Spotlight on …
Feed Production Machinery, Pelleting & Extruding
ANDRITZ ADVANCED EXTRUSION TECHNOLOGIES FOR SUPERIOR FEED CHARACTERISTICS Back pressure valve (FLEXTEX™) and Expansion Control System (ECS™) - Combining two unique process technologies for full feed controllability. Extruding feed is primarily a matter of cooking starch; the better
the starch is cooked, the better the quality of the feed. By controlling the specific mechanical energy (SME) of the screw configuration on the extruder, it is possible to reach optimum gelatinisation of starches, thus achieving a product with just the right palatability and digestibility, ultimately influencing animal growth rates.
FLEXTEX system moves axially and, at the same time, conical so that the meal flow remains even as it is distributed across the die plate. FLEXTEX technology cooks the starch 100% and results in a quality
feed with a higher oil/fat content and less starch while also controlling the bulk density, which can be reduced by up to 30% - with an accuracy of ±5 g/l (0.3 lbs/ft 3). Moreover, with fewer parts to maintain, there is also less upkeep -reducing the cost to maintain.
THE EXPANSION CONTROL SYSTEM (ECS) The ANDRITZ Expansion Control System (ECS) is unique in its ability to control the bulk density of a wide range of products while simultaneously optimising product quality. The ECS helps to control the expansion of extruded feed products by including an airlock under the extruder knife house and adding compressed air inside the knife house. This combination of elements makes it possible to control and adjust the pressure, reduce flash-off, and increasing the bulk density. The FLEXTEX and the ECS systems can be installed individually
or as a combined concept. This is simply a question of each producer‘s requirements. Both systems provide significant flexibility in the production of feed products. Through the use of these two unique tools, producers can continuously control the SME and the ECS during operation, making it is possible to control both the physical quality and the product density.
With most extruders, the screw configuration can be optimised
with the SME necessary to match specific product requirement directly through the screw design and geometry and adjustments to shear locks, kneading blocks, and reverse elements. Sometimes, however, these adjustments alone may not be capable of creating sufficient SME to produce the desired outcome and it becomes necessary to make additional adjustments to other parameters such as the screw speed, the open area of the venture die or die plate or by adjusting the extruder’s overall capacity. Changes such as these can take hours to make and ultimately, result in downtime and increase production costs.
THE FLEXTEX SYSTEM The ANDRITZ FLEXTEX system allows for continuous control of SME applied in the extruder, during operation - without changing extruder configuration or any of these other parameters above. The system is located between the screw and the die plate, allowing
the outlet opening to be adjusted from 3000mm to 100 mm 2 (4.65 - 0.15 in 2), depending on throughput. The location of the FLEXTEX system provides precise control over the pressure in the kneading zone as well as the SME, cutting down on the amount of energy consumed. Changes in the meal flow due to uneven pressure at the die plate can influence the visual quality of the end product. The piston of the
FEED COMPOUNDER SEPTEMBER/OCTOBER 2018 PAGE 39
THE OPTIMIX SERIES OF MIXERS The OptiMix series of paddle mixers stand apart from the other mixers because the dual rotation system used to blend feed ingredients uses a Variable Frequency Drive (VFD) to reverse the mixing direction throughout the blending process. The reversing action eliminates material buildup on the mixing paddles and creates a uniform batch thus reducing the occurrence of cross-contamination which can lead to wasted resources, drug residue build up, and toxicity.
Web:
www.andritz.com/ft
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