Part ejection system for injection molding apparatus
AssigneeSabic Global Technologies B.V.
InventorsHyemin Park, Jong-Min Choi
Life of this patent
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Abstract
A method for forming a part in an injection mold includes heating a polymer material to a temperature greater than or equal to a polymer glass transition temperature; injecting the polymer material into the injection molding apparatus of any of the preceding claims while pressing together the stationary half mold surface and the moving half mold surface to form the molding cavity; cooling a surface of the molding cavity with the cooling system; separating the stationary half mold surface and the moving half mold surface; and moving the ejection block relative to the stationary half thereby pushing the part away from the stationary half molding surface and ejecting the part from the injection molding apparatus.
Claims20
An injection molding apparatus comprising:
- a stationary half comprising:
- a sprue opening extending through a thickness of the stationary half forming a sprue passage;
- a stationary half mold surface;
- and
- an ejection block cavity disposed adjacent to the sprue opening;
- a moving half disposed opposite the stationary half and comprising a moving half mold surface, wherein the stationary half mold surface and the moving half mold surface face one another;
- a presser in mechanical communication with, and configured to move, the stationary half, the moving half, or both together to form a molding cavity between the stationary half mold surface and the moving half mold surface;
- an ejection block comprising a mold contact surface forming a portion of the stationary half mold surface, wherein at least a portion of the ejection block is disposed within the ejection block cavity, and wherein the ejection block is configured to movably fit within the ejection block cavity;
- and
- an injector for introducing a material to be molded through the sprue passage and into the molding cavity;
- and
- a cooling system in thermal communication with at least one of the stationary half mold surface and the moving half mold surface for cooling the material during or after it is introduced into the molding cavity.
A method for forming a part in an injection mold comprising:
- heating a polymeric material to a temperature greater than or equal to a polymer glass transition temperature;
- injecting the polymeric material into the injection molding apparatus while pressing together the stationary half mold surface and the moving half mold surface to form the molding cavity, wherein the injection molding apparatus comprises
- a stationary half comprising:
- a sprue opening extending through a thickness of the stationary half forming a sprue passage;
- a stationary half mold surface;
- and
- an ejection block cavity disposed adjacent to the sprue opening;
- a moving half disposed opposite the stationary half and comprising a moving half mold surface, wherein the stationary half mold surface and the moving half mold surface face one another;
- a presser in mechanical communication with, and configured to move, the stationary half, the moving half, or both together to form a molding cavity between the stationary half mold surface and the moving half mold surface;
- an ejection block comprising a mold contact surface forming a portion of the stationary half mold surface, wherein at least a portion of the ejection block is disposed within the ejection block cavity, and wherein the ejection block is configured to movably fit within the ejection block cavity;
- and
- an injector for introducing a material to be molded through the sprue passage and into the molding cavity;
- and
- a cooling system in thermal communication with at least one of the stationary half mold surface and the moving half mold surface for cooling the material during or after it is introduced into the molding cavity;
- cooling a surface of the molding cavity with the cooling system;
- separating the stationary half mold surface and the moving half mold surface;
- and
- moving the ejection block relative to the stationary half thereby pushing the part away from the stationary half molding surface and ejecting the part from the injection molding apparatus.
Dependencies are inferred from the claim text.