Extruder head

Abstract

An extruder head for supplying tubular parisons to a blow molding machine has a cylindrical outer housing, an inner housing extending into the rear end portion of the outer housing, a core which defines with the outer housing an annular extrusion orifice and an annular compartment which supplies plasticized synthetic thermoplastic material to the orifice, and a holder which secures the core to the inner housing so that plasticized material can flow from an axially extending channel of the inner housing into the rear portion of the compartment between the core and the outer housing. The holder has a cupped section between the core and the inner housing, a first annulus of bolts which connect the section to the inner housing and a second annulus of bolts which connect the section to the core. The section has a central opening and the bolts are parallel to the axis of the core. Some plasticized material which is supplied by the channel flows radially outwardly through a rear chamber between the inner housing and the core whereby such material flows through the gaps between neighboring bolts of the first annulus and toward and into the compartment. The remainder of the material which is supplied by the channel flows from the rear chamber through the opening of the section and thereupon readially outwardly through a front chamber between the section and the core whereby such material passes through gaps between neighboring bolts of the second annulus before it reaches the compartment.

Dependencies are inferred from the claim text.