Tips and Trick Designing to avoid sink mark

Since we have recomended formula to avoid sink mark t <=1/3 T

We should consider rib thickness when designig reinforce rib or hook, boss which can make void or sink mark at plastic product.

Why sink mark should be avoid from plastic product? Sink mark is one of many plastic part defect, it can be goup in appearcne defect. it make ugly appearance when defect occure on your product.

How to designing it?

Here is the best practice design.

Boss Feature

for short boss we can apply thispractice.

below is recomnded design for high boss with make undercut feature (need angular mechanism).