Blown-Film Trouble Shooting Guide

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