Injection Molding
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PETG injection molded product sticking at the hot runner gate
Problem Phenomenon
During demolding of PETG products, the residual sprue at the gate sticks to the hot runner nozzle opening.
Cause Analysis
The gate area temperature is high and melt viscosity low causing stringing, the hot runner valve pin does not close tightly, cooling insufficient and gate strength inadequate.
Solution
Precisely control the gate area temperature; check valve pin action and sealing; strengthen cooling at the gate location.
Key Takeaway
PETG hot runner gate sticking requires investigation from temperature and mechanics.
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