Patent ID: 6619834
Filing Date: 2003-09-16
Classification: B29B,D01G,Y10S,Y10T

Abstract:
A device for producing a mixture from chemically reactive plastic components and permeated with reinforcement fibers, comprising:a mixing head having a mixing chamber receiving chemically reactive plastic components for producing a plastic mixture; an outlet tube disposed downstream of the mixing chamber for receiving the plastic mixture; a cleaning piston reversibly displaceable in the outlet tube and having a central channel; a conveying unit for feeding a strand of natural fibers; and a cutting arrangement including an outer tube defining an axis and terminating in an outlet port, an inner guide tube receiving the strand of natural fibers from the conveying unit and surrounded by the outer tube at formation of a gas supply channel of ring-shaped cross section for conduction of compressed gas, the inner tube and the outer tube so configured as to form a ring nozzle, with the outer tube extending beyond a lower end of the inner tube for guiding the strand of natural fiber downstream of the ring nozzle, and a cutting mechanism having at least one knife element extending transversely to the axis of the outer tube and in shearing contact with an end surface of the outer tube when passing by the outlet port, and an exit tube arranged downstream of the knife element in communication with the central channel of the cleaning piston, wherein the knife element includes a knife disk which is driven about an axis in parallel relationship to the axis of the outer tube and has at least one kidney-shaped through-opening having at least one rounded area forming a cutting edge.