Molds & Tooling
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POM obvious gate marks
Problem Phenomenon
The gate area of the product is rough and whitened or depressed, with obvious impact on appearance parts, improving after changing the gate form.
Cause Analysis
Improper gate size or excessive shear causes stress concentration and local degradation in the gate area; pulling of cold runner gates during demolding also causes surface marks.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Optimize gate type and size; ②reduce the shear rate through the gate; ③trim gate residue flat; ④use a submarine gate on appearance surfaces.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Gate marks affect appearance and stress distribution; select the gate form according to the product appearance grade, and submarine gates suit automation and appearance requirements.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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