Problem Cause(s) Possible Solution(s)
Non-uniform film speed Unstable Die Head temperature Check the Heater function is normal
Check the Thermocouple position is correct
Die Head Throughput fluctuations Adjust the Die Gap
Regular cleaning of Die Head, Screw and Filter
Non-uniform cooling air volume Check Air Ring for dirt buildup or breakage
Adjust Air Ring position
Check whether Air Pipe is damaged
The air flow in the factory is too fast Do not let outdoor air directly enter the factory 
Extruder Throughput instability Cool down the hopper throat to avoid plastic blocking
Replace the strainer meshes of Filter to avoid blocking
Matter of the formula
Insufficient film strength Blow-Up Ratio Use a smaller Die Head to increase the Blow-Up Ratio
Improper Die design or scratches Clear Die impurities
Fix scratches on the Die Head
Avoid seams by design
Material cracking Change the material
Turn downffeating temperature
Inappropriate raw material formula Select raw materials with suitable Melt Index (MI)
Select compatible Additives
Uneven gels mix Use screw with a greater L/D
Adjust the melt temperature
Use multi-layer strainer meshes for Filter, or reduce the Die Gap, to improve back pressure
Insufficient film openness Improper film roll storage Avoid piling up 
Store in a well-ventilated place
Winding tension is too high Adjust the winding tension
Nip Roller pressure is too high Reduce Nip Roller pressure
Tubular film temperature is too high Increase cooling air volume of Air Ring
Use cold air cooling 
Reduce Die Head temperature
Equip Take-Up Roller with waterway 
Unsuitable material formula Add anti-phase adhesive or slippery agent
Film scratching or wrinkling Tubular film asymmetry or swing Adjust the air flow of Air Ring 
Avoid too fast air flow inside the factory
Use a hash-shape frame to steady the film
Inappropriate Nip Roller Align Nip Roller and keep it horizontally
Avoid Nip Roller damages
Improper Collapsing Frame Adjust Collapsing Frame angle
Adjust Collapsing Frame length
Reduce friction to Collapsing Frame
Uneven winding tension Adjust the winding angle
Die Head scratches Refinishing Die scratches
Film with fish-eye,
arrows lines and coking spots
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
Tubular film rupture Melt temperature is too high or too low Adjust the melt temperature
Improper use of additives Reduce color masterbatch
Reduce waste recycling rate
Insufficient melt mix Add more strainer meshes of Filter or reduce the Die Gap to increase back pressure
Use screw with a greater L/D
Non-smooth material feeding Clean Die Head and Screw & Barrel
Replace the strainer meshes of Filter to avoid blockage
Cool down the hopper
Remove raw materials impurities
 Cooling line too low Raise the cooling line
Poor film printability Inappropriate ink Choose the right ink
Improper use of additives Reduce the amount of additives
Use the appropriate surface lubricant
Insufficient corona treatment Increase the treatment voltage or wattage
Reduce the Take-Up speed
Narrow the gap of the electrode
Raise the electrode treatment temperature
Air humidity too high Reduce the air humidity