Suction control in a suction/blowing mold system
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United States of America Patent
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Apr 26, 2005
Grant Date -
Aug 9, 2001
app pub date -
Dec 13, 2000
filing date -
Dec 16, 1999
priority date (Note) -
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Abstract
A plastic hollow preform is drawn through a mold passage formed in a closed mold by applying a generally constant suction to a downstream end of a conduit having an upstream end connected to an output end of the mold passage. A flow cross section of the conduit is varied between its upstream and downstream ends so as to vary a rate at which the preform is drawn through the passage by the suction. The flow cross section is varied by displacing a valve element in the conduit between positions in which it differently blocks flow through the conduit.
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