Injection Molding
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TPE Toothbrush Handle
Problem Phenomenon
Toothbrush TPE overmolded handle molds
Cause Analysis
A humid environment causes surface micropores to trap dirt and mold; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience; this mechanism has been repeatedly verified by industry information and should be confirmed first during troubleshooting
Solution
Select anti-mold formulations; structural drainage design; dry storage during use; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
Handles in humid environments require anti-mold design; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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