Injection blow molding with preliminary injection blow mold

Details Injection blow molding with preliminary injection blow mold Injection blow molding with preliminary injection blow mold

1976-04-12

1977-03-15

Lazarus, Richard B.

Plastic article or earthenware shaping or treating: apparatus

Dough divider type including trap chamber

Rotating trap chamber pickup

425DIG209, 425DIG215, B29C 1707

Patent

active

040121879

ABSTRACT:
This improvement in injection blow molding apparatus applies means for blowing a parison while it is still in an injection mold cavity and after sucking back a small portion of the injected material. The possible blowing is very slight, but it causes the parison to remain in contact with the injection mold cavity wall as it shrinks and draws away from much of the surface of the core rod to which the parison is applied by the injection process. This prevents parisons from sticking to the core rod and producing non-uniform results during the subsequent blowing operation in the blowing mold.

REFERENCES:
patent: 3345687 (1967-10-01), Marx
patent: 3709644 (1973-01-01), Farrell

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