Molds & Tooling
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PC Thin-Wall Transparent Part Flow Marks
Problem Phenomenon
Thin-wall transparent PC parts show striped flow marks, visible in transmitted light.
Cause Analysis
Front instability or shear streaks under high-speed filling; shear overheating in the gate area also causes visible marks; thin-wall transparent parts have the highest requirements for flow stability; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
①Optimize the injection speed curve; ②Enlarge the gate; ③Appropriately increase the mold temperature to improve the melt's replication and fit to the cavity surface; ④Make the hot runner temperature uniform; ⑤Reduce shear through the gate.
Key Takeaway
PC thin-wall transparent parts 'have the highest requirements for flow stability': fine matching of speed and shear is the key; transparent parts amplify even tiny flow fluctuations; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence.
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