Problems and solutions in woven sack(raffia) tape plant

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PROBLEM

 CAUSES

 SOLUTIONS

FILM PUNCTUREHold up particleChange screen pack. Check Row Material Moisture. Check heat stability of master batch.

GELES, HARD OR UNPLASTICIZED PROFILEImproper 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  VARIATIONExtruder 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 BREAKAGEExcessive stretch ratio. Low orientation temp. Hold up particle in film. Very stiff film. Extruder surgingIncrease 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 ELONGATIONLow stretch ratio. Too soft film. Low orientation tempIncrease stretch ratio. Increase distance between die opening and water level in quenching tank. Increase orientation temp.
TAPE FIBRILLATION Tape too stiff Scratches on tape moving path.

Use anti fabrillation. Polish tape moving path. Use wear resistance material items.
SHRINKAGE IN FABRIC / CURVED TAPE


DOT IN FILM 










Tape plant operating formula and more
Check annealing system. Increase annealing temp. Check cooling efficiency of roller.

CHANGE FILLER BRAND
filler quality not good















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