Process to produce a functional pre-preg mat from ligno-cellulosic materials

A process for a manufacture of a functional pre-preg mat of ligno-cellulosic material, wherein:

• ligno-cellulosic fibres are mixed with at least one functional solution including a cross-linking formulation containing at least one cross-linking agent, the at least one cross-linking agent is a carboxylic acid having at least two carboxyl groups in combination with a polyol, wherein the cross-linking formulation has been prepared by dissolving the at least one cross-linking agent in a water based solvent or alcohol based solvent at a temperature below 120° C.,
• ligno-cellulosic fibres treated with the at least one functional solution are discharged to a dewatering process where excess solution is removed and the treated ligno-cellulosic fibres are formed into a continuous mat,
• the mat of pre-preg ligno-cellulosic fibres formed in the previous step is transferred to a drying step during which a temperature within the ligno-cellulosic mat is kept below 120° C., the drying preferably being performed until a moisture content of the mat is 20% or less.