Injection Molding
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PP Short Shot
Problem Phenomenon
Material shortage at the end of thin-wall long-flow PP parts.
Cause Analysis
Although PP has good flowability, thin-walled parts have high flow resistance; low melt temperature, insufficient injection speed, poor venting, and too thin walls still cause short shots.
Solution
①Increase injection speed and pressure; ②raise melt and mold temperature; ③enlarge the gate; ④improve venting; ⑤evaluate whether wall thickness is below the moldable limit.
Key Takeaway
PP short shots are mostly a balance problem of speed and venting.
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