Hammer mills use a series of rotating hammers to hit the grain, during which the hammers run at high speeds to break up the raw material until these crushed ingredients can pass through the peripheral leakage mesh. The size and uniformity of feed particles produced by this method depends on the hammer size, shape, rotational speed and the shape and aperture size of the peripheral leakage mesh. The hammer crushing method can be used to produce pelletized feed in a wide range of sizes.
Roller mill crushers utilize pairs of cylindrical rollers to crush raw materials into small pellets. These rollers have wrinkles and fine grooves on their surface that act on the feed surface. The rollers on one side are fast and create absolute pressure on the other side. The size of the feed particles is determined by the number of rollers, the distance between the rollers, the diameter of the rollers, the speed and the corrugated area of their surface. Generally speaking, the roll crushing method produces more uniform feed particles.
