Patent ID: 6447156
Filing Date: 2002-09-10
Classification: B29B,B29C

Abstract:
A mixing element for extruders with two co-rotating screws, having a central hole for keying to the shaft of the screw and an outer profile which can be produced as a result of the removal of material from a circular element along at least one arc of its outer portion by cutting performed by a point-like element rotating around a circle with a diameter equal to that of the circular element, the point-like element and the circular element rotating in the same direction and at the same speed, and the centers of the circular element and of the circle being spaced apart by a distance less than their diameter, the mixing element being characterized in that, during at least a portion of the cutting process, the distance between the centers of the circular element and of the circle is reduced so that the portion of the outer profile which is correspondingly cut includes a substantially straight-edged recessed portion.