EP3135811A1 - Production method of pulp derived from biomass for producing composite boards, and a pulp board - Google Patents

Production method of pulp derived from biomass for producing composite boards, and a pulp board Download PDF

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Publication number
EP3135811A1
EP3135811A1 EP15182673.2A EP15182673A EP3135811A1 EP 3135811 A1 EP3135811 A1 EP 3135811A1 EP 15182673 A EP15182673 A EP 15182673A EP 3135811 A1 EP3135811 A1 EP 3135811A1
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EP
European Patent Office
Prior art keywords
pulp
hydrothermal treatment
board
fibres
blades
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Granted
Application number
EP15182673.2A
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German (de)
French (fr)
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EP3135811B1 (en
Inventor
Robert KOCEWICZ
Leszek Stanislaw DANECKI
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VESTAECO COMPOSITES SP. Z O.O.
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Vestaeco SA
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Priority to PL15182673T priority Critical patent/PL3135811T3/en
Priority to EP15182673.2A priority patent/EP3135811B1/en
Publication of EP3135811A1 publication Critical patent/EP3135811A1/en
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Publication of EP3135811B1 publication Critical patent/EP3135811B1/en
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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
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/14—Disintegrating in mills
    • D21B1/16—Disintegrating in mills in the presence of chemical agents
    • 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
    • D21C1/00—Pretreatment of the finely-divided materials before digesting
    • D21C1/02—Pretreatment of the finely-divided materials before digesting with water or steam
    • 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
    • D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
    • 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
    • D21H13/10—Organic non-cellulose fibres
    • 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
    • D21H13/10—Organic non-cellulose fibres
    • D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H13/26—Polyamides; Polyimides
    • 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
    • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/47—Condensation polymers of aldehydes or ketones
    • D21H17/49—Condensation polymers of aldehydes or ketones with compounds containing hydrogen bound to nitrogen
    • D21H17/51—Triazines, e.g. melamine
    • 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

Definitions

  • the subject of an invention is a production method of pulp for producing composite boards from lignocellulosic fibres derived from biomass, as well as a pulp board produced according to the method.
  • Boards made from pulp are applied in timber industries, i.e. for producing furniture, floor panels, decorative strips, as well as in the construction sector as insulating materials, both thermal and acoustic.
  • materials Residues
  • a chipboard is produced through joining relatively large fragments of wood with resin, whereas a fibreboard is produced through connecting separated lignocellulosic fibres with resin.
  • Blades are cut, soaked in water and treated with steam under high pressure in order to soften the stems. Blades prepared in such a way may be mixed in any proportions with other fibre materials, such as fibres derived from wood, and used in wet, dry, and wet-dry wood-like board production.
  • US 6,596,209 document presents a production of chipboards from materials of non-woodworking origin, where resources preferred are selected according to high cellulose and hemicellulose level and low silica level.
  • the processing method is characterized by a short time of cleaning and low pressure of steam softening the blades.
  • fibreboards are made from fibres of deciduous or coniferous trees, joined together with waxes or resins in high temperature and increased pressure. Boards produced in such a way are characterized by high homogeneity and dimensional stability, constituting a valued building material. Production parameters have an influence on the end product parameters, such as durability and density, which allows to obtain boards for various purposes. Low density boards are suitable for acoustic insulation, whereas high density boards are used in woodwork.
  • Properties of fibreboards may exceed parameters of solid wood, and the possibility of using various additives allows to produce boards with special parameters, such as fire resistance and moisture resistance.
  • Using antraquinone known from the paper production process positively influences water resistance of the boards.
  • US 1,627,103 document reveals a board production processed based on fibres from sugarcane residue boiled in calcium hydroxide solution.
  • insecticides may be added to fibres treated in such a way in order to produce an insect resistant board.
  • cement with sodium silicate it is possible to add cement with sodium silicate.
  • a product obtained in such a way may be cut, sawn and processed similarly to ordinary wood.
  • WO 2006076814 patent document reveals urea, melamine, formaldehyde, phenolic and isocyanate resins as fillers joining lignocellulosic fibres in a board.
  • WO2006076814 document reveals potential sources of fibres for producing fibreboards. Fibres suitable for fibreboard production may be derived from widely cultivated plants, such as hemp, sugarcane, bamboo, banana tree stems and leaves, coir, coconut, corn, cotton, flax, papyrus, rice, wheat, rye, grass, straw and oats. Using such materials allows to limit the amount of agricultural waste and save valuable resources such as wood.
  • EP 0644861 document reveals a method of cellulosic fibre mass production from fragmented waste paper and wood waste, which is formed into boards after mechanical treatment.
  • EP 1412566 reveals a method of producing nonwoven fabric including the use of cellulosic fibres from waste paper processing that are bound with the help of thermoplastic elastomer fibres.
  • waxes such as beeswax, paraffin, lanolin and jojoba oil
  • plastics such as polyethylene and polypropylene
  • the essence of the invention is the method of pulp production for producing boards; cereal straw is fragmented to the form of blades with a length from 10 to 50 mm, which are then subjected to hydrothermal treatment. Mass obtained is injected with the help of a feeding machine between the milling plates of the defibering unit until it is defibered, and then pressed with the help of a screw press until obtaining absolute humidity below 50%. Mass obtained is loosened into the pulp form and dried.
  • the method is characterized in that the cut cereal straw blades are subjected to hydrothermal treatment with water mixture at temperature below 50°C, where hydrothermal treatment does not last longer than 1 minute.
  • a method according to the invention is characterized in that a hydrothermal treatment takes place in water and lye solution. Such a solution allows straw maceration and results in reducing energy consumption of the defibering process.
  • a method according to the invention is characterized in that a hydrothermal treatment takes place while evenly feeding mass of concentration between 8 and 10% between round knives.
  • a method according to the invention is characterized in that cellulosic resources, especially waste paper fibres in a proportion up to 50% by weight of cellulosic fibres, are also added to cereal straw blades.
  • cellulosic resources especially waste paper fibres in a proportion up to 50% by weight of cellulosic fibres
  • Such a solution conveniently influences the cohesion of mass, since cellulosic fibre is finer than straw fibre.
  • the method according to the invention is characterized in that cereal straw is fragmented to the form of blades with a length from 10 to 50 mm, conveniently to 30 mm.
  • the lengths of fibres according to the invention conveniently influence physical-mechanical properties of products obtained.
  • An essence of the invention is also a pulp board, characterized in that it contains pulp produced according to the method according to the invention and the binder.
  • a board according to the invention is characterized in that it also contains an additive of non-defibered particles of lignocellulosic material, amounting from 1% to 50% by weight. Thanks to introducing defibered particles, it is possible to shape physical-mechanical properties of a ready product.
  • a board according to the invention is characterized in that it also contains an additive of plastic fibres, especially an additive of aramid fibres. Thanks to introducing non-defibered particles, it is possible to shape physical-mechanical properties of a ready product.
  • a board according to the invention is characterized in that it also contains an additive of cellulosic acetate. Thanks to the introduction of cellulosic acetate, an improvement of hydrophobic properties and cohesion of the boards has been obtained.
  • a board according to the invention is characterized in that its binder is melamine-urea-formaldehyde resin, isocyanate adhesive or mixture of both, conveniently in the amount relative to dry mass of the product between 5% and 15%, more conveniently between 8% and 12%.
  • a binder according to the invention in the proportions indicated above allows to obtain required usage properties (including especially durability) of boards.
  • the advantage of the invention is using agricultural waste for producing dry-formed boards.
  • Boards of low density may be used as insulation material and as external room insulation, securing i.e. against changes caused by weather conditions. Specific properties of the product allow to protect buildings against overheating in summer and overcooling in winter. Also, the building material of the board is characterized by high capacity of noise suppression, thanks to which the transfer of high pitched sounds from external sources is significantly reduced.
  • the product of medium density constitutes an alternative to MDF, HDF and OSB boards used in the furniture sector, competitive both in quality and price.
  • a low level of energy is necessary for obtaining a resource, which results in lower production costs and a lower price of an end product.
  • An advantage of the method of board production according to the invention is using easily accessible and rapidly renewable materials constituting agricultural waste for producing wood-like boards in the process of resource treatment in lowered temperature. Mass obtained in such a way is characterized by a specific amount of fats and other hydrophobic substances. Mass obtained in such a way may be stored in a silo for further use or directly mixed with resin and additives, and fed to the board production press. Thanks to natural occurrence of hydrophobic substances in straw, such a board is characterized by an increased moisture resistance.
  • Fig. 1 presents the process of pulp production and its further treatment in order to produce a wood-like board.
  • resources are cleaned in order to remove small stones and other non-organic materials.
  • cereal straw with additives is fragmented until obtaining fibres with a length from 30 to 50 m.
  • Lignocellulosic fibres cut in such a way are loosened hydrothermally in temperature of 50°C.
  • Water and lye solution is fed into the zone between the milling plates.
  • the resource is loosed mechanically through injecting mass with the help of a feeding machine between the milling plates zone of an appropriate defibering unit, while water is fed simultaneously to the milling zone in order to remove excess heat released in the defibering process.
  • mass is pressed with the help of a screw press until obtaining humidity below 50%, and loosened with a mixer and dried into the dry fibre mixture form. Mass obtained in such a way may be stored in a silo for further use or directly mixed with resin and additives, and fed to the composite board production press.
  • biomass used may be derived from agricultural waste, especially straw.
  • Pulp may contain additives in the form of fibres from fragmented waste paper. Straw is fragmented to the form of blades with a length from 10 to 50 mm, which are then subjected conveniently to intense and short hydrothermal treatment with using alkaline solution at temperature lower than 50°C together with an additive of other lignocellulosic resources.
  • the resource is loosed mechanically through injecting mass with the help of a feeding machine between the milling plates zone of an appropriate defibering unit, and pressed with the help of a screw press until obtaining humidity below 50%. Next, mass obtained is loosened into the pulp form and dried.
  • a hydrothermal treatment takes place water and lye solution.
  • a hydrothermal treatment takes place while evenly feeding mass of concentration between 8 and 10% between round knives.
  • a pulp board may contain an additive of non-defibered particles of lignocellulosic material, amounting from 1% to 50% by weight.
  • a pulp board may also contain an additive of plastic fibres, especially an additive of aramid fibres.
  • a pulp board may contain an additive of cellulosic acetate.
  • a board made from pulp of low density with using 75% of lignocellulosic fibre and 25% of cellulosic fibre from waste paper has been obtained; the mixture was subjected to treatment method according to the invention, especially with using hydrothermal treatment with water mixture at 50°C.
  • An appropriate time of pressing allows to obtain a board of density from 120 to 300 kg/m 3 ; especially convenient insulation properties are obtained with density from 170 to 190 kg/m 3 .
  • a board made from pulp of high density with using 70% of lignocellulosic fibre and 30% of cellulosic fibre from waste paper has been obtained; the mixture was subjected to treatment method according to the invention, especially with using hydrothermal treatment with water mixture at temperature of 45°C.
  • Melamine-urea-formaldehyde resin (MUF) amounting to 12% was used as a binder for board production.
  • An appropriate time of pressing allows to obtain a board of density from 700 to 900 kg/m 3 ; especially convenient mechanical properties are obtained with density from 700 to 750 kg/m 3 .

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)

Abstract

The subject of application is a method of pulp production for producing boards. Cereal straw is fragmented to the form of blades with a length from 10 to 50 mm, which are subjected to hydrothermal treatment. Then, mass obtained in such a way is injected with the help of a feeding machine between the milling plates of the defibering unit, and pressed with the help of a screw press until obtaining absolute humidity below 50%, when mass obtained is loosened into the pulp form and dried. The method is characterized in that the cut cereal straw blades are subjected to hydrothermal treatment with water solution and lye at temperature below 50°C, where hydrothermal treatment does not last longer than 1 minute. The subject of application is also a pulp board, characterized in that it contains pulp produced with a method according to the invention and a binder.

Description

  • The subject of an invention is a production method of pulp for producing composite boards from lignocellulosic fibres derived from biomass, as well as a pulp board produced according to the method.
  • Boards made from pulp are applied in timber industries, i.e. for producing furniture, floor panels, decorative strips, as well as in the construction sector as insulating materials, both thermal and acoustic.
  • A demand for cheap construction materials, including boards for furniture production, has led to creating composite materials based on materials (residues) derived from woodworking. An example of such materials that are very well known in industry is a chipboard and a fibreboard. A chipboard is produced through joining relatively large fragments of wood with resin, whereas a fibreboard is produced through connecting separated lignocellulosic fibres with resin.
  • Materials derived from woodworking became more expensive and less available, which has led to the development of board production on the basis of lignocellulosic fibres of non-wooden origin. A method of chipboard production with the use of resources derived from agriculture, such as straw, is known from US 5,656,129 patent document. Blades are cut, soaked in water and treated with steam under high pressure in order to soften the stems. Blades prepared in such a way may be mixed in any proportions with other fibre materials, such as fibres derived from wood, and used in wet, dry, and wet-dry wood-like board production.
  • US 6,596,209 document presents a production of chipboards from materials of non-woodworking origin, where resources preferred are selected according to high cellulose and hemicellulose level and low silica level. The processing method is characterized by a short time of cleaning and low pressure of steam softening the blades. Waste derived from agriculture, such as straw of different origin, grass, paper production waste (collectively defined as biomass), is used as a resource.
  • Traditionally, fibreboards are made from fibres of deciduous or coniferous trees, joined together with waxes or resins in high temperature and increased pressure. Boards produced in such a way are characterized by high homogeneity and dimensional stability, constituting a valued building material. Production parameters have an influence on the end product parameters, such as durability and density, which allows to obtain boards for various purposes. Low density boards are suitable for acoustic insulation, whereas high density boards are used in woodwork.
  • Properties of fibreboards may exceed parameters of solid wood, and the possibility of using various additives allows to produce boards with special parameters, such as fire resistance and moisture resistance. Using antraquinone known from the paper production process positively influences water resistance of the boards.
  • Using sodium silicate in wood-like board production generally increases fire resistance; however, it causes the boards to become susceptible to water. In US 4,761,342 document, an inorganic binding additive to boards increasing their fire resistance has been revealed. This additive consists of calcium and/or magnesium, sulphur or inorganic sulphur compound, and alkaline metal silicate. This additive does not contain organic resins, which may emit harmful gases.
  • US 1,627,103 document reveals a board production processed based on fibres from sugarcane residue boiled in calcium hydroxide solution. Before forming a board, insecticides may be added to fibres treated in such a way in order to produce an insect resistant board. In order to produce a board of increased durability, it is possible to add cement with sodium silicate. A product obtained in such a way may be cut, sawn and processed similarly to ordinary wood.
  • The publication of US 20030015283 patent application reveals the method of wood-like board production method based on water hyacinth characterized by satisfactory parameters even without using synthetic additives, such as resin. Yet, it is only an exception; various forms of resins and thermoplastic materials are used for joining lignocellulosic fibres in fibreboards.
  • However, WO 2006076814 patent document reveals urea, melamine, formaldehyde, phenolic and isocyanate resins as fillers joining lignocellulosic fibres in a board. WO2006076814 document reveals potential sources of fibres for producing fibreboards. Fibres suitable for fibreboard production may be derived from widely cultivated plants, such as hemp, sugarcane, bamboo, banana tree stems and leaves, coir, coconut, corn, cotton, flax, papyrus, rice, wheat, rye, grass, straw and oats. Using such materials allows to limit the amount of agricultural waste and save valuable resources such as wood.
  • EP 0644861 document reveals a method of cellulosic fibre mass production from fragmented waste paper and wood waste, which is formed into boards after mechanical treatment. EP 1412566 reveals a method of producing nonwoven fabric including the use of cellulosic fibres from waste paper processing that are bound with the help of thermoplastic elastomer fibres. Both various kinds of waxes, such as beeswax, paraffin, lanolin and jojoba oil, and plastics, such as polyethylene and polypropylene, are often used as additives.
  • With today's technology, using hydrothermal treatment assuming the use of water at high temperature and high pressure has been revealed as the first stage of production of pulp derived from biomass. Using large amounts of water at high temperature, often in the form of superheated steam under high pressure, has a negative influence on the economic balance; it is expensive and energy-intensive.
  • The essence of the invention is the method of pulp production for producing boards; cereal straw is fragmented to the form of blades with a length from 10 to 50 mm, which are then subjected to hydrothermal treatment. Mass obtained is injected with the help of a feeding machine between the milling plates of the defibering unit until it is defibered, and then pressed with the help of a screw press until obtaining absolute humidity below 50%. Mass obtained is loosened into the pulp form and dried. The method is characterized in that the cut cereal straw blades are subjected to hydrothermal treatment with water mixture at temperature below 50°C, where hydrothermal treatment does not last longer than 1 minute.
  • Thanks to introducing the method according to the invention, energy consumption of the production process is reduced both by reducing the demand for thermal energy necessary for heating technological water and by reducing electrical energy necessary for conducting the loosening process. Also, a further technological effect is reducing the risk of charring/scorching fibres on round knives in further stages of production.
  • Also, a method according to the invention is characterized in that a hydrothermal treatment takes place in water and lye solution. Such a solution allows straw maceration and results in reducing energy consumption of the defibering process.
  • Also, a method according to the invention is characterized in that a hydrothermal treatment takes place while evenly feeding mass of concentration between 8 and 10% between round knives.
  • Thanks to introducing mass concentration from the range according to the invention an increase of production energy consumption may be avoided when the concentration is below 8%, which results from larger amount of technological water per dry mass unit. Also, reducing concentration to 10% reduces the risk of charring/scorching fibres on round knives and the risk of hampered transport of wet mass in further production stages.
  • Also, a method according to the invention is characterized in that cellulosic resources, especially waste paper fibres in a proportion up to 50% by weight of cellulosic fibres, are also added to cereal straw blades. Such a solution conveniently influences the cohesion of mass, since cellulosic fibre is finer than straw fibre.
  • Also, the method according to the invention is characterized in that cereal straw is fragmented to the form of blades with a length from 10 to 50 mm, conveniently to 30 mm. The lengths of fibres according to the invention conveniently influence physical-mechanical properties of products obtained.
  • An essence of the invention is also a pulp board, characterized in that it contains pulp produced according to the method according to the invention and the binder.
  • A board according to the invention is characterized in that it also contains an additive of non-defibered particles of lignocellulosic material, amounting from 1% to 50% by weight. Thanks to introducing defibered particles, it is possible to shape physical-mechanical properties of a ready product.
  • A board according to the invention is characterized in that it also contains an additive of plastic fibres, especially an additive of aramid fibres. Thanks to introducing non-defibered particles, it is possible to shape physical-mechanical properties of a ready product.
  • A board according to the invention is characterized in that it also contains an additive of cellulosic acetate. Thanks to the introduction of cellulosic acetate, an improvement of hydrophobic properties and cohesion of the boards has been obtained.
  • A board according to the invention is characterized in that its binder is melamine-urea-formaldehyde resin, isocyanate adhesive or mixture of both, conveniently in the amount relative to dry mass of the product between 5% and 15%, more conveniently between 8% and 12%. Using a binder according to the invention in the proportions indicated above allows to obtain required usage properties (including especially durability) of boards.
  • The advantage of the invention is using agricultural waste for producing dry-formed boards. Boards of low density may be used as insulation material and as external room insulation, securing i.e. against changes caused by weather conditions. Specific properties of the product allow to protect buildings against overheating in summer and overcooling in winter. Also, the building material of the board is characterized by high capacity of noise suppression, thanks to which the transfer of high pitched sounds from external sources is significantly reduced. The product of medium density constitutes an alternative to MDF, HDF and OSB boards used in the furniture sector, competitive both in quality and price.
  • Using pulp obtained from straw and waste paper increases the product's resistance to swelling and tensile strength perpendicular to board surface without a negative influence on the remaining properties of boards produced.
  • A low level of energy is necessary for obtaining a resource, which results in lower production costs and a lower price of an end product.
  • Using rapidly renewable resources of waste character, both in the form of re-used straw constituting waste from cereal production process and waste paper undergoing recycling process, together with reducing energy consumption and limiting the use of additives with a strong environmental impact (mainly harmful binders) causes the fibreboard as the subject of the invention to be a product almost perfectly suitable for re-processing, thanks to which its influence on the environment is significantly reduced. Composting and biodegradation of low and medium density boards is possible.
  • An advantage of the method of board production according to the invention is using easily accessible and rapidly renewable materials constituting agricultural waste for producing wood-like boards in the process of resource treatment in lowered temperature. Mass obtained in such a way is characterized by a specific amount of fats and other hydrophobic substances. Mass obtained in such a way may be stored in a silo for further use or directly mixed with resin and additives, and fed to the board production press. Thanks to natural occurrence of hydrophobic substances in straw, such a board is characterized by an increased moisture resistance.
  • The subject of the invention has been presented in more detail in a convenient example of execution in a form of a drawing (fig. 1), in which the process of pulp production and pulp board has been schematically shown.
  • Fig. 1 presents the process of pulp production and its further treatment in order to produce a wood-like board. At the beginning, resources are cleaned in order to remove small stones and other non-organic materials. Next, cereal straw with additives is fragmented until obtaining fibres with a length from 30 to 50 m. Lignocellulosic fibres cut in such a way are loosened hydrothermally in temperature of 50°C. Water and lye solution is fed into the zone between the milling plates. The resource is loosed mechanically through injecting mass with the help of a feeding machine between the milling plates zone of an appropriate defibering unit, while water is fed simultaneously to the milling zone in order to remove excess heat released in the defibering process. After short-time defibering, mass is pressed with the help of a screw press until obtaining humidity below 50%, and loosened with a mixer and dried into the dry fibre mixture form. Mass obtained in such a way may be stored in a silo for further use or directly mixed with resin and additives, and fed to the composite board production press.
  • In a convenient example of execution, biomass used may be derived from agricultural waste, especially straw. Pulp may contain additives in the form of fibres from fragmented waste paper. Straw is fragmented to the form of blades with a length from 10 to 50 mm, which are then subjected conveniently to intense and short hydrothermal treatment with using alkaline solution at temperature lower than 50°C together with an additive of other lignocellulosic resources. The resource is loosed mechanically through injecting mass with the help of a feeding machine between the milling plates zone of an appropriate defibering unit, and pressed with the help of a screw press until obtaining humidity below 50%. Next, mass obtained is loosened into the pulp form and dried. A hydrothermal treatment takes place water and lye solution. A hydrothermal treatment takes place while evenly feeding mass of concentration between 8 and 10% between round knives.
  • A pulp board may contain an additive of non-defibered particles of lignocellulosic material, amounting from 1% to 50% by weight. A pulp board may also contain an additive of plastic fibres, especially an additive of aramid fibres. A pulp board may contain an additive of cellulosic acetate. A pulp board, the binder of which is melamine-urea-formaldehyde resin or isocyanate adhesive, conveniently in the amount relative to dry mass of the product between 5% and 15%, more conveniently between 8% and 12%.
    • Example 1
  • In the first example, a board made from pulp of low density with using 75% of lignocellulosic fibre and 25% of cellulosic fibre from waste paper has been obtained; the mixture was subjected to treatment method according to the invention, especially with using hydrothermal treatment with water mixture at 50°C. Melamine-urea-formaldehyde resin (MUF) amounting to 10%, together with isocyanate adhesive (pMDI) amounting to 2% relative to dry mass of the product, were used as binders for board production. 10 ppm of nanosilver particles were used as a biocidal additive.
  • An appropriate time of pressing allows to obtain a board of density from 120 to 300 kg/m3; especially convenient insulation properties are obtained with density from 170 to 190 kg/m3.
    • Example 2
  • In the second example, a board made from pulp of high density with using 70% of lignocellulosic fibre and 30% of cellulosic fibre from waste paper has been obtained; the mixture was subjected to treatment method according to the invention, especially with using hydrothermal treatment with water mixture at temperature of 45°C. Melamine-urea-formaldehyde resin (MUF) amounting to 12% was used as a binder for board production.
  • An appropriate time of pressing allows to obtain a board of density from 700 to 900 kg/m3; especially convenient mechanical properties are obtained with density from 700 to 750 kg/m3.

Claims (10)

1. Method of pulp production for producing boards where
cereal straw is fragmented to the form of blades with a length from 10 to 50 mm,
which are subjected to hydrothermal treatment, then
mass obtained in such a way is injected with the help of a feeding machine between the milling plates of the defibering unit, and pressed
with the help of a screw press until obtaining absolute humidity below 50%, then mass obtained is loosened into the pulp form and dried
characterized in that
cut cereal straw blades are subjected to hydrothermal treatment with the use of water mixture at temperature below 50°C, where
hydrothermal treatment does not last longer than 1 minute.
2. A method according to claim 1, characterized in that a hydrothermal treatment takes place in water and lye solution.
3. A method according to claim 1 and 2, characterized in that a hydrothermal treatment takes place while evenly feeding mass of concentration from 8 to 10% between round knives.
4. A method according to any of claims 1-3, characterized in that cellulosic resources, especially waste paper fibres in a proportion up to 50% by weight of cellulosic fibres, are also added to cereal straw blades.
5. A method according to any of claims 1-4, characterized in that cereal straw is fragmented to the form of blades with a length from 10 to 50 mm, conveniently to 30 mm.
6. A pulp board, characterized in that it contains pulp produced according to any of claims 1-6 and a binder.
7. A board according to claim 6, characterized in that it also contains an additive of non-defibered particles of lignocellulosic material, amounting from 1% to 50% by weight.
8. A board according to claim 6 or 7, characterized in that it also contains an additive of plastic fibres, especially an additive of aramid fibres.
9. A board according to any of claims 6-8, characterized in that it also contains an additive of cellulose acetate.
9. A board according to any of claims 6-9, characterized in that its binder is melamine-urea-formaldehyde resin or isocyanate adhesive, conveniently in the amount relative to dry mass of the product between 5% and 15%, more conveniently between 8% and 12%.
EP15182673.2A 2015-08-27 2015-08-27 Production method of pulp derived from biomass for producing composite boards Active EP3135811B1 (en)

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PL15182673T PL3135811T3 (en) 2015-08-27 2015-08-27 Production method of pulp derived from biomass for producing composite boards
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EP15182673.2A EP3135811B1 (en) 2015-08-27 2015-08-27 Production method of pulp derived from biomass for producing composite boards

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CN108999014A (en) * 2017-06-07 2018-12-14 宁波恒麟环保科技有限公司 Stalk paper technology
EP3461940A1 (en) * 2017-09-29 2019-04-03 Daw Se Method for the manufacture of fibrous material and fibrous materials produced in accordance with the method and their use
CN114368053A (en) * 2022-01-25 2022-04-19 浙江省林业科学研究院 High-viscosity flowing state fiber suspension and preparation method and application thereof
PL442414A1 (en) * 2022-09-30 2024-04-02 Vestaeco Nonwovens Spółka Z Ograniczoną Odpowiedzialnością Method for producing a fibrous mat from plant biomass fibers bonded with two-component thermoplastic fibers

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US1627103A (en) 1926-09-09 1927-05-03 Charles W Mason Bagasse board and method of making the same
AT277746B (en) * 1963-05-31 1970-01-12 Defibrator Ab Process for the production of fibers containing lignocellulose or wood pulp from wood chips
US4761342A (en) 1984-03-16 1988-08-02 Nova Scand Utveckling Ab Fibre board, a method for making it, and a binder composition
EP0644861A1 (en) 1992-06-05 1995-03-29 Thieme Gotthardt Insulating material based on used raw materials and on fibrous raw materials, and process for producing the same.
US5656129A (en) 1995-05-31 1997-08-12 Masonite Corporation Method of producing fibers from a straw and board products made therefrom
WO2000025600A1 (en) * 1998-11-04 2000-05-11 Weyerhaeuser Company Method for processing straw pulp
US6596209B2 (en) 2000-08-10 2003-07-22 California Agriboard Llc Production of particle board from agricultural waste
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108999014A (en) * 2017-06-07 2018-12-14 宁波恒麟环保科技有限公司 Stalk paper technology
EP3461940A1 (en) * 2017-09-29 2019-04-03 Daw Se Method for the manufacture of fibrous material and fibrous materials produced in accordance with the method and their use
CN114368053A (en) * 2022-01-25 2022-04-19 浙江省林业科学研究院 High-viscosity flowing state fiber suspension and preparation method and application thereof
PL442414A1 (en) * 2022-09-30 2024-04-02 Vestaeco Nonwovens Spółka Z Ograniczoną Odpowiedzialnością Method for producing a fibrous mat from plant biomass fibers bonded with two-component thermoplastic fibers

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PL3135811T3 (en) 2018-03-30

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