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WO2003050352A1 - Method for finishing board - Google Patents

Method for finishing board Download PDF

Info

Publication number
WO2003050352A1
WO2003050352A1 PCT/FI2002/000908 FI0200908W WO03050352A1 WO 2003050352 A1 WO2003050352 A1 WO 2003050352A1 FI 0200908 W FI0200908 W FI 0200908W WO 03050352 A1 WO03050352 A1 WO 03050352A1
Authority
WO
WIPO (PCT)
Prior art keywords
coating
web
calender
board
finishing
Prior art date
Application number
PCT/FI2002/000908
Other languages
French (fr)
Inventor
Matti Lares
Stefan Kuni
Original Assignee
Metso Paper, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Metso Paper, Inc. filed Critical Metso Paper, Inc.
Priority to AU2002338999A priority Critical patent/AU2002338999A1/en
Priority to DE10297514T priority patent/DE10297514T5/en
Publication of WO2003050352A1 publication Critical patent/WO2003050352A1/en

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/70—Multistep processes; Apparatus for adding one or several substances in portions or in various ways to the paper, not covered by another single group of this main group
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • 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
    • D21H23/30—Pretreatment of the paper

Definitions

  • Recycled board consists totally or partially of recycled fibers and is used e.g. for packages of dry foods, as well as packages for other than foodstuffs.
  • WLC board is typically a quadruple or four-layer system, comprising, for example, a base layer (recycled pulp), a filler layer (recycled pulp), a chemical pulp layer, and a coating. Manufacturing amounts of WLC increase all the time, focusing primarily on Asia. While the quality of raw material deteriorates, the quality requirements for a finished product keep increasing and, thus, for example the coating process is commonly performed three times for a sufficient coverage. According to state of the art, the best grade WLC is obtained by pretreating the board surface prior to a coating process with a Yankee cylinder and a profiling machine calender.
  • a method of the invention comprises first subjecting a board web to machine calendering, followed by subjecting the web to a pre-coating process, then by running the web through a long-nip calender and further to an actual coating station/stations for applying one or more coating layers to the web surface, and finally subjecting the web to calender finishing. Downstream of the actual coating station, upstream of calender finishing, the web can be further subjected to additional coating by blade coating for improving the web even further in terms of its smoothness and gloss.
  • Fig. 1 shows schematically the composition of a typical WLC board
  • Fig. 2 shows schematically one arrangement for implementing a method of the invention.
  • Fig. 1 depicts schematically a multi-layer structure for one WLC board, which in the illustrated embodiment comprises a base layer 1 of recycled pulp, a filler layer 2, likewise of recycled pulp, a pulp layer 3, and a coating 4 which may consist of several coating layers.
  • the exemplary embodiment of fig. 2 depicts one finishing method of the invention, wherein a board web W is first passed through a machine calender 10 for profiling its thickness. This is followed by passing the web to a blade coating station 11 for pre-coating in order to improve the web smoothness. Then the web is driven through a long-nip calender, for example a shoe calender 12, as shown in fig. 2, or a belt calender, for improving the topography of web surface. The long-nip calender is followed by passing the web to an actual coating station, which can be for example a spray coating station 13, a curtain coating station, or an Opticoat Duo coating station.
  • an actual coating station which can be for example a spray coating station 13, a curtain coating station, or an Opticoat Duo coating station.
  • the web surface is provided with one or more coating layers for achieving a desired coverage.
  • the web is still subjected to calender finishing, for example with a soft calender 14 or a multi-roll calender for improving the web smoothness and gloss.
  • calender finishing for example with a soft calender 14 or a multi-roll calender for improving the web smoothness and gloss.
  • a blade coating for still improving the web smoothness and gloss.

Landscapes

  • Paper (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

The invention relates to a method for finishing board, especially recycled board (WLC). In the method, a board web (W) is first subjected to machine calendering (10). Next, the web is subjected to pre-coating (11). Then the web is driven through a long-nip calender (12) and further to an actual coating station/stations (13) for applying one or more coating layers to the web surface. Finally, the web is subjected to calender finishing (14).

Description

Method for finishing board
The present invention relates to a method for finishing board, especially recycled board (WLC = white line chip board).
Recycled board consists totally or partially of recycled fibers and is used e.g. for packages of dry foods, as well as packages for other than foodstuffs. WLC board is typically a quadruple or four-layer system, comprising, for example, a base layer (recycled pulp), a filler layer (recycled pulp), a chemical pulp layer, and a coating. Manufacturing amounts of WLC increase all the time, focusing primarily on Asia. While the quality of raw material deteriorates, the quality requirements for a finished product keep increasing and, thus, for example the coating process is commonly performed three times for a sufficient coverage. According to state of the art, the best grade WLC is obtained by pretreating the board surface prior to a coating process with a Yankee cylinder and a profiling machine calender.
It is an object of the present invention to provide an improved finishing method for producing grades of board, especially WLC boards, distinctly smoother and lighter than those available at present. In order to achieve this objective, a method of the invention is characterized in that the method comprises first subjecting a board web to machine calendering, followed by subjecting the web to a pre-coating process, then by running the web through a long-nip calender and further to an actual coating station/stations for applying one or more coating layers to the web surface, and finally subjecting the web to calender finishing. Downstream of the actual coating station, upstream of calender finishing, the web can be further subjected to additional coating by blade coating for improving the web even further in terms of its smoothness and gloss. The invention will now be described in more detail with reference to the accompanying drawing, in which:
Fig. 1 shows schematically the composition of a typical WLC board, and
Fig. 2 shows schematically one arrangement for implementing a method of the invention.
Fig. 1 depicts schematically a multi-layer structure for one WLC board, which in the illustrated embodiment comprises a base layer 1 of recycled pulp, a filler layer 2, likewise of recycled pulp, a pulp layer 3, and a coating 4 which may consist of several coating layers.
The exemplary embodiment of fig. 2 depicts one finishing method of the invention, wherein a board web W is first passed through a machine calender 10 for profiling its thickness. This is followed by passing the web to a blade coating station 11 for pre-coating in order to improve the web smoothness. Then the web is driven through a long-nip calender, for example a shoe calender 12, as shown in fig. 2, or a belt calender, for improving the topography of web surface. The long-nip calender is followed by passing the web to an actual coating station, which can be for example a spray coating station 13, a curtain coating station, or an Opticoat Duo coating station. In this coating station, the web surface is provided with one or more coating layers for achieving a desired coverage. After the coating process, the web is still subjected to calender finishing, for example with a soft calender 14 or a multi-roll calender for improving the web smoothness and gloss. According to the invention, downstream of the actual coating station and upstream of calender finishing, it is further possible to optionally employ a blade coating for still improving the web smoothness and gloss.

Claims

Claims
1. A method for finishing board, especially recycled board (WLC), characterized in that the method comprises first subjecting a board web (W) to machine calendering (10), followed by subjecting the web to a pre- coating process (11), then by running the web through a long-nip calender (12) and further to an actual coating station (13) for applying one or more coating layers to the web surface, and finally subjecting the web to calender finishing (14).
2. A method as set forth in claim 1, characterized in that the pre-coating process is performed by blade coating (11).
3. A method as set forth in claim 1, characterized in that the pre-coating process is performed by rod coating.
4. A method as set forth in any of claims 1-3, characterized in that the actual coating is performed by spray coating (13), curtain coating, or Opticoat Duo coating.
5. A method as set forth in any of the preceding claims, characterized in that the calender finishing is performed by means of a soft calender (14) or a multi-roll calender.
6. A method as set forth in any of the preceding claims, characterized in that, downstream of the actual coating and upstream of the calender finishing, the method comprises performing an optional additional coating process by blade coating.
PCT/FI2002/000908 2001-12-12 2002-11-15 Method for finishing board WO2003050352A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2002338999A AU2002338999A1 (en) 2001-12-12 2002-11-15 Method for finishing board
DE10297514T DE10297514T5 (en) 2001-12-12 2002-11-15 Process for finishing cardboard

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20012446A FI111281B (en) 2001-12-12 2001-12-12 Cardboard finishing procedure
FI20012446 2001-12-12

Publications (1)

Publication Number Publication Date
WO2003050352A1 true WO2003050352A1 (en) 2003-06-19

Family

ID=8562465

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2002/000908 WO2003050352A1 (en) 2001-12-12 2002-11-15 Method for finishing board

Country Status (5)

Country Link
CN (1) CN1284901C (en)
AU (1) AU2002338999A1 (en)
DE (1) DE10297514T5 (en)
FI (1) FI111281B (en)
WO (1) WO2003050352A1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1467020A1 (en) * 2003-04-11 2004-10-13 Voith Paper Patent GmbH Method for treating a cardboard web
EP1382742A3 (en) * 2002-07-18 2005-02-09 Voith Paper Patent GmbH Apparatus and process for impregnating a web of paper or board
EP1516960A1 (en) * 2003-09-17 2005-03-23 Voith Paper Patent GmbH Process for coating a fibrous web
EP1541760A1 (en) * 2003-12-13 2005-06-15 Voith Paper Patent GmbH Coating device
WO2005095711A1 (en) * 2004-03-30 2005-10-13 Metso Paper, Inc. A method for making a coated fibrous web
EP1593778A1 (en) * 2004-05-06 2005-11-09 Voith Paper Patent GmbH Process and apparatus for treating a web of paper or board
WO2006003263A1 (en) * 2004-07-02 2006-01-12 Metso Paper, Inc. Method and apparatus for coating a fibrous web
JP2014208934A (en) * 2013-03-28 2014-11-06 日本製紙株式会社 Coated white paperboard and production method thereof

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010038530A1 (en) * 2010-07-28 2012-02-02 Voith Patent Gmbh Process for producing a fibrous web, in particular a paper or board web
DE102020112932B4 (en) 2020-05-13 2022-03-24 Voith Patent Gmbh fiber web smoothing

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19545408A1 (en) * 1995-12-06 1997-06-12 Voith Sulzer Papiermasch Gmbh Finishing surface of card web for e.g. box manufacture by precoating, pre-calendering and finish coating
WO1999064672A1 (en) * 1998-06-10 1999-12-16 Valmet Corporation Method for manufacture of paper and a paper machine
WO1999067462A1 (en) * 1998-06-25 1999-12-29 Valmet Corporation Method and arrangement for calendering paper and board before and after coating
US6022448A (en) * 1995-03-16 2000-02-08 Korsnab Ab Coated paperboard for formed articles
WO2000070146A2 (en) * 1999-05-14 2000-11-23 Metso Paper, Inc. Standardizing the cross-direction thickness profile prior to long-nip calendering
WO2000070144A1 (en) * 1999-05-12 2000-11-23 Metso Paper, Inc. Method for the manufacture of paper, and paper machine line

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6022448A (en) * 1995-03-16 2000-02-08 Korsnab Ab Coated paperboard for formed articles
DE19545408A1 (en) * 1995-12-06 1997-06-12 Voith Sulzer Papiermasch Gmbh Finishing surface of card web for e.g. box manufacture by precoating, pre-calendering and finish coating
WO1999064672A1 (en) * 1998-06-10 1999-12-16 Valmet Corporation Method for manufacture of paper and a paper machine
WO1999067462A1 (en) * 1998-06-25 1999-12-29 Valmet Corporation Method and arrangement for calendering paper and board before and after coating
WO2000070144A1 (en) * 1999-05-12 2000-11-23 Metso Paper, Inc. Method for the manufacture of paper, and paper machine line
WO2000070146A2 (en) * 1999-05-14 2000-11-23 Metso Paper, Inc. Standardizing the cross-direction thickness profile prior to long-nip calendering

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1382742A3 (en) * 2002-07-18 2005-02-09 Voith Paper Patent GmbH Apparatus and process for impregnating a web of paper or board
EP1467020A1 (en) * 2003-04-11 2004-10-13 Voith Paper Patent GmbH Method for treating a cardboard web
EP1516960A1 (en) * 2003-09-17 2005-03-23 Voith Paper Patent GmbH Process for coating a fibrous web
EP1541760A1 (en) * 2003-12-13 2005-06-15 Voith Paper Patent GmbH Coating device
WO2005095711A1 (en) * 2004-03-30 2005-10-13 Metso Paper, Inc. A method for making a coated fibrous web
JP2007530811A (en) * 2004-03-30 2007-11-01 メッツォ ペーパー インコーポレイテッド Method for producing coated fiber web
EP1593778A1 (en) * 2004-05-06 2005-11-09 Voith Paper Patent GmbH Process and apparatus for treating a web of paper or board
US7422659B2 (en) 2004-05-06 2008-09-09 Voith Paper Patent Gmbh Method and apparatus for treating a web of paper or board
DE102004022416B4 (en) * 2004-05-06 2013-02-21 Voith Patent Gmbh Method and device for treating a web of paper or cardboard
WO2006003263A1 (en) * 2004-07-02 2006-01-12 Metso Paper, Inc. Method and apparatus for coating a fibrous web
JP2014208934A (en) * 2013-03-28 2014-11-06 日本製紙株式会社 Coated white paperboard and production method thereof

Also Published As

Publication number Publication date
FI111281B (en) 2003-06-30
CN1284901C (en) 2006-11-15
FI20012446A0 (en) 2001-12-12
DE10297514T5 (en) 2004-11-18
CN1602377A (en) 2005-03-30
AU2002338999A1 (en) 2003-06-23

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