... static, roller rotating, materials centrifugal, Evenly distributed around.3.Double-layer dies, up and down dual-use, reduce the cost,enhance the ... no material to press in the center, then material piles up unevenly in thickness. 2. This pellet mill's flat die ... die hole is inconsistencies with the material force. 3. Double-layer dies, multi-function, high efficiency: die has upper parts and lower ...