Processing Machinery
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LDPE Color Change and Cleaning
Fenómeno del problema
After color change the products carry off-color for a long time, and the consumption of purging material is large
Análisis de la causa
LDPE has good fluidity and is relatively easy to clean; but changing from dark to light colors still requires thorough displacement; holding temperature during shutdown causes residual material to degrade and discolor; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
① Use purging material as a transition when changing from dark to light colors; ② empty the barrel before shutdown; ③ focus on cleaning the dead corners of the hot runner system; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Conclusión clave
LDPE color change relies on the flow advantage; emptying and transition material are the keys to saving time and material; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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