Inline method for producing a spring strip profile for a slatted frame

An inline method for producing a spring strip profile for a slatted frame, wherein the spring strip profile comprises at least one core strand of a fiber-reinforced plastic and at least one thermoplastic cover layer surrounding the core strand, said method comprising:

• combining a plurality of fibers, threads and/or filaments into a fiber bundle;
• impregnating the fiber bundle with a thermally activatable reaction resin;
• shaping an outer contour of the fiber bundle impregnated with the reaction resin;
• thermally activating the reaction resin in a heating path to form a thermosetting core strand;
• inserting the core strand into an extruder head;
• applying thermoplastic melt in the extruder head to a cover layer on the core strand;
• cooling and calibrating the spring strip profile in a cooling and calibrating device;
• in a winding machine, forming at least one wrapped outer layer by wrapping the outer contour of the fiber bundle with at least one additional thread or filament fed laterally to the fiber bundle;
• and
• in the heating path, prior to insertion of the core strand into the extruder head, at least partially curing the reaction resin, at least in the wrapped outer layer of the fiber bundle;
• and wherein the throughput time of the core strand between a beginning of the thermal activation and an end of the cooling and calibration is shorter than a reaction time required for full curing across an entire cross-section of the core strand, and a throughput rate of the core strand is at least 4 meters/min.