12.5.11 Rough Surface
The finished product exhibits patterns on the surface similar to grooves on
a record, due to rapid cooling of the melt as it nears mold surface, followed
over and over again by fresh melt.
Probable Cause:
1. Molding Machine
• Low injection speed
• Low injection pressure
2. Mold
• Cold mold
• Irregularities in mold surface, defective polishing
3. Material
• Cold melt
Solution (in sequence):
1. Increase injection speed
2. Increase injection pressure
3. Increase melt temperature
4. Increase mold temperature
5. Inspect mold surface
12-15
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FSG2 User Manual
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