INJECTION MOLDING - PowerPoint PPT PresentationĬan result from poor gate placement Unavoidable areas Weld lines occurs if material temperature is low, mold temperature will be improper, improper gate position, improper runner balancing.įour possible cause 1 Pin above flush 2 Pin below flush 3 Clearance around pin 4 Improper cooling time 5 Ejection force more. No draft difficult to eject Drafted faces 41 No Transcript 42 No Transcript 43 Short Shot Flash Weld Lines Ejector Pin Marks Sink Marks 44 Short Shot Cold material, cold mold, insufficient pressure, non uniform mold temperature, insufficient feed, entrapped air, insufficient external lubrication, insufficient plunger forward time, small gates. Used for transparent components where flow mark is not allowed. Used for the components required with stress and warpage free. GATE -It is the connecting path between runner and component.
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