Molds & Tooling
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PC Thin-Wall Part Flow End Burning
Fenómeno del problema
Thin-wall PC parts show black marks and burnt smell at the flow end, related to the high-speed filling process.
Análisis de la causa
Thin-wall filling requires high speed and high pressure, and gas trapped at the end is adiabatically compressed, heats up, and burns; poor venting is the root cause; PC's high processing temperature makes end burning risk greater; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solución
①Open vents at the end or use venting steel; ②Use staged injection with speed reduction at the end; ③Appropriately increase the mold temperature to reduce filling pressure demand; ④Optimize the gate position to shorten the flow length; ⑤Evaluate wall thickness.
Conclusión clave
PC thin-wall 'high-speed process must match venting capacity': the faster the speed, the more the venting must be in place; the venting design of thin-wall parts must be front-loaded, do not wait until burning occurs to fix it.
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