Molds & Tooling
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PMMA Short Shot Troubleshooting
Problem Phenomenon
Thin-walled transparent parts lack material at the end; still not filled after raising temperature and pressure
Cause Analysis
PMMA has poor flowability, making thin-wall long-flow-path filling naturally difficult; flow resistance increases sharply when wall thickness is less than 1mm; low mold temperature aggravates surface layer solidification; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Design wall thickness not less than 1mm; ②raise mold temperature to delay solidification; ③enlarge the gate and optimize runner layout; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The root of PMMA short shots lies in flowability and wall thickness; structural guarantee plus mold temperature increase is more reliable than simply raising pressure; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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