EP1654420A2 - Procede pour introduire une charge dans une suspension de matiere fibreuse et dispositif pour la mise en oeuvre dudit procede - Google Patents

Procede pour introduire une charge dans une suspension de matiere fibreuse et dispositif pour la mise en oeuvre dudit procede

Info

Publication number
EP1654420A2
EP1654420A2 EP04766407A EP04766407A EP1654420A2 EP 1654420 A2 EP1654420 A2 EP 1654420A2 EP 04766407 A EP04766407 A EP 04766407A EP 04766407 A EP04766407 A EP 04766407A EP 1654420 A2 EP1654420 A2 EP 1654420A2
Authority
EP
European Patent Office
Prior art keywords
paper
suspension
fiber
carbon dioxide
calcium hydroxide
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.)
Withdrawn
Application number
EP04766407A
Other languages
German (de)
English (en)
Inventor
Klaus Doelle
Oliver LÜEDTKE
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.)
Voith Patent GmbH
Original Assignee
Voith Paper Patent GmbH
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 Voith Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1654420A2 publication Critical patent/EP1654420A2/fr
Withdrawn legal-status Critical Current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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
    • D21H17/675—Oxides, hydroxides or carbonates
    • 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
    • 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
    • D21H17/63—Inorganic compounds
    • D21H17/70—Inorganic compounds forming new compounds in situ, e.g. within the pulp or paper, by chemical reaction with other substances added separately
    • 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
    • D21H21/50—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 characterised by form
    • D21H21/52—Additives of definite length or shape
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/04—Addition to the pulp; After-treatment of added substances in the pulp
    • D21H23/06—Controlling the addition
    • D21H23/14—Controlling the addition by selecting point of addition or time of contact between components
    • D21H23/16—Addition before or during pulp beating or refining

Definitions

  • the invention relates to a method for loading a fiber suspension with calcium carbonate.
  • US Pat. No. 6,413,365 B1 describes a method in which fiber material is transported via a feed line together with calcium oxide and / or calcium hydroxide present in the suspension. From this, the fiber suspension is forwarded to a rotating distribution device. A reaction gas is introduced in a ring shape into the fiber suspension; as a result, calcium carbonate crystals are formed in the fiber suspension. The calcium carbonate crystals are distributed in the fiber stock suspension via the rotating distribution device. This process is known as the fiber loading process.
  • Cigarette paper is paper with a basis weight of 16 to 26 g / m 2 . It is often embossed with a molette and is said to be very thin, smoldering and tasteless. In addition, it should have good optical values with regard to the degree of whiteness. The smoldering ability is mostly influenced by achieved to leave a good-looking white ash. Cigarette paper is mostly made from linen or hemp fibers, cotton, sulfate pulp, paper machine waste and other fiber sources. The filler content of cigarette paper is between 5 and 40%, with 30% being regarded as the standard value.
  • Packaging papers and cardboards can be divided into three main classes: crate cardboard for packaging applications, crate cardboard for applications in the field of consumer packaging and special papers such as wallpaper, book spines, etc.
  • Packaging paper is usually produced as a multi-layer product with basis weights over 150 g / m 2 .
  • the degree of grinding varies from 600 to 50 CSF or 20 to 80 ° SR, based on the end product produced.
  • Sack papers require high porosity and high mechanical strength in order to meet the high requirements that arise from the rough treatment during the filling process and during the period of use, such as for cement bags.
  • the paper must be strong enough to absorb impacts and, accordingly, have a high energy absorption rate.
  • the sack paper must also be porous and air-permeable enough to ensure easy filling.
  • Sack papers are made, for example, as a product with basis weights between 70 and 80 g / m 2 from a long fiber kraft pulp and with a freeness between 600 to 425 CSF or 20 to 30 ° SR.
  • a medium degree of grinding as described above, is aimed for, which is usually achieved by high-consistency grinding, while low-consistency grinding is used in conventional paper types, for example graphic papers.
  • the result of the high-consistency grinding is a good bond between the fibers and a high porosity.
  • Sack kraft paper is predominantly made from bleached and unbleached fibers, and a filler content of 5 to 15% can be present in the sack paper produced.
  • Filter paper needs a high controlled porosity and pore distribution. It must have sufficient mechanical strength to counter the flow of the medium to be filtered.
  • Filter paper is produced with a basis weight of 12 to 1200 g / m 2 .
  • an air filter it is between 100 and 200 g / m 2 , with an oil and fuel filter between 50 and 80 g / m 2 , with a food filter up to 1000 g / m 2 , with a coffee filter up to 100 g / m 2 m 2 , for a tea bag between 12 and 20 g / m 2 and for a vacuum cleaner bag between 100 and 150 g / m 2 .
  • All filters are made from a variety of fibers such as cellulose fibers, bleached and unbleached fibers, kraft pulp, DIP (deinked) paper, recycled fibers, TMP (thermomechanical) paper, etc.
  • this object is achieved by a method with the following method steps:
  • DIP deinked paper
  • secondary fiber material bleached or unbleached pulp, wood pulp, bleached or unbleached sulfate pulp, manufacturing waste, linen, cotton, and / or hemp fibers (mainly cigarette paper) and / or any paper raw material that can be used on a paper machine.
  • the fiber loading technology allows filler, in particular calcium carbonate, to be precipitated directly in the stock preparation of a paper mill, which is evenly distributed and deposited on, in and between the paper fibers, as well as the treated pulp at the same time during the precipitation process of a fiber treatment in a grinding machine - pull.
  • the filler material used in the prior art is replaced by the filler material produced with the fiber loading combination process technology.
  • the field of application of the filler produced with the fiber loading combination process technology extends to the fields of paper production of all types of paper including cigarette papers, filter papers, sack kraft papers and cardboard and packaging papers that have a filler content between 1 and 60% and / or a white one Have a top layer with a filler content between 1 and 60%.
  • the loaded and produced paper types can be made from recycled paper, deinked paper (DIP), secondary fiber, bleached or unbleached Pulp, wood pulp, bleached or unbleached sulfate pulp, manufacturing waste, linen, cotton and / or hemp fibers (mainly for cigarette paper) and / or any paper raw material are produced on a paper machine, regardless of whether the end product contains filler.
  • DIP deinked paper
  • secondary fiber bleached or unbleached Pulp
  • wood pulp bleached or unbleached sulfate pulp
  • manufacturing waste linen, cotton and / or hemp fibers (mainly for cigarette paper) and / or any paper raw material are produced on a paper machine, regardless of whether the end product contains filler.
  • Fibrous fabricated using fiber loading combination process technology generally has a higher drainage property than fibrous fabric made by other processes; the improvement in drainage capacity is 5 to 100 ml CSF or 0.2 to 15 ° SR depending on the required degree of grinding.
  • the free filler can be switched on by means of an additional washing process before the grinding process, after the grinding process or after passing through the headbox or before feeding be removed to the paper machine.
  • This concerns the filler which is not deposited on or in the fibers and can be washed out accordingly.
  • the fibers themselves are filled with filler inside and out, so that the positive effects of fiber loading technology can be exploited.
  • the fiber loading technology can be used before or after the grinding process, depending on the requirements placed on the end product.
  • the fiber loading combination technology enables a higher degree of grinding to be achieved in an energy-efficient manner compared to the prior art, since up to 50% of the grinding energy can be saved; this has a positive influence in particular for all types of paper that go through a grinding process in their manufacture or have a high to very high degree of grinding, such as. B. FL cigarette papers, FL-B&P papers, FL sack kraft papers and FL filter paper.
  • FL cigarette papers with 100 to 25 CSF or 68 to 90 ° SR FL-B & P papers with 600 to 50 CSF or 20 to 80 ° SR, FL sack kraft papers with 600 to 425 CSF or 20 to 30 ° SR and FL filter papers with 600 to 350 CSF or 20 to 35 ° SR.
  • Another advantage of fiber loading for the paper types listed above is that calendering is provided for special applications and suppresses the so-called blackening by the use of fiber loading by the incorporation of FL particles in, around and on the fiber or is eliminated.
  • aqueous fiber material in particular aqueous paper material, of 0.1 to 20% consistency, preferably between 2 and 15%, is used as the starting material.
  • calcium hydroxide is preferably mixed as filler into the aqueous fiber material, in particular the paper fiber, this having a solids content of between 0.01 and 60%. According to the invention, it is also possible to use a starting material other than calcium hydroxide or calcium oxide to form the filler.
  • the calcium hydroxide is mixed in by means of a static mixer or by means of a feed hopper.
  • the carbon dioxide is advantageously mixed into a moist fiber suspension of 0.1 to 15% consistency in accordance with the reaction parameters. Calcium carbonate precipitates in a carbon dioxide gas atmosphere.
  • the grinding process is carried out in one apparatus, the crystallizer, simultaneously with the loading process (fiber loading); a grinding energy is used which is in the range between 0.1 and 300 kWh per tonne of dry paper; a short reaction time of the calcium hydroxide with the carbon dioxide is important.
  • the energy input ie the amount of heat or the heating of the paper suspension for the production of crystals in various forms is important for the invention.
  • aqueous paper stock with a paper content between 0.01 and 60% serves as the starting material.
  • a refiner, a disperser and / or a fluffer-FLPCC reactor is used as the reactor and / or static mixer, the fiber content, in particular the paper content, in a static mixer between 0, 01 and 15%; is between 2 and 40% for a refiner and disperser and between 15 and 60% for a fluffing FLPCC reactor.
  • the dilution water is supplied before, during or after the addition of carbon dioxide or calcium hydroxide or calcium oxide.
  • Calcium carbonate precipitates when carbon dioxide is mixed into a calcium hydroxide solution or suspension. Conversely, the precipitation reaction takes place in exactly the same way if calcium hydroxide is added to water under a carbon dioxide atmosphere.
  • Dilution water can be added before, during or after the addition of carbon dioxide or calcium hydroxide.
  • the process temperature is between -15 ° C and 120 ° C, in particular between 20 and 90 ° C.
  • r ombohedral, scalalenohedral and spherical crystals can be produced.
  • the crystals advantageously have dimensions between 0.05 and 5 ⁇ m, in particular between 0.3 and 2.5 ⁇ m.
  • Static and / or movable, in particular rotating, mixing elements can be used.
  • the process is advantageously carried out in a pressure range between 0 and 15 bar, in particular between 0 and 6 bar.
  • the pH value is advantageously between 6 and 10, in particular between 6.5 and 9.5.
  • the reaction time is advantageously between 0.01 minutes and 1 minute, in particular between 0.05 and 10 seconds.
  • a fiber suspension is transported in a device 1 (FIG.) In a pipeline system equipped with control valves 10, 12 for loading with calcium carbonate.
  • the control valve 10 is arranged in a line 14, via which the pipeline system is connected to a static mixer 16. This can be fed 18 dilution water via a valve.
  • the inflow of a suspension of calcium hydroxide is controlled via a further valve 22 installed in a line 20.
  • This is made available by a preparation device 24 in which solid calcium oxide or calcium hydroxide is introduced into water.
  • the preparation device 24 is supplied with water via a line with a valve 26.
  • the suspension generated in the preparation device is introduced into line 20 via a pump 28.
  • the fiber suspension mixed with calcium hydroxide and diluted thus flows out of the mixer 16 into a line 30 with a valve 32.
  • the line 32 feeds the suspension directly to a disperser 42 (crystallizer).
  • This is connected to a carbon dioxide reservoir 52 via a line 50 equipped with valves 44, 46 and a pump 48 for supplying carbon dioxide.
  • carbon dioxide is introduced into the disperser 42 in order to achieve the desired precipitation reaction of calcium
  • the calcium hydroxide can also be mixed in from a storage tank.
  • the line 50 is connected via a further valve 58 to a static mixer 60 which serves to add further carbon dioxide to the fibrous stock suspension flowing out of the disperser 42 via a line 64 provided with a valve 62.
  • the mixing container 68 can also be supplied via the valve 12 and a line 70 fiber suspension, which is not loaded with calcium hydroxide.
  • the fiber suspension flows out of the mixer 60 into a mixing container 66 (blend chest) which is equipped with a rotor 68 for mixing the fiber suspension.
  • the fiber suspension either flows directly from the mixing container 66 to a headbox of a paper machine or is subjected to a further mechanical treatment, for example in a refiner feed chest.
  • a refiner 80 can be introduced into the piping system to refine the fiber suspension by means of an additional grinding process. This is fed via a line 82 branching from the line 30, fiber suspension. From the refiner 80, the pulp suspension, which has been ground again, passes through a line 84 into the line 64 and from there, as described above, into the vessel 66.
  • the refiner 80 is supplied with carbon dioxide from the carbon dioxide storage container 52 via a line 86 branching off the line 50 and a static mixer 88 connecting it to the line 82.
  • the structure according to the invention for loading a fibrous suspension with calcium carbonate has the advantage over the devices known from the prior art that the use of machines for leveling the fibrous suspension, such as a screw press and a leveling machine for comparing the fibrous suspension (equalizing reacting) gate) does not apply.
  • the vessel 82 also takes over the grinding process, so that a considerably simpler structure of the stock preparation is made possible in comparison to the prior art. This grinding process also serves as a stirring process in order to store the calcium carbonate in the fibers by means of a shearing process.
  • calcium hydroxide hydrated lime, milk of lime
  • a solubility in water at 20 ° C. 1.65 g / l to 0.7 g / l at 100 ° C.
  • a solids content of 0 to 60% can be achieved, the suspension having a pH of a maximum of 12.6.
  • the actual amount of lime hydrate in the suspension is made up of the dissolved portion and the solids concentration.
  • CaO calcium oxide
  • the medium grain size range from 0.01 to 100 mm, in particular in the size range from 0.05 to 50 mm for the production of the hydrated lime by an extinguishing process.
  • the calcium oxide used is preferably produced by a soft fire process.
  • control valve 12 control valve 14 line 16 mixer 18 valve 20 line

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

L'invention concerne un procédé pour introduire du carbonate de calcium dans une suspension de matière fibreuse contenant des fibres de cellulose. Ce procédé comprend les étapes suivantes : introduction d'hydroxyde calcium, sous forme liquide ou déshydratée, ou d'oxyde de calcium dans la suspension de matière fibreuse ; introduction de gaz carbonique dans la suspension de matière fibreuse ; précipitation du carbone de calcium par le gaz carbonique ; et broyage de la suspension de matière fibreuse pendant l'opération d'introduction de la charge.
EP04766407A 2003-08-05 2004-08-03 Procede pour introduire une charge dans une suspension de matiere fibreuse et dispositif pour la mise en oeuvre dudit procede Withdrawn EP1654420A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10335751A DE10335751A1 (de) 2003-08-05 2003-08-05 Verfahren zum Beladen einer Faserstoffsuspension und Anordnung zur Durchführung des Verfahrens
PCT/EP2004/051701 WO2005014934A2 (fr) 2003-08-05 2004-08-03 Procede pour introduire une charge dans une suspension de matiere fibreuse et dispositif pour la mise en oeuvre dudit procede

Publications (1)

Publication Number Publication Date
EP1654420A2 true EP1654420A2 (fr) 2006-05-10

Family

ID=34111922

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04766407A Withdrawn EP1654420A2 (fr) 2003-08-05 2004-08-03 Procede pour introduire une charge dans une suspension de matiere fibreuse et dispositif pour la mise en oeuvre dudit procede

Country Status (7)

Country Link
US (1) US20070131361A1 (fr)
EP (1) EP1654420A2 (fr)
JP (1) JP2007501337A (fr)
CN (1) CN1823197A (fr)
BR (1) BRPI0413337A (fr)
DE (1) DE10335751A1 (fr)
WO (1) WO2005014934A2 (fr)

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DE102007051664A1 (de) * 2007-10-30 2009-05-07 Voith Patent Gmbh Verfahren zur Bildung von Calciumcarbonat in einer Faserstoffsuspension II
RU2405832C2 (ru) * 2008-12-29 2010-12-10 Дэвон Инвестмент Лимитед Способ подготовки древесного сырья для получения сахаров, установка для его осуществления и продукт
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PL2386683T3 (pl) 2010-04-27 2014-08-29 Omya Int Ag Sposób wytwarzania materiałów kompozytowych na bazie żelu
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WO2017064559A1 (fr) 2015-10-14 2017-04-20 Fiberlean Technologies Limited Matériau en feuille post-formable en 3d
CN106894281B (zh) * 2015-12-17 2019-03-22 上海东升新材料有限公司 一种造纸用轻钙包覆纤维填料及其制备方法和应用
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DE102018107944B3 (de) * 2018-04-04 2019-06-19 Delfortgroup Ag Verbessertes filterpapier, herstellungsverfahren und daraus gefertigter beutel

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Also Published As

Publication number Publication date
CN1823197A (zh) 2006-08-23
WO2005014934A3 (fr) 2005-06-09
DE10335751A1 (de) 2005-03-03
JP2007501337A (ja) 2007-01-25
BRPI0413337A (pt) 2006-10-10
US20070131361A1 (en) 2007-06-14
WO2005014934A2 (fr) 2005-02-17

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