EP2142348B1 - Procédé de préparation de particules de bois blanchi et de matériaux de bois clairs à blancs - Google Patents

Procédé de préparation de particules de bois blanchi et de matériaux de bois clairs à blancs Download PDF

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Publication number
EP2142348B1
EP2142348B1 EP20080749657 EP08749657A EP2142348B1 EP 2142348 B1 EP2142348 B1 EP 2142348B1 EP 20080749657 EP20080749657 EP 20080749657 EP 08749657 A EP08749657 A EP 08749657A EP 2142348 B1 EP2142348 B1 EP 2142348B1
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European Patent Office
Prior art keywords
wood
cellulose
weight
bleach
production
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EP20080749657
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German (de)
English (en)
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EP2142348A1 (fr
Inventor
Dieter SCHÖNHABER
Stefan Erren
Katerina Stieglitz
Eberhard Beckmann
Andres Carlos Garcia Espino
Norbert Jäger
Juliane Krüsemann
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BASF SE
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BASF SE
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Priority to PL08749657T priority Critical patent/PL2142348T3/pl
Priority to EP20080749657 priority patent/EP2142348B1/fr
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Classifications

    • 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
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J1/00—Fibreboard
    • 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
    • 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
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • 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
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1084—Bleaching ; Apparatus therefor with reducing 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
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1084—Bleaching ; Apparatus therefor with reducing compounds
    • D21C9/1089—Bleaching ; Apparatus therefor with reducing compounds with dithionites
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249924—Noninterengaged fiber-containing paper-free web or sheet which is not of specified porosity
    • Y10T428/249925—Fiber-containing wood product [e.g., hardboard, lumber, or wood board, etc.]

Definitions

  • the present invention relates to a process for producing bleached wood particles and to a process for producing light to white wood materials made from the bleached wood particles.
  • MDF medium density fibreboard
  • HDF high density fibreboard
  • MDF and HDF boards can be processed like conventional chipboard. Due to their uniform structure, they are also suitable for the production of profiled parts and are therefore becoming increasingly popular in furniture construction. Thus, for example, furnishings for rooms and for decorative purposes (for example, in trade fair construction), but also higher-quality furniture made from these plates and then, in order to preserve the wood-like structure visible, only colorless or coated with overlay.
  • wood-based panels are of particular interest.
  • the light inherent color is achieved by the use of bleached wood fibers and optionally the addition of a white pigment and / or an optical brightener.
  • the coloring constituents of the wood particles are destroyed or rendered ineffective by oxidizing and / or reducing chemicals.
  • the wood fibers are usually bleached in bleach towers in countercurrent or during the processing of the wood chips usually used as raw material in the preheater or in the digester.
  • the plasticized woodchips are subsequently defibrated in the refiner and the fibers are blown out of the refiner via the so-called blowline.
  • both oxidatively acting substances such as hydrogen peroxide and salts of inorganic and organic peracids (for example, percarbonate) are used as well as reductive substances such as sulfinic acids, sulfites and dithionites.
  • the bleaching of the wood fibers in bleaching towers is an additional process step in their production, which increases the expenditure on equipment. It is therefore useful to lay the bleaching of wood fibers in the process of their production, as in the WO 2006/042651 A1 is described.
  • the bleaching agents must be carefully selected since bleaches incorporated in the process, as well as their reaction and degradation products, generally remain on the wood fibers and the product steps made therefrom.
  • the bleaching agents must be particularly suitable, they must have appropriate stabilities, redox potentials and reaction times. You should also take any adverse consequences.
  • hydrogen peroxide is unsuitable as a bleaching agent because it must be worked in alkaline, leading to swelling of the wood fiber and later yellowing, which is undesirable in the final products.
  • oxygen and ozone are used in the bleaching of pulp, bleaching of lignin-containing wood requires long reaction times. Sulphites and many organic bleaches have under the given conditions too low redox potentials, are in this case too weak as a bleaching agent.
  • sodium dithionite is highly reactive, it decomposes at temperatures above 80 to 100 ° C. The resulting and remaining in the wood fibers degradation products include hydrogen sulfide and thiosulfate, which are noticeable in the final product as an unpleasant odor.
  • the object of the present invention is therefore an alternative process for producing bleached wood particles, in which neither unwanted or disadvantageous compounds originating from the bleaching agent remain on or in the wood particles, with which a good bleaching action is achieved and which does not require extensive apparatus Processes for the production of wood fibers can be integrated.
  • the object is achieved by a method for producing bleached wood particles according to the present claim 1.
  • the wood particles are carried out in step b) via a blowline.
  • the comminuted, cellulose-containing raw materials are pretreated in a digester before they are used in step a) of the process according to the invention.
  • the wood particles are carried out in step b) via a blowline.
  • the comminuted, cellulose-containing raw materials are pretreated in a digester before they are used in step a) of the process according to the invention.
  • the process according to the invention for the production of bleached wood particles can be incorporated into existing processes for the production of wood particles without great expenditure on apparatus.
  • the bleach compositions to be used according to the invention have the great advantage of not being broken down prematurely in the refiner or in the blowline and, despite the very short to short residence times of the wood particles, which are in the range of minutes in the case of the refiner in the range of milliseconds and in the blowline To develop good to good bleaching effect, without leaving behind harmful or even harmful compounds on or in the wood particles.
  • the wood materials produced by the process according to the invention surprisingly have a greater brightness compared to wood materials produced from wood particles bleached in the digester or preheater.
  • wood particles are understood to mean small-particle, cellulose-containing particles. These include, for example, fibers and chips made of wood and other cellulosic materials.
  • all fibrous materials to be obtained from plants can serve as the base material for the wood particles and wood materials according to the invention.
  • wood is usually used as a raw material, but it is also possible to obtain suitable cellulosic particles from palms as well as from annual plants such as begasse or straw.
  • Another source is agricultural waste products.
  • Preferred base materials are light wood species, especially spruce or pine, but darker woods such as beech or eucalyptus can also be used.
  • the cellulose-containing raw materials are first comminuted and optionally washed. This may possibly be followed by a pretreatment. For example, wood is first chopped up, washed and the water-moist pieces of wood (wood chips) preheated first.
  • the comminuted, cellulosic raw materials are pretreated in a so-called digester. Usually, this is carried out at a pressure of 2 to 5 bar and a temperature of 100 to 180 ° C. The exact temperatures and pressures depend on the raw materials used. Lower annual temperatures are usually lower enough for digestion of annual plants than for the digestion of multi-annual plants such as wood.
  • step a) the optionally pretreated, comminuted, cellulose-containing raw materials are transferred to a so-called refiner and ground there to form wood particles.
  • a refiner is usually a grinding unit with rotating and possibly fixed knives / discs for grinding fibrous materials and preferably consists of two radially-provided with metal discs which are close to each other. One of these two discs can move, but both can rotate in opposite directions. Usually, the refiner works with overpressure.
  • the grinding of optionally pretreated, comminuted, cellulose-containing raw materials can also be carried out in other devices suitable for this purpose.
  • step b) the wood particles are carried out of the refiner.
  • the wood particles are blown out of the refiner by a so-called blowline.
  • a blowline is usually understood a blow pipe, through which the wood particles are carried out by the pressure prevailing in the refiner overpressure.
  • the wood particles are bleached in the refiner or when the wood particles are removed from the refiner by adding a bleach composition containing at least one bleach. If the wood particles are carried out via a blowline according to a preferred embodiment, the addition of the bleaching composition can take place in the refiner or in the blowline.
  • the wood particles are bleached reductively.
  • reducing sulfur compounds such as dithionites, disulfites, sulfites or sulfur dioxide
  • sulfinic acids and their salts in particular the alkali metal salts and especially the sodium salts and hydroxycarboxylic acids such as citric acid and malic acid are suitable.
  • bleaching compositions containing at least one bleaching agent selected from the group of stabilized sulfites and sulfinic acids and their salts are used hydroxymethylsulfinic acid being preferred as the sulfinic acid.
  • the stabilization of the sulfites is carried out by the addition of basic salts.
  • the bleaching composition may contain, in addition to the at least one bleaching agent and optionally its stabilizers, further auxiliaries such as complexing agents, for example EDTA or polyphosphates.
  • the alkali metal salts can be used, preferred are sodium and potassium hydrosulfite, particularly preferred is sodium hydrosulfite.
  • the alkali metal salts can be used, preferred are sodium and potassium sulfite, particularly preferably sodium sulfite.
  • the basic salts can be selected from the group of carbonates and bicarbonates, the alkali metal carbonates are preferred, sodium carbonate is particularly preferred.
  • Tripolyphosphatsalze potassium and sodium tripolyphosphate can be used, preferred is sodium tripolyphosphate.
  • the bleaching composition is added to the cellulose-containing raw material or the wood particles during their production.
  • the addition takes place in the refiner or when carrying out the wood particles.
  • the wood particles are carried out via a blowline.
  • the bleach composition containing at least one bleach is in this embodiment in the refiner or in the blowline, preferably added in the refiner or at the beginning of the blowline, particularly preferably in the refiner.
  • the bleaching composition is metered so that the amount of bleaching agent is from 0.1 to 6 wt .-%, preferably 0.5 to 5 wt .-% and particularly preferably 1 to 3 wt .-% of atro (absolutely dry) fibers.
  • the bleaching compositions are usually added to the wood particles in the refiner or in the blowline in the form of aqueous solutions, the concentration of bleaching composition in the aqueous solution being from 1 to 25% by weight, preferably from 5 to 20% by weight and more preferably from 10 to 15 wt .-% is enough.
  • the bleached wood particles can be further processed directly, they can also be dried and further processed in a dried state. Also, the dried wood particles can be stored before further processing.
  • a preferred possibility for further processing of the bleached wood particles is the production of wood-based materials, in particular directly after the bleaching step.
  • the wood particles are carried out in step b) via a blowline.
  • the comminuted, cellulose-containing raw materials are pretreated in a digester before they are used in step a) of the process according to the invention.
  • the wood-based materials produced according to the invention may be MDF, HDF, chipboard or OSB boards. Preference is given to MDF and HDF boards, particularly preferred MDF boards.
  • MDF, HDF, OSB and chipboard are also referred to as wood-based panels. They are preferably prepared by gluing coated fibers or shavings into mats, optionally cold precompressed and pressed in heated presses at temperatures of 170 to 240 ° C to plates.
  • the binder used as the sizing agent is usually urea-formaldehyde resins partially reinforced with melamine, urea-melamine-formaldehyde resins, melamine-formaldehyde resins, phenol-melamine resins and phenol-formaldehyde resins.
  • urea-melamine-formaldehyde resins partially reinforced with melamine
  • urea-melamine-formaldehyde resins melamine-formaldehyde resins
  • phenol-melamine resins phenol-formaldehyde resins
  • phenol-formaldehyde resins phenol-formaldehyde resins.
  • the wood particles can according to the invention directly, d. H. still wet, glued in the blowline.
  • Another possible method for gluing is in the so-called dry gluing, while the dried wood particles are sprayed with glue.
  • wood particles are glued in the blowline, they then pass through a dryer in which they are dried to moistures of 8 to 15 wt .-%.
  • the glued and optionally dried wood particles are then poured into mats, optionally precompressed cold and pressed in heated presses at temperatures of 170 to 240 ° C to plates.
  • the further processing of the bleached wood particles takes place immediately after the bleaching.
  • the bleached wood particles are bleached after bleaching according to the invention by adding a bleach composition in the refiner or at the beginning of the blowline in the blowline, then dried in a dryer to a residual moisture content of 8 to 15 wt .-% and further processed into wood materials.
  • At least one white pigment is added to the wood particles during the production process. This results in a mass coloration of the resulting wood material.
  • white pigment encompasses both inorganic pigments such as titanium dioxide (rutile, CI Pigment White 6), calcium carbonate and calcium / magnesium mixed carbonates (eg dolomite), zinc oxide, zinc sulfite, lithopone and sodium aluminum silicates, as well as white-dyeing, strongly light-scattering Plastic emulsions and dispersions.
  • inorganic white pigments are preferred, and titanium dioxide is particularly preferred. It is also possible to use mixtures of white pigments.
  • the white pigments are preferably used in the form of aqueous dispersions in which they are finely divided, since they can be introduced directly into the production process of the wood materials via the blowline, separately from or together with the glue.
  • These pigment dispersions may contain other customary auxiliaries, in particular wetting and dispersing agents, defoamers and biocides, anti-settling agents, water retention agents and rheology modifiers and are preferably prepared by wet milling of all components, for example in a stirred ball mill.
  • concentrations of the white pigment in the finished wood material are usually at 0.5 to 15% per atro wood fiber, preferably at 1 to 6% per atro wood fiber.
  • a further increase in whiteness can be achieved by the addition of optical brighteners, which compensate for their bluish fluorescence (complementary color) graying and yellowing.
  • optical brighteners can be introduced in the form of aqueous dispersions or solutions separately or together with the glue in the production process for the wood-based materials.
  • the concentration in the finished wood material is generally from 0.01 to 1% per atro wood fiber, preferably 0.08 to 0.2% per atro wood fiber.
  • wood-based materials of the invention in which both at least one white pigment and at least one optical brightener are combined, since the individual contributions are potentiated by synergy effects to a maximum overall degree of whiteness.
  • any resulting from the inventive measures changes in the physical properties of the pressed wood-based panel can be controlled by selecting the glue quality and amount of glue.
  • the selection of the corresponding parameters is familiar to the person skilled in the art.
  • Another object of the present invention are bleached wood particles, prepared by the process according to the invention for the production of bleached wood particles.
  • Another object of the present invention are light to white wood materials, prepared according to one of the inventive method described above.
  • the present invention will be illustrated by the production of MDF boards in Examples.
  • the MDF production process is carried out as usual with a throughput of 28 to 30 kg / h, the wood chips are shredded by the refiner, the fibers obtained are discharged through the blowline and continuously glued in the blowline with the glue batch listed in the examples.
  • the glued wood fibers are dried in the subsequent continuous dryer to a residual moisture content of about 9 wt .-% and then poured discontinuously to a mat, cold precompressed and at 190 ° C with a pressing time factor of 15 s / 2mm to a 16 mm thick plate pressed.
  • Wood chips from spruce wood were used as the cellulosic raw material.
  • the fibers were fiberized without the addition of a bleach composition and were continuously glued in the blowline with the glue formulation listed in Table 1.
  • Table 1 glue batch Urea-melamine-formaldehyde resin, 66.5% by weight in water 100.0 parts by weight Paraffin dispersion, 60% strength by weight in water 4.0 parts by weight water 33.8 parts by weight Solid resin content of the liquor 48% Solid resin / atro fibers 14% Fleet on 100 kg of atro fibers 29.2 kg
  • Spruce wood chips are used during the MDF production process in the refiner with a 15% strength by weight aqueous hydrosulfite solution, corresponding to 5% by weight. Bleach per atro fibers, offset. In the blowline, the fibers are glued with the glue batch listed in Table 1.
  • Spruce wood chips are added during the MDF production process in the refiner with a 15 wt .-% aqueous solution of bleach compositions listed in Table 3 1a to 1c, corresponding to 5 wt .-% bleach per atro fibers.
  • the resulting fibers are glued continuously in the blowline with the glue batch listed in Table 1.
  • An MDF board was prepared analogously to the procedure described in Example 1, but without the addition of the bleach-containing compositions.
  • Table 3 the obtained whiteness of Examples 1 a, 1 b and 1 c, expressed in the brightness difference .DELTA.L based on the comparative example V3 is listed as a standard.
  • Table 3 Bleaching compositions 1a to 1c example 1a 1b 1c V3 Hydrosulfite [% by weight] 85 80 70 - Sodium sulfite [% by weight] 7.5 12 13 - Soda (Na 2 CO 3 ) [% by weight] 7.5 5 14 - Sodium tripolyphosphate [% by weight] - 3 1 - .DELTA.L 5.1 6.7 5.0 -
  • Wood chips from spruce wood were fiberized in the refiner and treated with a 15 wt .-% aqueous solution of the bleaching composition listed under Example 1b, corresponding to 5 wt .-% bleach per atro fibers. Subsequently, the fibers in the blowline were glued with the glue batch listed in Table 1. The glued fibers were then pressed into an MDF board.
  • An MDF plate was prepared analogously to the procedure described in Example 2, but without the addition of a bleach-containing composition.
  • Table 4 shows the whiteness achieved, expressed in the brightness difference ⁇ L, based on the comparative example V4 as standard.
  • Wood chips from spruce and beech wood were added in the refiner with a 15 wt .-% aqueous bleach composition according to Example 1b, corresponding to 5% bleach atro fibers.
  • the fibers were in the blowline continuously with the in table 5 glued, containing the white pigment containing titanium dioxide glue batch, dried and pressed into MDF boards.
  • an MDF board was prepared.
  • a glue formulation according to Table 5 was used, with the titanium dioxide preparation being replaced by the same amount of water.
  • Table 6 the obtained whiteness, expressed in the brightness difference .DELTA.L, based on the comparative example V5 is listed as a standard. Table 6 example .DELTA.L 3 4.7 V5 -
  • An MDF board was prepared analogously to the procedure described in Example 5, but using the glue formulation listed in Table 8, which contains a combination of the white pigment titanium dioxide and optical brightener.
  • Table 8 glue batch Urea-melamine-formaldehyde resin, 66.5% by weight in water 100.0 parts by weight Paraffin dispersion, 60% strength by weight in water 4.0 parts by weight Titanium dioxide preparation, 50 wt .-% in water, containing 2 wt .-% of a commercial optical brightener 47.5 parts by weight Solid resin content of the liquor 44% Solid resin / atro fibers 14% Titanium dioxide / atro fibers 5% optical brightener / atro fibers 0.2% Fleet on 100 kg of atro fibers 31.8 kg
  • An MDF board was prepared analogously to the procedure described in Example 4, but without the addition of the bleach-containing composition in the refiner.
  • Wood chips from spruce wood were treated in the refiner with a 15% strength by weight aqueous solution of hydroxymethanesulfinic acid, corresponding to 5% bleach-free fibers.
  • the bleached fibers were glued with the glue formulation listed in Table 1.
  • Table 10 the obtained whiteness, expressed in the brightness difference ⁇ L, based on the comparative example V7 as a standard, is listed.
  • Poplar wood chips were treated during the MDF production process in the refiner with a 15% by weight aqueous bleaching composition according to Example 1b, corresponding to 5% bleach per atro fibers.
  • the resulting fibers were coated in the blowline continuously with the glue formulation listed in Table 1.
  • An MDF board was prepared analogously to the procedure described in Example 8, but without the addition of the bleach-containing composition.
  • Table 11 shows the whiteness achieved, expressed in the difference in brightness ⁇ L, based on the comparative example V8 as standard.
  • Spruce wood chips were treated during the MDF production process in the refiner with a solution containing 15% by weight aqueous bleach according to Example 1b, corresponding to 5% bleach per atro fibers.
  • the resulting fibers were glued in the blowline with the glue formulation listed in Table 1.
  • the glued wood fibers were dried and pressed into a plate.
  • the plate was then exposed for 24 hours in a Sun tester and the whiteness expressed in terms of the difference in brightness ⁇ L with respect to the unexposed plate was measured.
  • Table 12 lists the results. Table 12 example .DELTA.L 9 exposed - 2 9 unexposed -
  • Spruce wood chips were treated during the MDF production process in the refiner with a 15% by weight aqueous hydrosulfite solution corresponding to 5% bleach per atro fibers.
  • the resulting fibers were coated in the blowline continuously with the glue formulation listed in Table 1.
  • the dried glued wood fibers were pressed into MDF boards.
  • Table 13 shows the whiteness achieved. example .DELTA.L V9 exposed - 4,5 V9 unexposed -
  • Wood chips from spruce wood were added during the MDF production process in the refiner with a 15 wt .-% aqueous solution containing bleach composition according to Example 1b, corresponding to 5% bleach per atro fibers.
  • the resulting fibers were coated in the blowline continuously with the glue formulation listed in Table 1.
  • an MDF board was prepared.
  • Table 14 shows the whiteness achieved, expressed in the difference in brightness ⁇ L, transverse tensile strength, swelling, and the sensorially determined odor of the plates, each referred to as comparative example V10 as standard.
  • the transverse tensile strength of the resulting MDF boards was measured according to DIN 319, particleboard and fiberboard, determination of tensile strength, perpendicular to the board plane.
  • the swelling was measured in accordance with DIN EN 317, particleboard and fiberboard, determination of thickness swelling and water absorption.
  • Table 14 example .DELTA.L Transverse tensile strength [N / mm 2 ] Swelling 24 h [%] odor 10 6.3 0.85 6.67 woody V10 - 1.04 6.33 woody

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Paper (AREA)
  • Detergent Compositions (AREA)
  • Disintegrating Or Milling (AREA)

Claims (11)

  1. Procédé de fabrication de particules cellulosiques blanchies comprenant les étapes suivantes :
    a) la pulvérisation de matières premières cellulosiques broyées éventuellement prétraitées dans un raffineur en particules cellulosiques et
    b) le déchargement des particules cellulosiques du raffineur,
    les particules cellulosiques étant blanchies à l'étape a) ou à l'étape b) par ajout d'une composition d'agent de blanchiment ou d'au moins un agent de blanchiment, caractérisé en ce que la composition d'agent de blanchiment contient
    i) 60 à 95 % en poids d'un ou de plusieurs sels d'hydrosulfite,
    ii) 1 à 25 % en poids d'un ou de plusieurs sels de sulfite,
    iii) 1 à 10 % en poids d'un ou de plusieurs sels basiques,
    et l'agent de blanchiment est choisi dans le groupe des acides sulfiniques et leurs sels et des sulfites stabilisés.
  2. Procédé selon la revendication 1, caractérisé en ce que la composition d'agent de blanchiment contient jusqu'à 10 % en poids d'un ou de plusieurs sels de tripolyphosphate.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que les particules cellulosiques sont déchargées par une installation de soufflage à l'étape b).
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que les matières premières cellulosiques broyées sont prétraitées dans un cuiseur avant d'être utilisées à l'étape a).
  5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que du bois, de la bagasse ou de la paille sont utilisés en tant que matière première pour les particules cellulosiques.
  6. Procédé de fabrication de matériaux à base de bois clairs à blancs, comprenant les étapes suivantes :
    a) la pulvérisation de matières premières cellulosiques broyées éventuellement prétraitées dans un raffineur en particules cellulosiques et
    b) le déchargement des particules cellulosiques du raffineur, et
    c) la transformation des particules cellulosiques en matériaux à base de bois clairs à blancs,
    les particules cellulosiques étant blanchies à l'étape a) ou à l'étape b) par ajout d'une composition d'agent de blanchiment ou d'au moins un agent de blanchiment, caractérisé en ce que la composition d'agent de blanchiment contient
    i) 60 à 95 % en poids d'un ou de plusieurs sels d'hydrosulfite,
    ii) 1 à 25 % en poids d'un ou de plusieurs sels de sulfite,
    iii) 1 à 10 % en poids d'un ou de plusieurs sels basiques,
    et l'agent de blanchiment est choisi dans le groupe des acides sulfiniques et leurs sels et des sulfites stabilisés.
  7. Procédé selon la revendication 6, caractérisé en ce que l'étape c) suit directement l'étape b).
  8. Procédé selon la revendication 6 ou 7, caractérisé en ce qu'au moins un pigment blanc est ajouté lors de la fabrication des matériaux à base de bois clairs à blancs.
  9. Procédé selon l'une quelconque des revendications 6 à 8, caractérisé en ce qu'au moins un azurant optique est ajouté lors de la fabrication des matériaux à base de bois clairs à blancs.
  10. Procédé selon l'une quelconque des revendications 6 à 9, caractérisé en ce qu'au moins un pigment blanc et au moins un azurant optique sont ajoutés lors de la fabrication des matériaux à base de bois clairs à blancs.
  11. Procédé selon l'une quelconque des revendications 6 à 10, caractérisé en ce que les matériaux à base de bois clairs à blancs sont des panneaux MDF, HDF, OSB et de particules.
EP20080749657 2007-04-24 2008-04-23 Procédé de préparation de particules de bois blanchi et de matériaux de bois clairs à blancs Active EP2142348B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL08749657T PL2142348T3 (pl) 2007-04-24 2008-04-23 Sposób wytwarzania bielonych cząstek drewna i tworzyw drzewnych o zabarwieniu od jasnego do białego
EP20080749657 EP2142348B1 (fr) 2007-04-24 2008-04-23 Procédé de préparation de particules de bois blanchi et de matériaux de bois clairs à blancs

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP07106804 2007-04-24
PCT/EP2008/054879 WO2008129048A1 (fr) 2007-04-24 2008-04-23 Procédé de préparation de particules de bois blanchi et de matériaux de bois clairs à blancs
EP20080749657 EP2142348B1 (fr) 2007-04-24 2008-04-23 Procédé de préparation de particules de bois blanchi et de matériaux de bois clairs à blancs

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EP2142348A1 EP2142348A1 (fr) 2010-01-13
EP2142348B1 true EP2142348B1 (fr) 2013-12-25

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US (1) US8784607B2 (fr)
EP (1) EP2142348B1 (fr)
JP (1) JP5371955B2 (fr)
CN (1) CN101678557B (fr)
BR (1) BRPI0810574B1 (fr)
CL (1) CL2008001199A1 (fr)
ES (1) ES2447870T3 (fr)
PL (1) PL2142348T3 (fr)
WO (1) WO2008129048A1 (fr)

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DE102022134621A1 (de) 2022-12-22 2024-06-27 Siempelkamp Maschinen- Und Anlagenbau Gmbh Verfahren zum Herstellen von Partikeln für die Produktion einer Werkstoffplatte sowie Werkstoffplatte

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DE102007055415C5 (de) * 2007-11-19 2018-11-29 SWISS KRONO Tec AG Verfahren zur Verminderung der Emission von gesättigten und ungesättigten Aldehyden aus Holzwerkstoffen
DE102008063020A1 (de) 2008-12-23 2010-06-24 Basf Se Overlay mit Effekten
KR101207845B1 (ko) * 2010-11-05 2012-12-04 (주)지바이오텍 표백목분, 표백목분의 제조방법, 그것을 이용한 종이 및 그 제조방법
KR101178727B1 (ko) * 2011-12-01 2012-08-31 한솔제지주식회사 표백 목분을 함유하는 종이 및 이의 제조 방법
US10569452B2 (en) 2013-06-17 2020-02-25 Valinge Innovation Ab Method of manufacturing a wood-based board
EP2924166A1 (fr) * 2014-03-25 2015-09-30 Basf Se Procédé de fabrication de fibre de bois blanchie
PL3354430T3 (pl) * 2017-01-31 2020-01-31 SWISS KRONO Tec AG Sposób wytwarzania materiału płyty OSB
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CN110951274A (zh) * 2019-12-24 2020-04-03 黑龙江幸福人生态农业开发股份有限公司 一种使用甘蔗生物质粉为原料的生物基复合材料制备方法

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DE102022134621A1 (de) 2022-12-22 2024-06-27 Siempelkamp Maschinen- Und Anlagenbau Gmbh Verfahren zum Herstellen von Partikeln für die Produktion einer Werkstoffplatte sowie Werkstoffplatte

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CL2008001199A1 (es) 2010-01-11
CN101678557A (zh) 2010-03-24
CN101678557B (zh) 2014-07-02
US20100132898A1 (en) 2010-06-03
EP2142348A1 (fr) 2010-01-13
BRPI0810574A2 (pt) 2014-10-29
WO2008129048A1 (fr) 2008-10-30
BRPI0810574B1 (pt) 2018-10-23
US8784607B2 (en) 2014-07-22
JP2010524738A (ja) 2010-07-22
ES2447870T3 (es) 2014-03-13
JP5371955B2 (ja) 2013-12-18
PL2142348T3 (pl) 2014-05-30

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