MACHINERY | GRANULATORS
granules. The G17- MED granulators
produce regrind that is dimensionally compara- ble to the virgin pellet, says CMG. The company has also developed a new cutting chamber for its Evoluzione
series, in which a new rotor configuration allows rotating blades to cut material perpendicularly
Above: The cutting chamber of Wittmann’s G-Max XL is easily accessible
against fixed blades.
The blades are mounted directly on the end of the support bracket, which facilitates high inclina- tion of the blades and allows for easy and quick maintenance and replacement as the cutting cham- ber is accessible from the front of the machine. The material does not rotate with the rotor, avoiding the dust and small particles that become waste material in the washing phase. The production of micro particles is reduced to a few percentage points, compared to 15% or more with a conven- tional granulator, says CMG. The open rotor design occupies 30% of the space inside the cutting chamber and the ratio between the volume of the rotor and the cutting chamber is 30/70, while that of conventional granulators is 70/30. The cutting chamber also benefits from tangential development, guarantee- ing smooth material ingestion without resorting to forced feeding systems.
Sprue recycling Wittmann says its G-Max XL large-sized grinder is aimed at larger injection moulded parts up to 500 x 200mm. The beside-the-press blade granulator has a compact footprint and a maximum material throughput of 100 kg/hour. Ideal for inline recy- cling of sprues and reject parts during the start-up phase, it can also be used as a central granulator. The open design of the three-blade rotor makes it suitable for grinding heat-sensitive materials that still contain heat from processing. Open spaces between the blades and rotor shaft ensure efficient ventilation and good cooling. Knives can be changed easily. Using a pre-adjustment fixture for the cutting gap, the knives are preset outside the cutting chamber to the correct distance from the two fixed counter blades. The rotating and fixed blades, which are angled in opposite directions, ensure a clean scissor cut. The model is driven by three V-belts, which
ensure optimal torque and a low speed of 340 rpm 18 INJECTION WORLD | January/February 2025
at 50Hz. At this speed, hardly any particles are carried around the rotor – allowing them to pass through the screen in an optimal manner. The result is a cleaner, more uniform regrind and optimised throughput – with low noise develop- ment and energy consumption. The sound-insulated material hopper further
reduces noise. The feeding hopper can be aligned horizontally or vertically, so there is the option to feed parts by robot, conveyor belt or manually. Options include: placing a magnet on one side
of the hopper, to prevent feeding of metal parts; and, a water-cooled cutting chamber makes grinding warm or hot material easier. No tools are required to access the cutting chamber or screen fixture, making cleaning and maintenance very easy. This means that even material and colour changes can be carried out quickly – further increasing productivity.
Continuous throughput Getecha has developed several central granulators for the continuous throughput of medium to large volumes of plastic waste.
Designed for comminution capacities of up to 1,000 kg/h, the RS 45090 hopper granulator can grind both missing parts and plates and pipes. For this purpose, it has several bypass hoppers as well as a 45kW motor that drives five rows of mounted rotor blades (rotor diameter 450mm) against two stationary blades. The screen hole diameter is 8mm as standard but can be adapted to different material properties. The front feed hopper of the RS 45090 can be fed manually or is equipped by Getecha with a belt conveyor as part of the process automation. For ergonomic reasons, the hopper and granulator body are double-walled with integrated sound insulation. Thanks to the drive being moved upwards and into the housing, the mill is compact despite its size and takes up relatively little space. The opening mechanism for the hopper and the screen carriage can be operated hydraulically, which simplifies cleaning and maintenance. It also offers smaller central granulators. The RS 30040 is designed for a throughput of up to 360 kg/h with a 22kW drive. It operates with a closed three-blade variation rotor with a diameter of 300mm, in which all components in contact with the product are made of stainless steel. The cutting length here is 410mm. At the same time, Moretto presented a range of
innovations from across its ancillary product range at last year’s Fakuma – including its GR 6050 Hyper Cut – a low-speed grinder that is new to the market.
www.injectionworld.com
IMAGE: WITTMANN
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