Injection Molding
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Insufficient filling/short shot in PET preform injection
Problem Phenomenon
The cavity is not completely filled during PET preform injection; the preform top is missing or the length is insufficient.
Cause Analysis
Injection pressure or speed is insufficient; melt temperature is on the low side and fluidity is poor; gate size is on the small side with large resistance; venting is poor.
Solution
Increase injection pressure to 80-120MPa and increase injection speed; increase barrel temperature; enlarge gate size; improve venting.
Key Takeaway
PET preform short shot is usually related to excessive flow resistance.
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