Homogenizing device for thermoplastic materials worked in extrusion machines and the like

Claim 1

IN THE HOMOGENIZING APPARATUS FOR FLOWABLE PLASTIC MATERIAL, A TUBULAR MEMBER HAVING A LONGITUDINAL CURVILINEAR INTERNAL CONTOUR, A MANDREL POSITIONED WITHIN SAID TUBULAR MEMBER IN SPACED RELATION THERETO AND HAVING A LONGITUDINAL EXTERNAL CURVILINEAR CONTOUR, SAID INTERNAL CONTOUR AND EXTERNAL CONTOUR FORMING A CHANNEL OF VARYING RADIAL DEPTH THEREBETWEEN EXTENDING SUBSTANTIALLY THE FULL LENGTH OF SAID TUBULAR MEMBER AND SAID MUNDREL, AN INTAKE GRID MOUNTED AT ONE END OF SAID TUBULAR MEMBER, A DISCHARGE DIE MOUNTED AT THE OTHER END OF SAID TUBULAR MEMBER, THE LONGITUDINAL POSITION OF THE POINTS OF MAXIMUM DIAMETER OF SAID CURVILINEAR CONTOUR OF SAIDD TUBULAR MEMBER ALONG ITS LENGTH CORRESPONDING TO THE POINTS OF MAXIMUM DIAMETER OF SAID MANDREL ALONG ITS LENGTH, AND THE LONGITUDINAL POSITIONS OF THE POINTS OF MINIMUM DIAMETER OF SAID CURVILINEAR CONTOUR OF SAID TUBULAR MEMBER ALONG ITS LENGTH CORRESPONDING TO THE POINTS OF MINIMUM DIAMETER OF SAID CURVILINEAR CONTOUR OF SAID MANDREL ALONG ITS LENGTH, THE DIMENSIONS OF SAID CURVILINEAR CONTOURS OF SAID TUBULAR MEMBER AND SAID MANDREL AT SUCCESSIVE POINTS ALONG THE LENGTH THEREOF BEING SO DETERMINED THAT THE NUMERICAL VALUE OF THE RADIAL TRANSVERSE CROSS-SECTIONAL AREA OF THE CHANNEL BETWEEN SAID CONTOURS IS SUBSTANTIALLY CONSTANT ALONG THE ENTIRE LENGTH OF SAID TUBULAR MEMBER AND SAID MANDREL.