Insulated sprue bushing
AssigneeNils Helldin AB
InventorCarl E. Helldin
Life of this patent
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Abstract
A device useful for injection molding of thermoplastic material includes a sprue bushing. The sprue bushing, which may include a front piece, improves the possibilities to reduce the heat dissipation from the thermoplastic material to the material in and adjacent to the tip of the bushing and the wear of the material of the bushing is reduced. An insert bushing of ceramic material may also be present at the tip of the sprue bushing/front piece.
Claims17
A device useful for injection molding of thermoplastic material, comprising:
- a sprue bushing defining an outlet opening which is also adapted to be an inlet opening of a mold cavity;
- a ceramic bushing having defined therein a flow channel for thermoplastic material, wherein the ceramic bushing is arranged at the outlet opening of the sprue bushing, and is adapted to insulate the thermoplastic material in the flow channel and to reduce dissipation of heat from the thermoplastic material.
A device useful for injection moldinig of thermoplastic material, comprising:
- a sprue bushing including a front piece fixed to the sprue bushing defining an outlet opening;
- and
- a ceramic bushing having defined therein a flow channel for thermoplastic material, wherein the ceramic bushing is arranged at the outlet opening of the sprue bushing and is adapted to insulate the thermoplastic material in the flow channel and to reduce dissipation of heat from the thermoplastic material.
A devuce useful for injection molding of thermoplastic material, comprising:
- a sprue bushing including a front piece fixed to the sprue bushing defining an outlet opening;
- and
- a ceramic bushing having defined therein a flow channel for thermoplastic material, wherein the ceramic bushing is arranged at the outlet opening of the sprue bushing and is adapted to insulate the thermoplastic material in the flow channel and to reduce dissipation of heat from the thermoplastic material, and the front piece includes a bottom portion which is provided in direct contact with the mold when the device is inserted into the mold.
A device useful for injection molding of thermoplastic material, comprising:
- a sprue bushing defining an outlet opening which is also adapted to be an inlet opening of a mold cavity;
- a ceramic bushing having defined therein a flow channel for thermoplastic material, wherein the ceramic bushing is arranged at the outlet opening of the sprue bushing, and is adapted to insulate the thermoplastic material in the flow channel and to reduce dissipation of heat from the thermoplastic material, and the sprue bushing has a bottom portion formed of metallic material which is positioned against a mold when the device is inserted into the mold cavity.
Dependencies are inferred from the claim text.