Processing Machinery
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Control of POM's narrow processing temperature window
Problem Phenomenon
The same batch of material produces large quality differences on different machines, and the measured melt temperature span across machines exceeds 20°C.
Cause Analysis
POM has a narrow effective processing window (about 190~230°C), and differences in equipment temperature control accuracy are directly amplified into quality differences; thermocouple drift is more common on old machines.
Solution
①Unify the measured melt temperature benchmark; ②calibrate the thermocouples of each machine; ③set the temperature at the middle value of the window; ④regularly verify the accuracy of the temperature control system.；After adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Narrow-window materials have high requirements for equipment consistency; using the measured melt temperature rather than the set value as the unified benchmark across machines is the key practice for stable quality.；After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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