Injection Molding
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Oil spots on EVA injection molded products
Problem Phenomenon
Oil spots appear on surface of EVA injection molded products after demolding; mold release agent residue or lubricant exudation
Cause Analysis
Too much mold release agent sprayed or unevenly distributed; EVA internal lubricant stearic acid type exuding to surface; mold lubricating oil seeping into cavity
Solution
1) Reduce mold release agent dosage or switch to dry film release agent; 2) Use internal lubricant instead of external release agent; 3) Seal mold lubrication parts to prevent oil from seeping into cavity; 4) Clean product surface to remove oil spots then test to identify source
Key Takeaway
Oil spots are caused by external sources of release agent and lubricant; reducing release agent and sealing mold lubrication are key
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