EP1759056B1 - Method for treating a fibrous web downstream of slitting - Google Patents

Method for treating a fibrous web downstream of slitting Download PDF

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Publication number
EP1759056B1
EP1759056B1 EP05744423A EP05744423A EP1759056B1 EP 1759056 B1 EP1759056 B1 EP 1759056B1 EP 05744423 A EP05744423 A EP 05744423A EP 05744423 A EP05744423 A EP 05744423A EP 1759056 B1 EP1759056 B1 EP 1759056B1
Authority
EP
European Patent Office
Prior art keywords
metal belt
fibrous web
treating
web
slitting
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.)
Not-in-force
Application number
EP05744423A
Other languages
German (de)
French (fr)
Other versions
EP1759056A1 (en
Inventor
Reijo PIETIKÄINEN
Eero Suomi
Pekka Taskinen
Mika Viljanmaa
Henri Vaittinen
Risto Talja
Vilho Nissinen
Jorma Laapotti
Jari Ilomäki
Maria Lepola
Juha Lipponen
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
Publication of EP1759056A1 publication Critical patent/EP1759056A1/en
Application granted granted Critical
Publication of EP1759056B1 publication Critical patent/EP1759056B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/0066—Calenders; Smoothing apparatus using a special calendering belt
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • 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 present invention relates to a method for treating a fibrous web downstream of slitting, said treatment comprising e.g. calendering, coating or various combinations thereof.
  • FI-B-81158 discloses a method for treating a fibrous web downstream of slitting and prior to pointing.
  • the borderline between paper and board is floating, the boards with lowest basis weight being lighter than the heaviest papers.
  • Mechanical pulp based or wood containing printing papers include newsprint, uncoated magazine and coated magazine paper.
  • Newsprint consists either entirely of mechanical pulp or may contain a small amount of bleached softwood pulp (0-15%), and/or recycled pulp can be used for replacing some of the mechanical pulp.
  • the following values can probably be considered common for newsprint: 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-P21:67) 100-200 ml/min, density 600-750 kg/ m 3 , brightness (ISO 2470:1999) 57-63%, and opacity (ISO 2470:1998) 90-96%.
  • Uncoated magazine paper generally comprises mechanical pulp at 50-70%, bleached softwood pulp at 10-25%, and fillers at 15-30%.
  • Typical values for calendered SC paper are basis weight of 40-60 g/ m 2 , ash content (SCAN-P5:63) of 0-35%, Hunter gloss (ISO/DIS 8254/1) of ⁇ 20-50%, PPS s1 0 roughness (SCAN-P 76:95) of 1.0-2.5 ⁇ m, density of 700-1250 kg/m 3 , brightness (ISO 2470:1999) of 62-70%, and opacity (ISO 2470:1998) of 90-95%.
  • Table 1 presents typical values for mechanical pulp containing, coatable papers.
  • HWC can be coated even more than twice.
  • Woodfree printing papers made of chemical pulp or fine grade papers include uncoated - and coated - chemical pulp based printing papers, in which the fraction of mechanical pulp is less than 10%.
  • Uncoated printing papers based on chemical pulp contain bleached birchwood pulp at 55-80%, bleached softwood pulp at 0-30%, and fillers at 10-30%.
  • WFU shows wide fluctuation of values: basis weight 50-90 g/ m 2 (even up to 240 g/ m 2 ), Bendtsen roughness 250-400 ml/min, brightness 86-92%, and opacity 83-98%.
  • Coated printing papers based on chemical pulp have coatings fluctuate over a wide range according to requirements and application.
  • Board making is performed by using chemical pulp, mechanical pulp and/or recycled pulp. Board grades can be divided e.g. in the following main groups according to applications intended therefor.
  • Corrugated board including a liner and a fluting.
  • FBB folding boxboard
  • LPB liquid packaging board
  • WLC white-lined chipboard
  • SBS solid bleached sulfite
  • SUS solid unbleached sulfite).
  • a metal belt calender which allows for the use of a very extensive pressure range and application time (heat transfer time and/or treating time) in a treatment zone, one and the same apparatus being applicable for the treatment of numerous different coated and uncoated printing papers and boards, has been described in more detail e.g. in earlier applications PCT/Fl03/00066 , PCT/Fl03/00067 and PCT/Fl03/00068 of the applicant for present application, and thus it is not described further at this time.
  • the length of a treatment zone is determined by means of the disposition of belt guiding elements and/or the design and/or disposition of counter-elements, and the contact pressure applied to a web within the treatment zone can be made adjustable for example within the range of about 0.01 MPa to about 200 MPa.
  • the size of a metal belt calender can be made smaller when using it the treatment of rolled-up narrow fibrous webs adapted to the width of a printing press or some other further processing machine.
  • the use of a metal belt calender enables a rapid change of treatment conditions, allowing e.g. for the manufacture of paper and board grades for different applications on the basis of one and the same stock, said stock possibly consisting of a coated or uncoated web of paper or board.
  • a switch between grades can be implemented readily and quickly, enabling the manufacture of even small batches in a cost effective fashion. I n addition, the stock purchase costs of a printing house will be reduced.
  • metal belt calendering stabilizes the structure of a fibrous web, enabling the minimization of bubbling in a printing press resulting from the use of a water-soluble printing ink.
  • a method of the invention can also be accompanied by a relatively light treatment of the printed fibrous web with a metal belt calender downstream of the printing press, if such treatment is beneficial for polishing the print.
  • association with a metal belt calender can also be provided elements for coating a fibrous web, such as for example a dry coating apparatus or a separate coater, upstream or downstream of the metal belt calender.
  • elements for coating a fibrous web such as for example a dry coating apparatus or a separate coater, upstream or downstream of the metal belt calender.
  • a printing press can be provided not only metal belt calenders but also other types of calenders for enabling a versatile treatment of the fibrous web prior to passing it to the printing press.
  • a metal belt calender can also be used for drying a fibrous web, thus enabling the use of a higher rolling-up moisture on the papermaking line.

Landscapes

  • Paper (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Surgical Instruments (AREA)

Abstract

The invention relates to a method for treating a fibrous web downstream of slitting. In the method, the finishing of a fibrous web for providing desired properties is performed by using one or more finishing units, at least one of which comprises a web processing apparatus provided with a metal belt.

Description

  • The present invention relates to a method for treating a fibrous web downstream of slitting, said treatment comprising e.g. calendering, coating or various combinations thereof.
  • FI-B-81158 discloses a method for treating a fibrous web downstream of slitting and prior to pointing. A wide variety of paper and board grades exist and can be divided according to basis weight in two classes: papers of a single ply with a basis weight of 25-300 g/m2 and boards produced by multilayer technique with a basis weight of 150-600 g/ m2. As noted, the borderline between paper and board is floating, the boards with lowest basis weight being lighter than the heaviest papers.
  • The following representative descriptions are examples of currently employed values for fibrous webs and substantial deviations from such values are possible. The main source for descriptions is the publication Papermaking Science and Technology, section Papermaking Part 3, finishing, edit. Jokio M., publ. Fapet Oy, Jyväskylä 1999, page 361.
  • Mechanical pulp based or wood containing printing papers include newsprint, uncoated magazine and coated magazine paper.
  • Newsprint consists either entirely of mechanical pulp or may contain a small amount of bleached softwood pulp (0-15%), and/or recycled pulp can be used for replacing some of the mechanical pulp. The following values can probably be considered common for newsprint: basis weight 40-48.8 g/ m2, ash content (SCAN-P 5:63) 0-20%, PPS s10 roughness (SCAN-P 76-95) 3.0-4.5 µm, Bendtsen roughness (SCAN-P21:67) 100-200 ml/min, density 600-750 kg/ m3, brightness (ISO 2470:1999) 57-63%, and opacity (ISO 2470:1998) 90-96%.
  • Uncoated magazine paper (SC = supercalendered) generally comprises mechanical pulp at 50-70%, bleached softwood pulp at 10-25%, and fillers at 15-30%. Typical values for calendered SC paper (including, among others, SC-C, SC-B and SC-A/A+) are basis weight of 40-60 g/ m2, ash content (SCAN-P5:63) of 0-35%, Hunter gloss (ISO/DIS 8254/1) of <20-50%, PPS s1 0 roughness (SCAN-P 76:95) of 1.0-2.5 µm, density of 700-1250 kg/m3, brightness (ISO 2470:1999) of 62-70%, and opacity (ISO 2470:1998) of 90-95%.
  • Table 1 presents typical values for mechanical pulp containing, coatable papers. (MFC = machine finished coated, FOO = film coated offset, LWC = light weight coated, MWC = medium weight coated, HWC = heavy weight coated). Table 1
    MFC FOO LWC MWC HWC
    basis weight (g/ m2) 50-70 40-70 40-70 70-90 100-135
    Hunter gloss (ISO/DIS 8254/1), (%) 25-40 45-55 50-65 65-70
    PPS-s10 roughness, (µm) (SCAN-P 76/95) 2.2-2.8 1.5-2.0 0.8-1.5 (offset) 0.6-1.0 (roto) 0.6-1.0
    density, (kg/ m3) 900-950 1000-1050 1100-1250 1150-1250
    brightness (ISO 2470:1999), (%) 70-75 70-75 70-75 70-75
    opacity (ISO 2470:1998), (%) 91-95 91-95 89-94 89-94
  • Coated magazine paper (LWC = light weight coated) contains mechanical pulp at 40-60%, bleached softwood pulp at 25-40%, and fillers and coating agents at 20-35%.
  • HWC can be coated even more than twice.
  • Woodfree printing papers made of chemical pulp or fine grade papers include uncoated - and coated - chemical pulp based printing papers, in which the fraction of mechanical pulp is less than 10%.
  • Uncoated printing papers based on chemical pulp (WFU) contain bleached birchwood pulp at 55-80%, bleached softwood pulp at 0-30%, and fillers at 10-30%. WFU shows wide fluctuation of values: basis weight 50-90 g/ m2 (even up to 240 g/ m2), Bendtsen roughness 250-400 ml/min, brightness 86-92%, and opacity 83-98%.
  • Coated printing papers based on chemical pulp (WFC) have coatings fluctuate over a wide range according to requirements and application. The following are typical values for once and twice coated printing paper based on chemical pulp: once coated basis weight 90 g/ m2, Hunter gloss 65-80%, PPS s10 roughness 0.75-2.2 µm, brightness 80-88%, and opacity 91-94%, and twice coated basis weight 130 g/ m2, Hunter gloss 70-80%, PPS s10 roughness 0.65-0.95 µm, brightness 83-90%, and opacity 95-97%.
  • Other papers include, among others, sackkraft, tissue, and wallpaper.
  • Board making is performed by using chemical pulp, mechanical pulp and/or recycled pulp. Board grades can be divided e.g. in the following main groups according to applications intended therefor.
  • Corrugated board including a liner and a fluting.
  • Boxboards used for making boxes, containers. Boxboards include, among others, liquid packaging boards (FBB = folding boxboard, LPB = liquid packaging board, WLC = white-lined chipboard, SBS = solid bleached sulfite, SUS = solid unbleached sulfite).
  • Graphic boards used for making e.g. cards, folders, files, cases, covers, etc.
  • As indicated by the foregoing, there is a huge variety of paper and board grades and machines of several different types are used for making the same.
  • It is an objective of the present invention to provide a method and apparatus for treating coated and uncoated papers and boards in an optimal manner in a process following the actual manufacturing line downstream of slitting, the webs to be treated being narrow, e.g. 0,15-4,5 m, the size of finishing machines being thus designed respectively to be substantially smaller than the processing equipment normally present in the manufacturing line.
  • In order to accomplish the objectives of the invention, a method of the invention is characterized by what is set forth in claim 1.
  • A metal belt calender, which allows for the use of a very extensive pressure range and application time (heat transfer time and/or treating time) in a treatment zone, one and the same apparatus being applicable for the treatment of numerous different coated and uncoated printing papers and boards, has been described in more detail e.g. in earlier applications PCT/Fl03/00066 , PCT/Fl03/00067 and PCT/Fl03/00068 of the applicant for present application, and thus it is not described further at this time. I n a metal belt calender, the length of a treatment zone is determined by means of the disposition of belt guiding elements and/or the design and/or disposition of counter-elements, and the contact pressure applied to a web within the treatment zone can be made adjustable for example within the range of about 0.01 MPa to about 200 MPa.
  • The size of a metal belt calender can be made smaller when using it the treatment of rolled-up narrow fibrous webs adapted to the width of a printing press or some other further processing machine. The use of a metal belt calender enables a rapid change of treatment conditions, allowing e.g. for the manufacture of paper and board grades for different applications on the basis of one and the same stock, said stock possibly consisting of a coated or uncoated web of paper or board. Hence, a switch between grades can be implemented readily and quickly, enabling the manufacture of even small batches in a cost effective fashion. I n addition, the stock purchase costs of a printing house will be reduced.
  • Furthermore, metal belt calendering stabilizes the structure of a fibrous web, enabling the minimization of bubbling in a printing press resulting from the use of a water-soluble printing ink.
  • A method of the invention can also be accompanied by a relatively light treatment of the printed fibrous web with a metal belt calender downstream of the printing press, if such treatment is beneficial for polishing the print.
  • In association with a metal belt calender can also be provided elements for coating a fibrous web, such as for example a dry coating apparatus or a separate coater, upstream or downstream of the metal belt calender. In association with a printing press can be provided not only metal belt calenders but also other types of calenders for enabling a versatile treatment of the fibrous web prior to passing it to the printing press.
  • A metal belt calender can also be used for drying a fibrous web, thus enabling the use of a higher rolling-up moisture on the papermaking line.

Claims (3)

  1. A method for treating a fibrous web downstream of slitting, wherein the fibrous web is subjected to a finishing treatment for providing the web with desiread properties, wherein the finishing treatment is performed by using one or more finishing units, at least one of which comprises a web processing apparatus provided with a metal belt, said metal-belt equipped web processing apparatus comprising a metal belt calender and/or a metal belt coater and/or a metal belt dryer and/or a dry coater, wherein the finishing treatment is performed at a printing site for providing the fibrous web with a desired finish prior to passing it to a printing press, and wherein said one or more finishing units are disposed on-line with respect to the printing press.
  2. A method as set forth in claim 1,
    characterized in that
    the method comprises using a common stock to produce various grades for various applications by varying the running conditions of a metal belt calender.
  3. A method as set forth in claim 1,
    characterized in that
    the method also comprises treating the fibrous web with a metal belt calender downstream of the printing press for polishing the print.
EP05744423A 2004-06-24 2005-05-31 Method for treating a fibrous web downstream of slitting Not-in-force EP1759056B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20045243A FI117444B (en) 2004-06-24 2004-06-24 A method for treating a fibrous web in a post-sectional step
PCT/FI2005/050184 WO2006000633A1 (en) 2004-06-24 2005-05-31 Method for treating a fibrous web downstream of slitting

Publications (2)

Publication Number Publication Date
EP1759056A1 EP1759056A1 (en) 2007-03-07
EP1759056B1 true EP1759056B1 (en) 2008-08-27

Family

ID=32524617

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05744423A Not-in-force EP1759056B1 (en) 2004-06-24 2005-05-31 Method for treating a fibrous web downstream of slitting

Country Status (7)

Country Link
US (1) US20080289784A1 (en)
EP (1) EP1759056B1 (en)
JP (1) JP4927724B2 (en)
AT (1) ATE406476T1 (en)
DE (1) DE602005009359D1 (en)
FI (1) FI117444B (en)
WO (1) WO2006000633A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3049252B1 (en) * 2013-09-25 2018-03-07 Koenig & Bauer AG Web-fed inkjet printing press, printing ink and method for printing a printing material
EP2876206B2 (en) * 2013-11-21 2023-03-01 Valmet Technologies, Inc. Method for producing fiber webs and production line for producing fiber webs
EP3731404A1 (en) 2019-04-25 2020-10-28 Black & Decker Inc. Sensorless variable conduction control for brushless motor

Family Cites Families (18)

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US2347047A (en) * 1940-08-31 1944-04-18 Interchem Corp Printing method and paper for use therein
US2997951A (en) * 1957-11-01 1961-08-29 William F Huck Wiping and polishing device for intaglio printing presses
US3684614A (en) * 1969-08-11 1972-08-15 Jerome H Lemelson Process for the manufacture of optical display devices
FR2525650A1 (en) * 1982-04-22 1983-10-28 Condat Papeteries METHOD AND DEVICE FOR MAKING PAPER OR CARDBOARD
US4898752A (en) * 1988-03-30 1990-02-06 Westvaco Corporation Method for making coated and printed packaging material on a printing press
DE4126233C1 (en) * 1991-08-08 1992-09-17 Sulzer-Escher Wyss Gmbh, 7980 Ravensburg, De
FI108061B (en) * 1995-10-05 2001-11-15 Metso Paper Inc Method for coating a paper or cardboard web
CA2188074C (en) * 1995-11-13 2000-12-05 Dieter Kurth Process for converting and printing on webs, and a printing machine for carrying out this process
CA2214486C (en) * 1996-09-04 2006-06-06 Consolidated Papers, Inc. Method and apparatus for minimizing web-fluting in heat-set, web-offset printing presses
FI102304B1 (en) * 1997-04-02 1998-11-13 Valmet Corp Calendaring process and calendar for application of the process
US6030496A (en) * 1997-04-16 2000-02-29 Kimberly-Clark Worldwide, Inc. Making a web
FI115730B (en) * 2000-05-03 2005-06-30 Metso Paper Inc Band calender and method for calendering a web of material in a band calender
US6740200B2 (en) * 2001-12-19 2004-05-25 Kimberly-Clark Worldwide, Inc. Methods and system for manufacturing and finishing web products at high speed without reeling and unwinding
US7704351B2 (en) * 2002-01-29 2010-04-27 Metso Paper, Inc. Processing device and method of operating the device for processing a coated or uncoated fibrous web
FI20020159A (en) * 2002-01-29 2003-07-30 Metso Paper Inc Surface shaping apparatus and method using the apparatus for finishing coated or uncoated fibrous web
CN1625629B (en) * 2002-01-29 2012-06-27 梅特索纸业有限公司 Processing device for processing a coated or uncoated fibrous
DE10303375A1 (en) * 2002-02-23 2003-09-04 Heidelberger Druckmasch Ag Sheet de-curler for smoothing sheets, includes smoothing notch which communicates with suction chamber such that smoothing notch is disposed for having sheets drawn over smoothing notch
FI116799B (en) * 2004-07-02 2006-02-28 Metso Paper Inc Method and apparatus for coating a substrate and printed article

Also Published As

Publication number Publication date
ATE406476T1 (en) 2008-09-15
FI117444B (en) 2006-10-13
JP4927724B2 (en) 2012-05-09
JP2008506043A (en) 2008-02-28
EP1759056A1 (en) 2007-03-07
DE602005009359D1 (en) 2008-10-09
WO2006000633A1 (en) 2006-01-05
FI20045243A0 (en) 2004-06-24
FI20045243A (en) 2005-12-25
US20080289784A1 (en) 2008-11-27

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