Hot Runner Melt Pre-Compression
AssigneeHusky Injection Molding Systems Ltd.
InventorsTiemo Dietmar BRAND, Nenad MILJKOVIC
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Abstract
Disclosed, amongst other things, is: an injection molding runner system, an injection molding method for operation of a runner system, and an injection molding machine amongst other things. The runner system includes a geometrically unbalanced melt distribution network and a means for pre-pressurizing of the molding material within the melt distribution network.
Claims28
An injection molding method for operation of a runner system having a geometrically unbalanced melt distribution network controllably fluidly connecting an injection mold to a source of molding material, the injection molding method comprising:
- pre-compressing the molding material within the geometrically unbalanced melt distribution network prior to an opening of the fluid connection with the injection mold to store potential energy in the molding material.
The injection molding method according to claim 2, wherein:
- the geometrically unbalanced melt distribution network defines:
- a first melt flow length to a first injection nozzle;
- a second melt flow length to a second injection nozzle;
- the first and second melt flow lengths are of unequal length;
- the runner system further including:
- a first valve structure configured to control a flow of the molding material through the first injection nozzle;
- a second valve structure configured to control a flow of the molding material through the second injection nozzle;
- wherein the injection molding method further comprises:
- positioning the first and second valve structures in a blocking configuration to prevent flow of the molding material through the first and second injection nozzles during pre-pressurizing of the melt distribution network;
- positioning the first and second valve structures into an open configuration to permit flow of the pre-pressurized molding material through the first and second injection nozzles and convert a portion of the potential energy into kinetic energy;
- injecting the molding material to fill molding cavities associated with a respective one of the first and the second injection nozzle;
- and
- positioning the first and second valve structures into the blocking configuration.
An injection molding runner system to fluidly connect an injection mold to a source of molding material, the runner system comprising:
- a geometrically unbalanced melt distribution means for controllably fluidly connecting an injection mold to a source of molding material;
- a melt pre-compression means for pre-compressing the molding material within the geometrically unbalanced melt distribution means prior to an opening of the fluid connection with the injection mold to store potential energy in the molding material.
An injection molding runner system that includes a melt distribution network defining at least two gates, comprising:
- a means for distributing a melt along a first melt flow length and a second melt flow length being, the first and second melt flow lengths being of unequal length;
- a means for pre-compressing the melt along the first melt flow length and the second melt flow length prior to opening at least one of the at least two gates.
Dependencies are inferred from the claim text.