Process for the injection molding of fluid-filled plastic bodies
AssigneeKlockner Ferromatik Desma GmbH
InventorChristoph Jaroschek
Life of this patent
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Abstract
The invention relates to a process for the injection molding of fluid-filled plastic bodies and a device to carry out this process, wherein a pressurized, flowable plastic melt is first injected by means of at least one nozzle into a mold cavity clamped by a two-part or multi-part mold until the mold cavity is completely filled. Next, after cooling of the plastic melt on the mold cavity walls has set in, a pressurized fluid is injected in such manner into the interior of the plastic melt located in the mold cavity that the still melted center of the resulting plastic body is expelled into at least one side cavity arranged outside the mold cavity and connected thereto.
Claims20
A process for the injection molding of fluid filled plastic bodies, comprising the steps of:
- injecting a pressurized, flowable plastic melt into an interior of a mold cavity defined by walls to completely fill the mold cavity;
- cooling part of the plastic melt along the walls, thereby providing an interior of flowable, plastic melt;
- then
- providing at least one side cavity in communication with the mold cavity;
- injecting a pressurized fluid into the interior of flowable, plastic melt formed by cooling part of the plastic melt along the walls;
- expelling the interior of flowable, plastic melt into the at least one side cavity via the injected pressurized fluid;
- and
- separating the flowable, plastic melt expelled into the at least one side cavity from the fluid filled plastic body in the mold cavity.
A process for the injection molding of fluid filled plastic bodies, comprising the steps of:
- providing a mold cavity having walls and an interior defined by said walls;
- injecting a pressurized, flowable plastic melt into the interior of the mold cavity to completely fill the mold cavity;
- providing at least one side cavity in communication with the mold cavity through a communication means;
- then
- cooling part of the plastic melt along the walls, thereby providing an interior of flowable, plastic melt;
- injecting a pressurized fluid into the interior of flowable, plastic melt formed by cooling part of the plastic melt along the walls;
- expelling the interior of flowable, plastic melt into the at least one side cavity via the injected pressurized fluid;
- and
- interrupting communication between the mold cavity and the side cavity with a means to selectively interrupt the communication means.
A process for the injection molding of fluid filled plastic bodies, comprising the steps of:
- providing a mold cavity having walls and an interior defined by said walls;
- providing at least one side cavity in communication with the mold cavity through a communication means;
- interrupting communication between the mold cavity and the side cavity with a means to selectively interrupt the communication means;
- injecting a pressurized, flowable plastic melt into the interior of the mold cavity to completely fill the mold cavity;
- cooling part of the plastic melt along the walls, thereby providing an interior of flowable, plastic melt;
- providing a communication between said mold cavity and said side cavity with said means to selectively interrupt the communication means;
- injecting a pressurized fluid into the interior of flowable, plastic melt formed by cooling part of the plastic melt along the walls;
- expelling the interior of flowable, plastic melt into the at least one side cavity via the injected pressurized fluid;
- and
- separating the flowable, plastic melt expelled into the at least one side cavity from the fluid filled plastic body in the mold cavity.
Dependencies are inferred from the claim text.