What Machines Are Used in Palm Oil Processing: Mill and Refinery Equipment Answering the core question: What machines are used in palm oil processing? Palm oil processing runs in two stages, and each has its own machine set. In the mill, fresh fruit bunches pass through a steriliser at 130-150°C for 60-90 minutes, a thresher or stripper that separates fruit from the bunch, a digester at 90-100°C that breaks the fruit tissue, a twin-screw press that squeezes out the crude oil,