The necessary washing machines of cleaning PET flakes are washing tank, hot water washing tank and frictional washing machine. In fact, the PET washing machines are adjustable to choose, people with low budget can choose these three machines to wash their plastic flakes. But if the waste plastic bottle are too dirty or the plant would like to use more washing equipment to ensure the plastic's cleanliness, the number of washing tank, hot water washing machine and frictional washig machine can increase to two or three.
In the video. you can see the plant used one hot water washing machine, three washing tanks and three frictional washing machines during the PET bottle recycling line.