Processing Machinery
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PMMA Two-Color Molding
Problem Phenomenon
PMMA two-color parts crack at the junction of the two materials
Cause Analysis
Shrinkage difference between the two materials and weak interface bonding cause internal stress concentration and cracking; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry literature and should be confirmed first during troubleshooting
Solution
Match material compatibility in two-color design; interlocking interface structure design; match process temperatures; after adjustment, take samples continuously 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
Two-color parts require material matching plus interface 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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