The AF cone crusher is a compressive crusher where feed material is crushed between a fixed concave and a movable mantle. Bigger rock particles are crushed against the mantle and concave. This is called single-layer crushing. When smaller rock particles are crushed between other rock particles, it is called multilayer crushing.Crushers are further categorized by how they crush the material. To understand the difference between the crushing phases, typical examples include reducing topsize from 900 to 300 mm for primary, 300 to 100 mm for secondary, and under 5mm for fine crushing, such as manufactured sand. Types of Crushers.