Reason for longitudinal uneven of wiredrawing extrusion film

Resin plasticizing bad, may be inappropriate given: the heating zone temperature control cable instrument malfunction, resin mixed with different melt index and density of other relevant major resin: extruder factors such as low back pressure.Microscope (40 times) is not melt crystal point, squeeze film dark, opaque, viscous flow instability, caused by melting membrane volatility.Concluded that is the most effective way of plasticizing bad microscope check whether did not melt. The fault handling, you exclude resin is mixed with other resin method in melt index determination, and to determine standard index after comparison.

Then consider to adjust the temperature of the heating area, check the temperature controller.If it is found that the heating zone temperature controller has been heated and reach the given temperature, can reduce the screw rotation speed to achieve the goal of plasticizing good.Appropriate increase extruder back pressure, can increase the screen mesh to achieve, but high back pressure will cause the extruder screw thrust bearing damage.For through the temperature control, raw material, the flow to achieve fusion membrane stability, and production capacity and low, consider to change the screw design, replace the high efficiency screw.