Molds & Tooling
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COC Mold Vent Blockage
Problem Phenomenon
After COC is produced for a period of time, trapped gas and burnt defects gradually increase, recovery occurs after cleaning the vents, and recurrence occurs a few days later.
Cause Analysis
Trace low-molecular volatiles in COC processing condense and accumulate in the vents, gradually blocking the venting channels; the temperature difference between the mold temperature and the vent temperature accelerates condensation; there is a lack of a regular cleaning plan.
Solution
①Formulate a regular cleaning and maintenance cycle for the vents; ②design the vents for easy online cleaning; ③check whether the source of volatiles is excessive temperature; ④monitor and warn of trapped gas defect trends.
Key Takeaway
COC vent blockage is a progressive failure; periodic maintenance is the only reliable countermeasure; defect trend monitoring allows early intervention.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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