Voith Patent Gmbh

Esa-Matti Aalto

Hans-Ludwig Schubert

Rudolf Patt

Christoph Storz

Othar Kordsachia

A process for producing fibrous material which includes the following: preparing a solution of chemicals that includes less than 25% of sulphite (calculated as NaSO), based on the oven-dry amount of the lignocellulosic raw material; mixing the solution of chemicals with wood in a specified liquor material; heating the solution of chemicals and the wood to a temperature above room temperature; and then either of the following alternatives: (1) removing the free-flowing solution of chemicals and digestion of the wood in the vapor phase; (2) having the wood digested in the liquid phase and separating the free-flowing solution of chemicals and the wood.

Process for producing fibrous material from wood

The invention relates to a wood-based lignocellulosic fibrous material having a tearing length of more than 8 km at 15&#xb0; SR and a lignin content of at least 15%, based on the unbleached oven-dry fibrous material, for coniferous wood and having a tearing length of more than 5.0 km at 20&#xb0; SR and a lignin content of at least 12%, based on the unbleached oven-dry fibrous material, for deciduous wood.

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Ravensburg, Germany

Esa-Matti Aalto