Extrusion head for blow molding

Details Extrusion head for blow molding Extrusion head for blow molding

1995-10-03

1997-04-15

Davis, Robert

Plastic article or earthenware shaping or treating: apparatus

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

Including means to prepare parison

2612098, 261541, 425380, 425465, 425467, B29C 4720, B29C 4904

Patent

active

056207220

ABSTRACT:
An extrusion head for extruding a polymer into a parison for blow molding and including a die ring and a mandrel. The die ring and mandrel each include a frustoconical portion. One frustoconical portion is shaped over its full length to define an ovalized annular outlet. The frustoconical portion is also shaped over less than its full length with a recess that is rotationally offset from the first and generally located upstream therefrom. The shapings result in the prison being extruded in a controlled manner through the outlet orifice with a predetermined area of increased thickness.

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