Injection Molding
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PET Preform Injection Short Shot
Problem Phenomenon
Material shortage at the end of the preform (neck side).
Cause Analysis
Insufficient injection pressure/speed, poor venting; PET melt viscosity is relatively high, and thin-wall long-flow preforms are prone to short shots.
Solution
①Increase pressure and speed; ②venting; ③check melt temperature; ④check hot runner temperature.
Key Takeaway
Preform short shot = pressure and venting.
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