ACP Crystallizers with an innovative concept that allows continuous crystallization of PET, even re-ground material or of minimum quantities. The air flows through the rotating hollow shaft and is distributed evenly to various levels of suction hopper through the hollow diffusion reel. There is therefore no stopping of the client’s production for cleaning of the hot air diffuser, plus the fact that without the use of large filters it can be combined with a dehumidifier. The fully automatic functioning is controlled by a microprocessor managing the crystallization process without the presence of an operator, comparing the air temperature with ampere absorbed by the reel motor