Troubleshooting guide Leno Bags Extrusion Applications
Leno Bags Extrusion Troubleshooting
Problem
Probable Cause
Suggested Remedy
Temperature Setting
Temperature setting are crucial parameter for proper plastic processing ,hence one should check temperature controller, thermocouple and solid state relay(SSR)
- when you cold start the machine ,wait for 2hours.
Uneven tape thickness
1. Improper die gap setting
2. Unstable extrusion temperature
3. Resin MFI variation
1. Adjust and balance die gap
2. Stabilize heating zones
3. Use resin with consistent melt flow index
1. Overstretching of tapes
2. Excessive moisture in resin
3. Poor dispersion of masterbatch
1. Optimize stretching ratio
2. Pre-dry resin properly
3. Use well-dispersed additive masterbatch
Poor tensile strength of tapes
1. Inadequate orientation
2. Improper cooling during stretching
3. Low-quality resin
1. Increase draw ratio for better orientation
2. Adjust cooling roll temperature
3. Use high-tenacity PP resin
High shrinkage in tapes
1. Insufficient heat setting
2. High quench bath temperature
3. Resin shrinkage tendency
1. Optimize heat-setting zone
2. Reduce cooling water/roll temperature
3. Select resin with low shrinkage
Fibrillation of leno tapes
1. Wide molecular weight distribution of resin
2. Excessive draw ratio
3. Absence of anti-fibrillation additive
1. Use resin with narrower molecular weight distribution
2. Reduce stretching ratio
3. Add slip/anti-fibrillation masterbatch
1. Overheating of polymer
2. Resin contamination
3. Additive incompatibility
1. Avoid excessive heating
2. Use clean, virgin resin
3. Ensure masterbatch compatibility
1. Resin contamination
2. Polymer degradation in die
3. Poor filtration
1. Clean die lips regularly
2. Avoid resin overheating
3. Use fine mesh screen changer
1. Poor tape strength
2. Uneven weaving tension
3. Inferior resin grade
1. Enhance tape orientation and strength
2. Maintain uniform weaving process
3. Select strong, high-tenacity resin
