Apparatus for the production of blowmolded synthetic-resin bodie

Details Apparatus for the production of blowmolded synthetic-resin bodie Apparatus for the production of blowmolded synthetic-resin bodie

1977-03-14

1978-11-07

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

425466, B29D 2303

Patent

active

041243510

ABSTRACT:
A parison of thermoplastic material is extruded through a nozzle, preliminary to blowing, the parison being receivable in a closable blowmold. The portions of the parison which are clamped in the blowmold should have a uniform thickness and, to compensate for different degrees of stretch at various locations, the parison-producing nozzle head is formed with a plurality of flaps or rollers selectively displaceable into the thermoplastic stream to reduce the wall thickness of the emerging parison. According to the invention, the wall thickness of the parison is only partially reduced at predetermined locations about the periphery, during predetermined time intervals in the course of the parison-extrusion process.

REFERENCES:
patent: 2975472 (1961-03-01), Colombo
patent: 3748079 (1973-07-01), Moreno et al.
patent: 3947201 (1976-03-01), Ellwood
patent: 3989433 (1976-11-01), Furman

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