Troubleshooting guide for AD Star Bag Extrusion Applications
AD Star Bag 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 film thickness
1. Improper die gap setting
2. Unstable extrusion temperature
3. Resin variation
1. Check and adjust die gap for uniform clearance
2. Stabilize extrusion temperature
3. Use resin with consistent melt flow index
1. High extrusion speed
2. Excessive moisture in resin
3. Poor dispersion of additives
1. Reduce extrusion speed
2. Pre-dry resin properly
3. Use well-dispersed masterbatch
Poor weld strength of tape
1. Low stretching ratio
2. Incorrect temperature profile
3. Inadequate resin strength
1. Optimize stretching ratio
2. Adjust heating and cooling zones
3. Use higher strength resin grade
High tape shrinkage
1. Improper orientation during stretching
2. High chill roll temperature
3. Resin with high shrinkage
1. Optimize tape orientation process
2. Reduce chill roll temperature
3. Select resin with lower shrinkage
Poor tape flatness
1. Uneven cooling
2. High die temperature variation
3. Low line tension
1. Improve cooling system uniformity
2. Maintain stable die temperature
3. Increase line tension slightly
1. Resin contamination
2. Degraded polymer build-up
3. Poor filtration
1. Clean die regularly
2. Use clean resin and proper handling
3. Install finer screen changer/mesh
1. Poor tape strength
2. Improper orientation ratio
3. Inadequate resin grade
1. Improve tape stretching process
2. Optimize draw ratio
3. Use high-tenacity resin
1. Film surface not treated well
2. Low corona treatment level
3. Dust/contamination on surface
| 1. Increase corona treatment level (38–42 dynes) 2. Maintain treatment station properly 3. Ensure clean film surface before printing |
