Injection Molding
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EVOH injection product has oil spots
Problem Phenomenon
Oil spots appear on the surface of EVOH injection molded products after demolding, release agent residue or lubricant precipitation
Cause Analysis
Release agent sprayed too much or unevenly distributed; internal lubricant stearic acid type in EVOH precipitates to the surface; mold lubricating oil seeping into the cavity
Solution
1) Reduce release agent dosage or switch to dry-film release agent; 2) Use internal lubricant to replace external release agent; 3) Seal mold lubrication parts to prevent oil from seeping into the cavity; 4) Clean the product surface to remove oil spots and then test to identify the 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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