How should the mold temperature be controlled when using different materials for co-extruded profiles?

How should the mold temperature be controlled when using different materials for co-extruded profiles?

When using profiles made by co-extrusion of different materials, the mold temperature is usually determined by the processing temperature of the main material. 
When the processing temperatures of several co-extruded materials differ significantly from that of the main material, the heating temperature of the first zone of the co-extrusion barrel should be strictly controlled. Especially when the main material is a PVC type material with poor thermal stability, if the temperature is too high, it is likely to cause the material viscosity to be too low, resulting in uneven discharge, or the material at the feed inlet of the mold adhering to the mold and being burned; if the temperature is too low, it is likely to cause the melt viscosity to be too high, poor fluidity, and poor coating with the main material. 
For large-sized products, since the molds are relatively large, heating temperature control devices should be added to the connecting components between the co-extrusion machine and the molds, which is beneficial for improving the quality of the co-extruded products.
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