【正确答案】Staple fibers arrive at a yarn mill in large boxes or bales. At this stage it is possible to combine variants of a generic fiber type or combine different generic fiber groups by the process of blending. Fiber from the specified bales is fed into a hopper, where, except the blending, the process of separating the mass of fiber into tufts and removing trash is begun. Dirt and impurity that are heavier than the fibers and are not entangled in them are separated from the fibers by mechanical forces and air. The fibers are now in a loose, fluffy mass that may be conveyed with forced air through a chute directly to a card, or to a picker and then a card. Where pickers are used, the fibers are further opened, blended, and cleaned with a system of rollers, conveyors, and forced air.