Injection Molding
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TPE burnt and air traps
Fenómeno do problema
Charring and discoloration at the product end, carbon deposit at the corresponding mold position, poor venting
Análise das causas
TPE burnt originates from insufficient venting: adiabatic compression of air causes a sharp temperature rise; excessive injection speed aggravates it; ends and rib positions are high-incidence areas; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solução
①improve venting methods; ②reduce injection speed; ③add vent grooves at ends and rib positions; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes, so as to locate effective measures
Conclusão principal
TPE burnt treatment prioritizes venting; speed control is a supporting means, and carbon deposit cleaning is routine maintenance; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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