Patent ID: 7267541
Filing Date: 2007-09-11
Classification: B29C

Abstract:
1. An extruder head for extrusion blow-molding plastic containers, comprising a ring gap nozzle having a mandrel and a ring-shaped nozzle body; an elastically deformable sleeve; and setting devices for radially deforming the elastic sleeve; whereby the sleeve arranged at the end on the nozzle outlet side defines an annular gap whose width is variable by axial setting motions of the mandrel and/or nozzle body, and whose geometry can be influenced by deforming the sleeve as a hose-shaped preformed blank is being extruded; and whereby the sleeve is radially movable on sliding surfaces supporting the sleeve in the upward and downward directions; characterized in that the sleeve arranged on the mandrel has a conical widening toward the upper end on the inlet side, and that the outside diameter of the sleeve measured on the upper face is larger than the outside diameter of the sleeve on the nozzle outlet; and that the wall profile of the sleeve and the height of the points of force application of the setting devices along the sleeve, said points of force application being located out of center in the longitudinal direction of the sleeve, are coordinated with one another in such a way that the upper face of the sleeve guided on a sliding surface of the mandrel maintains at least approximately its plane parallelism in relation to the sliding surface when the sleeve is deformed.