|
PROBLEM
|
POSSIBLE CAUSES
|
SOLUTIONS
|
| FILM PUNCTURE |
Hold up particle |
Change screen
pack. Change die and screen changer. Check heat stability of master
batch. |
| GELES, HARD
OR UNPLASTICIZED PROFILE |
Improper back
pressure. Improper temp gradient. Moister in master batch. |
Change temp.
Profile. Use fine wire mesh. Reduce die lip opening. Reduce adaptor
flow area. Change screw geometry. Pre-dry master batch. |
| DENIER VARIATION |
Extruder surging. Film thickness
variation across width. Spacer thickness variation. Improper drive
Performance. |
Refer problem III in general
extrusion processing. Reduce throughput rate. Increase die volume.
Adjust die lip. Check uniformity of die temp. Check spacer thickness.
Use carbon steel blade. Check drive performance. Check temperature
of orientation unit across width. Check flow velocity of hot air across
width. |
| TAPE BREAKAGE |
Excessive stretch ratio. Low
orientation temp. Hold up particle in film. Very stiff film. Extruder
surging |
Increase stretch ratio. Increase
orientation temperature. Refer problem of film puncture and gels,
hard or unplasticized particles. Increase distance between die opening
and water levels in tank. |
| LOW TENACITY / HIGHER ELONGATION |
Low stretch ratio. Too soft
film. Low orientation temp |
Increase stretch ratio. Increase
distance between die opening and water level in quenching tank. Increase
orientation temp. |
| TAPE FABILATION |
Tape too stiff Scratches on
tape moving path. |
Use anti fabrillation MB.
Polish tape moving path. Use wear resistance material items. |
| SHRINKAGE IN FABRIC / CURVED
TAPE |
Residual stress in tape. |
Check annealing system. Increase
annealing temp. Check cooling efficiency of roller. |
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Courtesy: Mr. P.M. Jariwala, Kolsite Industries
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