Methods and apparatus for multiple extrusion of plastics

Claim 1

A METHOD OF EXTRUDING SIMULTANEOUSLY AT LEAST TWO COATS OF DIFFERENT PLASTIC COMPOUNDS HAVING DIFFERENT EXTRUSION TEMPERATURES ON A COMMON CONDUCTIVE CORE, THE EXTRUSION TEMPERATURE OF AT LAST ONE OF THE COMPOUNDS BEING SUFFICIENTLY HIGH WITH RESPECT TO THE EXTRUSION TEMPERATURE OF THE OTHER COMPOUND SO THAT THE COMPOUND HAVING A LOWER EXTRUSION TEMPERATURE WOULD DETERIORATE IF SUBJECTED TO A RELATIVELY HIGH GEMPERATURE TO WHICH THE COMPOUND HAVING A HIGHER EXTRUSION TEMPERATURE IS SUBJECTED DURING WORKING AND CONDITIONING TO PERMIT UNIFORM EXTRUSION THEREOF, WHICH COMPRISES THE STEPS OF: WORKING AND CONDITIONING A FIRST PLASTIC COMPOUND HAVING A RELATIVE HIGH EXTRUSION TEMPERATURE, HEATING THE FIRST PLASTIC COMOUND TO A TEMPERATURE REQUIRED FOR UNIFORM EXTRUSION THEREOF AT A LOCATION SPACED SUBSTANTIALLY FROM AN EXTRUSION HEAD TO MINIMIZE THE EFFCTS OF HEAT TRANSFER TO THE EXTRUSION HEAD SO THAT A SECOND PLASTIC COMPOUND, WHICH HAS A LOWER MELTING TEMPERATURE THAN THE FIRST PLASTIC COMPOUND AND WHICH MAY BE IN THE EXTRUSION HEAD, IS NOT BURNED OR DETERIORATED, WORKING AND CONDITIONING THE SECOND PLASTIC COMPOUND HAVING A RELATIVELY LOW EXTRUSION TEMPERATURE, HEATING THE SEOND PLASTIC COMPOUND AT A REQUIRED TEMPERATURE SUBSTANTIALLY LOWER THAN THE REQUIRED TEMPERATURE OF THE FIRST PLASTIC COMPOUND AND AT A LOCATION SPACED SUBSTANTIALLY FROM THE LOCATION OF THE HEATING OF THE FIRST PLASTIC COMPOUND SO THAT ANY HEAT TRANSFER FROM THE HEATING LOCATION OF THE FIRST EXTRUSION HEAD, SECOND PLASTIC COMPOUND IS INSUFFICIENT TO BURN OR DETERIORATE THE SECOND PLASTIC COMPOUND, CONVEYING THE FIRST PLASTIC COMPOUND FROM THE HEATING LOCATION OF THE FIRST PLASTIC COMPOUND TO THE SPACED EXTRUSION HEAD, COOLING SIMULTANEOUSLY THE FIRST PLASTIC COMPOUND AS THE COMPOUND IS COVERED FROM THE HEATING LOCATION OF THE FIRST PLASTIC COMPOUND TO THE EXTRUSION HEAD WHILE MAINTAINING THE COMPOUND IN AN EXTRUDABLE CONDITION SO THAT OVERHEATING AND SCORCHING IS PREVENTED OF ANY OF THE SECOND PLASTIC COMPOUND, HAVING A SUBSTANTIALLY LOWER EXTRUSION TEMPERATURE, WHICH MAY BE IN THE EXTRUSION HEAD, DISCHARGING THE CONVEYED AND COOLED, WORKABLE, FIRST PLASTIC COMPOUND INTO THE EXTRUSION HEAD THROUGH A FIRST PASSAGE AND A FIRST EXTRUSION CHAMBER OF THE EXTRUSION HEAD IN A SUFFICIENTLY FLUID STATE FOR SMOOTH AND UNIFORM EXTRUSION OF THE FIRST COMPOUND IN A COATING ABOUT THE CONDUCTIVE CORE PASSING THROUGH THE FIRST CHAMBER, DISCHARGING THE WORKED AND CONDITIONED SECOND COMPOUND DIRECTLY FROM THE HEATING LOCATION OF THE SECOND COMPOUND THROUGH A SECOND PASSAGE AND A SECOND CHAMBER OF THE EXTRUSION HEAD IN A SUFFICIENTLY FLUID STATE FOR SMOOTH AND UNIFORM EXTRUSION ABOUT THE FIRST PLASTIC COATING EXTRUDED ONTO THE CONDUCTIVE CORE, AND HEATING THE CONVEYED FIRST PLASTIC COMPOUND DURING A PERIOD WHEN THE TWO COATS OF DIFFERENT PLASTIC COMPOUNDS ARE NOT BEING EXTRUDED ON THE CONDUCTIVE CORE TO MAINTAIN THE FIRST PLASTIC COMPOUND, BETWEEN AND THE EXTRUSION HEAD, IN A WORKABLE CONDITION.

Claim 2

A METHOD OF EXTRUDING SIMULTANEOUSLY AT LEAST TWO COATS OF DIFFERENT PLASTIC COMPOUNDS HAVING DIFFERENT EXTRUSION TEMPERATURES ON A COMMON CONDUCTIVE CORE, THE EXTRUSION TEMPERATURE OF AT LAST ONE OF THE COMPOUNDS BEING SUFFICIENTLY HIGH WITH RESPECT TO THE EXTRUSION TEMPERATURE OF THE OTHER COMPOUND SO THAT THE COMPOUND HAVING A LOWER EXTRUSION TEMPERATURE WOULD DETERIORATE IF SUBJECTED TO A RELATIVELY HIGH GEMPERATURE TO WHICH THE COMPOUND HAVING A HIGHER EXTRUSION TEMPERATURE IS SUBJECTED DURING WORKING AND CONDITIONING TO PERMIT UNIFORM EXTRUSION THEREOF, WHICH COMPRISES THE STEPS OF: WORKING AND CONDITIONING A FIRST PLASTIC COMPOUND HAVING A RELATIVE HIGH EXTRUSION TEMPERATURE, HEATING THE FIRST PLASTIC COMOUND TO A TEMPERATURE REQUIRED FOR UNIFORM EXTRUSION THEREOF AT A LOCATION SPACED SUBSTANTIALLY FROM AN EXTRUSION HEAD TO MINIMIZE THE EFFCTS OF HEAT TRANSFER TO THE EXTRUSION HEAD SO THAT A SECOND PLASTIC COMPOUND, WHICH HAS A LOWER MELTING TEMPERATURE THAN THE FIRST PLASTIC COMPOUND AND WHICH MAY BE IN THE EXTRUSION HEAD, IS NOT BURNED OR DETERIORATED, WORKING AND CONDITIONING THE SECOND PLASTIC COMPOUND HAVING A RELATIVELY LOW EXTRUSION TEMPERATURE, HEATING THE SEOND PLASTIC COMPOUND AT A REQUIRED TEMPERATURE SUBSTANTIALLY LOWER THAN THE REQUIRED TEMPERATURE OF THE FIRST PLASTIC COMPOUND AND AT A LOCATION SPACED SUBSTANTIALLY FROM THE LOCATION OF THE HEATING OF THE FIRST PLASTIC COMPOUND SO THAT ANY HEAT TRANSFER FROM THE HEATING LOCATION OF THE FIRST EXTRUSION HEAD, SECOND PLASTIC COMPOUND IS INSUFFICIENT TO BURN OR DETERIORATE THE SECOND PLASTIC COMPOUND, CONVEYING THE FIRST PLASTIC COMPOUND FROM THE HEATING LOCATION OF THE FIRST PLASTIC COMPOUND TO THE SPACED EXTRUSION HEAD, COOLING SIMULTANEOUSLY THE FIRST PLASTIC COMPOUND AS THE COMPOUND IS COVERED FROM THE HEATING LOCATION OF THE FIRST PLASTIC COMPOUND TO THE EXTRUSION HEAD WHILE MAINTAINING THE COMPOUND IN AN EXTRUDABLE CONDITION SO THAT OVERHEATING AND SCORCHING IS PREVENTED OF ANY OF THE SECOND PLASTIC COMPOUND, HAVING A SUBSTANTIALLY LOWER EXTRUSION TEMPERATURE, WHICH MAY BE IN THE EXTRUSION HEAD, DISCHARGING THE CONVEYED AND COOLED, WORKABLE, FIRST PLASTIC COMPOUND INTO THE EXTRUSION HEAD THROUGH A FIRST PASSAGE AND A FIRST EXTRUSION CHAMBER OF THE EXTRUSION HEAD IN A SUFFICIENTLY FLUID STATE FOR SMOOTH AND UNIFORM EXTRUSION OF THE FIRST COMPOUND IN A COATING ABOUT THE CONDUCTIVE CORE PASSING THROUGH THE FIRST CHAMBER, DISCHARGING THE WORKED AND CONDITIONED SECOND COMPOUND DIRECTLY FROM THE HEATING LOCATION OF THE SECOND COMPOUND THROUGH A SECOND PASSAGE AND A SECOND CHAMBER OF THE EXTRUSION HEAD IN A SUFFICIENTLY FLUID STATE FOR SMOOTH AND UNIFORM EXTRUSION ABOUT THE FIRST PLASTIC COATING EXTRUDED ONTO THE CONDUCTIVE CORE, AND HEATING THE CONVEYED FIRST PLASTIC COMPOUND DURING A PERIOD WHEN THE TWO COATS OF DIFFERENT PLASTIC COMPOUNDS ARE NOT BEING EXTRUDED ON THE CONDUCTIVE CORE TO MAINTAIN THE FIRST PLASTIC COMPOUND, BETWEEN AND THE EXTRUSION HEAD, IN A WORKABLE CONDITION.