Molds & Tooling
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TPU product surface scratch
Problem Phenomenon
Dragging scratch marks appear on the surface after demolding.
Cause Analysis
Improper demolding timing makes the product overheated and too soft; insufficient demolding draft or cavity surface finish mismatch (over-polishing causes vacuum adsorption instead); during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①extend cooling to improve demolding strength; ②ensure demolding draft; ③adjust cavity surface finish; ④optimize ejection timing; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
TPU surface scratches are related to the demolding state; the surface is not the smoother the better, and appropriate roughness is actually beneficial to demolding; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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