Molds & Tooling
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PBT Notch Sensitivity
Problem Phenomenon
The load-bearing capacity of the product drops greatly at sharp corners and notches, and it breaks first when subjected to force or impact
Cause Analysis
The benzene ring and ester group in the PBT molecule form a large conjugated system, giving large molecular rigidity and poor toughness; the polar ester carbonyl group increases intermolecular forces, making it extremely sensitive to notches and sharp corners
Solution
①Use arc transitions at all corners, especially internal corners; ②Design to avoid sharp-corner stress concentration; ③For high-impact requirements select toughened modified grades; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Notch sensitivity is a shortcoming determined by PBT's molecular structure; fillet design is a mandatory requirement, and toughening modification is the performance way out; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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