Molding Process
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Excessive back pressure causing melt overheating in PCTG
Problem Phenomenon
Under high back pressure, melt temperature rises beyond the thermal stability limit.
Cause Analysis
Back pressure set too high generates large amounts of shear heat, accumulated temperature rise exceeds the limit.
Solution
Reduce back pressure to a reasonable range of 0.5-1.5MPa; monitor actual melt temperature.
Key Takeaway
PCTG back pressure is closely related to melt temperature.
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