Molds & Tooling
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PPO mold sticking and difficult ejection
Problem Phenomenon
PPO products adhere to the cavity during demolding, the ejection resistance is large, the surface is scratched and whitened by ejection, especially prominent in deep-cavity parts and structures with many ribs.
Cause Analysis
Insufficient draft angle and poor cavity polishing increase the wrapping friction; PPO high-pressure molding makes the product fit tightly with the cavity; excessive holding pressure aggravates adhesion; unreasonable ejector pin layout concentrates the force.
Solution
①Check and increase the draft angle; ②polish the cavity or reasonably use a release agent; ③optimize the distribution and number of ejector pins; ④reduce the holding pressure to relieve over-packing.; after adjustment, continuously sample and verify the effect, and resume mass production after confirming stability
Key Takeaway
PPO mold sticking treatment returns to the three basic elements of demolding: draft angle, polishing, and ejection; release agent is an auxiliary means rather than a radical cure; the holding pressure optimization space is often overlooked.
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