Processing Machinery
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Color mixing caused by incomplete POM barrel cleaning
Fenómeno do problema
After material and color change, products continuously show off-color streaks, which still occur occasionally after multiple rounds of cleaning.
Análise das causas
Old material remains in the dead corners of the barrel and nozzle and is slowly released during production; the screw flight root and the check ring gap are common material-hiding positions.；During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solução
①Disassemble and inspect the screw to thoroughly remove residual material; ②use special purging material for multiple replacements; ③standardize the material change operation procedure; ④evaluate a screw structure without dead corners.；After adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Conclusão principal
Stubborn color mixing points to material hidden in mechanical dead corners; disassemble and clean when necessary, and rely on standardized cleaning procedures daily to control material accumulation in dead corners.；After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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