How can bubbles be avoided in the bead?

This fault points to various possible causes:

1. Bead too thick

Remedy:
Check bead, keep as small as possible

2. Inadequate venting

Remedy:

• Check vacuum (at least 100 mbar)
• Increase temperature before vent zone
• Reduce screw speed

 
3. Melt temperature too high (material decomposition)

Remedy:
Reduce processing temperatures and / or screw speed

4. Moisture

Remedy:
Predry material

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