Apparatus for producing a preform for the manufacture of a hollo

Details Apparatus for producing a preform for the manufacture of a hollo Apparatus for producing a preform for the manufacture of a hollo

1991-06-24

1993-04-27

Chiesa, Richard L.

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

Extrusion shaping means

4251331, 425523, 425532, B29C 4706, B29C 4904

Patent

active

052060322

ABSTRACT:
An apparatus for producing a preform for the manufacture of a hollow body from thermoplastic material by extrusion blow molding has an extrusion head with a material-storage chamber which can be emptied by a piston to produce the preform. At its peripheral surface the piston has a groove-like recess providing a receiving passage which extends parallel to the direction of movement of the piston, for receiving plasticized material from the extruder connected to the extrusion head. Communicating with each of the two end regions of the receiving passage are respective duct systems through which respective flow portions of material from the extruder flow to the storage chamber.

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patent: 4937035 (1990-06-01), Richter
patent: 5004578 (1991-04-01), Eiselen

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