Injection Molding
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TPU product mold sticking
Problem Phenomenon
The product sticks to the cavity and is difficult to demold, and the surface is scratched and deformed after ejection.
Cause Analysis
Too high injection pressure and too long holding time over-compact the product and make it grip tightly; too high or too low mold temperature and poor mold surface condition (over-polished or rough) all aggravate mold sticking.
Solution
①reduce injection pressure and holding time; ②adjust the mold temperature to a suitable range; ③polish or change the mold surface condition; ④ensure the demolding draft and standardize the use of release agent.
Key Takeaway
Mold sticking is one of the most common TPU problems; TPU itself is highly sticky, and only systematic troubleshooting of the three aspects of pressure, mold temperature, and mold surface can cure it; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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