Device for injection molding articles of plastics material which contain hollow spaces
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United States of America Patent
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Apr 20, 1999
Issued Date -
N/A
app pub date -
Feb 1, 1995
filing date -
Nov 1, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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