Molds & Tooling
2 views
TPU Demolding Difficulty
Problem Phenomenon
Soft TPU products are difficult to demold, deform during ejection, and undercut designs cannot be demolded
Cause Analysis
The softness and elasticity of TPU make demolding difficult; small ejector pin area concentrates pressure; undercut designs require elastic deformation for demolding; mold surface texture affects demolding; when troubleshooting on site, verify item by item according to this mechanism, avoiding blind machine adjustment based solely on experience
Solution
①Arrange ejector pins with large area and balanced distribution; ②use TPU elasticity to design demoldable undercuts; ③EDM texture on mold surface aids demolding; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
TPU demolding should make good use of its elasticity; large-area ejection plus elastic undercuts is the hard skill for soft materials; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
Was this helpful?
0 people found this helpful
Thank you for your feedback!