Method for producing wood fibre pellets
First Claim
1. A process for producing pellets or granules comprising wood fibres, for use as a feedstock in plastics manufacture, which comprisesapplying to wood, wood fibres or fibre bundles prior to a blowline, the wood fibres or fibre bundles being produced by mechanically or thermomechanically or chemo-thermomechanically or chemo-mechanically breaking down the wood in a refiner, a liquid formulation comprising one or more thermoplastic polymers, monomers, or oligomers to coat or partially coat the fibres,pressing the fibres into a solid product, andbreaking down the solid product into wood fibre-containing pellets or granules,the pellets or granules comprising 0.3 to 25 parts per 100 parts of fibre by dried weight of one or more thermoplastic polymers or thermoplastic oligomers.
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Abstract
A process for producing pellets or granules comprising fibres of a lignocellulousic material, for use as a feedstock in plastics manufacture, conveying in a dry or wet air stream and applying to the fibres a liquid formulation comprising one or more polymers, monomers, or oligomers, forming the fibres into a solid product, and breaking down the solid product to produce said pellets or granules. Typically the conduit conveys the fibres in a plant for manufacture of fibre board.
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Citations
25 Claims
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1. A process for producing pellets or granules comprising wood fibres, for use as a feedstock in plastics manufacture, which comprises
applying to wood, wood fibres or fibre bundles prior to a blowline, the wood fibres or fibre bundles being produced by mechanically or thermomechanically or chemo-thermomechanically or chemo-mechanically breaking down the wood in a refiner, a liquid formulation comprising one or more thermoplastic polymers, monomers, or oligomers to coat or partially coat the fibres, pressing the fibres into a solid product, and breaking down the solid product into wood fibre-containing pellets or granules, the pellets or granules comprising 0.3 to 25 parts per 100 parts of fibre by dried weight of one or more thermoplastic polymers or thermoplastic oligomers.
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23. A process for producing pellets or granules comprising wood fibres, for use as a feedstock in plastics manufacture, which comprises
applying to wood, wood fibres or fibre bundles prior to a blowline, the wood fibres or fibre bundles being produced by mechanically or thermomechanically or chemo-thermomechanically or chemo-mechanically breaking down the wood in a refiner, a liquid formulation comprising one or more thermoplastic polymers, monomers, or oligomers to coat or partially coat the fibres, conveying the fibres along a conduit in a dry or wet stream and introducing a formaldehyde or isocyanate resin or a further liquid formulation comprising one or more thermoplastic polymers, monomers, or oligomers into the interior of the conduit to apply the formaldehyde or isocyanate resin or liquid formulation to the fibres while the fibres are moving through the conduit, the conduit conveying the fibres from the refiner or to or from a drying stage or drier in a plant for manufacture of fibre board, pressing the fibres into a solid product, and breaking down the solid product into wood fibre-containing pellets or granules, the pellets or granules comprising 0.3 to 25 parts per 100 parts of fibre by dried weight of one or more thermoplastic polymers or thermoplastic oligomers.
Specification