Molds & Tooling
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ASA gate design defects
Problem Phenomenon
Snake patterns, scorch spots and voids appear near the gate of ASA products, gate marks are obvious, and the gate area of appearance parts becomes the main defective area.
Cause Analysis
Gate size too small produces high shear jetting and shear heat; gate position makes melt directly hit the cavity wall forming jetting snake patterns; coupling of cooling and shear in the gate area produces various marks.
Solution
①Gate size reasonably enlarged according to product wall thickness; ②use overlap or fan gates to avoid direct impact; ③multi-stage injection with low speed through the gate area; ④gate position avoids the main appearance viewing surface.
Key Takeaway
ASA gate area defects are a combined problem of size, position and speed; conventional gate forms are all applicable but the size must be appropriate; avoiding the main viewing surface is a basic principle.
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