초록 ▼

The process and apparatus includes a die assembly having a die cavity defined therein and an inlet port in the die assembly communicating with the die cavity. An injection nozzle is provided for delivering molten synthetic resin to the die cavity through the inlet port having an opening aligned with

The process and apparatus includes a die assembly having a die cavity defined therein and an inlet port in the die assembly communicating with the die cavity. An injection nozzle is provided for delivering molten synthetic resin to the die cavity through the inlet port having an opening aligned with the inlet port and a thermally insulating sleeve positioned around the injection nozzle having an elastically yieldable component and a rigid component.

대표청구항 ▼

Apparatus for hot runner injection molding which comprises: a die assembly including a die cavity defined therein; means defining an inlet port in said die assembly communicating with said die cavity; an injection nozzle for delivering molten resin to said die cavity through said inlet port having a

Apparatus for hot runner injection molding which comprises: a die assembly including a die cavity defined therein; means defining an inlet port in said die assembly communicating with said die cavity; an injection nozzle for delivering molten resin to said die cavity through said inlet port having an opening aligned with said inlet port; and a thermally insulating sleeve positioned around said injection nozzle insulating said injection nozzle from said die assembly having a first elastically yieldable component and a second rigid component wherein said first and second components are in contacting relationship with each other and wherein said first component does not melt or degrade at the operating temperatures of the nozzle, whereby there is no contact between the die assembly and injection nozzle so that the die assembly may be cooled while the nozzle may be maintained at molding temperature and insulated therefrom, and wherein said first component is operative to provide a contact seal between the injection nozzle and the die assembly and wherein the second component is a separate element which backs up the first component and is operative to accomodate the expansion of the nozzle.