Clextral Rotante drying technology gives petfood processors a new tool for fast, homogenous drying that meets the stringent quality requirements.
Drying is a key step in petfood extrusion; it plays a major role in the final quality of the product. Now twin screw extruder manufacturer Clextral offers drying solutions for petfood processors.
The company's Rotante dryer has distinctive features that ensure complete homogeneity of petfood drying with less energy consumption. The distinctiveness of the Rotante's technology is due to its simple and ingenious design. It transfers product through drying with uninterrupted Archimedes screws mounted in a fixed position on a rotating drum. Each time the drum achieves a full rotation, the product advances simultaneously one step along the screws. This design ensures a continuous, smooth product mix throughout the drying process, and the linear product flow guarantees total control.
Processors can define drying zones inside the Rotante at different temperatures and air speeds to achieve specific product characteristics. Drying flow is annular along the drum with high recirculation flow (80 to 100 000 m3/h).
The dryer provides a continuous product flow with no dispersion of residence time. This means processors can easily switch from one product to another without any risk of cross contamination.
Another key feature of the dryer is the fines recovery system. The regulated air speed from the circulation fans is around 6 m/s to avoid dust stagnation in the upper part of the assembly. Fines fall down the smooth, angled stainless steel walls below and are channeled to two Archimedes screws, which continuously extract them at the dryer base. All fines are recovered for reuse, with no heat degradation, which can occur on traditional dryers.
The Rotante has specific features to ensure energy efficiency and long operating life:
In order to meet each customer's requirements, Rotante technology is modular. It can be built in accordance with product/flow rate customer requirements.
Petfood processors interested in Rotante dryer technology can contact Clextral to test the performance of this technology. In CLEXTRAL's Firminy test center, two Rotante machines are operational, one laboratory pilot project and one industrial dryer.
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