EP0653516B1 - Lignocellulosic-material-based product and manufacturing method thereof - Google Patents

Lignocellulosic-material-based product and manufacturing method thereof Download PDF

Info

Publication number
EP0653516B1
EP0653516B1 EP94850175A EP94850175A EP0653516B1 EP 0653516 B1 EP0653516 B1 EP 0653516B1 EP 94850175 A EP94850175 A EP 94850175A EP 94850175 A EP94850175 A EP 94850175A EP 0653516 B1 EP0653516 B1 EP 0653516B1
Authority
EP
European Patent Office
Prior art keywords
ply
fibers
product
softwood
walled
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.)
Expired - Lifetime
Application number
EP94850175A
Other languages
German (de)
French (fr)
Other versions
EP0653516A1 (en
Inventor
Ilkka Kartovaara
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.)
Stora Enso Oyj
Original Assignee
Enso Gutzeit 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 Enso Gutzeit Oy filed Critical Enso Gutzeit Oy
Publication of EP0653516A1 publication Critical patent/EP0653516A1/en
Application granted granted Critical
Publication of EP0653516B1 publication Critical patent/EP0653516B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
    • D21F11/04—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type paper or board consisting on two or more layers

Definitions

  • the present invention relates to a method in accordance with the preamble of claim 1 and a lignocellulosic-material based product according to the preamble of Claim 7.
  • EP-A-0484101 discloses a paper towel having two outer layers of chemical fiber blend of chemical softwood and hardwood fiber and a center layer of an anfractuous high bulk softwood fiber blend of anfractuous fiber and long mechanical pulp fiber.
  • Multi-ply products such as multi-ply paper, board or cardboard comprise more than two plies.
  • multi-ply board comprises three different plies so that the top-liner plies may have identical composition.
  • the center web ply may typically be formed by a web comprising one or more plies of identical composition which are couched together.
  • a multi-ply board acts as a hollow-core beam structure in which the maximum stiffness is attained by a composition having its center ply from a material of maximally high bulk and the outer plies of a liner material of maximally high Young's modulus. Optimally this concept can be utilized by forming the liner and center plies from entirely different types of pulps.
  • a board having the maximum possible bulk is achieved by using mechanical or chemimechanical pulp in the center ply (conventional folding boxboard).
  • foodstuff packaging and graphic art principally uses board grades made from groundwood-free pulp and having their center ply also made from chemical pulp. Resultingly, the manufacture of foodstuff packaging and graphic art boards have involved product lines requiring a high degree of conversion and special skills.
  • the manufacture of mechanical pulps uses softwood almost exclusively. In the pulping process, particularly in the grinding step, long softwood fibers are cut and shortened so that the formation of the center ply made thereof takes place in a satisfactory manner. By contrast, long softwood fibers undergoing the chemical pulping process are not subjected to such severe cutting, whereby the formation properties of the produced pulp are extremely unfavourable.
  • the center ply of board made from chemical pulp is formed from hardwood pulp although its bulk (particularly that of deciduous wood pulp) is generally inferior and thus adverse to the goal of achieving an advantageous structure for the beam structure of the board center ply.
  • Softwood pulp particularly pinewood pulp, contains fibers which give advantageous properties to the outer and center plies of a three-ply board.
  • softwood pulp at the fiber level is not a homogeneous raw material, but rather, comprises two entirely different fiber types: thick-walled summerwood fibers and thin-walled springwood fibers.
  • summerwood fibers of softwood pulp are an ideal raw material for the center ply of a board made from chemical pulp.
  • the bulk of a sheet made therefrom is approx. 40 % better than that of a sheet made from birch pulp.
  • springwood fibers of softwood pulp are an extremely advantageous raw material for the liner ply of a board, particularly if the board will be coated.
  • Such band-shaped fibers form a well closed surface, do not increase the roughness of the surface texture in the same manner as conventional softwood pulp (relative to birch pulp), and additionally, improve the Young's modulus of the liner ply thus contributing to the achievement of maximum stiffness.
  • the different properties required for the liner and center plies of a multi-ply board can be achieved by utilizing the characteristics of the extremely different fiber types contained in the annual growth of softwood.
  • currently known industrial-scale processes fail to achieve completely pure fractions, it is possible to prove on the basis of properties offered by fractions purified through a fractionation process that the stiffness of, e.g., a three-ply board made from chemical pulp can be improved by approx. 30 % relative to conventional board grades.
  • the fibers of softwood pulp can be cut so effectively through refining that a multi-ply product according to the invention can be made using very high proportions of softwood pulp without impairing the properties of the board. It is an object of the invention to improve the fractionation techniques suited for essentially improving the properties of softwood pulp as a raw material of a multi-ply product such as three-ply board made from chemical pulp.
  • the production of a multi-ply product according to the invention aims at maximally effective fractionation summerwood and springwood fibers.
  • fractionated pulp is used which is enriched maximally pure in springwood fibers.
  • the invention is characterized by having the at least one center ply of the multi-ply product enriched with thick-walled summerwood fibers of softwood, further advantageously having the liner plies of the multi-ply product enriched with thinwalled and/or band-shaped springwood fibers of softwood.
  • a particularly advantageous embodiment of the method and product structure according to the invention is characterized by having the liner plies of a multi-ply product, most preferably a multi-ply board, formed from softwood pulp or a mixture of softwood and hardwood pulp, whereby the softwood pulp fraction is enriched with thin-walled springwood fibers, and further having the at least one center ply of a multi-ply board formed from a reject fraction of softwood pulp or a mixture of a reject fraction of softwood pulp and hardwood pulp, said reject fraction resulting from the separation of the springwood fibers and thus being enriched with thick-walled summerwood fibers.

Landscapes

  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Paper (AREA)
  • Compounds Of Unknown Constitution (AREA)
  • Laminated Bodies (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Abstract

The invention concerns a ligno-cellulosic-material-based product and a manufacturing method thereof, in which method the product is formed from multiple plies of cellulosic fibers into a multi-ply product comprising a liner ply and at least one center ply interleaved between the liner plies. The invention is characterized by having said at least one center ply of the multi-ply product enriched with thick-walled summerwood fibers, and further having the liner ply of the multi-ply product advantageously enriched with thin-walled and/or band-shaped springwood fibers.

Description

The present invention relates to a method in accordance with the preamble of claim 1 and a lignocellulosic-material based product according to the preamble of Claim 7.
Multi-ply products belong to the well-known prior art. For instance, EP-A-0484101 discloses a paper towel having two outer layers of chemical fiber blend of chemical softwood and hardwood fiber and a center layer of an anfractuous high bulk softwood fiber blend of anfractuous fiber and long mechanical pulp fiber.
Multi-ply products such as multi-ply paper, board or cardboard comprise more than two plies. Typically, multi-ply board comprises three different plies so that the top-liner plies may have identical composition. Correspondingly, the center web ply may typically be formed by a web comprising one or more plies of identical composition which are couched together. As known, a multi-ply board acts as a hollow-core beam structure in which the maximum stiffness is attained by a composition having its center ply from a material of maximally high bulk and the outer plies of a liner material of maximally high Young's modulus. Optimally this concept can be utilized by forming the liner and center plies from entirely different types of pulps. A board having the maximum possible bulk is achieved by using mechanical or chemimechanical pulp in the center ply (conventional folding boxboard).
However, mechanical pulps do not offer as high brightness and strength as chemical pulps. Hence, foodstuff packaging and graphic art principally uses board grades made from groundwood-free pulp and having their center ply also made from chemical pulp. Resultingly, the manufacture of foodstuff packaging and graphic art boards have involved product lines requiring a high degree of conversion and special skills.
The manufacture of mechanical pulps uses softwood almost exclusively. In the pulping process, particularly in the grinding step, long softwood fibers are cut and shortened so that the formation of the center ply made thereof takes place in a satisfactory manner. By contrast, long softwood fibers undergoing the chemical pulping process are not subjected to such severe cutting, whereby the formation properties of the produced pulp are extremely unfavourable. To achieve proper formation, the center ply of board made from chemical pulp is formed from hardwood pulp although its bulk (particularly that of deciduous wood pulp) is generally inferior and thus adverse to the goal of achieving an advantageous structure for the beam structure of the board center ply.
Softwood pulp, particularly pinewood pulp, contains fibers which give advantageous properties to the outer and center plies of a three-ply board. However, softwood pulp at the fiber level is not a homogeneous raw material, but rather, comprises two entirely different fiber types: thick-walled summerwood fibers and thin-walled springwood fibers. With the exception of the fiber length, summerwood fibers of softwood pulp are an ideal raw material for the center ply of a board made from chemical pulp. The bulk of a sheet made therefrom is approx. 40 % better than that of a sheet made from birch pulp. Again with the exception of the fiber length, springwood fibers of softwood pulp are an extremely advantageous raw material for the liner ply of a board, particularly if the board will be coated. Such band-shaped fibers form a well closed surface, do not increase the roughness of the surface texture in the same manner as conventional softwood pulp (relative to birch pulp), and additionally, improve the Young's modulus of the liner ply thus contributing to the achievement of maximum stiffness.
According to the invention is has recently been discovered that the different properties required for the liner and center plies of a multi-ply board can be achieved by utilizing the characteristics of the extremely different fiber types contained in the annual growth of softwood. Although currently known industrial-scale processes fail to achieve completely pure fractions, it is possible to prove on the basis of properties offered by fractions purified through a fractionation process that the stiffness of, e.g., a three-ply board made from chemical pulp can be improved by approx. 30 % relative to conventional board grades. The fibers of softwood pulp can be cut so effectively through refining that a multi-ply product according to the invention can be made using very high proportions of softwood pulp without impairing the properties of the board. It is an object of the invention to improve the fractionation techniques suited for essentially improving the properties of softwood pulp as a raw material of a multi-ply product such as three-ply board made from chemical pulp.
The production of a multi-ply product according to the invention aims at maximally effective fractionation summerwood and springwood fibers. For the liner plies, such fractionated pulp is used which is enriched maximally pure in springwood fibers. The characterizing properties of the method and product structure according to the invention are disclosed in the appended claims.
The invention is characterized by having the at least one center ply of the multi-ply product enriched with thick-walled summerwood fibers of softwood, further advantageously having the liner plies of the multi-ply product enriched with thinwalled and/or band-shaped springwood fibers of softwood. A particularly advantageous embodiment of the method and product structure according to the invention is characterized by having the liner plies of a multi-ply product, most preferably a multi-ply board, formed from softwood pulp or a mixture of softwood and hardwood pulp, whereby the softwood pulp fraction is enriched with thin-walled springwood fibers, and further having the at least one center ply of a multi-ply board formed from a reject fraction of softwood pulp or a mixture of a reject fraction of softwood pulp and hardwood pulp, said reject fraction resulting from the separation of the springwood fibers and thus being enriched with thick-walled summerwood fibers.
To one skilled in the art it is obvious that the different embodiments of the invention are not limited by the exemplifying embodiments described above, but rather, can be varied within the scope of the annexed claims.

Claims (11)

  1. A method for manufacturing a lignocellulosic-material-based product, in which method the product is formed from multiple plies of cellulosic fibers into a multi-ply product comprising liner plies and at least one center ply interleaved between the liner plies, characterizedin that said at least one center ply of the multi-ply product is enriched with thick-walled summerwood fibers of softwood.
  2. A method as defined in claim 1, characterizedin that the liner plies of the multi-ply product are enriched with thin-walled and/or band-shaped springwood fibers of softwood.
  3. A method as defined in claim 1 or 2, characterized in that the fractions of summerwood and springwood fibers are obtained from softwood pulp, advantageously pinewood pulp.
  4. A method as defined in any foregoing claim, characterizedin that said multi-ply product is multi-ply board, cardboard or paper.
  5. A method as defined in any foregoing claim, characterized in that the liner plies of the multi-ply product, advantageously multi-ply board, are formed from a softwood fraction enriched with thin-walled springwood fibers and that the at least one center ply of the multi-ply board is formed from the reject fraction resulting from the separation of springwood fibers, said reject fraction being enriched with thick-walled summerwood fibers.
  6. A method as defined in any of claims 1-4, characterizedin that the liner plies of the multi-ply product, advantageously multi-ply board, are formed from a mixture of softwood and hardwood pulps having the softwood fraction enriched with thin-walled springwood fibers and that the at least one center ply of the multi-ply board is formed from a mixture of a reject fraction of softwood pulp and hardwood pulp, said reject fraction of softwood pulp resulting from the separation of springwood fibers and thus being enriched with thick-walled summerwood fibers.
  7. Lignocellulosic material based product formed from multiple plies of cellulosic fibers into a multi-ply product comprising liner plies and at least one center ply interleaved between said liner plies, characterized in that said at least one center ply of the multi-ply product is enriched with thick-walled summerwood fibers of softwood.
  8. Lignocellulosic material based product as defined in claim 7, characterized in that the liner plies of said multi-ply product are enriched with thin-walled and/or band-shaped springwood fibers of softwood.
  9. Lignocellulosic material based product as defined in claim 7 - 8, characterizedin that said multi-ply product is multi-ply board, cardboard or paper.
  10. Lignocellulosic material based product as defined in claims 7 - 9, characterized in that the liner plies of the multi-ply product, advantageously multi-ply board, are formed from a softwood fraction enriched with thin-walled springwood fibers and that the at least one center ply of the multi-ply board is formed from the reject fraction resulting from the separation of the springwood fibers, said fraction being enriched with thick-walled summerwood fibers.
  11. Lignocellulosic material based product as defined in claims 7 - 9 characterized in that the liner plies of the multi-ply product, advantageously multi-ply board, are formed from a mixture of softwood and hardwood pulps having the softwood fraction enriched with thin-walled springwood fibers and that the at least one center ply of the multi-ply board is formed from a mixture of a reject fraction of softwood pulp and hardwood pulp, said reject fraction of softwood pulp resulting from the separation of springwood fibers and thus being enriched with thick-walled summerwood fibers.
EP94850175A 1993-11-17 1994-10-07 Lignocellulosic-material-based product and manufacturing method thereof Expired - Lifetime EP0653516B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI935104A FI94653C (en) 1993-11-17 1993-11-17 Product of lignocellulosic material and process for its manufacture
FI935104 1993-11-17

Publications (2)

Publication Number Publication Date
EP0653516A1 EP0653516A1 (en) 1995-05-17
EP0653516B1 true EP0653516B1 (en) 1998-01-14

Family

ID=8538968

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94850175A Expired - Lifetime EP0653516B1 (en) 1993-11-17 1994-10-07 Lignocellulosic-material-based product and manufacturing method thereof

Country Status (7)

Country Link
EP (1) EP0653516B1 (en)
JP (1) JPH07189166A (en)
AT (1) ATE162246T1 (en)
DE (1) DE69407931T2 (en)
ES (1) ES2113078T3 (en)
FI (1) FI94653C (en)
NO (1) NO304238B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE513596C2 (en) 1999-02-22 2000-10-09 Stora Kopparbergs Bergslags Ab Method for making paper or cardboard

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1718096A (en) * 1926-06-28 1929-06-18 Ohio Boxboard Co Method of and apparatus for making paper, boxboard, and the like
SE459263B (en) * 1987-10-16 1989-06-19 Sca Development Ab SAVED TO MAKE WOODEN PAPER PAPERS
US5087324A (en) * 1990-10-31 1992-02-11 James River Corporation Of Virginia Paper towels having bulky inner layer
US5147505A (en) * 1991-05-24 1992-09-15 Union Camp Corporation Multilayer paper and method for the manufacturing thereof

Also Published As

Publication number Publication date
FI94653C (en) 1995-10-10
DE69407931T2 (en) 1998-08-20
FI935104A0 (en) 1993-11-17
JPH07189166A (en) 1995-07-25
NO944352L (en) 1995-05-18
EP0653516A1 (en) 1995-05-17
FI94653B (en) 1995-06-30
ES2113078T3 (en) 1998-04-16
NO304238B1 (en) 1998-11-16
DE69407931D1 (en) 1998-02-19
NO944352D0 (en) 1994-11-15
ATE162246T1 (en) 1998-01-15

Similar Documents

Publication Publication Date Title
EP0660900B1 (en) Multilayer paper and method for the manufacturing thereof
EP2900869B1 (en) Hybrid fiber compositions and uses in containerboard packaging
CA2690571C (en) High yield and enhanced performance fiber
AU2016285836B2 (en) Wood-free fiber compositions and uses in paperboard packaging
US11781270B2 (en) Methods of making multi-ply fibrous sheets
US11926128B2 (en) Light weight linerboard for corrugated board
EP3265609B1 (en) Pulp mixture for production of a paperboard product with high strength in z-direction
CA2046499A1 (en) Chemi-mechanical liner board
FI79575B (en) SAMMANSATT KARTONGMATERIAL.
WO2008003343A1 (en) Method of making an absorbent structure as a multi layer paper, especially a tissue paper
EP0653516B1 (en) Lignocellulosic-material-based product and manufacturing method thereof
JPH08109591A (en) Paper and paper board improved in strength and their production
US3406088A (en) Method of forming multi-ply board with plies of different consistencies
US20230407566A1 (en) Multi-ply paper roducts and methods of making low lint multi-ply paper products
Fineman Let the paper product guide the choice of mechanical pulp
WO2022243822A1 (en) Multi-ply liner for use in corrugated board
JP2024519009A (en) Multi-ply container board for use in corrugated packaging
CN117916422A (en) Multi-ply paper comprising old paper fibers and additional fibers
SU874824A1 (en) Fibrous pulp for making cardboard substrate of corrugated cardboard
Ellis¹ et al. IDEAL FIBERS FOR PULP AND PAPER PRODUCTS

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT CH DE ES FR GB IT LI PT SE

17P Request for examination filed

Effective date: 19951020

17Q First examination report despatched

Effective date: 19961007

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT CH DE ES FR GB IT LI PT SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19980114

Ref country code: CH

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19980114

REF Corresponds to:

Ref document number: 162246

Country of ref document: AT

Date of ref document: 19980115

Kind code of ref document: T

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

ITF It: translation for a ep patent filed
REF Corresponds to:

Ref document number: 69407931

Country of ref document: DE

Date of ref document: 19980219

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19980414

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2113078

Country of ref document: ES

Kind code of ref document: T3

ET Fr: translation filed
REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20091014

Year of fee payment: 16

Ref country code: ES

Payment date: 20091023

Year of fee payment: 16

Ref country code: DE

Payment date: 20091026

Year of fee payment: 16

Ref country code: AT

Payment date: 20091015

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20091029

Year of fee payment: 16

Ref country code: GB

Payment date: 20091022

Year of fee payment: 16

Ref country code: FR

Payment date: 20091110

Year of fee payment: 16

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20101007

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20101102

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20110630

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 69407931

Country of ref document: DE

Effective date: 20110502

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20101007

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20101007

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20101008

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20111118

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20101007

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20101008

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110502