Sappi Netherlands Services B.v.

Imperial College of Science, Technology and Medicine

Philip Turner

Zurine Hernandez

Callum Hill

Ian Graveson

Richard J Murphy

David J Dickinson

Richard James Murphy

David John Dickinson

A method for the spinning of a fiber comprising cellulose nano-fibrils aligned along the main axis of the fiber from a lyotropic suspension of cellulose nano-fibrils, the nano-fibril alignment being achieved through extension of the extrude fiber from a die, spinneret or needle, wherein the fiber is dried under extension and the aligned nano-fibrils aggregate to form a continuous structure and wherein the suspension of nano-fibrils, which has a concentration of solids of at least 7% wt, is homogenized using at least a mechanical, distributive mixing process prior to its extrusion. The fibrils used in this method can be extracted from a cellulose-rich material such as wood. The invention also related to a cellulose-based fiber obtained according to this method and to a cellulose fiber which contains at least 90% wt of crystallized cellulose.

Process for the manufacture of cellulose-based fibres and the fibres thus obtained

A method for the spinning of a fiber comprising cellulose nano-fibrils being aligned along the main axis of the fiber from a lyotropic suspension of cellulose nano-fibrils, said nano-fibril alignment being achieved through extension of the extruded fiber from a die, spinneret or needle, wherein said fiber is dried under extension and the aligned nano-fibrils aggregate to form a continuous structure. The fibrils used in this method can be extracted from a cellulose-rich material such as wood. The invention also related to a cellulose-based fiber obtained according to this method and to a cellulose fiber which contains at least 90% wt of crystallized cellulose.

Process for the manufacture of cellulose-based fibers

The present invention is directed towards a method for spinning neutral or anionically modified cellulose comprising the steps of: (a) preparing a suspension of the neutral or anionically modified cellulose in a continuous phase; (b) subjecting the suspension to high shear rate; (c) performing spinning by extruding the cellulose suspension into an airgap region comprising at least one heated zone to obtain spun fibers, (d) subjecting the spun fibers to at least one washing stages and (e) isolating the spun fibers from the at least one washing stages; as well as fibers obtained based on the method of the invention and paper or board products derived from such fibers.

Method for dry spinning neutral and anionically modified cellulose and fibres made using the method

Treatment of wood and wood-based materials

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Edinburgh, United Kingdom

Philip Turner