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Difference between revisions of "Pulping"
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In this refiner process the biomass is preheated by impregnation of steam under pressure. The high temperature (115-155 °C) softens the lignin and helps in fibre separation. The refining takes place in two steps, the first at elevated pressure and temperature, around the glass transition temperature of lignin (140 °C), the second at atmospheric pressure and temperature. The resulting yields are high (>93%) and the pulp is characterised by its high strength.<ref name=":1" /> | In this refiner process the biomass is preheated by impregnation of steam under pressure. The high temperature (115-155 °C) softens the lignin and helps in fibre separation. The refining takes place in two steps, the first at elevated pressure and temperature, around the glass transition temperature of lignin (140 °C), the second at atmospheric pressure and temperature. The resulting yields are high (>93%) and the pulp is characterised by its high strength.<ref name=":1" /> | ||
==== | ==== Groundwood ==== | ||
===== Pressure groundwood (PGW) ===== | ===== Pressure groundwood (PGW) ===== | ||