Apparatus for multi-stage blow molding of hollow shaped articles

Details Apparatus for multi-stage blow molding of hollow shaped articles Apparatus for multi-stage blow molding of hollow shaped articles

1977-07-01

1979-08-21

Lazarus, Richard B.

Plastic article or earthenware shaping or treating: apparatus

Female mold and means to shape parison directly by internal...

Including means to prepare parison

425534, B29D 2303

Patent

active

041652134

ABSTRACT:
Synthetic thermoplastic parisons are extruded at a first station, transferred from the first station to a second station (by moving the extrusion machine, by moving the parison with a gripper or by moving the parison while it is confined in the cavity of a first open-and-shut mold) and converted into hollow blanks or preforms at the second station. The blanks are converted into shaped articles in the cavity of a second open-and-shut mold and the shaped articles are ejected from the second mold at a third station. The second mold can move between the second and third stations, or the blowing mandrel which cooperates with the first mold to convert parisons into blanks moves from the second to the third station to transfer the blanks from the second station into the second mold at the third station. In each instance, the mandrel which cooperates with the first mold to convert parisons into blanks also cooperates with the second mold to convert blanks into shaped articles.

REFERENCES:
patent: 3940225 (1976-02-01), Uhlig
patent: 3941542 (1976-03-01), Uhlig

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