Injection Molding
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Oil Spots on PU Injection Molded Products
Problem Phenomenon
Oil spots appear on PU injection molded product surface after demolding, release agent residue or lubricant exudation
Cause Analysis
Release agent sprayed too much or unevenly distributed; PU internal lubricant stearic acid type exuding to the surface; mold lubricating oil seeping into the cavity
Solution
1) Reduce release agent amount or switch to dry-film release agent; 2) Use internal lubricant to replace external release agent; 3) Seal mold lubrication areas to prevent oil seeping into the cavity; 4) Clean the product surface to remove oil spots 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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