Injection Molding
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PBT product short shot
Fenómeno do problema
Incomplete filling of thin-wall long-flow-path products.
Análise das causas
Insufficient injection pressure and speed or low temperature; PBT solidifies fast and the front easily freezes.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solução
①Increase injection pressure and speed; ②appropriately increase material temperature and mold temperature; ③enlarge runner and gate; ④improve venting.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusão principal
Troubleshoot short shot from the three routes of pressure, temperature and runner; when raising temperature, be careful not to exceed the degradation boundary.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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