Injection Molding
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Oil spots on PVA injection molded products
Fenómeno do problema
Oil spots appear on the surface of PVA injection molded products after demolding, mold release agent residue or lubricant precipitation
Análise das causas
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
Solução
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
Conclusão principal
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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