Method and device for the production of a fibre-reinforced plasticate

A method for the production of a fibre-reinforced plasticate by means of a single-screw extruder (1), having a cylinder (7) and a screw (8) mounted rotatably therein, wherein a plastic material (31) is fed via a first filling opening (10) in the cylinder (7) into the single-screw extruder (1) and is melted therein to a plastic melt, wherein remotely from the first filling opening (10) with regard to conveying, a mass flow dmF/dt of one or more endless fibre strands (23) is fed via a second filling opening (11) in the cylinder (7) into the single-screw extruder (1), wherein in the region of the second filling opening (11) the plastic material (31) is present as plastic melt, wherein the endless fibre strands (23) are introduced in dry state into the plastic melt and are impregnated with plastic melt, wherein the mixture of fibre strands and plastic melt is discharged as fibre-reinforced plasticate (32) from a nozzle (12) situated at the remote end of the cylinder (7) with regard to conveying, wherein the screw (8) is used which, remote from the second filling opening (11) with regard to conveying, has a screw geometry such that the fed endless fibre strands (23) exit from the nozzle (12) substantially undamaged and impregnated with plastic melt (29), wherein a mass flow dmS/dt of plastic melt exiting from the nozzle and a mass flow dmP/dt of fibre-reinforced plastic (32) exiting from the nozzle are present, wherein the mass flow dmF/dt and the mass flow dmS/dt are in a first ratio to one another, in which the endless fibre strands (6) exiting from the nozzle (12) are substantially completely impregnated with plastic melt, wherein this first ratio constitutes a first mass flow target ratio, which is kept substantially constant over predeterminable periods of time, and/or wherein the mass flow dmF/dt and the mass flow dmP/dt are in a second ratio to one another, in which the endless fibre strands (6) exiting from the nozzle (12) are substantially completely impregnated with plastic melt, wherein the second ratio constitutes a second mass flow target ratio which is kept substantially constant over predeterminable periods of time.