Centripetal extrusion method and apparatus therefor

Claim 1

AN EXTRUSION APPARATUS COMPRISING (A) A CASE MEMBER HAVING AN OPENING THEREIN, (B) A ROTATABLE PLATE MEMBER HAVING A SUBSTANTIALLY PLANAR SURFACE, (C) A STATIONARY PLATE MEMBER HAVING A SUBSTANTIALLY PLANAR SURFACE FIXEDLY ATTACHED TO SAID CASE MEMBER AND POSITIONED IN FRONT OF SIAD OPENING, SAID STATIONARY PLATE MEMBER HAVING AN EXTRUSION ORIFICE IN A PORTION THEREOF, THE PLANAR SURFACE OF SAID STATIONARY PLATE MEMBER BEING PARALLEL TO AND CLOSELY SPACED FROM SAID ORTATABLE PLATE PLANAR SURFACE, THEREBY DEFINING AN EXTRUSION CHANNEL, THE SPACING BETWEEN SAID PARALLEL PLATES BEING SUFFICIENT TO CAUSE VISCO-ELASTIC EXTRUSION OF PLASTIC MATERIALS FROM THE PERIPHERY OF SAID PLATES THROUGH SAID EXTRUSION ORIFICE BY RELATIVE ROTATION OF SAID PARALLEL PLATES ABOUT AN AXIS PASSING THROUGH SAID EXTRUSION ORIFICE AND SUBSTANTIALLY PERPENDICULAR TO SAID PLATES AT THE POINT, (D) MEANS FOR INTRODUCING INTO SAID SPACE BETWEEN SAID PARALEL SURFACES A PLASTIC MATERIAL, SAID INTRODUCING MEANS INCLUDING A FEED CHANNEL FORMED BY A SLANTING SURFACE ON SAID ROTATABLE MEMBER CIRCUMSCRIBING SAID PLANAR SURFACE ON SAID ROTATABLE MEMBER, SAID SLANTING SURFACE BEING INCLINED AWAY FROM SAID STATIONARY PLATE MEMBER PLANAR SURFACE AT AN OBLIQUE ANGLE THERETO, (E) SAID INTRODUCING MEANS ALSO INCLUDING A SECOND ORIFICE IN SAID CASING CONNECTED TO SAID FEED CHANNEL AT A FIRST POINT. (F) MEANS IN SAID FEED CHANNEL TO TAPER THE THICKNESS OF SAID FEED CHANNEL BETWEEN SAID FIXED PLATE PLANAR SURFACE AND SAID SLANTING SURFACE FROM SAID FIRST POINT TO A SECOND POINT IN SAID FEED CHANNEL SPACED A SUBSTANTIAL DISTANCE FROM SAID FIRST POINT, SAID MEANS IN SAID FEED CHANNEL MAINTAINING THE THICKNESS OF SAID FEED CHANNEL CONSTANT FROM SAID SECOND POINT TO A THIRD POINT IN SAID FEED CHANNEL SPACED FARTHER AROUND SAID ROTATABLE MEMBER PLANAR SURFACE TO THEREBY DEFINE SECTIONS IN SAID FEED CHANNEL OF INCREASING SHEAR AND CONSTANT SHEAR.