Extrusion head for extruding mouldings for roller blinds, frames, finish and the like

Claim 1

An extrusion head for extruding mouldings for roller blinds, standing finish and the like, comprising: at least one metal section feeding aperture defining an axis of the extrusion head; a first closed contour extrusion outlet coaxial with, and located externally of, said aperture; a second closed contour extrusion outlet coaxial with said aperture and said first outlet and arranged externally of said first extrusion outlet spaced apart therefrom: a first plastics material feed canalization in communication with said first extrusion outlet, said first canalization having an inlet length substantially perpendicular to said feeding aperture and defining a median plane substantially parallel to said axis, an intermediate length comprising two spaced apart channel branches of substantially elongated configuration in cross-section and arranged parallel to each other and to said median plane at two opposite sides thereof and spaced from said aperture, said channel branches opening with one end thereof into said inlet length and with another end thereof into said first extrusion outlet and having an elbow-like arcuate bend in an intermediate zone thereof thereby to direct said other end thereof coaxially to said first extrusion outlet; a core portion between and separating laterally said two channel branches from each other; a second plastics material feed canalization in communication with said second extrusion outlet, said second canalization having an input length substantially perpendicular to said feeding aperture and extending in said median plane in a juxtaposed position with respect to said inlet length, an intermediate extension of said second canalization comprising two spaced apart duct branches of substantially elongated configuration in cross-section and arranged parallel to each other and to said median plane externally to, and at two opposite sides of, said channel branches, said duct branches opening with one end thereof into said input length and with another end thereof into said second extrusion outlet and having an elbow-like arcuate bend in an intermediate zone thereof thereby to direct said other end thereof coaxially to said second extrusion outlet, the duct and the channel branches arranged at a same side with respect to said median plane defining between each other a respective intermediate body portion separating laterally said duct and channel branches from each other thereby to avoid interference therebetween.