Patent ID: 8840389

Claim:
An extrusion device, in particular for plastic materials, comprising: an extrusion head having a nozzle for ejection of at least one plastic material; a first duct formed in said head for feeding a first plastic material to said ejection nozzle; and a second duct formed in said head for feeding a second plastic material to said ejection nozzle; a selection element, disposed in the vicinity of said ejection nozzle and suitable for carrying out switching between a first operating condition at which it closes the second duct to enable feeding of the first plastic material through the first duct, and a second operating condition at which it closes the first duct for enabling feeding of the second plastic material through the second duct; said selection element comprising a substantially cylindrical body rotatably inserted in a cavity of the extrusion head and an actuator operatively associated with said cylindrical body for rotation of said body about a respective longitudinal axis between the first and second operating conditions; and a common end stretch of said first and second ducts located in the vicinity of said election nozzle and formed in said selection element, said common end stretch being defined by at least one groove formed in an outer wall of said cylindrical body, at a respective end close to the ejection nozzle.