MATERIALS HANDLING | TECHNOLOGY
Below: The Ultra family from Maguire
provides the matching control, from which eight material loaders and one stand-by blower can be managed via its colour touchscreen display. Wittmann will demonstrate the latest develop-
ment of its gravimetric blenders from the Gravimax series. Latest models of the G series are designed for applications requiring material throughputs of more than 700 kg/h. The new Gravimax G76, for example, can handle 7 kg per dosing cycle and blend in up to six components. Wittmann says that, despite the large quantity of
proved auto start and auto stop features. “When you want the dryer to stop drying a grade of material at 6pm, it will automatically stop at that time, but most importantly it will stop empty, so as to allow a very rapid and efficient clean-down process, and then a fast start-up of the next grade,” says Crittenden.
Conveyors and loaders There’s quite a lot going on in loading systems, too. Metroflow is Motan-Colortronic’s brand of gravi- metric loaders using vacuum conveying for precise material throughput control. They are used in pneumatic conveying systems, for example to convey material from a silo to a drying bin or to the processing machine. Motan-Colortronic says the Metroflow loaders use extremely precise weighing technology, making them particularly suited for monitoring material consumption in real time, “which means that the units are predestined for use in an Industry 4.0 environment.” The company has extensively reworked and
expanded the Metro range of individual material loaders. Metro G (G stands for granulate) types are for large material throughputs. The Metro R was designed for processing regrind, and Metro F (Flakes) loaders units are designed for processing flakes. All are now available in three sizes – with 60, 100 and 150 litre capacities. Because flakes do not flow freely and are prone to bridge-building, Metro F loaders are equipped with an extra-large outlet flap. Metro SG material loaders are budget versions for standard applications, and are said to be quick and easy to install. The new MetroVac SG conveying station with conveying control, blower and central dust filter, which can supply up to eight material loaders and four purging valves, is compatible. The new Metronet SG conveying control
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material, real-time weighing technology makes it possible to reach a reproducible dosing accuracy of 0.05 % in the ratio of virgin material to additive. The material containers are virtually free of interfering edges that could obstruct material flow. From these material containers, each component is metered into a weighing container by pneumatic dosing sliders. Depending on the material, the dosing sliders can either be opened for a set period to let the material flow freely, or they are opened in pulsed intervals until the desired quantity of material has been reached. After weighing, the materials flow into a spherical mixing container, where they are mixed into a homogeneous blend by a spiral-shaped device. A new software package, GraviLog, allows various material quantities and dosing deviations to be documented. Gravimax G76 is also capable of bidirectional data exchange via OPC UA.
Micro-dosing Piovan will present a new micro-dosing unit for the first time. This unit can feed machines even with only one granule at a time, while maintaining very high accuracy to meet requests that come mainly above all from highly technical sectors such as the medical sector and precision micro-moulding. The medical range is also com- plemented by machines suitable for usage in clean rooms, such as the Pureflo filterless receiver, which requires neither compressed air nor maintenance, and the emission-free DPA dryer. Conair says its new TrueFeed Micro Feeder also can count and dispense standard and micro pellets one by one. It is designed for dispensing ultra-low doses – fewer than five pellets per second. The user inputs the number of pellets per gram into the controller, together with the required dosing, calculated production rate, and operating mode (injection moulding, extrusion, or batch), and the Micro Feeder does the rest. Standard or micro
PHOTO: WITTMANN
Above: Wittmann’s Gravimax G76 blender
October 2019 | INJECTION WORLD 59
PHOTO: MAGUIRE
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