Molds & Tooling
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PARA Dents and Sink Marks
Problem Phenomenon
Dents in thick-wall areas of PARA products; multiple factors of insufficient filling, improper gate, uneven wall thickness and insufficient holding.
Cause Analysis
Insufficient filling feed or inadequate feeding amount; improper or asymmetric gate position; insufficient or too-small sub-runners and gates; uneven product wall thickness; insufficient holding pressure and time.
Solution
①Increase feeding or open the feed port gate plate; ②Adjust gate position and symmetry; ③Add sub-runners and enlarge gate size; ④Increase injection pressure and holding.
Key Takeaway
Systematic troubleshooting of PARA dents covers feeding, gate, runner, wall thickness and holding; uniform wall thickness is the design foundation; holding optimization is the process means.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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