How can streaking, haze and other irregularities be prevented inside the molding?
This faults to various possible causes:
1. Impurities, mixing with other thermoplastics
Remedy:
- Completely wash out other thermoplastics
- Clean (purge) the cylinder and screw with our cleaning agent PLEXIFIX® sp
- Avoid contamination with other thermoplastics in the drier and / or conveyor system
- Do not add regrind
- Do not mix different grades of PLEXIGLAS® molding compound
2. Differences in wall thickness, sharp-edged transitions, poor plasticizing
Remedy:
- Reduce injection speed
- Increase mold temperature
- Vary meld and nozzle temperature
- Round off and thoroughly polish gate
- Lower screw speed
- Increase back pressure
- Use cylinder with better plasticizing properties
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