Molds & Tooling
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PARA Meld Lines
Problem Phenomenon
PARA products show obvious meld lines; multi-gate parts have low strength at melt-converging points, and improper gate position places the meld line in the load-bearing zone.
Cause Analysis
Fast cooling after the melt fills the mold causes meld lines; improper gate placement makes meld lines appear at conspicuous or load-bearing positions; without cold slug wells, cold material at the meld line cannot be discharged.
Solution
①Increase injection pressure, speed, barrel temperature and mold temperature; ②Change the gate position so the meld line appears at an unloaded or inconspicuous position; ③Open cold slug wells to discharge cold material.
Key Takeaway
PARA meld line treatment gives equal weight to temperature, speed, pressure and gate position; cold slug wells are an effective structural means; position transfer is better than fighting strength head-on.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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