초록

An extruder barrel of a thermoplastic molding machine connected to an injection molding nozzle provided with a plurality of heat pipes distributed around the central bore of the nozzle, each of the heat pipes deriving its thermal input from the extruder barrel itself.

대표청구항 ▼

The combination comprising: (a) an extruder barrel of an injection molding machine having a bore through which molten plastic material is adapted to flow and to be ejected therefrom; (b) means for heating said extruder barrel and the plastic material therein to a predetermined desired operating temp

The combination comprising: (a) an extruder barrel of an injection molding machine having a bore through which molten plastic material is adapted to flow and to be ejected therefrom; (b) means for heating said extruder barrel and the plastic material therein to a predetermined desired operating temperature at which said plastic material is maintained in its molten state; (c) an injection nozzle separate and distinct from said extruder barrel and having a first end portion which extends for a substantial distance within and is in good thermal contact with said barrel, said nozzle having a central elongated bore, separate and distinct from the bore of said extruder barrel and adapted to receive said molten plastic material after it has been ejected from the bore of said extruder barrel and to discharge it into a mold; and (d) a plurality of heat pipes in the body of said nozzle, distributed around said central bore, one end of each of said heat pipes extending for a substantial distance within said first end portion of said injection nozzle, the rest of each of said heat pipe continuing substantially along the entire length of said central bore; (e) each of said heat pipes being free of any heat input except from said extruder barrel and the molten plastic material in said nozzle.