions contrary to conventional modes of thinking.
  • One further object of the present invention is to provide an energy efficient drying to the production line of a fiber web and to the method of producing a fiber web. To achieve the objects mentioned above and later the method according to the invention is defined by the features of claim 1.
  • thermal energy of the fiber web is utilized such that difference of partial steam pressures of the fiber web and the ambient air is created by providing dry gas, for example air or air-mixture or gas-mixture, blows on at least one surface of the fiber web.
  • the fiber web after drying with dry gas blows the fiber web is further dried by traditional drying methods, for example by drying cylinders. This is advantageous as the fiber web is again cool and thus the temperature difference and the heat flow have increased.
  • relative humidity of the dry gas blows is at the most 70 %.
  • cycle of drying with dry gas blows and drying with traditional drying methods is repeated at least once.
  • the fiber web is dried by cool, dry gas after the drying section before a calender.
  • waste heat of the fiber web will be utilized and thus energy savings are achieved and additionally the calendering is improved, especially the bulkiness / roughness relation is improved 2 - 6 % as the fiber web entering the calender is cool and as the cooler fiber web endures more pressure.
  • temperature of the cool, dry gas blows is lower than temperature of the fiber web.
  • the fiber web is dried with cool, dry gas at least before calendering and/or at least before reeling.
  • a 7 - 20 m, advantageously 10 - 15 meters long run of the fiber web is before the calendering or reeling, advantageously without processing or treating the fiber web or provided with drying with cool, dry gas.
  • a 7 - 20 m, advantageously 10 - 15 meters long run of the fiber web is before the calendering and reeling, advantageously without processing or treating the fiber web or provided with drying with cool, dry gas. The distance is calculated from the point where the fiber web leaves the last means processing or treating the fiber web i.e. the previous drying or cooling cylinder before the calender, to the point where the fiber web contacts the first roll of the calender or contacts the reeling cylinder.
  • Temperature of the dry, cool gas blows is advantageously 10 - 60 °C.
  • drying without using extra energy supply is achieved.
  • the free surfaces of the fiber web are cooled, whereby the partial pressure of steam on the surfaces decreases and in middle of the fiber web the partial pressure of steam remains high.
  • the difference in partial steam pressures conveys the moisture by diffusion from middle of the fiber web to the surfaces of the fiber web and drying is enhanced.
  • the fiber web is cooled by the long run or by the long run provided with cool, dry gas blows is located before a pre-calender.
  • the fiber web that comprises starch is cooled before calendering by the long run or by the long run provided with cool, dry gas blows and the fiber web is calendered in a calendering nip comprising a thermo roll, temperature of which is at the most 150 °C, advantageously at the most 100 °C.
  • the production line advantageously comprises at least one head box, which can be a two or three layer head box, forming means for each layer or layer combination, a press section with at least one press nip, a drying section, at least one calender.
  • the production line further comprises a Yankee cylinder and/or belt arrangement, a size press and an after drying section located after the Yankee cylinder and/or belt arrangement and/or the size press and/or the calender.
  • the production line further comprises a coating section for coating the fiber web by 1 - 6 layers of coating and drying means for drying the coating.
  • the production speed of the production line is advantageously 100 - 2000 m/min.
  • the basis weight of the fiber web produced by the production line is 50 - 1000 g/m 2 .
  • the end product of the production line is a fiber web with 1 - 10 fiber layers.
  • the end product of the production line is a fiber web with 1-10 coating layers.
  • the head box is a two or a three layer head box.
  • the press section comprises at least one roll press nip and/or at least one shoe press nip.
  • the drying section comprises at least one drying cylinder group with one wire draw and/or at least one drying cylinder group with twin wire draw.
  • the calender is a pre- or an intermediate or an end calender.
  • the size press is a bond sizer or a spray sizer or a film sizer.
  • the after coating section comprises at least one of the following: a bond coater, an air brush coater, a sizer, a blade coater, a rod coater, a curtain coater, a spray coater, a cast coater.
  • the production line for producing fiber webs comprises three head boxes 7, 8, 9 each for providing furnish for one fiber layer of the fiber web W and each followed by a forming unit 101, 102, 103 in a forming section 10 of the production line, in which forming section the fiber web W is formed and moisture is removed from the fiber web.
  • a press section 11 the fiber web W is pressed in press nips 111, 112.
  • a drying section 12 of the production line comprises traditional drying in drying cylinder group/-s 121 of one-wire draw and/or in drying cylinder group/-s 122, 12N of twin-wire draw.
  • the drying section 12 is followed by a size press 131 of a sizing section 13, which comprises a drying section 14 for the size, which drying section comprises a turning device 141, non-contact drying means 142, drying cylinder group 143 with twin-wire draw.
  • a cooler 144 After the drying section 14 for the size is provided a cooler 144. After the cooler 144 the fiber web is calendered in a calendering nip formed between two calender rolls in a calender 15 followed by drying by non-contact drying means 152. There after the fiber web W is coated in coating section 16, 17, which provides coating for two coating layers by coaters 161, 171.
  • Each coater 161, 171 is followed by a drying section comprising non-contact drying means 162, 172 and/or a drying cylinder group 163, 173.
  • an end calender 18 is located, in which the fiber web W is calendered in two calendering nips 181, 182 formed between calender rolls.
  • the fiber web W is reeled to a parent roll 192 having full width fiber web in a reel-up 19 by a reeling cylinder 191.
  • the parent rolls 192 are transferred to an unwinder 201 of the slitter-winder 20.
  • the unwound full width fiber web W is cut in longitudinal direction of the fiber web W i.e. slitted in a slitter 202 to partial fiber webs WN by slitter blades and the partial fiber webs WN are wound to partial fiber web rolls i.e. customer rolls in a winder 203.
  • the head box is a two or a three layer head box 7, 8, 9, the press section comprises at least one roll press nip 111 and/or at least one shoe press nip 112, the drying section comprises at least one drying cylinder group 121 with one wire draw and/or at least one drying cylinder group 122, 12N with twin wire draw and the size press 131 is a bond sizer or a spray sizer or a film sizer.
  • the production line comprises at least one cooler 144 providing gas blows after the press section, at least one moisturizing device located before at least one cooler 144, at least one calender 15, a reel-up 19, a slitter-winder 20 and/or a sheet cutter.
  • the cooler 144 comprises means to blow dry, cool gas towards at least one surface of the fiber web W.
  • calenders 15 can be used as a pre-calender and/or as an intermediate and/or as an final-calender, for example hard nip calenders, soft nip calenders, supercalenders, metal belt calenders, shoe calenders, long nip calenders, multinip calenders.
  • the production line can further comprise a Yankee cylinder and/or belt arrangement, a size press 131 and an after drying section 14, 152 located after the Yankee cylinder and/or belt arrangement and/or the size press and/or the calender 15 and a coating section 16, 17 for coating the fiber web by 1 - 4 layers of coating and drying means for drying the coating.
  • the coating section 16, 17 comprises at least one coater 161, 171 of the following: a bond coater, an air brush coater, a sizer, a blade coater, a rod coater, a curtain coater, a spray coater, a cast coater.
  • a non-contacting means for cooling the fiber web i.e. the cooler 144 providing cool gas is located and length of the fiber web run between last contact point of the fiber web on the last drying or cooling cylinder before the calender 15 and the first contact point of the fiber web on the first calender roll forming calendering nip of the calender 15 it is 7 - 20 m, advantageously 10 - 15 m.

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Claims (6)

  1. Procédé de production d'une bande de matériau fibreux (W), dans lequel procédé de la matière est apportée depuis au moins une caisse de tête (7, 8, 9) vers au moins une section de formage (10) pour former la matière en une bande de matériau fibreux, la bande de matériau fibreux étant comprimée dans une section de presse (11), la bande de matériau fibreux étant séchée dans au moins une section de séchage (12), la bande de matériau fibreux étant calandrée dans au moins une calandre (15, 18) et enroulée en un rouleau (19), dans lequel procédé, lors du séchage d'une bande de matériau fibreux (W), de l'énergie thermique de la bande de matériau fibreux (W) est utilisée de manière à ce qu'une différence entre des pressions de vapeur partielles de la bande de matériau fibreux (W) et l'air ambiant soit créée en fournissant des souffles de gaz sec ayant une humidité relative d'au plus 70 % sur au moins une surface de la bande de matériau fibreux, l'énergie thermique de la bande de matériau fibreux étant utilisée pour l'évaporation d'humidité de la bande de matériau fibreux et la bande de matériau fibreux se déplaçant de 7 à 20 m, avantageusement 10 à 15 m, avant le calandrage ou l'enroulement.
  2. Procédé selon la revendication 1, dans lequel la bande de matériau fibreux se déplace de 7 à 20 m, avantageusement de 10 à 15 m, avant le calandrage et l'enroulement.
  3. Procédé selon la revendication 2, dans lequel, dans ledit déplacement avant le calandrage et/ou l'enroulement, la bande de matériau fibreux (W) est séchée avec les souffles de gaz sec et frais et la température des souffles de gaz sec et frais est de 10 à 60 °C.
  4. Procédé selon la revendication 3, dans lequel, après le séchage avec les souffles de gaz sec et frais, la bande de matériau fibreux (W) est en outre séchée par des cylindres de séchage.
  5. Procédé selon la revendication 4, dans lequel le séchage avec les souffles de gaz sec et le séchage avec des cylindres de séchage sont répétés au moins une fois.
  6. Procédé selon l'une quelconque des revendications précédentes 2 à 5, dans lequel la bande de matériau fibreux (W) qui comprend de l'amidon est refroidie avant le calandrage par le déplacement ou par le déplacement réalisé avec les souffles de gaz sec et frais et la bande de matériau fibreux est calandrée dans un interstice de calandrage comprenant un rouleau thermique dont la température est au plus de 150 °C, avantageusement au plus de 100 °C.
EP16164657.5A 2016-04-11 2016-04-11 Procédé de production de bandes de materiau fibreux Active EP3231936B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP16164657.5A EP3231936B1 (fr) 2016-04-11 2016-04-11 Procédé de production de bandes de materiau fibreux
CN201710231865.2A CN107287966A (zh) 2016-04-11 2017-04-11 生产纤维幅材的方法和生产纤维幅材的生产线

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16164657.5A EP3231936B1 (fr) 2016-04-11 2016-04-11 Procédé de production de bandes de materiau fibreux

Publications (2)

Publication Number Publication Date
EP3231936A1 EP3231936A1 (fr) 2017-10-18
EP3231936B1 true EP3231936B1 (fr) 2023-10-11

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI3540119T3 (fi) * 2018-03-15 2023-09-21 Valmet Technologies Oy Kuiturainakone ja menetelmä monikerroksisen rainan muodostamiseksi
FI131085B1 (en) * 2022-02-17 2024-09-17 Valmet Tech Oy Method and system for the production of fiber webs

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI991096A (fi) * 1999-05-12 2000-11-13 Valmet Corp Menetelmä paperin, erityisesti hienopaperin, valmistamiseksi ja paperi konelinja erityisesti hienopaperin valmistamista varten
FI116980B (fi) * 2003-11-03 2006-04-28 Metso Paper Inc Esikalanterointimenetelmä ja paperin käsittelylinja
EP2682520B1 (fr) * 2012-07-03 2016-06-22 Valmet Technologies, Inc. Procédé de production d'une bande fibreuse et ligne de production d'une bande fibreuse
EP2876206B2 (fr) * 2013-11-21 2023-03-01 Valmet Technologies, Inc. Procédé de produktion de bandes de fibres et ligne de fabrication de bandes de fibres

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CN107287966A (zh) 2017-10-24
EP3231936A1 (fr) 2017-10-18

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