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Paddle Dryer
Paddle Dryer is a machine used for heat treatment of powders, granules, filter cakes and pasty products in a fully continuous process.These processes include drying, cooling, crystallization, calcinations & melting, evaporating solvents, sterilising, etc.Hot Paddle Dryer consists of a heated trough containing rotating heated paddle shafts. The product is 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 by virtue of gravity. Here the paddles do not serve 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.
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Working Principle
The product is fed into the machine through the top cover at front side. Because the machine is slightly inclined at an angle, the product moves evenly through the machine by virtue of the force of gravity. Consequently, the paddles do not have a transport function. The paddles provide good heat transfer to the product and mixing of the product. At the end of the machine, the end-product moves over the overflow unit and leaves the machine via the underside. The product comes into intensive contact with the walls of the trough, the shafts and the paddles. These are all heated by circulating the heating media through it. The product level reaches slightly above the paddles. Above the product level there is a space for vapor collection. The vapors accumulated in that space are removed from the machine.
Application
Hot Paddle Dryer is a machine which has wide range applications. These applications include those where stringent checks are set on uniform product quality (accurate retention time control and/or strict temperature control), a careful treatment of the product is required in order not to damage it or cause it to generate dust, or precisely the robustness of the machine. The construction of this dryer is compact in comparison with other machines. The hollow shape of the paddle shafts ensures that the total internal surface area serves as a heat exchanger. It provides many square meters of heat transfer area on a limited amount of floor space. Paddle Dryer finds applications in processes include drying, cooling, crystallization, calcinations & melting, evaporating solvents, sterilising, etc.
Salient Features
Excellent control of the retention time and temperature. This results in a uniform product quality.
No drying air required to dry the product.
Minimal dust production due to the slowly turning paddle shafts.
Better heat transfer due to the specially shaped paddles.
