Molds & Tooling
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Boundary of PPO Hot Mold for Stress Reduction
Problem Phenomenon
【Problem Phenomenon】Using a 110-150℃ hot mold to reduce PPO stress, at higher temperatures bubbles form instead and the cycle lengthens
Cause Analysis
A 110-150℃ hot mold can minimize PPO stress, reduce roughness and fill thin walls; but hot mold temperature should not exceed 150℃, otherwise bubbles easily form and the cycle is extended
Solution
Set hot mold at 110-150℃; do not exceed the 150℃ upper limit; thick-walled parts are matched with extended cooling to balance the cycle; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
PPO hot mold 110-150℃ reduces stress; above 150℃ the loss outweighs the gain; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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