Molding Process
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PPO High-Temperature Steam Sterilization Part Deformation
Problem Phenomenon
PPO medical tableware shows deformation and performance decline after high-temperature steam sterilization, and deterioration accelerates as the number of repeated sterilizations increases.
Cause Analysis
Although PPO is steam resistant, long-term repeated high-temperature sterilization still has cumulative effects; product internal stress is released and deforms during thermal cycling; uneven wall thickness aggravates the degree of deformation; the heat resistance grade of the material grade is insufficient.
Solution
①Select a grade with matching heat resistance grade; ②low-stress molding and uniform wall thickness design; ③conduct accelerated verification according to the number of sterilizations; ④include deformation amount in acceptance criteria.; After adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
PPO steam sterilization applications must be verified according to the number of cycles; internal stress management is the core of deformation control; grade selection matches the temperature grade.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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