Method for manufacturing a composite filament and use thereof

A method for manufacturing a composite filament aimed to an additive manufacturing application or a winding application, said method comprising, in the following order:

• providing a thread of fibers;
• impregnating the thread with a liquid reactive thermoplastic resin;
• co-extruding a sheath of thermoplastic material around the impregnated thread;
• and
• curing the thermoplastic resin.

A machine for producing a composite filament, said method comprising:

• a spool holder containing a thread,
• an impregnator that impregnates the thread with a thermoplastic resin,
• an extruder for co-extruding a sheath of thermoplastic material around the uncured impregnated thread,
• an oven for curing the thermoplastic resin,
• a puller for pulling the filament through all the elements of the machine, and
• a winder for winding the filament at a rate of about 10 meters per minute.