Molds & Tooling
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PMMA Product Weld Line Venting
Fenómeno del problema
Burning and bubbles coexist at weld lines; both are eliminated simultaneously after venting improvement.
Análisis de la causa
Two melt streams converge and envelop air; without a venting channel, the gas is compressed, burnt and remains as bubbles; the confluence area is a key blind spot for venting.; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based on experience alone.
Solución
①Open vent grooves in the confluence area; ②set overflow wells to guide trapped air out; ③adjust gate to change confluence position; ④reduce speed to assist venting.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Conclusión clave
Weld line trapped air shows both burning and bubbles; venting plus overflow wells is the standard solution.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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