Case Study: Nozzle Tip Hang upIn this case the ABS part was having scrap issues with brown streaks and splay. The location of the defects was consistent and seemed to point to somewhere near the front of the barrel or the hot runner. Examination showed that the nozzle tip was very undersized to the bore opening on the hot runner, which resulted in a ledge that allowed material to catch at the bore opening and degrade. When the nozzle tip was replaced with a proper orifice tip the scrap was eliminated.