SIZE REDUCTION | GRANULATORS


consists of a WP80 pneumatic sprue picker, its new G-Max 9 granulator and a Feedmax S3 standalone loader with a metering valve. For grinding harder and glass-reinforced plastics, a screenless S-Max granulator can be used. Depending on the required degree of accuracy for the dosage of regrind, the inline recycling cell can be extended by adding a Gravimax blender, which ensures the moulding machine is not fed an excessive amount of regrind at any time. Another option, it said, is to use a servo picker instead of the WP80 sprue picker equipped with pneumatic cylinders as standard, such as a Wittmann WS80, or the small servo-driven Primus 10 machine. The new G-Max 9 granulator shown at K2019 is suitable for inline recycling of soft to medium-hard rejects and sprues consisting of TPU, PP or PE, to be used on injection moulding machines with clamping forces of up to 90 tonnes. It is supplied with one of three material hoppers of different heights: low, medium and standard, for use with different set-ups on the moulding machine such as chute, conveyor or sprue picker. Wittmann said the G-Max 9 can handle a material throughput of up to 20 kg/h (depending on the form of parts, pieces of sprue, sifter size and quality of material). It operates with a low noise level and is said to be extremely energy-efficient. The cutting rotor of the G-Max 9 comes with 3 × 3 knives ar- ranged in a staggered position, which produce a clean, uniform granulate. The material sifters of the granulator are available with holes in diameters of 4, 5, 6 or 8 mm, which allows adap- tion to varying materials and throughput rates. The tiltable material hopper facilitates cleaning and servicing of the appliance, said the company, so changing a sifter can be carried out without tools, and the maintenance periods are shortened to a minimum. CMG made K2019 the platform for the launch of


its new Evoluzione series of granulators for post-consumer recycling. It said the new EV916 and EV616 models are high-performing, versatile, efficient and sustainable. The model on display at K2019 was the EV616, a 9-tonne machine with sufficiently moderate dimensions to be positioned in the stand. Giorgio Santella, General Manager for Sales and Marketing, said CMG refers to the


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Evoluzione series as “supergranulators”. There was good feedback to the new technology from visitors to CMG’s stand, he said, identifying three key features that generated interest. The first of these is the Evoluzione’s cutting


chamber, which is made of CNC machined steel parts, all “bolt-and-dowl” assembled to provide precision of assembly to the 100th of a millimetre and precision of cutting to the 10th of a millimetre. A completely assembled cutting chamber allows easy maintenance when a part must be replaced. The assembly includes replaceable Hardox plates. The Evoluzione’s Adaptive Motor Power (AMP)


control and EISA type motor were also attractive to visitors, said Santella, as these provide the highest degree of reliability and operational energy efficiency. The AMP can adjust the power of the motor automatically to determine the best opera- tional condition so the regrind has the most homogeneous dimensions, eliminates powder and reduces deterioration of rotor and bed knives. Santella said another important


feature of the Evoluzione is its Industry 4.0 controls that allow the user to have a full diagnostics screen indicating all operational conditions of the


granulator, and that enables connectivity via the OPC-UA protocol to export any of the operational parameters to external systems. “Predictive maintenance and auto adjustment to the conditions of operation of the recycling line are additional


Left: Wittmann’s new G-Max 9 granulator fitted with a standard hopper


Above: Image of an inline recycling cell developed by Wittmann with sprue picker, granulator and material loader


November/December 2019 | PLASTICS RECYCLING WORLD 33


IMAGE: WITTMANN GROUP


PHOTO: WITTMANN GROUP


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