Device for injection molding articles of plastics material which contain hollow spaces
AssigneeBattenfeld GmbH
InventorsHelmut Eckardt, Jurgen Ehritt, Michael Renger
Life of this patent
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Abstract
A device for injection molding articles of plastics material having hollow spaces. The device includes a molding tool with a mold cavity. Plastics material melt is fed to the mold cavity through a nozzle. Another pressurized medium is supplied to the mold cavity through a hollow needle at a location different from the location of the nozzle. A needle core is mounted in the hollow needle. The needle core is axially displaceable within certain limits. The opening of the hollow needle to the mold cavity can be opened and closed or its cross-sectional area can be varied by moving the needle core.
Claims14
A device for injection molding articles of plastics material having hollow spaces, comprising:
- a molding tool having a mold cavity and an opening for introducing a plastics material melt into the mold cavity;
- and
- means for introducing a pressurized medium into the plastics material melt filling the mold cavity for forming a hollow space within an injection molded body of an injection molded article, said introducing means comprising:
- a hollow needle for extending into the mold cavity at a location spaced from the introducing opening;
- and
- a needle core mounted within the needle for a limited axial displacement relative thereto and defining therewith, at a free end of the needle extendable into the plastics material melt, a variable size outlet opening for introducing the pressurized medium into the plastics material melt and having a dimension preventing a flow of the plastic material melt therethrough.
Dependencies are inferred from the claim text.