or working action from point 23 on the feed screw because of the small clearance space between the feed screw and the barrel as point 23 moves past point a the clearance space increases dramatically at point a until point 26 of the core 13 is opposite point a during this moment of rotation the plasticizing or working action of the core 13 would be at a minimum and is designated in fig6 as the greatest amplitude on the curve between the two designated arrows a 39 as the feed screw continues to rotate counterclockwise the curve in fig6 from point a 39 to b shows a very slow increase in working until point 20 of the feed screw reaches point a wherein there is again the least clearance and the most working action thus fig6 represents the working action of the metering sections as it rotates with the maximum amount of shear and working on the compound occurring when the radial clearance space is the least such working of the material generates sufficient heat which provides the necessary plastication of the heat sensitive polymer compound as the material is moved along the metering section without overheating the material such metering section maintains the polymer compound in a plastic state in a homogeneous mix at a low temperature without overheating the ability to locate.