EP1759056A1 - Method for treating a fibrous web downstream of slitting - Google Patents

Method for treating a fibrous web downstream of slitting

Info

Publication number
EP1759056A1
EP1759056A1 EP05744423A EP05744423A EP1759056A1 EP 1759056 A1 EP1759056 A1 EP 1759056A1 EP 05744423 A EP05744423 A EP 05744423A EP 05744423 A EP05744423 A EP 05744423A EP 1759056 A1 EP1759056 A1 EP 1759056A1
Authority
EP
European Patent Office
Prior art keywords
fibrous web
metal belt
finishing
treating
printing press
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.)
Granted
Application number
EP05744423A
Other languages
German (de)
French (fr)
Other versions
EP1759056B1 (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
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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.
  • 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/m 2 and boards produced by multilayer technique with a basis weight of 150-600 g/ m 2 .
  • 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 sI O roughness (SCAN-P 76-95) 3.0-4.5 ⁇ m, Bendtsen roughness (SCAN- R21 :67) 100-200 ml/min, density 600-750 kg/ m 3 , brightness (ISO 2470: 1999) 57- 63%, and opacity (I SO 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-P 5:63) of 0-35%, Hunter gloss (I SO/ Dl S 8254/1 ) of ⁇ 20-50%, PPS sI O roughness (SCAN-P 76:95) of 1.0-2.5 ⁇ m, density of 700-1250 kg/m 3 , brightness (I SO 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
  • FCO film coated offset
  • LWC light weight coated
  • MWC medium weight coated
  • HWC heavy weight coated
  • 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 method of the invention is characterized by what is set forth in the characterizing clause of claim 1. I n the method, the treatment of a fibrous web for providing desired properties is performed e.g.
  • finishing units at least one of which is a metal-belt equipped web processing apparatus, e.g. a metal belt calender, a coater, a dryer, a dry coater or the like.
  • a metal-belt equipped web processing apparatus e.g. a metal belt calender, a coater, a dryer, a dry coater or the like.
  • 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/ Fl 03/00066, PCT/ Fl 03/ 00067 and PCT/ Fl 03/ 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.
  • I n 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.
  • I n 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.

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

Method for treating a fibrous web downstream of slitting
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.
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, Jyvaskyla 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 sI O roughness (SCAN-P 76-95) 3.0-4.5 μm, Bendtsen roughness (SCAN- R21 :67) 100-200 ml/min, density 600-750 kg/ m3 , brightness (ISO 2470: 1999) 57- 63%, and opacity (I SO 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-P 5:63) of 0-35%, Hunter gloss (I SO/ Dl S 8254/1 ) of <20-50%, PPS sI O roughness (SCAN-P 76:95) of 1.0-2.5 μm, density of 700-1250 kg/m3 , brightness (I SO 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, FCO = film coated offset, LWC = light weight coated, MWC = medium weight coated, HWC = heavy weight coated).
Table 1
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 sI O 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 sI O 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. I n order to accomplish the objectives of the invention, a method of the invention is characterized by what is set forth in the characterizing clause of claim 1. I n the method, the treatment of a fibrous web for providing desired properties is performed e.g. at a printing site, prior to passing the fibrous web to a printing press, by using one or more finishing units, at least one of which is a metal-belt equipped web processing apparatus, e.g. a metal belt calender, a coater, a dryer, a dry coater or the like.
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/ Fl 03/00066, PCT/ Fl 03/ 00067 and PCT/ Fl 03/ 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.
I n 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. I n 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

Claims
1. A method for treating a fibrous web downstream of slitting, characterized in that the finishing of a fibrous web for providing desired properties is performed in the method 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 used in the method comprising a metal belt calender and/or a metal belt coater and/or a metal belt dryer and/or a dry coater, and that the finishing is performed at a printing site for providing the fibrous web with a desired finish prior to passing it to a 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.
4. A method as set forth in any of claims 1 to 3, characterized in that said one or more finishing units are disposed on-line with respect to the printing press.
5. A method as set forth in any of claims 1 to 3, characterized in that said one or more finishing units are disposed off-line with respect to the printing press.
EP05744423A 2004-06-24 2005-05-31 Method for treating a fibrous web downstream of slitting Expired - Lifetime EP1759056B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20045243A FI117444B (en) 2004-06-24 2004-06-24 Method for treating fiber web in one step following longitudinal cutting
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 true EP1759056A1 (en) 2007-03-07
EP1759056B1 EP1759056B1 (en) 2008-08-27

Family

ID=32524617

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05744423A Expired - Lifetime 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)

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Publication number Priority date Publication date Assignee Title
CN105579239B (en) * 2013-09-25 2017-08-25 柯尼格及包尔公开股份有限公司 Roll web ink-jet printer and the method for printing printable fabric
EP2876206B2 (en) * 2013-11-21 2023-03-01 Valmet Technologies, Inc. Method for producing fiber webs and production line for producing fiber webs
US11303235B2 (en) 2019-04-25 2022-04-12 Black & Decker Inc. Dual-controller system for a sensorless brushless motor control

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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
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EP2050869B1 (en) * 2002-01-29 2014-12-31 Valmet Technologies, Inc. Safety paper
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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
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Also Published As

Publication number Publication date
ATE406476T1 (en) 2008-09-15
JP2008506043A (en) 2008-02-28
WO2006000633A1 (en) 2006-01-05
JP4927724B2 (en) 2012-05-09
FI20045243A0 (en) 2004-06-24
FI20045243L (en) 2005-12-25
FI117444B (en) 2006-10-13
US20080289784A1 (en) 2008-11-27
DE602005009359D1 (en) 2008-10-09
EP1759056B1 (en) 2008-08-27

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