Injection molding system for producing fiber-reinforced plastics material parts, comprising - an injection molding device with -- a first housing, -- a first housing bore formed in the first housing, -- a first feed opening for feeding plastics material into the first housing bore, -- a screw shaft for melting and introducing the plastics material into a mold, which is arranged in the first housing bore and is rotatably drivable about an associated first rotational axis, -- a second feed opening for feeding fibers into the first housing bore, -- a discharge opening for discharging the plastics material and the fibers from the first housing bore into the mold, and - a feed device for feeding the fibers into the plastics material located in the injection molding device,the feed device being configured in such a way that cut fibers are feedable through the second feed opening into the first housing bore, characterized in that the feed device comprises: - a multi-shaft screw machine with -- a second housing, -- a plurality of second housing bores (43, 44) penetrating one another, -- a plurality of feed screw shafts (45, 46), which are concentrically arranged in the second housing bores (43, 44) and are rotatably drivable about associated second rotational axes (49, 50), -- a fiber feed opening for feeding the fibers into the second housing bores (43, 44), and -- a fiber discharge opening for discharging the fibers from the second housing bores (43, 44), a suction mechanism for sucking the fibers through the fiber feed opening into the second housing bores (43, 44) by means of an air stream, and - a filter mechanism arranged between the suction mechanism and the second housing bores (43, 44) for filtering the fibers out of the air stream, wherein the filter mechanism forms a plurality of flow channels, which, in a flow direction of the air stream, in each case have a widening flow cross section. - an injection molding device with -- a first housing, -- a first housing bore formed in the first housing, -- a first feed opening for feeding plastics material into the first housing bore, -- a screw shaft for melting and introducing the plastics material into a mold, which is arranged in the first housing bore and is rotatably drivable about an associated first rotational axis, -- a second feed opening for feeding fibers into the first housing bore, -- a discharge opening for discharging the plastics material and the fibers from the first housing bore into the mold, and -- a first housing, -- a first housing bore formed in the first housing, -- a first feed opening for feeding plastics material into the first housing bore, -- a screw shaft for melting and introducing the plastics material into a mold, which is arranged in the first housing bore and is rotatably drivable about an associated first rotational axis, -- a second feed opening for feeding fibers into the first housing bore, -- a discharge opening for discharging the plastics material and the fibers from the first housing bore into the mold, and - a feed device for feeding the fibers into the plastics material located in the injection molding device,the feed device being configured in such a way that cut fibers are feedable through the second feed opening into the first housing bore, characterized in that the feed device comprises: - a multi-shaft screw machine with -- a second housing, -- a plurality of second housing bores (43, 44) penetrating one another, -- a plurality of feed screw shafts (45, 46), which are concentrically arranged in the second housing bores (43, 44) and are rotatably drivable about associated second rotational axes (49, 50), -- a fiber feed opening for feeding the fibers into the second housing bores (43, 44), and -- a fiber discharge opening for discharging the fibers from the second housing bores (43, 44), a suction mechanism for sucking the fibers through the fiber feed opening into the second housing bores (43, 44) by means of an air stream, and -- a second housing, -- a plurality of second housing bores (43, 44) penetrating one another, -- a plurality of feed screw shafts (45, 46), which are concentrically arranged in the second housing bores (43, 44) and are rotatably drivable about associated second rotational axes (49, 50), -- a fiber feed opening for feeding the fibers into the second housing bores (43, 44), and -- a fiber discharge opening for discharging the fibers from the second housing bores (43, 44), a suction mechanism for sucking the fibers through the fiber feed opening into the second housing bores (43, 44) by means of an air stream, and - a filter mechanism arranged between the suction mechanism and the second housing bores (43, 44) for filtering the fibers out of the air stream, wherein the filter mechanism forms a plurality of flow channels, which, in a flow direction of the air stream, in each case have a widening flow cross section.