Injection nozzle insulator assembly
AssigneeHusky Injection Molding, Ltd.
InventorFadi Fikani
Life of this patent
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Abstract
An injection molding nozzle having a nozzle tip insulator assembly affixed thereon comprised of an inner sleeve and an outer sleeve is disclosed. The inner sleeve is preferably made from a metal with relatively low thermal conductivity and the outer sleeve is preferably made from a compressible non-metal material that can withstand typical injection pressures and temperatures.
Claims36
An injection molding system having a fluid source in communication with at least one injection molding nozzle assembly inserted in a mold plate, said injection molding nozzle assembly comprising;
- a nozzle bushing having a first melt channel formed therein, said first melt channel in fluid communication with said fluid source,
- a nozzle tip having a second melt channel formed therein, said second melt channel in fluid communication with said first melt channel and a mold gate,
- a nozzle tip insulator assembly affixed adjacent said mold gate to said nozzle tip, said nozzle tip insulator assembly in sealing abutment with a gate wall and comprising;
- an inner sleeve in thermal communication with said nozzle tip,
- an outer sleeve affixed to said inner sleeve by a joining means located between said inner and outer sleeve,
- a shoulder protruding from said inner sleeve to restrain the movement of said outer sleeve, said shoulder located on said inner sleeve to direct a portion of loads applied to said outer sleeve into said nozzle tip thereby reducing tensile loads in said inner sleeve.
A nozzle tip insulator assembly comprising:
- an inner sleeve formed to fit around a nozzle tip,
- an outer sleeve provided on said inner sleeve and a joining means located between said inner and outer sleeve,
- a shoulder protruding from said inner sleeve to restrain the movement of said outer sleeve, said shoulder located to direct a portion of loads applied to said outer sleeve into said nozzle tip thereby reducing tensile loads in said inner sleeve.
An injection molding device for communication of a fluid to a mold comprising:
- a nozzle assembly in fluid communication with said mold, said nozzle assembly comprising:
- a nozzle tip through which said fluid passes;
- and
- a nozzle tip insulator assembly for thermally insulating said nozzle tip, said nozzle tip insulator assembly comprising:
- an inner sleeve formed to fit around said nozzle tip,
- an outer sleeve provided on said inner sleeve and a joining means located between said inner and outer sleeve,
- a shoulder protruding from said inner sleeve to restrain the movement of said outer sleeve, said shoulder located to direct a portion of loads applied to said outer sleeve into said nozzle tip thereby reducing tensile loads in said inner sleeve.
A method of thermally insulating an injection nozzle from a gate wall comprising the steps of:
- placing an outer sleeve over an inner sleeve such that said outer sleeve is retained on said inner sleeve by a shoulder that protrudes from said inner sleeve,
- placing said inner sleeve over a nozzle tip of said injection nozzle,
- placing said nozzle tip adjacent a mold cavity,
- heating said injection nozzle to an elevated temperature causing said injection nozzle to elongate and cause said outer sleeve to sealingly contact said gate wall and causing said outer sleeve to deform and become affixed to said inner sleeve.
Dependencies are inferred from the claim text.