Extrusion & Post
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Delamination and Peeling of PE Injection Molded Products
Problem Phenomenon
The surface of PE products peels off in layers, obvious at edges or near the gate.
Cause Analysis
Mixing in incompatible materials (foreign resins, contaminated regrind, color masterbatch with mismatched carrier) prevents the layers from fusing; excessive release agent forms an isolation layer on the surface; excessive gate shear causes a huge orientation difference between the skin and core layers — all three cause delamination and peeling.
Solution
①Investigate mixed-material contamination and standardize regrind management; ②Purge the machine thoroughly when changing material; ③Control release agent dosage; ④Reduce gate shear; ⑤Increase mold temperature to ease orientation.
Key Takeaway
PE delamination = a 'contamination and compatibility' problem: first check mixed material and regrind, then control release agent and shear; for delaminated parts, don't forcibly adjust the process — find the contamination source first.
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