Washing is important step of making starch

As the cassava fresh roots being havested from the land contains a certain percentage of residues such as sand, small or bigger stones, or even metals being mixed during processing, It is the first very important step to remove the residues. Why? because the material we need is the fresh cassava roots, the purer raw material the easier and safer running for the following processings for cassava roots grating, fiber extraction, starch milk washing, etc. Imagine, once a stone with size of an egg or a coin size of metal were fed into the following rasping machine, the high speed rotating drum will be damaged instantly, furthermore the sieve screen, etc. So in some factories, there are some manual jobs appears along the conveyor belts to check out the material more carefully. Normally in the washing processing, it is a wise idea to add a stone or metal selecting set by self gravity force in the floating washing water, and it is a must to add a magnetic set to remove the metals. and furtherly for the last conveying step where material being fed into the following processing, it is a better idea to choose a net belt with reasonable size of the holes through which any smaller and harder articles could be dropped off before cassava roots were finally fed into the following process. In all, do as much as we could to ensure the raw material of the cassava roots to be pure!