Rotator, Die and Air Ring in PE Film Lines

Rotator, Die and Air Ring in PE Film Lines

  1. Is a record kept of screens used and date installed?
  1. Is the pressure gauge at the end of the barrel checked often? A high pressure indicates a filled screen and a low pressure indicates a blow-out.
  2. Are the die and air ring level and parallel to each other, with the air ring concentric with the die orifice?
  1. If the air ring is raised above the die face, is there any dirt between the die and the bottom of the ring? Dirt in this area can interrupt the air flow of melt and cause gauge bands in the film.
  1. Is there any dirt or contamination on the lips and venturi tube of the air ring?
  1. If die or air ring rotator drives are in use, are the switch rings and brushes required for full rotation regularly cleaned?
  1. Are the power and thermocouple wiring checked for freedom of movement and any scuffing, if rotating systems are in use?
  1. Is the air hose used to inflate the bubble removed before die rotation begins.