Method of injection moulding hollow preforms

Details Method of injection moulding hollow preforms Method of injection moulding hollow preforms

1975-06-23

1977-04-26

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 89, 264 97, 264102, 264DIG78, 425DIG60, 425DIG204, 425DIG209, B29C 1707, B29F 100

Patent

active

040201376

ABSTRACT:
In an injection moulding process for forming hollow preforms on a mandrel which is subsequently used as a blowing pin for blowing the preforms to the final shape in a blow mould separation of the preform from the mandrel during cooling of the preform from the injection temperature is prevented by applying a vacuum to the blowing channel in the mandrel before the injection pressure is released.

REFERENCES:
patent: 2790994 (1957-05-01), Carpot et al.
patent: 3351983 (1967-11-01), Grigull
patent: 3412186 (1968-11-01), Piotrowski
patent: 3882213 (1975-05-01), Uhlig

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