The spotting fire (Burn Marks): velocity and pressure spray too high cause the air bubbles in the system and mould can not escape up out through the exhaust system. Are exhaust system layout accordingly. 2-Not filled out completely (Short shot)Create reverse pressure because the air doesn't escape is out 3-Way welding (Weld line) the flow of plastic will be separated to see obstructions on the details, afterwhich gases pass obstructions to the flow will re-enter and welding line was born.
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