Extrusion & Post
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POM Delamination and Peeling
Problem Phenomenon
The part surface layer delaminates and peels; peel test shows poor interlayer bonding and unqualified strength
Cause Analysis
Delamination is mostly due to contamination mixing in or excessive shear from too-small gates; cold material entering the cavity also forms delamination interfaces; POM mixed with even trace amounts of other polymers becomes incompatible and delaminates
Solution
①Check virgin material and regrind for contamination; ②enlarge the gate and provide sufficient cold slug wells; ③after barrel cleaning, verify whether delamination is eliminated; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Contamination is the number one suspect in POM delamination; gate and cold slug well are the second check, and cleaning verification closes the loop; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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