Sifting and Grading Process of Tea Manufacturing

We have come to another processing step in our article series. What is sifting and grading in tea manufacturing? When it derived the dried tea from the dryer there are tea particles mix with un wanted stalk and other particles. These unwanted articles have to be removed and divide tea in to different grades. This is called sifting and grading.

First these dried tea particles are pass through the stalk extractors to remove the stalks, stalks are the fiber particles which add dull brown colour to the tea. These stalk particles will cause the reduction of market value also. Thera are some machineries specially designed for this stalk extraction process. Middleton bubble tray stalk extractor and fiber mat are most common machineries used in this process. These machines use the static electric attraction to attract the fiber and let the good tea particles to pass through.

Then comes to the grading, Michie and Chota sifters are commonly used to separate the particles based on their size there are different size sew series which let the different size particles to separately pass them and collect them separately as different grades. Then these grades will pass through other machines separately as grade wise.

Next is the colour sorter which is divide the particles based on the colour. It will sepatate brownish fiber and other particles from black colour tea particles. This process will purify tea further. Then comes the winnower which is mainly used to remove the heavy particles like sand or metal particles if they are present as contaminators. In the winnower there is a blowing fan of high velocity which will blow the tea particles far and let the metal and sand particles drop in-situ. After this process clean tea will be packed and marketed safe and sound for consume.

2 thoughts on “Sifting and Grading Process of Tea Manufacturing”

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