Voith Patent Gmbh

Voith Paper Patent Gmbh

Hans-Ludwig Schubert

Esa-Matti Aalto

Volker Niggl

Almut Kriebel

Volker Gehr

Falk Albrecht

Rudolf Patt

Othar Kordsachia

Christoph Storz

Fred Unger

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.

Lignocellulosic fibrous material made of wood

Process for increasing the water retaining ability of fibrous paper stocks. The process includes knead dispersing a fibrous paper stock having a stock concentration of at least about 20% and a temperature greater than about 45&deg; C. A treatment for the knead dispersing is at least about 10 seconds. The process further includes completing a post-treatment phase to a machine tub of a paper machine in a reaction time of no longer than about 30 minutes.

Process for increasing the water retention capacity in fibrous webs

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Baienfurt, Germany

Hans-Ludwig Schubert