Injection Molding
3 views
TPE Shrinkage Rate 1.0-2.5%
Problem Phenomenon
Product dimension deviation; shrinkage differences are obvious for products with different hardness and wall thickness
Cause Analysis
TPE shrinkage rate 1.0-2.5% depends on hardness and wall thickness; higher hardness means smaller shrinkage; larger wall thickness means larger shrinkage; overmolded parts also need to consider shrinkage matching with the hard plastic
Solution
①Mold allowance by 1.0-2.5% shrinkage; ②Recalculate when hardness and wall thickness change; ③Match overmolded parts by the hard plastic substrate; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
TPE shrinkage rate is graded by hardness and structure; shrinkage matching of overmolded parts is a special consideration in dimension design; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
Was this helpful?
0 people found this helpful
Thank you for your feedback!