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WO1992013137A1 - A kraft liner in multi-layer construction - Google Patents

A kraft liner in multi-layer construction Download PDF

Info

Publication number
WO1992013137A1
WO1992013137A1 PCT/SE1992/000014 SE9200014W WO9213137A1 WO 1992013137 A1 WO1992013137 A1 WO 1992013137A1 SE 9200014 W SE9200014 W SE 9200014W WO 9213137 A1 WO9213137 A1 WO 9213137A1
Authority
WO
WIPO (PCT)
Prior art keywords
pulp
top layer
liner
liner according
sulphate pulp
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.)
Ceased
Application number
PCT/SE1992/000014
Other languages
French (fr)
Inventor
Nils Hagen
Ragnhild DÖLLING
Sture Backlund
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.)
SCA Nordliner AB
Original Assignee
SCA Nordliner AB
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 SCA Nordliner AB filed Critical SCA Nordliner AB
Publication of WO1992013137A1 publication Critical patent/WO1992013137A1/en
Priority to FI924268A priority Critical patent/FI97558C/en
Priority to NO923694A priority patent/NO180453B/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/14—Secondary fibres
    • 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
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
    • D21H11/04—Kraft or sulfate pulp
    • 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
    • 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply
    • D21H27/38—Multi-ply at least one of the sheets having a fibrous composition differing from that of other sheets

Definitions

  • the present invention relates to a presentation liner, i.e. a kraft liner, in multi-layer construction.
  • presentation liner is meant an improved liner quality which gives good printability with respect to reproduc ⁇ tion, and uniformity in print, brilliance, contrast and sharpness.
  • Presentation liners are used when desiring high print quality, half-tone print and multicolour print.
  • the liner is also used for printing bar codes and informa ⁇ tion which includes small type faces.
  • a presentation liner shall have a high degree of smooth ⁇ ness, adapted luminance, uniform absorption and a high degree of purity.
  • Kraft liners which form the flat sheets in corrugated fibreboard, also referred to as facing paper, are traditionally produced primarily from kraft pulp in two or three layers to a surface weight of
  • Kraft liners, or facing papers are normally produced from softwood sulphate pulp and hardwood sulphate pulp, the composition of the pulp depending on the particular requirements of a given pulp quality.
  • Hardwood pulp provides a better surface than softwood pulp, and is slightly cheaper than softwood pulp. It is also known to admix secondary fibres in kraft liners, in at least one layer, wherein fine printing waste is normally used as a starting material.
  • the Swiss Patent Specification CH 633 482 describes a method of manufacturing high strength outerply for corrugated board, i.e. a liner which is comprised of at least two layers, of which one layer is a waste paper semimanufacture, while the other layer, or the other layers, is/are produced from chemimechanical softwood pulp (CMP) . It is said that this method of manufacture will reduce drastically or completely obviate the use of kraft pulp or kraft recycled fibres, and therewith improve the use of the wood starting material.
  • CMP chemimechanical softwood pulp
  • the patent specification also describes as part of the known art a method of extending kraft pulp with a modi ⁇ fied ther omechanical pulp (MTMP) or with a chemithermo- mechanical pulp (CTMP) respectively.
  • MTMP modi ⁇ fied ther omechanical pulp
  • CTMP chemithermo- mechanical pulp
  • the present invention relates to a so-called presentation liner, i.e. a kraft liner, which is characterized in that the liner comprises a plurality of layers, preferably 2-3 layers, in that from 55-100% of the pulp forming the outer layer or layers is com ⁇ prised of a bleached hardwood sulphate pulp which is free from chlorine chemical and which includes an addi ⁇ tion of 0-15% pigment, e.g. calcined clay, said concen ⁇ trations being calculated in percent on absolutely dry pulp; and in that the remainder of the pulp in the outer layer (the top layer) is comprised of unbleached soft- wood sulphate pulp or of bleached softwood sulphate pulp that is free from chlorine chemicals.
  • a so-called presentation liner i.e. a kraft liner
  • the liner comprises a plurality of layers, preferably 2-3 layers, in that from 55-100% of the pulp forming the outer layer or layers is com ⁇ prised of a bleached hardwood
  • the outer layer (top side) of the inventive liner has a luminance (Y-value, SCAN-method P 8:75) of 45-85%, or expressed as brightness 32-85% (SCAN-method P 3:75).
  • At least 80% of the hardwood pulp in the top layer consists of birch.
  • the hardwood pulp may be bleached with oxygen in one or more stages, or bleached in known combinations of oxygen and peroxide stages.
  • ⁇ 2 preferably from 30-90 g/m and the pulp which forms this
  • 5 layer is preferably refined to a degree of refinement of
  • the pulp in the remaining layers of the liner consists 10 of unbleached softwood sulphate pulp in mixture with 0- 10% unbleached hardwood sulphate pulp and 0-50% recycled fibres.
  • the surface of the top layer preferably has a Bendtsen roughness number beneath 1000 ml/min. (SCAN-P 21:67) .
  • a liner according to the present invention was produced with existing machinery and by means of generally tradi- 20 tional techniques.
  • the liner comprised two layers, of which the top layer was produced from oxygen-gas bleached hardwood sulphate pulp (> 80% birch) with kappa number 12.
  • the pulp was purchased from another manufac ⁇ turer. The pulp was clean and had been refined to SR-
  • the top layer had a surface weight of
  • the base layer was produced from softwood sulphate pulp having a kappa number of about 75.
  • the pulp was refined 30 to an SR-number of about 21-22, with the addition of 10% recycled corrugated fibreboard pulp.
  • the manufactured product had a total surface weight of

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Paper (AREA)

Abstract

A presentation liner, i.e. a kraft liner, comprised of several layers, preferably of 2-3 layers, wherein from 50-100 % of the pulp forming the top layer consists of a bleached hardwood sulphate pulp which contains no chlorine chemical and to which there is added 0-15 % pigment, calculated on absolutely dry pulp. The remainder of the pulp forming the top layer is comprised of unbleached softwood sulphate pulp or of bleached softwood sulphate pulp that contains no chlorine chemical. The top surface of the liner has a luminance (Y-value, SCAN-method P 8:75) of 45-85 %, or measured as brightness 32-85 % (SCAN-method P 3:75).

Description

A Kraft Liner in Multi-layer Construction
The present invention relates to a presentation liner, i.e. a kraft liner, in multi-layer construction. By presentation liner is meant an improved liner quality which gives good printability with respect to reproduc¬ tion, and uniformity in print, brilliance, contrast and sharpness.
Presentation liners are used when desiring high print quality, half-tone print and multicolour print. The liner is also used for printing bar codes and informa¬ tion which includes small type faces.
A presentation liner shall have a high degree of smooth¬ ness, adapted luminance, uniform absorption and a high degree of purity. Kraft liners which form the flat sheets in corrugated fibreboard, also referred to as facing paper, are traditionally produced primarily from kraft pulp in two or three layers to a surface weight of
2
100-440 g/m and are included generally in kraft papers.
Kraft liners, or facing papers, are normally produced from softwood sulphate pulp and hardwood sulphate pulp, the composition of the pulp depending on the particular requirements of a given pulp quality. Hardwood pulp provides a better surface than softwood pulp, and is slightly cheaper than softwood pulp. It is also known to admix secondary fibres in kraft liners, in at least one layer, wherein fine printing waste is normally used as a starting material.
The Swiss Patent Specification CH 633 482 describes a method of manufacturing high strength outerply for corrugated board, i.e. a liner which is comprised of at least two layers, of which one layer is a waste paper semimanufacture, while the other layer, or the other layers, is/are produced from chemimechanical softwood pulp (CMP) . It is said that this method of manufacture will reduce drastically or completely obviate the use of kraft pulp or kraft recycled fibres, and therewith improve the use of the wood starting material.
The patent specification also describes as part of the known art a method of extending kraft pulp with a modi¬ fied ther omechanical pulp (MTMP) or with a chemithermo- mechanical pulp (CTMP) respectively.
As before mentioned, the present invention relates to a so-called presentation liner, i.e. a kraft liner, which is characterized in that the liner comprises a plurality of layers, preferably 2-3 layers, in that from 55-100% of the pulp forming the outer layer or layers is com¬ prised of a bleached hardwood sulphate pulp which is free from chlorine chemical and which includes an addi¬ tion of 0-15% pigment, e.g. calcined clay, said concen¬ trations being calculated in percent on absolutely dry pulp; and in that the remainder of the pulp in the outer layer (the top layer) is comprised of unbleached soft- wood sulphate pulp or of bleached softwood sulphate pulp that is free from chlorine chemicals.
It has been found that the outer layer (top side) of the inventive liner has a luminance (Y-value, SCAN-method P 8:75) of 45-85%, or expressed as brightness 32-85% (SCAN-method P 3:75).
According to one particular embodiment of the invention, at least 80% of the hardwood pulp in the top layer consists of birch. The hardwood pulp may be bleached with oxygen in one or more stages, or bleached in known combinations of oxygen and peroxide stages.
( The surface weight of the outer layer, or top layer, is
♦ 2 preferably from 30-90 g/m and the pulp which forms this
5 layer is preferably refined to a degree of refinement of
20-40 SR.
According to one particular embodiment of the invention, the pulp in the remaining layers of the liner consists 10 of unbleached softwood sulphate pulp in mixture with 0- 10% unbleached hardwood sulphate pulp and 0-50% recycled fibres. The surface of the top layer preferably has a Bendtsen roughness number beneath 1000 ml/min. (SCAN-P 21:67) .
15
Example
A liner according to the present invention was produced with existing machinery and by means of generally tradi- 20 tional techniques. The liner comprised two layers, of which the top layer was produced from oxygen-gas bleached hardwood sulphate pulp (> 80% birch) with kappa number 12. The pulp was purchased from another manufac¬ turer. The pulp was clean and had been refined to SR-
25 number 24-25. The top layer had a surface weight of
2 about 60 g/m .
The base layer was produced from softwood sulphate pulp having a kappa number of about 75. The pulp was refined 30 to an SR-number of about 21-22, with the addition of 10% recycled corrugated fibreboard pulp.
The manufactured product had a total surface weight of
2 186 g/m . The Bendtsen roughness number (SCAN-P 21:67)
35 was below 1000 ml/min. and the luminance of the presen¬ tation liner was 54% (Y-value, SCAN-P 8:75).

Claims

Claims
1. A presentation liner in multi-layer construction, preferably a construction consisting of 2-3 layers, c h a r a c t e r i z e d in that the top layer is formed from pulp of which 50-100% is comprised of hard¬ wood sulphate pulp free from chlorine chemicals and admixed with 0-15% pigment, e.g. calcined clay, calcu- lated on absolutely dry pulp; in that the remainder of the pulp forming the top layer consists of unbleached softwood sulphate pulp or of bleached softwood sulphate pulp free from chlorine chemicals; and in that the top surface of the liner has a luminance (Y-value, SCAN- method P 8:75), of 45-85%, or measured as brightness of 32-85% (SCAN-method P 3:75).
2. A liner according to Claim 1, c h a r a c ¬ t e r i z e d in that the top layer is comprised of pulp in which more than 80% of the hardwood consists of birch.
3. A liner according to Claim 1, c h a r a c ¬ t e r i z e d in that the hardwood sulphate pulp has been bleached with oxygen in one or more stages.
4. A liner according to Claim 1, c h a r a c ¬ t e r i z e d in that the hardwood sulphate pulp has been bleached in a combination of oxygen and peroxide stages.
5. A liner according to Claim 1, c h a r a c ¬ t e r i z e d in that the top layer has a surface
2 weight of 30-90 g/m . 6. A liner according to Claim 1, c h a r a c ¬ t e r i z e d in that the pulp in the top layer has been refined to 20-40 SR.
7. A liner according to Claim 1, c h a r a c ¬ t e r i z e d in that layers other than the top layer are formed from unbleached softwood sulphate pulp and 0-10% unbleached hardwood sulphate pulp and 0-50% recycled fibres.
8. A liner according to Claim 1, c h a r a c ¬ t e r i z e d in that the top layer has a Bendtsen roughness number beneath 1000 ml/min. (SCAN-P 21:67).
AMENDED CLAIMS
[received by the International Bureau on 22 June 1992 (22.06.92); original claim. 1 amended; other claims unchanged (2 pages)]
1. Λ presentation liner in multi-layer construction, preferably a construction consisting of 2-3 layers, c h a r a c t e r i z e d in that the top layer is formed from pulp of which 50-100% is comprised of bleached hard¬ wood sulphate pulp free from chlorine chemicals and admixed with 0-15% pigment, e.g. calcined clay, calcu- lated on absolutely dry pulp; in that the remainder of the pulp forming the top layer consists of unbleached softwood sulphate pulp or of bleached softwood sulphate pulp free from chlorine chemicals; and in that the top surface of the liner has a luminance (Y-value, SCΛN- method P 8:75), of 45-85%, or measured as brightness of
32-85% (SCAN-method P 3:75).
2. Λ liner according to Claim 1, c h a r a c ¬ t e r i z e d in that the top layer is comprised of pulp in which more than 80% of the hardwood consists of birch.
3. Λ liner according to Claim 1, c h a r a c ¬ t e r i z e d in that the hardwood sulphate pulp has been bleached with oxygen in one or more stages.
4. Λ liner according to Claim 1, c h a r a c ¬ t e r i z e d in that the hardwood sulphate pulp has been bleached in a combination of oxygen and peroxide stages.
5. Λ liner according to Claim 1, c h a r a c ¬ t e r i z e d in that the top layer has a surface
2 weight of 30-90 q/m .
6. A liner according to Claim 1, c h a r a c ¬ t e r i z e d in that the pulp in the top layer has been refined to 20-40 SR.
7. A liner according to Claim 1, c h a r a c ¬ t e r i z e d in that layers other than the top layer are formed from unbleached softwood sulphate pulp and 0-10% unbleached hardwood sulphate pulp and 0-50% recycled fibres.
8. A liner according to Claim 1, c h a r a c ¬ t e r i z e d in that the top layer has a Bendtsen roughness number beneath 1000 ml/min. (SCAN-P 21:67)
PCT/SE1992/000014 1991-01-24 1992-01-13 A kraft liner in multi-layer construction Ceased WO1992013137A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FI924268A FI97558C (en) 1991-01-24 1992-09-23 Powerliner in multi-layer construction
NO923694A NO180453B (en) 1991-01-24 1992-09-23 Powerliner in multilayer construction

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9100215-4 1991-01-24
SE9100215A SE467785B (en) 1991-01-24 1991-01-24 POWER LINES IN MULTILAYER CONSTRUCTION

Publications (1)

Publication Number Publication Date
WO1992013137A1 true WO1992013137A1 (en) 1992-08-06

Family

ID=20381701

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1992/000014 Ceased WO1992013137A1 (en) 1991-01-24 1992-01-13 A kraft liner in multi-layer construction

Country Status (6)

Country Link
EP (1) EP0522135A1 (en)
FI (1) FI97558C (en)
NO (1) NO180453B (en)
PT (1) PT100053A (en)
SE (1) SE467785B (en)
WO (1) WO1992013137A1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0881331A1 (en) * 1996-06-13 1998-12-02 Hoffman Environmental Systems, Inc. Multi-ply paper product and method of making same
US6187141B1 (en) 1997-09-24 2001-02-13 Uni-Charm Corporation Water-disintegratable fibrous sheet having layered structure and wiping sheet comprising the same
EP2267206A1 (en) 2009-06-09 2010-12-29 Buckeye Technologies Inc. Dyed cellulose comminution sheet, dyed nonwoven material, and processes for their production
EP2404756A1 (en) * 2010-07-06 2012-01-11 Sanlucar Fruit S.L. Corrugated carboard sheet for the manufacturing of boxes
JP2015218422A (en) * 2014-05-21 2015-12-07 北越紀州製紙株式会社 Multilayer paper
CN111655928A (en) * 2017-12-28 2020-09-11 克拉宾股份公司 Kraft paper made from short chemical fibers
WO2022160024A1 (en) 2021-01-27 2022-08-04 Klabin S.A. White top kraftliner paper, method for producing said paper, use of the paper and packaging
AT524998A1 (en) * 2021-04-21 2022-11-15 Mondi Ag Printable multi-ply paper for packaging and method of making same

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
Dialog Information Services, File 240, PAPERCHEM No: 58-06631, Dialog Accession No. 426631, V. GRUDININ et al.: "Packaging Linerboard", USSR Pat. 1,320,314, issued June 30, 1987. *
Dialog Information Services, File 240, PAPERCHEM No: 59-01679, Dialog Accession No. 441679, R.A. HORN et al.: "Press-Drying. Chemithermomechanical Pulp for Linerboard and Corrugating Medium", Drying. Vol. 2, Paper 19: 18 p (May 19-23, 1986). *
Dialog Information Services, File 240, PAPERCHEM No: 60-02432, Dialog Accession No. 462432, A.D. ZHELEZNIKOVA et al.: "Use of Hardwood Pulp in the Manufacture of Board", Bumazh. Prom. No. 12: 11-12 (December 1974). *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0881331A1 (en) * 1996-06-13 1998-12-02 Hoffman Environmental Systems, Inc. Multi-ply paper product and method of making same
US6187141B1 (en) 1997-09-24 2001-02-13 Uni-Charm Corporation Water-disintegratable fibrous sheet having layered structure and wiping sheet comprising the same
EP2267206A1 (en) 2009-06-09 2010-12-29 Buckeye Technologies Inc. Dyed cellulose comminution sheet, dyed nonwoven material, and processes for their production
EP2749680A1 (en) 2009-06-09 2014-07-02 Buckeye Technologies Inc. Dyed cellulose comminution sheet, dyed nonwoven material, and processes for their production
EP2404756A1 (en) * 2010-07-06 2012-01-11 Sanlucar Fruit S.L. Corrugated carboard sheet for the manufacturing of boxes
JP2015218422A (en) * 2014-05-21 2015-12-07 北越紀州製紙株式会社 Multilayer paper
CN111655928A (en) * 2017-12-28 2020-09-11 克拉宾股份公司 Kraft paper made from short chemical fibers
WO2022160024A1 (en) 2021-01-27 2022-08-04 Klabin S.A. White top kraftliner paper, method for producing said paper, use of the paper and packaging
AT524998A1 (en) * 2021-04-21 2022-11-15 Mondi Ag Printable multi-ply paper for packaging and method of making same
AT524998B1 (en) * 2021-04-21 2023-02-15 Mondi Ag Printable multi-ply paper for packaging and method of making same

Also Published As

Publication number Publication date
FI97558B (en) 1996-09-30
NO180453B (en) 1997-01-13
NO923694L (en) 1992-09-23
SE9100215L (en) 1992-07-25
NO923694D0 (en) 1992-09-23
FI924268L (en) 1992-09-23
FI97558C (en) 1998-06-17
EP0522135A1 (en) 1993-01-13
SE467785B (en) 1992-09-14
SE9100215D0 (en) 1991-01-24
PT100053A (en) 1994-04-29
FI924268A0 (en) 1992-09-23

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