What causes the plastic brushed extruded film to be thin and uneven in the longitudinal direction?
Poor plasticization of the resin may be inappropriate for the temperature of each heating zone: the temperature controller fails, the resin is mixed with other resins with different melt index or higher density: the back pressure of the extruder is low. Under the microscope (40 times), the unmelted crystal spots were observed, and the extruded film was dark, opaque, and the viscous flow was unstable, causing the melt film to fluctuate. The most effective way to determine the poor plasticization is to check for unmelted materials under the microscope.
In the troubleshooting, the first method to exclude the resin from mixing with other resins is to measure the melt index and compare it with the standard index. Then consider adjusting the temperature of each heating zone and check the temperature controller. If the temperature controller of the heating zone is found to be heated and does not reach a given temperature, the screw speed can be reduced to achieve good plasticization. Properly increasing the back pressure of the extruder can be achieved by increasing the number of mesh screens, but excessive back pressure can cause damage to the thrust bearing of the extruder screw. For the inability to pass the on-site temperature control, raw material, flow rate to achieve stable film, and low production capacity, it is necessary to consider changing the screw design and replacing the high-efficiency screw.
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