US20200318287A1 - Method of providing a paper fibre composition - Google Patents

Method of providing a paper fibre composition Download PDF

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Publication number
US20200318287A1
US20200318287A1 US16/303,119 US201716303119A US2020318287A1 US 20200318287 A1 US20200318287 A1 US 20200318287A1 US 201716303119 A US201716303119 A US 201716303119A US 2020318287 A1 US2020318287 A1 US 2020318287A1
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Prior art keywords
bdt
range
vessel
paper
providing
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US16/303,119
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English (en)
Inventor
Jan Christer SANDBERG
Eva Birgitta SVENSSON RUNDLÖF
Claes Jonas Fredrik JOHNSSON
Erik Lennart Peter NELSSON
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Holmen AB
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Holmen AB
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Assigned to HOLMEN AB reassignment HOLMEN AB ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SANDBERG, JAN CHRISTER, JOHNSSON, Claes Jonas Fredrik, NELSSON, Erik Lennart Peter, SVENSSON RUNDLÖF, Eva Birgitta
Publication of US20200318287A1 publication Critical patent/US20200318287A1/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/02—Pretreatment of the raw materials by chemical or physical means
    • D21B1/021—Pretreatment of the raw materials by chemical or physical means by chemical means
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/04—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides
    • D21C3/06—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides sulfur dioxide; sulfurous acid; bisulfites sulfites
    • D21C3/12—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides sulfur dioxide; sulfurous acid; bisulfites sulfites sodium bisulfite
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/02—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
    • D21C3/022—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes in presence of S-containing compounds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/04—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides
    • D21C3/06—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides sulfur dioxide; sulfurous acid; bisulfites sulfites
    • 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
    • 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
    • D21H11/06—Sulfite or bisulfite pulp

Definitions

  • the present invention relates to a method according to claim 1 , a paper fibre composition according to claim 9 and a paper or paperboard or molded pulp according to claim 10 .
  • thermomechanical pulp In general mechanical treatment of wood chips such as for example the well-known thermomechanical pulp (TMP) process gives a high yield pulp. Also in general an entirely chemical pulp such as the KRAFT process gives a pulp with considerably lower yield but a product with better strength properties, than a mechanical pulp in general.
  • the objective of the present invention is to achieve a paper fibre composition that will give a strong paper product.
  • a further objective is to achieve a paper fibre composition that also gives a high yield that is in the range of 85-95%.
  • a further objective is to achieve a paper fibre composition that does not use excessive amounts of energy or chemicals.
  • a further objective is to achieve a paper fibre composition with high enough strength that can be used in products where normally only pure chemical pulps is considered.
  • At least one objective is achieved by a method of production of a paper fibre composition, comprising the steps of:
  • the above method is mechanical pulping process that yields stronger pulp compared to particular energy input for TMP or CTMP, and for particular chemical dosage in CMP or NSSC processes. Among other things it gives higher tensile and burst, and compression strength index.
  • step c) is controlled to be within the ranges of:
  • step c) is kept within the ranges of:
  • the method according to the above paper test sheets made from the paper fibre composition gives a Tensile index of 18-150 Nm/g, preferably of 25-150 Nm/g, even more preferred of 40-150 Nm/g.
  • the temperature t is comprised in the range 175-184° C.
  • the temperature t is comprised in the range 160-175° C.
  • This range of temperature is preferred as it makes it possible to reduce the chemicals needed and also the preheating time t, and still achieving a final product with even better strength properties.
  • a higher temperature requires a shorter preheating time t.
  • a paper or paperboard or a molded pulp comprising a paper fibre composition according to the above.
  • Paper or paperboard or molded pulp according to the above, wherein the Paper or paperboard or molded pulp comprises the paper fibre composition, but that the paper fibre composition is exposed to further treatment in order to change the properties, wherein said further treatment comprises further mechanical treatment, such that the paper fibre composition has a Tensile index that is higher than 50 Nm/g but lower than 150 Nm/g
  • FIG. 1 discloses the process equipment of the invention.
  • a vessel 1 is provided that is coupled to a fibre defibration device 2 .
  • the vessel 1 is a pressure vessel that is able to sustain pressures where a water suspension can reach temperatures of at least for the ranges that are discussed below that is at least 184° C., but preferably 190° C. or more such as 200° C.
  • the inlet 3 is of a suitable dimension for allowing wood chips to enter the vessel 1 .
  • the defibration device 2 can be constituted of a refiner, fiberizer, defibrator, mill or the like.
  • a preferred device is a refiner.
  • the present disclosure relates to a method for achieving a superior fibre composition that when applied in a product such as Paper or paperboard or molded pulp gives a comparably strong product as to what is previously known for a mechanical or chemithermomechanical processes.
  • Fibre composition means in general a pulp of fibres that originates from a fibre source.
  • the preferred fibre source is softwood, in general a larger share of spruce is preferred, if not being the only component. However it is possible to use pine and spruce in mixtures. Also a little amount of hardwood can be used for the present disclosure but the major part of the fibre composition is always has a softwood source. It should be understood that the present disclosure does not relate to a fibre composition made solely from hardwood or in amounts of hardwood that exceeds the content of softwood.
  • the present disclosure relates to a method with steps a-h).
  • the vessel 1 must be is a pressure vessel. This means that the vessel needs to be able to sustain pressures where a water suspension can reach temperatures of at least 184° C. or more as discussed above.
  • the vessel can be constituted in different ways. A vessel arranged for batch wise operation is of course possible also. That is a vessel that is loaded, closed and then opened and the content is passed on to the next step. However for the present disclosure a vessel that is part of a continuous process is the preferred.
  • the vessel 1 can be equipped with valves at the inlet 3 and the outlet 4 that can control the flow through the vessel 1 . It is of course known to the person skilled in the art how to achieve this, for example also incorporating a rotary feeder (valve) or a plug screw at the inlet.
  • the outlet 4 it is possible to implement a feeding screw.
  • the outlet 6 of the defibration device 2 can have a blow line valve. Pressure is controlled by the heat that can be supplied through a separate inlet 5 , by steam etc. in a known manner for the person skilled in the art.
  • the main inlet 3 is of a suitable dimension for allowing wood chips to enter the vessel 1 at a sufficient rate.
  • the precise configuration is known to the person skilled in the art and the given features of the inlet 3 , outlet 4 , and outlet 6 are only given as way of example.
  • “kg/bdt” means kilo grams of chemical substance per bone dry ton, i.e. dry amount of chemicals per dry fibre mass.
  • the lower limit of the Na 2 SO 3 can be altered to 15, 20, 25, 30, 35, 40, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 105, 110, 115, 120 kg/bdt
  • the corresponding upper limit can likewise be altered to 15, 20, 25, 30, 35, 40, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 105, 110, 115, 120 kg/bdt.
  • the NaOH combined with Na 2 SO 3 can have a lower limit altered to, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95 kg/bdt and an upper limit altered to 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65 70, 75, 80, 85, 90, 95 kg/bdt.
  • the NaHSO 3 can have a lower limit altered to 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 80, 85, 90, 95, 100 kg/bdt and an upper limit altered to 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 80, 85, 90, 95, 100 kg/bdt.
  • the NaOH combined with Na 2 SO 3 can have a lower limit altered to 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 80, 85, 90, 95, 100 kg/bdt and an upper limit altered to 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 80, 85, 90, 95, 100 kg/bdt
  • the chips is in general not needed to be added in the order of after the chemicals.
  • the chips can be added before or at the same time as the chemicals of step b).
  • the chemicals can also be added to the chips prior to the chip entering the vessel of step a).
  • Chips are in general of the ordinary size known for the person skilled in the art.
  • the chips may have been pre-treated with steam before entering the vessel.
  • the lower limit of the range of T could be 161° C., 162° C., 163° C., 164° C., 165° C.
  • the upper limit of the range of T could be 183° C., 182° C., 181° C., 180° C., 179° C., 178° C., 177 C°, 176° C., 175° C., 174° C., 173° C., 172° C., 171° C., 169° C., 168° C., 167° C. or 166° C.
  • the retention time is crucial to achieve the desired objective of the invention. In the narrow range of 2-27 min there objective of the invention is reached. In order to keep the yield high the retention time t cannot be extended outside the given range.
  • the control of the retention time is easily achieved by for example controlling the flow through the vessel 1 .
  • the lower limit of the retention time t can be altered to 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26 min.
  • the upper limit of the retention time t can be altered to, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26 min.
  • the defibriation device being a refiner, mill, defibrator, fiberizer, or the like
  • the core of the invention is to be able to achieve a strong paper product that can compete with lower yield chemical pulps in terms of their strength properties. Therefore the chips after treatment with chemicals and heat are defibrated and refined mechanically. The yield is kept high as most of the lignin content of the original material is not dissolved entirely.
  • a refiner is preferred, however the means for achieving the mechanical treatment can be other means and it is desired to keep the temperature, i.e. pressure within the range of step 160-184° C.
  • the energy consumption can have a lower range value of 100, 125, 150, 175, 200, 225, 250, 275, 300, 325, 350, 375, 400, 425, 450, 475, 500, 525, 550, 575, 600, 625, 650, 675, 700, 725, 750 kWh/bdt.
  • the energy consumption can have a high range value of 100, 125, 150, 175, 200, 225, 250, 275, 300, 325, 350, 375, 400, 425, 450, 475, 500, 525, 550, 575, 600, 625, 650, 675, 700, 725, 750, 775, 800, 825, 850, 875, 900, 925, 950, 975 kWh/bdt
  • step b) administration of chemicals step b) can be made together with the wood chips step c) or the chips can be added before the chemicals.
  • paper test sheets In order to achieve the appropriate product it is possible to measure the paper fibre composition properties by making paper test sheets. These sheets should provide a tensile index of 18-150 Nm/g but preferably 25 or 40-150 Nm/g which indicates really good strength properties.
  • This further treatment step further adds refining in the range of 1-2500 kWh/bdt, to said paper fibre composition.
  • step i) By adding step i) a final product with excellent strength properties is achieved.
  • the added energy consumption in the refining can have the following lower limit
  • the added energy consumption in the refining can have the following higher limit 100, 150, 200, 250, 300, 350, 400, 450, 500, 550, 600, 650, 700, 750, 800, 850, 900, 950, 1000, 1050, 1100, 1150, 1200, 1250, 1300, 1350, 1400, 1450, 1500, 1550, 1600, 1650, 1700, 1750, 1800, 1850, 1900, 1950, 2000, 2050, 2100, 2150, 2200, 2250, 2300, 2350, 2400, 2450 kwh/bdt.
  • Chips were preheated with steam to 90° C. and was fed continuously through a plug-screw feeder into an impregnator located inside the pressurized reaction vessel. An impregnation solution was simultaneously added to the impregnator containing water sodium bisulfite and sodium hydroxide. The retention time in the reaction vessel was controlled by the level of chips and the temperature was controlled by addition of 12 bar steam. After retention in the reaction vessel, chips were directly fed to the refiner where chips were defibrated with varying specific energies. Pulps were collected from the blow line of the refiner.
  • the defibration device used was a OVP 20′′ Sunds defibrator
  • the energy input was 260 kWh/bdt
  • Tensile index was measured by: ISO5269-2 (Rapid Köthen handsheets), ISO1924-2 (Tensile index measurement)
  • Example 1 was repeated with the method, same equipment and fibre source in the following examples 2-7.
  • thermomechanicalpulp has a much shorter fibre length in the order of 1.4 mm at a corresponding Tensile index as in examples 1-7 above.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
US16/303,119 2016-05-23 2017-05-17 Method of providing a paper fibre composition Abandoned US20200318287A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE1650710-5 2016-05-23
SE1650710A SE540961C2 (en) 2016-05-23 2016-05-23 Method of providing a paper fibre composition by combining chemical and mechanical pulping
PCT/SE2017/050514 WO2017204723A1 (fr) 2016-05-23 2017-05-17 Procédé de fourniture d'une composition de fibres de papier

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US20200318287A1 true US20200318287A1 (en) 2020-10-08

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US16/303,119 Abandoned US20200318287A1 (en) 2016-05-23 2017-05-17 Method of providing a paper fibre composition

Country Status (5)

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US (1) US20200318287A1 (fr)
EP (1) EP3464712A1 (fr)
CA (1) CA3025476A1 (fr)
SE (1) SE540961C2 (fr)
WO (1) WO2017204723A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4219827A1 (fr) * 2019-11-07 2023-08-02 Ahlstrom Oyj Papier compostable à base de cellulose pour barrière aux gaz dans un matériau d'emballage
SE546114C2 (en) * 2020-10-02 2024-05-28 Holmen Ab High yield containerboard and the production thereof

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2323194A (en) 1940-08-07 1943-06-29 Beveridge James Brookes Apparatus for the production of pulp from cellulosic material
US4486267A (en) * 1983-11-14 1984-12-04 Mead Corporation Chemithermomechanical pulping process employing separate alkali and sulfite treatments
SE8601477L (sv) * 1986-04-02 1987-10-03 Sunds Defibrator Sett for behandling av mekanisk massa
SE461103B (sv) * 1988-05-06 1990-01-08 Svenska Traeforskningsinst Framstaellning av mekanisk och kemimekanisk massa i tvaa steg
SE9402101L (sv) * 1994-06-15 1995-12-16 Moelnlycke Ab Lättavvattnad, bulkig, kemimekanisk massa med låg spet- och finmaterialhalt
US8753476B2 (en) * 2010-10-06 2014-06-17 Andritz Technology And Asset Management Gmbh Methods for producing high-freeness pulp

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Publication number Publication date
SE540961C2 (en) 2019-01-29
CA3025476A1 (fr) 2017-11-30
WO2017204723A1 (fr) 2017-11-30
EP3464712A1 (fr) 2019-04-10
SE1650710A1 (en) 2017-11-24

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