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Resin plasticizing bad, may be inappropriate given: the heating zone temperature control instrument malfunction, resin mixed with different melt index and density of other relevant major resin: extruder factors such as low back pressure. Under the microscope (40 times), there is no melting point. The extrusion film is dark, opaque and viscous. The most effective way to determine malplasticization is to check under a microscope for non-molten materials.
In the case of fault treatment, the first method to eliminate the mixing of other resins in the resin is to measure the melting index, which is determined after comparing with the standard index. Then consider adjusting the temperature of each heating area to check the temperature controller. If the temperature controller in the heating zone is found to be heated all the time without reaching the given temperature, the screw speed can be reduced to achieve good plasticization. Increasing the back pressure of the extruder can increase the number of filter mesh, but too high back pressure will damage the screw thrust bearing of the extruder. For the failure of on-site temperature control, raw material and flow rate to achieve stable melt film and low production capacity, it is necessary to consider changing screw design and replacing high-efficiency screw.
