BackRemedies for Low Density Polyethylene (LDPE) film production faults

Problem Variables in order of importance Possible solutions
SPLITTY FILM - MD 3, 6, 26, 1, 39
  1. INCREASE BLOW - UP - RATIO
  2. REDUCE BLOW - UP - RATIO
  3. INCREASE NECK LENGTH
  4. REDUCE NECK LENGTH
  5. INCREASE MELT TEMPERATURE
  6. REDUCE MELT TEMPERATURE
  7. CLEAN AIR RING
  8. REDUCE FEED SECTION WATER TEMP
  9. INCREASE FEEDSECTION WATER TEMP
  10. SCREEN PACK TOO TIGHT (OR DIRTY) - USE 40/60/40
  11. REDUCE WINDER TENSION
  12. INCREASE COLLAPSER WIDTH
  13. REDUCE COLLAPSER WIDTH
  14. INCREASE COLLAPSING HEIGHT
  15. REDUCE COLLAPSING HEIGHT
  16. INCREASE DIE BODY TEMPERATURE
  17. REDUCE DIE BODY TEMPERATURE
  18. INCREASE DIE LIP TEMPERATURE
  19. REDUCE DIE LIP TEMPERATURE
  20. LEVEL DIE AND/OR AIR RING
  21. REDUCE OR ELIMINATE AIR DRAFTS
  22. STABILIZER/IRIS NOT CENTERED
  23. STABILIZER/IRIS TOO TIGHT
  24. COLLAPSING FRAMES NOT EVEN
  25. CHECK ALIGNMENT OF ENTIRE LINE
  26. INCREASE AIR RING VELOCITY
  27. REDUCE AIR RING VELOCITY
  28. CHECK DRIVE ADJUSTMENTS & TACH
  29. REDUCE OUTPUT (SCREW SPEED)
  30. INCREASE OUTPUT (SCREW SPEED)
  31. CHECK CONCENTRATE COMPATIBILITY
  32. NIPS NOT PARALLEL TO DIE
  33. CLEAN DIE
  34. DIE DAMAGED
  35. DIE FLOW DISTRIBUTION PROBLEM
  36. INCREASE UPSTREAM ZONES
  37. MOLECULAR WEIGHT TOO LOW
  38. INCREASE DIE GAP
  39. REDUCE DIE GAP
  40. CALL RESIN MANUFACTURER
SPLITTY FILM - TD 4, 27, 5, 38
BUBBLE INSTABILITY - VERTICAL 29, 27, 1, 40
BUBBLE INSTABILITY - LATERAL 6, 27, 4, 37, 40
POOR BUBBLE SHAPE 3, 6, 23, 30, 26, 39, 1
FILM BLOCKING 14, 6, 26
STRIPES IN FILM 16, 31, 33, 34, 35, 40
MELT FRACTURE 18,5, 31, 33, 38, 40
INHOMOGENOUS FILM STRUCTURE 6, 5, 31, 18, 40
SMILE WRINKLES ACROSS WEB 14, 13, 6
WRINKLES IN MACHINE DIRECTION 15, 12, 23, 5
EXCESSIVE BUBBLE BREAKS 10, 6, 31, 33, 40
EXCESSIVE GAUGE VARIATION 6, 16, 7, 21, 24, 23, 22, 20, 32, 33, 34, 35, 25
TAPERED ROLLS 20, 21, 24, 32, 22, 25
NON - UNIFORM ROLL HARDNESS 16, 7, 6, 24, 23, 22, 33, 34, 35, 31
NON - UNIFORM ROLL EDGES 6, 4, 27, 21, 23, 29, 37, 40
EXCESSIVE BACK PRESSURE 10, 16, 29, 33
HIGH MELT TEMPERATURE 10, 9, 26, 29
DRIVE AMPS FLUCTUATION 8, 28, 6
DRIVE AMPS AND PRESSURE VARIATION 8, 6, 31, 28
DIE LIP BUILD - UP 6, 19, 31, 40
POOR PIGMENT DISPERSION 31,6, 33, 34, 16
CONROL ZONE OVERRIDE 36, 29, 4
OUTPUT LOW (LOSS OF FEED ) 8, 6, 9
CRUSHED CORES 11,6, 14
LOW DART IMPACT 3, 6, 26, 1, 30, 33, 34, 35, 31, 37
LOCALIZED GELS IN BUBBLE 33, 35, 10, 34
LARGE, SECONDARY GELS 6, 10, 31, 33, 40