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Two kinds of changes in the process of plastic melt in extrusion

by:Kolysen     2021-02-03
Altogether out of each different materials need single extruder, there are two kinds of the process change, depends on the individual points, the melt flow together in feed piece of extrusion, the material flow in the incoming block merge into a single laminar melt flow, the incoming block is located in the adjacent to the upstream of extrusion die head. This method depends on the plastic melt high viscosity, in order to prevent the mixing layer through the extrusion die head. Each component layer velocity can be achieved by feeding head of valve control, and the cost of capital is relatively low. Alternative mold co-extrusion, using complex mould structure, which separate the melt path manifold decorated near the point where the die head export consolidation. Thickness and velocity of each layer can be controlled independently, and can also process has significant different viscosity and melting temperature of the polymer. The manifold co-extrusion die more capital and maintenance cost is very high.

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