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TECHNOLOGY | RECYCLING


When the injection moulding machine is off, the granulator stops automatically, helping save energy. Other features of the new S-Max series include a high level sensor that gives a visual and audible


alarm if necessary, and is located underneath the cutting chamber, thus avoiding overfilling of the bin, and also keeping the cutting chamber free from regrind. The position of the sensor provides additional advan- tages, such as direct wiring to the electrical cabinet, the sensor’s head not being amongst the material, and full


inlet capacity of the bin. The swivel outlet pipe


Above: The new low-speed S-Max 2 screenless granulator from Wittmann – one in a series of three


can take different positions, making it easier to connect the flexible hose to the hopper loader. This typically allows for a more efficient use of the floor space next to the machine. The slanted, front cut outlet pipe with adjustable airflow evacuates the regrind more efficiently and also avoids the block- ing of the flexible hose. Good access to the cutting chamber is provided from above via the 90 degree tilting hopper to allow easy cleaning. Conair has launched a new portfolio of Viper


granulators with standard features that include improved sound insulation, hardened and water- cooled cutting chambers on most models, as well as bigger screens for increased throughput compared to the company’s previous offerings. Models have been introduced in a range of configurations for a number of applications, including injection moulding. From small press- side units to large, central granulators, the new Viper product line includes 14 different models with rotor diameters of 140, 200, 300, 420 and 570 mm (6, 8, 12, 17 and 23 inches), and maximum


Wittmann’s S-Max low speed granulators for inline recycling S-Max 2 S-Max 2 Plus


S-Max 3


Cutting chamber Number of knives Motor output Rotation speed Throughput Regrind size


240×249 mm 240×346 mm 24×467 mm 2


2 1.1 kW 1.5 kW


20 kg/h* 4,5,7 mm


3 2.2 kW


27 rpm@50 Hz 27 rpm@50 Hz 27 rpm@50 Hz 12 kg/h* 4 mm


30 kg/h* 4,5,7,10 mm *Depending on material, shape, density of sprues and parts to be processed, and regrind size. 50 INJECTION WORLD | July/August 2018


throughputs from 36 kg/h (80 lb/h) to 1,724 kg/h (3,800 lb/h). Tangential-feed cutting chambers are standard on smaller grinders, while large units come in a super-tangential configuration to facilitate feeding of large and bulky scrap. Three- blade open rotors are also standard, and other rotor designs are available. Larger granulators and speciality units will be added to the line in the near future, says the company. “The design of our new Viper granulators has been totally customer-driven,” says Sam Rajkovich, Vice-President, Sales and Marketing, at Conair. “Our objective was to develop a straightforward, uncom- plicated suite of Conair-designed machines, suitable for most applications. We also wanted to make standard as many popular features as possible.” The company says that there are a number of


standard features and benefits of the new Viper granulator line. These include quieter operation, where all but the smallest and largest models are fully sound-insulated not only on the hopper, but also on the cutting chamber. Conair adds that most units will operate at about 80 dbA for most materials and throughputs. The cutting chambers are made with abrasion-resistant steel, hardened to 550 HV, which reduce wear and increase the cutting chamber’s life span. Water cooling is provided on machines with 300 mm (12 inch) diam- eter rotors and larger, where high temperatures may develop. The cutting chambers have cooling channels to prevent over-heating that can cause smearing and meltdowns. Larger screens with areas equal to 50% of the ro- tor diameter, or 180 degrees, get more granulate through the cutting chamber more quickly for higher throughput without added horsepower. Conair claims this leads to better quality regrind, with the bigger screen area also resulting in fewer fines, as well as scissor-cut rotor and bed knives that can be easily adjusted to maintain tight tolerances relative to each other and the screen. Knife changes are claimed to be quick and easy, with knives designed to be adjusted in an outside jig on a workbench, rather than inside the cutting chamber. The blades are ‘pre-gapped’, so installa- tion is quicker and safer. The company adds that maintenance and


cleaning are easy due to tool-less front access, hinged, tilt-back hoppers (powered on large models), and drop-down screen cradles. Users have full access to the cutting chamber and screen area for adjustment and quick cleaning. Energy consump- tion is low with rotating sidewalls, integral roller bearings and a solid flywheel making for smooth, well-balanced operation, says the company.


www.injectionworld.com


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