Injection Molding
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GPPS Product Short Shot
Problem Phenomenon
Thin-wall transparent parts are incompletely filled.
Cause Analysis
Injection pressure and speed are insufficient or temperature is low; PS solidifies quickly, and the front easily freezes under thin-wall long flow paths.; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Increase injection pressure and speed; ②appropriately increase material temperature and mold temperature; ③enlarge runners and gates; ④improve venting.; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Short shot is investigated from three paths: pressure, temperature and runner; pay attention to the thermal stability boundary of PS when raising temperature.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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