US20070284070A1 - Paper Manufacturing Process - Google Patents

Paper Manufacturing Process Download PDF

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Publication number
US20070284070A1
US20070284070A1 US11/578,584 US57858405A US2007284070A1 US 20070284070 A1 US20070284070 A1 US 20070284070A1 US 57858405 A US57858405 A US 57858405A US 2007284070 A1 US2007284070 A1 US 2007284070A1
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US
United States
Prior art keywords
fibres
polymer
wire
man
web
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.)
Abandoned
Application number
US11/578,584
Inventor
Ari Kiviranta
Lauri Verkasalo
Minna Rantanen
Kirsi Hirvonen
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.)
Metsa Board Oyj
Original Assignee
M Real Oyj
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 M Real Oyj filed Critical M Real Oyj
Publication of US20070284070A1 publication Critical patent/US20070284070A1/en
Abandoned legal-status Critical Current

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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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/06—Paper forming aids
    • D21H21/10—Retention agents or drainage improvers
    • 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
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • 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
    • D21H17/20—Macromolecular organic compounds
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D21H17/25—Cellulose
    • D21H17/26—Ethers thereof
    • 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
    • D21H17/20—Macromolecular organic compounds
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D21H17/31—Gums
    • D21H17/32—Guar or other polygalactomannan gum
    • 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
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
    • D21H17/375—Poly(meth)acrylamide
    • 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
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/41—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups
    • D21H17/42—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups anionic
    • D21H17/43—Carboxyl groups or derivatives thereof

Definitions

  • the present invention relates to a method for manufacturing a web comprising wood-based fibres and man-made fibres.
  • man-made fibres i.e. synthetic fibres or regenerated fibres
  • wood-based fibres While the wood-based fibres used have an average fibre length of 1.2 mm, the fibre length of man-made fibres used is usually in the order of 5 mm.
  • problems are caused by different fibre lengths and also various other fibre properties.
  • One problem is the flocculation of the fibres in the headbox, resulting in poor formation of the web. Long fibres adhere to each other, and they also capture short fibres in the fibre bundles of the long fibres.
  • the flocculation tendency can be alleviated by reducing the consistency of the pulp, but the production parameters may thus become such that the production is not possible with conventional machinery and/or the machine speeds must be dropped so low that the production is not profitable.
  • Attempts have also been made to manufacture multi-layered paper, wherein diluted pulps can be run at a relatively high speed.
  • paper qualities of similar types have been shifted to be manufactured by wet web formation with machinery for non-woven fabrics. To sum up, it has been problematic to run webs comprising man-made fibres in paper machines, and attempts have been made to solve this problem for about 30 years.
  • the method according to the invention is characterized in that a polymer is added to a fibre suspension comprising wood-based fibres and man-made fibres, to improve the web formation and to slow down the removal of water in the wire section of the paper machine.
  • the above-mentioned problems can be reduced or eliminated by using a polymer mixed in the pulp to improve the web formation and to slow down the removal of water in the wire section of the paper machine.
  • the web can be manufactured by utilizing a normal paper machine construction, because there is no need to lower the consistency of the pulp, and thus the size of the slice is sufficient for dosing the pulp onto the wire.
  • the consistency is about 1% and the normal running speed is 800 m/min.
  • the improvement in the web formation is manifested by the smoothness of the web.
  • mechanical means can be used to have an effect on the placement of the fibres in the web.
  • the mechanical means include, for example, the intrinsic improvement in the web formation during dewatering, due to the nature of the dewatering, because the fibres tend to move to locations with lower flow resistance and shear forces due to the speed difference between the headbox discharge and the wire.
  • Other possible improving mechanisms include shearing forces generated by shaking of the wire and/or oscillation of the surface of the pulp layer.
  • Further mechanical means include the effect of suction boxes underneath the forming wire, or it is possible to use a roll on the upper surface of the forming wire to prevent the formation of fibre bundles.
  • the polymer to be used in the method according to the invention has a high molecular weight and is relatively unbranched.
  • the polymer is preferably anionic.
  • Suitable polymers to be used include, for example, anionic polyacrylamide, CMC, guargum, or compounds of these.
  • An anionic polyacrylamide suitable for the purpose has a molecular weight of at least 10,000,000 g/mol and an electric charge density of about 30%, and it is dosed 0.2 to 2 kg per ton of fibre.
  • CMC has a molecular weight of at least 750,000 g/mol, and it is dosed 2 to 8 kg per ton of fibre.
  • the dosage of the polymer can be reduced, because the polymer hardly adheres to the fibre and is thus returned to use.
  • the pH value, at which the method works, is neutral or alkaline.
  • the pH of the fibre suspension is adjusted to at least 6.5, for the polymer to function in the process.
  • the polymer does not function at too high a pH value either.
  • the polymer is added either into the pulp mixing tank, before the machine screen, or after the machine screen.
  • the method according to the invention is used primarily in the manufacture of wallpaper, particularly in connection with so-called paste-the-wall wallpapers (the adhesive agent is applied onto the wall to be papered and the dry wallpaper is placed onto the adhesive).
  • the content of man-made fibres with a typical fibre length of 5 mm is often 10 weight-%, but in a wallpaper made by the method according to the invention, the content may be 15 to 50 weight-%.
  • the man-made fibre to be used is polyester, because it has a density suitable for manufacturing with pulp fibres.
  • the method is cost-efficient, as the paper can be made according to the conventional paper machine concept.
  • the method according to the invention can be applied in products which are presently made by the wet web formation technique, such as filter papers, dust bags for vacuum cleaners, wet-strength towels, bed sheets and linen papers.
  • FIG. 1 illustrates the formation (Ambertec formation) as a function of the consistency in the headbox.
  • the dosage of anionic polyacrylamide was 1 to 2 kg per ton of fibre.
  • the dosage of CMC was 5 to 10 kg per ton of fibre.
  • the pH of the fibre suspension in connection with acrylamide was from 7 to 8.
  • the pH of the fibre suspension in connection with CMC was from 7 to 8.

Abstract

The invention relates to a method for manufacturing a web comprising wood-based fibres and man-made fibres. A polymer is added to a fibre suspension comprising wood-based fibres and man-made fibres to improve the web formation and to slow down the removal of water in the wire section of the paper machine.

Description

  • The present invention relates to a method for manufacturing a web comprising wood-based fibres and man-made fibres.
  • To improve the strength and/or dimensional stability of webs made of wood-based fibres, it is possible to admix man-made fibres, i.e. synthetic fibres or regenerated fibres, with wood-based fibres. While the wood-based fibres used have an average fibre length of 1.2 mm, the fibre length of man-made fibres used is usually in the order of 5 mm. In the manufacture of the fibre, problems are caused by different fibre lengths and also various other fibre properties. One problem is the flocculation of the fibres in the headbox, resulting in poor formation of the web. Long fibres adhere to each other, and they also capture short fibres in the fibre bundles of the long fibres.
  • The flocculation tendency can be alleviated by reducing the consistency of the pulp, but the production parameters may thus become such that the production is not possible with conventional machinery and/or the machine speeds must be dropped so low that the production is not profitable. Attempts have also been made to manufacture multi-layered paper, wherein diluted pulps can be run at a relatively high speed. Furthermore, paper qualities of similar types have been shifted to be manufactured by wet web formation with machinery for non-woven fabrics. To sum up, it has been problematic to run webs comprising man-made fibres in paper machines, and attempts have been made to solve this problem for about 30 years.
  • The method according to the invention is characterized in that a polymer is added to a fibre suspension comprising wood-based fibres and man-made fibres, to improve the web formation and to slow down the removal of water in the wire section of the paper machine.
  • The above-mentioned problems can be reduced or eliminated by using a polymer mixed in the pulp to improve the web formation and to slow down the removal of water in the wire section of the paper machine. The web can be manufactured by utilizing a normal paper machine construction, because there is no need to lower the consistency of the pulp, and thus the size of the slice is sufficient for dosing the pulp onto the wire. Typically, the consistency is about 1% and the normal running speed is 800 m/min.
  • The improvement in the web formation is manifested by the smoothness of the web. As the polymer slows down the exit of water, mechanical means can be used to have an effect on the placement of the fibres in the web. The mechanical means include, for example, the intrinsic improvement in the web formation during dewatering, due to the nature of the dewatering, because the fibres tend to move to locations with lower flow resistance and shear forces due to the speed difference between the headbox discharge and the wire. Other possible improving mechanisms include shearing forces generated by shaking of the wire and/or oscillation of the surface of the pulp layer. Further mechanical means include the effect of suction boxes underneath the forming wire, or it is possible to use a roll on the upper surface of the forming wire to prevent the formation of fibre bundles.
  • The polymer to be used in the method according to the invention has a high molecular weight and is relatively unbranched. The polymer is preferably anionic.
  • Suitable polymers to be used include, for example, anionic polyacrylamide, CMC, guargum, or compounds of these. An anionic polyacrylamide suitable for the purpose has a molecular weight of at least 10,000,000 g/mol and an electric charge density of about 30%, and it is dosed 0.2 to 2 kg per ton of fibre. CMC has a molecular weight of at least 750,000 g/mol, and it is dosed 2 to 8 kg per ton of fibre. During the process, the dosage of the polymer can be reduced, because the polymer hardly adheres to the fibre and is thus returned to use.
  • The pH value, at which the method works, is neutral or alkaline. The pH of the fibre suspension is adjusted to at least 6.5, for the polymer to function in the process. On the other hand, the polymer does not function at too high a pH value either. The polymer is added either into the pulp mixing tank, before the machine screen, or after the machine screen.
  • The method according to the invention is used primarily in the manufacture of wallpaper, particularly in connection with so-called paste-the-wall wallpapers (the adhesive agent is applied onto the wall to be papered and the dry wallpaper is placed onto the adhesive). In wallpaper, the content of man-made fibres with a typical fibre length of 5 mm is often 10 weight-%, but in a wallpaper made by the method according to the invention, the content may be 15 to 50 weight-%. Normally, the man-made fibre to be used is polyester, because it has a density suitable for manufacturing with pulp fibres. In the manufacture of wallpaper, the method is cost-efficient, as the paper can be made according to the conventional paper machine concept.
  • In addition to wallpaper, the method according to the invention can be applied in products which are presently made by the wet web formation technique, such as filter papers, dust bags for vacuum cleaners, wet-strength towels, bed sheets and linen papers.
  • In the following, the invention will be described with reference to an example and a figure. The figure illustrates the formation (Ambertec formation) as a function of the consistency in the headbox.
  • An experiment was made to find out the effect of polyacrylamide and CMC on the formation at different consistencies. The reference was a sample to which no polymer had been added to improve the formation and to slow down the dewatering.
  • The dosage of anionic polyacrylamide was 1 to 2 kg per ton of fibre. The dosage of CMC was 5 to 10 kg per ton of fibre. The pH of the fibre suspension in connection with acrylamide was from 7 to 8. The pH of the fibre suspension in connection with CMC was from 7 to 8.
  • The invention is not restricted to the description above, but it may vary within the scope of the claims.

Claims (6)

1. A method for the manufacture of a web comprising wood-based fibres and man-made fibres, the method comprising adding a polymer to a fibre suspension comprising the wood-based fibres and man-made fibres to improve the web formation and to slow down the removal of water in the wire section of the paper machine, characterized in that the fibre suspension is treated mechanically during the web formation on a wire by shaking the wire, allowing the surface of the pulp layer to oscillate, or using a roll on the upper surface of the wire.
2. The method according to claim 1, characterized in that the polymer is an anionic polyacrylamide with a molecular weight of at least 10,000,000 g/mol.
3. The method according to claim 1, characterized in that the polymer is carboxymethyl cellulose with a molecular weight of at least 750,000 g/mol.
4. The method according to claim 1, characterized in that the polymer is guargum.
5. The method according to claim 1, characterized in that the polymer is added into a pulp mixing tank, before the machine screen or after the machine screen.
6. The method according to claim 1, characterized in that the pH of the fibre suspension is adjusted to at least 6.5.
US11/578,584 2004-04-14 2005-04-14 Paper Manufacturing Process Abandoned US20070284070A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI20045132 2004-04-14
FI20045132A FI20045132A (en) 2004-04-14 2004-04-14 Paper manufacturing process
PCT/FI2005/050118 WO2005100689A1 (en) 2004-04-14 2005-04-14 Paper manufacturing process

Publications (1)

Publication Number Publication Date
US20070284070A1 true US20070284070A1 (en) 2007-12-13

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US11/578,584 Abandoned US20070284070A1 (en) 2004-04-14 2005-04-14 Paper Manufacturing Process

Country Status (7)

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US (1) US20070284070A1 (en)
EP (1) EP1735497A1 (en)
JP (1) JP2007532792A (en)
CN (1) CN1942630A (en)
CA (1) CA2561033A1 (en)
FI (1) FI20045132A (en)
WO (1) WO2005100689A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105786052B (en) * 2014-12-16 2020-09-08 艺康美国股份有限公司 Online control and reaction method for pH adjustment

Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2626214A (en) * 1949-06-14 1953-01-20 C H Dexter & Sons Inc Paper from long synthetic fibers and partially water soluble sodium carboxymethylcellulose and method
US3019157A (en) * 1958-10-06 1962-01-30 American Cyanamid Co Web-forming fibrous suspensions of improved freeness
US3391057A (en) * 1965-07-06 1968-07-02 Dow Chemical Co Suspensions of synthetic polymer fibrous products containing acrylamide polymer and method of making a paper web therefrom
US3794557A (en) * 1969-03-26 1974-02-26 Johnson & Johnson Method of making isotropic fibrous webs containing textile length fibers
US3808095A (en) * 1971-05-13 1974-04-30 Johnson & Johnson Wet-formed nonwoven textile fabrics and methods of making the same
US3834983A (en) * 1973-03-15 1974-09-10 Dexter C & Sons Inc Process of forming wet laid tufted non-woven fibrous web from a viscous fibrous dispersion and product
US4200488A (en) * 1975-02-20 1980-04-29 International Paper Company Viscous dispersion for forming wet-laid, non-woven fabrics
US4487657A (en) * 1978-06-20 1984-12-11 Soci/e/ t/e/ Anonyme dite: Arjomari-Prioux Method for preparing a fibrous sheet
US4822452A (en) * 1987-04-06 1989-04-18 James River Corporation Of Virginia Manufacture of wet laid nonwoven webs
US4925528A (en) * 1987-04-06 1990-05-15 James River Corporation Of Virginia Manufacture of wetlaid nonwoven webs
US5133835A (en) * 1990-03-05 1992-07-28 International Paper Company Printable, high-strength, tear-resistant nonwoven material and related method of manufacture
US5238534A (en) * 1992-01-24 1993-08-24 James River Corporation Of Virginia Wetlaid nonwovens on high speed machines
US5403444A (en) * 1990-03-05 1995-04-04 International Paper Company Printable, high-strength, tear-resistant nonwoven material and related method of manufacture
US6100322A (en) * 1995-07-07 2000-08-08 Eka Chemicals Ab Process for the production of paper
US6113741A (en) * 1996-12-06 2000-09-05 Eka Chemicals Ab Process for the production of paper
US6379497B1 (en) * 1996-09-20 2002-04-30 Fort James Corporation Bulk enhanced paperboard and shaped products made therefrom
US6511579B1 (en) * 1998-06-12 2003-01-28 Fort James Corporation Method of making a paper web having a high internal void volume of secondary fibers and a product made by the process

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE352669T1 (en) * 2002-10-02 2007-02-15 Fort James Corp SURFACE-TREATED HEAT BONDABLE FIBER CONTAINING PAPER PRODUCTS AND METHOD FOR PRODUCING THEM

Patent Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2626214A (en) * 1949-06-14 1953-01-20 C H Dexter & Sons Inc Paper from long synthetic fibers and partially water soluble sodium carboxymethylcellulose and method
US3019157A (en) * 1958-10-06 1962-01-30 American Cyanamid Co Web-forming fibrous suspensions of improved freeness
US3391057A (en) * 1965-07-06 1968-07-02 Dow Chemical Co Suspensions of synthetic polymer fibrous products containing acrylamide polymer and method of making a paper web therefrom
US3794557A (en) * 1969-03-26 1974-02-26 Johnson & Johnson Method of making isotropic fibrous webs containing textile length fibers
US3808095A (en) * 1971-05-13 1974-04-30 Johnson & Johnson Wet-formed nonwoven textile fabrics and methods of making the same
US3834983A (en) * 1973-03-15 1974-09-10 Dexter C & Sons Inc Process of forming wet laid tufted non-woven fibrous web from a viscous fibrous dispersion and product
US4200488A (en) * 1975-02-20 1980-04-29 International Paper Company Viscous dispersion for forming wet-laid, non-woven fabrics
US4487657A (en) * 1978-06-20 1984-12-11 Soci/e/ t/e/ Anonyme dite: Arjomari-Prioux Method for preparing a fibrous sheet
US4822452A (en) * 1987-04-06 1989-04-18 James River Corporation Of Virginia Manufacture of wet laid nonwoven webs
US4925528A (en) * 1987-04-06 1990-05-15 James River Corporation Of Virginia Manufacture of wetlaid nonwoven webs
US5133835A (en) * 1990-03-05 1992-07-28 International Paper Company Printable, high-strength, tear-resistant nonwoven material and related method of manufacture
US5403444A (en) * 1990-03-05 1995-04-04 International Paper Company Printable, high-strength, tear-resistant nonwoven material and related method of manufacture
US5238534A (en) * 1992-01-24 1993-08-24 James River Corporation Of Virginia Wetlaid nonwovens on high speed machines
US6100322A (en) * 1995-07-07 2000-08-08 Eka Chemicals Ab Process for the production of paper
US6379497B1 (en) * 1996-09-20 2002-04-30 Fort James Corporation Bulk enhanced paperboard and shaped products made therefrom
US6113741A (en) * 1996-12-06 2000-09-05 Eka Chemicals Ab Process for the production of paper
US6511579B1 (en) * 1998-06-12 2003-01-28 Fort James Corporation Method of making a paper web having a high internal void volume of secondary fibers and a product made by the process

Also Published As

Publication number Publication date
WO2005100689A1 (en) 2005-10-27
CN1942630A (en) 2007-04-04
FI20045132A (en) 2005-10-15
JP2007532792A (en) 2007-11-15
EP1735497A1 (en) 2006-12-27
FI20045132A0 (en) 2004-04-14
CA2561033A1 (en) 2005-10-27
WO2005100689A8 (en) 2006-04-20

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