Molds & Tooling
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EVA Foaming Surface Defects
Problem Phenomenon
Pits, broken holes or sticking appear on the surface of foamed products.
Cause Analysis
Poor mold surface condition or improper use of release agent; foaming gas breaks through the surface layer to form broken holes.; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Maintain the mold surface; ②standardize the use of release agent; ③optimize the matching of foaming pressure and temperature; ④check the mold venting.; After adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
Surface quality relies on the matching of mold condition and foaming parameters; the broken hole problem requires controlling the foaming rate.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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