Molds & Tooling
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PPO warpage deformation
Problem Phenomenon
PPO flat plates and shell parts warp after demolding, the assembly flatness is out of tolerance, and the deformation directions of thick-wall and thin-wall transition areas are inconsistent.
Cause Analysis
Uneven cooling, unbalanced mold temperature distribution, and poor structural design jointly cause dimensional instability; the shrinkage of wall thickness difference areas is not synchronized; although PPO amorphous shrinkage is 0.2~0.7%, local differences still cause deformation.
Solution
①Keep the wall thickness consistent in design; ②optimize mold temperature control and cooling circuit uniformity; ③add cooling channels when necessary; ④adjust the cooling rate and temperature distribution.
Key Takeaway
PPO warpage treatment takes cooling uniformity as the core; wall thickness consistency is the first principle in the design stage; the low shrinkage of amorphous materials does not mean freedom from deformation.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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