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Film with Fish-eye, Arrows Lines and Coking Spots

Blown Film Extrusion Troubleshooting

Cause (s)	Possible Solution (s)
Improper operating in material exchange	Avoid overheating of the gels The new material should have a lower MI than the old material Clean the machine before exchanging the material
Melt temperature is too high or too low	Adjust the melt temperature Check the heater function
Raw materials contain impurities	Avoid dirt entering feed hopper Avoid using recycled materials
Uneven gels mix	Increase back pressure Use screw with a greater L/D Avoid existence of dead corner at extruder or die head

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