A method for alkaline delignification of paulownia, in which chips of annual paulownia wood are loaded into a cooking apparatus, poured with a cooking solution at a hydraulic module of 5:1, and impregnated with this solution. The cooking solution is a sodium hydroxide solution with a consumption of 14 % by weight of absolutely dry wood, after pouring the solution into the chips, the temperature is raised for at least 25 minutes from 95 °C to 130 °C and they are directly cooked at a final temperature of 130 °C for 30, 90, and 150 minutes, followed by grinding the semi-finished products in a centrifugal grinding machine and making samples.
The utility model relates to methods of producing fibrous semi-finished products from hardwood, which are used for the production of paper and cardboard.
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