Injection molding of plastic materials

Claim 1

AN INJECTION MODLING DEVICE COMPRISING A HEATED CYLINDER HAVING AN INLET END AND AN OUTLET END THROUGH WHICH MOLTEN THERMOPLASTIC MATERIAL IS FORCED; A BREAKER PLATE CONTAINING A PLURSLITY OF AXIAL PASSAGEWAYS THERE THROUGH TO PROVUDE CONTINUOUS COMMUNICATION BETWEEN SAID INLET END AND SAIL OUTLET END OF SAID CYLINDER AND TO ALLOW ONLY MOLTEN MATERIAL TO PASS THERETHROUGH, MOUNTED IN SAID CYLINDER AND SLIDABLE PARALLEL WITH THE AXIS OF SAID CYLINDER; SEAT MEANS TO CONFINE THE SLIDING MOVEMENT OF SAID BREAKER PLATE WITHIN PREDETERMINED LIMITS; A NOZZLE MOUNTED IN THE OUTLET END OF SAID CYLINDER; HEATING MEANS MOUNTED AXIALLY IN SAID NOZZLE; AND MEANS TO ALLOW SAID BREAKER PLATE TO SLIDE TO SAID SEAT MEANS NEAREST THE NOZZLE WHEN MOLTEN MATERIAL IS FORCED THROUGH SAID CYLINDER SAID SAID NOZZLE AND TO RETURN SAID BREAKER PLATE TO SAID SEAT MEANS FURTHEST FROM SAID NOZZLE WHEN MOLTEN MATERIAL IS NOT BEING FORCED THROUGH SAID CYLINDER AND SAID NOZZLE.