pipe head technology

The product lines for mono- & multi- layer cross heads covers a range from 10 mm pipes up to 1200 mm for following applications:

• Steel pipe coating at high thru put
• PP protection layer
• Multilayer structure with adhesive, EVOH or PA as barrier

Conextru´s pipe head design based on following melt channel distribution system:

• Helical spiral distributor with high thru put capacity for single layer heads and for for co-extrusion heads as main layer
• Helical spiral distributor with low thru put capacity for thin coextruded layer
• Helical spiral distributor special designed for EVOH, Adhesive, PA and for all low viscosity polymers at low throughput capacity for thin layer in case of co-extrusion.
• Radial spiral distributor for low operation capacity as single layer head or up to 5 layer for co-extrusion in very short length and side feeding of melt or for thin coextruded outer layer

• Low shear rate even at high thru put to the melt: Leads to controllable process temperatures.
• Low volume and short residence time, short in total length: Leads to low thermal load to the material with short cleaning time.
• Low pressure built up: Leads to low melt temperature increase in the extruder and lower pump energy consumption.
• Best eccentricity and wall close wall distribution of main and coax layers: Leads to lower material use and savings in material cost.
• Short length die sets: Leads to smooth surface and less thermal stress.

• IPC – Internal Pipe Cooling: Leads to cooling length reduction up to 40 %.
• IHC – internal head cooling by air: Leads to stable temperatures during production at low operation cost.
• Horizontal die and mandrel change: Leads easy handling and time saving for tool change.

Add on die sets:

• Master die set always kept within centring unit, all other die sets mounted one by one to master die set: Leads short time for tool change and short start up time.
• Large diameter range for each die: A new die design makes 4 pipe dimensions diameters with 1 die possible.

• Thermal centring: Leads to uniform flow and low eccentricity.