The machine of work institutions is by two group rotor institutions composition, work shí from feeding mouth into people of not regeneration resin sand in gravity role xià whereabouts, dang falls to throwing sand disc turned by formed of cylindrical type regional shí, and throwing sand disc shàng of leaves occurred impact, impact hòu of most sand attached in leaves surface shàng, with leaves do rotary movement of while, by leaves of end are high-speed throws, was throws of sand and surrounding circle occurred impact, makes resin film broken shedding.