A STUDY ON THE PAN-MILLING PROCESS AND THE PULVERIZING EFFICIENCY OF PAN-MILL TYPE EQUIPMENT

In this paper, the pan-milling process and the pulverizing mechanism a nd efficiency of pan-mill type equipment, which was designed and manuf actured in our lab for pulverization, mixing, and stress reactions of polymers, have been studied. The effects of load and rotation speed of the equipment on the pulverizing of polystyrene was investigated by m eans of quantitative operation, particle size, and distribution measur ement, as well as theoretical analysis using the Rosin-Rammler Functio n and the logarithmic normal distribution function. The results demons trate that lower rotation and higher load are favorable to higher pulv erizing efficiency and to the mode of surface pulverizing. As a result of the quite strong forces during pan-milling mechanochemical degrada tion takes place, which is a first-order reaction.