Features
- Improve viscosity
- Increase of solubility
- Reduction of sugar content
- Colour treatment of starch - yellow or white
Starch dextrination
Dependent on the intended use of the starch, e.g. paper processing, binder for pigments, glue production, it has to be dextrinated in such a way that the structure fits the production process. Important process parameters for roasted dextrine are the amount of additives, pH level, moisture, roasting time and roasting temperature.
In close co-operation with experienced partners for recipe development, Royal GMF-Gouda offers turn-key processing solutions for starch dextrination from first design, through laboratory tests and engineering to delivering of the necessary industrial equipment.
The process
After tests are completed succesfully, the dextrination (step 3) can be implemented based on the following flow sheet.
The native starch is mixed with the necessary additives and processed for a certain time and under defined conditions for maturing, so that an intensive mixing of starch and additives is guaranteed. The next process step is to dry the starch with the required moisture content in the Royal GMF-Gouda Spiral Flash Dryer.
After drying, the process is continued with roasting the starch under pre-defined conditions in the Royal GMF-Gouda Paddle Roaster followed by cooling in the Royal GMF-Gouda Paddle Cooler.
Royal GMF-Gouda Paddle Roaster/Cooler
The Royal GMF-Gouda Paddle Roaster/Cooler is the heart of the process. The Royal GMF-Gouda Paddle Roaster/Cooler has a heated or cooled trough containing rotating heated or cooled paddle shafts. The product comes into intensive contact with the walls of the trough, the shafts and the paddles, thus heating or cooling the product. The product is continuous fed into the front of the machine. The trough is oriented at a small angle of inclination, placed slightly in unloading position. The product moves to the outlet as a result of gravity. The paddles do not have a transport function. They are designed for maximum heat transfer. At the outlet side, the product moves out of the machine via the overflow unit.
The features of the Royal GMF-Gouda Paddle Roaster/Cooler are:
- Excellent control of the retention time and temperature
- Fully continuous process
- Uniform product quality
- No drying air required to dry the product
- Hardly any dust production
- Better heat transfer.
The working principle of the Royal GMF-Gouda Paddle Roaster/Cooler, with low rotation speed of the paddle shafts and indirect roasting or cooling principle, contributes to a negligible or even zero substance emission. When it is nevertheless decided to use a gas cleaner, such as a gas scrubber or gas filter, its size can remain small due to the low gas flow rates.
After this heating and cooling process the dextrinated starch is stored or packed in big bags.
