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Cassava Processing operations
IMPORTANCE OF QUICK PROCESSING
The cassava roots are normally received from the field as soon as possible after harvest and cannot be stored for more than two days. Since the presence of woody matter or stones may seriously interfere with the rasping process by stoppage or by breaking the blades, the woody ends of the roots are chopped off with sharp knives before the subsequent processing operations.
PEELING AND WASHING
In small and medium-size mills the general practice is to remove the peel (skin and cortex) and to process only the central part of the root, which is of much softer texture. In the cassava processing line, whole roots are generally processed.
RASPING OR PULPING
By pressing the roots against a swiftly moving surface provided with sharp protrusions, the cell walls are torn up and the whole of the root is turned into a mass in which the greater part, but not all, of the starch granules is released. The percentage of starch set free is called the rasping effect. Its value after one rasping may vary between 70 and 90 percent.
Hand and mechanical rasping
A simple but effective grater is obtained by perforating a sheet of galvanized iron with a nail and then clamping it around a wheel with the sharp protruding rims of the nail openings turned outward.
Hydraulic raspers
Larger water-powered raspers can be used where running water is available. The waterwheel is rotated by a flywheel and driving belts to a pulley on the shaft of the rasping drum. The drum. 20-30 cm in diameter. is either attached to a primitive wooden construction or fitted into a "rasping table."
Engine-driven raspers
Engine-driven raspers are more economical when production rises above a certain level - say, for the handling of 10 tons of fresh roots a day. The most current model is the Jahn rasper. The machine has a rotor of hardwood or drawn steel tube, 50 cm in diameter, with a number of grooves milled longitudinally to take the rasping blades or saws. The number of saw teeth on the blade |
| Company: |
Henan Doing Mechanical Equipment Co., Ltd
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| Contact: |
Ms. Judy Qian |
| Address: |
Room No.3, 4th floor,Building18 , Area A, Yingxie Garden,Jinshui District,Zhengzhou,Henan,China |
| Postcode: |
460008 |
| Tel: |
00 86 037156771822 |
| Fax: |
00 86 037156771822 |
| E-mail: |
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