 |
|
Problem
|
|
Possible Cause
|
|
Possible Solution
|
|
|
Film Thickness not uniform
|
|
Non uniform lip setting
|
|
Adjust die gap
|
|
|
|
|
Die temperature variation
|
|
Modify die temperature profile
|
|
|
|
|
Uneven air flow from air ring assembly
|
|
Adjust air flow
|
|
|
Seams or streaks
|
|
Melt temp too low
|
|
Increase melt temp
|
|
|
Wrinkling during collapsing
|
|
Tube too cold and rigid
|
|
Increase barrel/die temperature
|
|
|
|
|
|
|
Increase line speed
|
|
|
|
|
Uneven cooling through air ring
|
|
Adjust air gap and velocity
|
|
|
|
|
Stabilizer system not properly balanced
|
|
Adjust bubble stabilizer system
|
|
|
Variable lay flat width
|
|
Unbalanced roll speed
|
|
Adjust roll speed
|
|
|
|
|
Stabilizer system not set properly
|
|
Adjust stabilizer system
|
|
|
|
|
Extrusion rate too high
|
|
Reduce through put rate
|
|
|
|
|
Frost line not positioned properly
|
|
Adjust processing temps and line speed
|
|
