Device for feeding granulate and filler material to an extruder screw of an extruder

A method for returning plastic waste accumulating in an extrusion process, in particular edge strips, into an extruder having an extruder screw (11), wherein said method comprises:

• engaging the plastic waste, after its accumulation, by mechanical means, transporting the engaged plastic waste into a size reduction device, shredding the plastic waste, and thereafter feeding the shredded plastic waste with fresh granulate to the extruder screw (11) in a device comprising
• a cyclone (12),
• a cyclone inlet opening for introducing a delivery flow of pneumatically delivered filler material into the cyclone (12),
• a cyclone outlet opening (16) from the cyclone (12) for discharging the filler material which has been separated from the delivery flow,
• a feed funnel (1) for introducing fresh granulate,
• an outlet region (6) to the feed funnel (1), wherein the outlet region (6) annularly surrounds the cyclone outlet opening (16),
• a mixing section (9) to receive filler material and fresh granulate from the feed funnel (1), wherein the mixing section (9) axially adjoins the cyclone outlet opening (16), and
• a stuffing screw
• wherein the cyclone (12) is disposed at least partially in the feed funnel (1) and coaxial with the latter, so that the cyclone outlet opening (16) extends into outlet region (6), and the stuffing screw (19) passes axially through the cyclone outlet opening (16) and protrudes into the mixing section (9).