Suction control in a suction/blowing mold system

Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling fluid pressure in direct contact with molding...

Reexamination Certificate

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Details

C264S506000, C264S508000, C264S536000, C264S540000, C264S571000, C425S532000, C425S534000

Reexamination Certificate

active

06884374

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.

REFERENCES:
patent: 4865799 (1989-09-01), Sadr
patent: 5460771 (1995-10-01), Mitchell et al.
patent: 6089851 (2000-07-01), Lupke et al.
patent: 6655951 (2003-12-01), Kupper
patent: 63165118 (1988-07-01), None
patent: 04296524 (1992-10-01), None

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