Back to results
US 5,208,052 AGranted
Hot runner nozzle assembly
AssigneeHusky Injection Molding Systems Ltd.
InventorsHarald Schmidt, Fong F. Sit
Life of this patent
Estimating the term…
Abstract
Hot runner nozzle assembly including a mold assembly with a mold cavity therein, an inlet port in the mold assembly communicating with the mold cavity, an injection nozzle for delivering molten resin to the inlet port and an insulating sleeve positioned around the nozzle between the mold assembly and nozzle insulating the nozzle from the mold assembly.
Claims14
Hot runner nozzle assembly which comprises:
- a mold assembly including a mold cavity defined therein;
- an inlet port in said mold assembly communicating with the mold cavity;
- an injection nozzle for delivering molten resin through said inlet port having a nozzle tip with an opening therein aligned with said inlet port, said nozzle tip defining a resin space adjacent said nozzle tip opening;
- an insulating sleeve positioned around said injection nozzle between the mold assembly and the injection nozzle insulating the injection nozzle from the mold assembly including a first downstream contact site between the sleeve and injection nozzle adjacent the resin space, a second upstream contact site between the sleeve and injection nozzle spaced from the first contact site, and an air space between the sleeve and injection nozzle separating the first and second contact sites;
- means adjacent the injection nozzle for heating the nozzle;
- and
- an insulating air gap between the injection nozzle and mold assembly;
- whereby there is substantially no contact between the injection nozzle and mold assembly so that the mold assembly may be cooled while the injection nozzle may be maintained at molding temperature and whereby on heating the injection nozzle expands against the insulating sleeve causing the sleeve to deflect.
5 more elements
Dependencies are inferred from the claim text.