Multiple extrusion die head

A multiple extrusion head for manufacturing parisons from thermoplastic material, comprising:

• a stationary arranged base frame,
• a multiple of extrusion heads arranged on the base frame, each extrusion head comprising:
• a material inlet for a material flow of plasticized material delivered by an extruder,
• a ring die for forming a tube-like layer of the parison, wherein the ring die is connected in fluid connection to the material inlet, and
• an outer die element and an inner die element are arranged coaxially to each other and forming an annular gap of the ring die, wherein at least one of the die elements is displaceable along an adjustment axis of the respective extrusion head for adjusting the gap width of the annular gap, as well as an adjustment element which is displaceable along a longitudinal axis of the multiple extrusion head and which is connected to the displaceable die elements of the extrusion heads,
• spring supports arranged between the base frame and the adjustment element, wherein the spring supports are supported in a biased manner against the base frame and the adjustment element, and
• a drive comprising a drive element displaceable along the longitudinal axis and connected to the adjustment element.

A multiple extrusion head for manufacturing parisons from thermoplastic material, comprising:

• a multiple of extrusion heads arranged on the base frame, each extrusion head comprising:
• a material inlet for a material flow of plasticized material delivered by an extruder,
• a ring die for forming a tube-like layer of the parison, wherein the ring die is connected in fluid connection to the material inlet, and
• an outer die element and an inner die element are arranged coaxially to each other and forming an annular gap of the ring die, wherein at least one of the die elements is displaceable along an adjustment axis of the respective extrusion head for adjusting the gap width of the annular gap, as well as an adjustment element comprising an adjustment plate axially guided relative to the base frame and displaceable along a longitudinal axis of the multiple extrusion head and which is connected to the displaceable die elements of the extrusion heads, and
• a first spring support element and a second spring support element arranged between and supported against the base frame and the adjustment element displaceably parallel to the longitudinal axis, and supported in a biased manner against the base frame and the adjustment element.