Injection Molding
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Oil spots on PVA injection molded products
Problem Phenomenon
Oil spots appear on the surface of PVA injection molded products after demolding, mold release agent residue or lubricant precipitation
Cause Analysis
Mold release agent sprayed too much or unevenly distributed; PVA internal lubricant stearic acid type precipitates to the surface; mold lubricating oil seeps into the cavity
Solution
1) Reduce mold 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 seeping into the cavity; 4) Clean product surface to remove oil spots and then test 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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