초록 ▼

For the extrusion of a composite strip formed of two kinds of material two screw extruders are arranged one above the other. The lower extruder is horizontal while the upper extruder is inclined downwardly so that both extruders extrude through a common extruderhead. The extruderhead comprises a fix

For the extrusion of a composite strip formed of two kinds of material two screw extruders are arranged one above the other. The lower extruder is horizontal while the upper extruder is inclined downwardly so that both extruders extrude through a common extruderhead. The extruderhead comprises a fixed central portion having converging opposite faces and hinged upper and lower jaws on opposite sides of the central portion. Interchangeable insert plates are secured on opposite sides of the central portion of the extruderhead and on the inner faces of the upper and lower jaws. The insert plates are provided with cooperating channels to define the shape of the extruded strips and the portions of the strips which are formed, respectively, of material from the upper and lower extruders. The upper and lower jaws are movable hydraulically between a closed position for extrusion and an open position for cleaning and for changing the insert plates so that different shapes can be extruded and selected portions of the extruded shapes can be formed of different materials.

대표청구항 ▼

Extruder apparatus comprising an extruderhead having an inlet and an outlet and two screw extruders which converge at an acute angle to one another to feed material from both of said extruders to said head, said extruderhead comprising three parts, namely a wedge-shaped middle part which is fixed to

Extruder apparatus comprising an extruderhead having an inlet and an outlet and two screw extruders which converge at an acute angle to one another to feed material from both of said extruders to said head, said extruderhead comprising three parts, namely a wedge-shaped middle part which is fixed to said extruders and two outer parts which are disposed on opposite sides of said middle part and are hinged for movement between an open position and a closed position, said middle part having opposite outer faces which converge at an acute angle toward the outlet of said extruderhead and said outer parts having inner faces which face and are spaced from said opposite faces of said middle part, and insert plates removably mounted on and substantially covering said inner faces of said outer extruderhead parts and having channels on inner faces of said insert plates which define passages for extrusion of composite products of predetermined cross section formed partly of material from one of said extruders and partly of material from the other of said extruders when said hinged parts are in closed position, said insert plates being accessible for cleaning and for replacement when said hinged parts are in open position, and means operatively associated with said insert plates for positioning said insert plates on said outer extruderhead parts and for securing them removably in place on said outer extruderhead parts.