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ALTERNATIVE COMPOUNDERS | MACHINERY


While most compounders use twin-screw equipment there are other options, each of which has its own specific benefits to offer.Peter Mapleston finds out more


Compounders with a real difference


The twin-screw extruder is the de-facto choice of equipment for most plastics compounding operations. But it is not the only option and compounding companies should – and do – cer- tainly consider alternatives such as kneaders, continuous mixers, and multi-screw systems before laying down their hard-earned cash. There is a lot to be said for sticking with a technology your company and staff are familiar with, but there is also truth in the argument that one technology can not always be the best for every situation. This article takes a look at what is going on outside of the twin-screw world. Swiss company Buss is the big name in kneader


extruders and it will show two new additions to its Compeo line at K2019 in Düsseldorf later this month. The Compeo 88 and Compeo 110 join the smaller Compeo 55, which was debuted last year. All three models are available with process lengths


www.compoundingworld.com


from 13 to 25 L/D, the model size indicating the screw diameter in millimetres. Typical throughputs for processing thermoplastics are 150-300 kg/h for the Compeo 55, 600-1200 kg/h for the Compeo 88, and 1,200-2400 kg/h for the Compeo 110. The Compeo 110 on view at K will be configured with an 18 L/D processing unit and a downstream side feeder alongside the company’s new conical twin-screw discharge unit. In this configuration the system is suitable, among other things, for com- pounding filled and reinforced thermoplastics, including natural fibre-reinforced and bio-based plastics as well as HFFR cable compounds. The 25 L/D Compeo 88, meanwhile, is optimised for compounding black or coloured masterbatches. It can be fitted with one or two additional side feeders.


Advantages cited by Buss for Compeo com- pounders include their ability to carry out high-


October 2019 | COMPOUNDING WORLD 79


Main image: The processing section of the Buss Compeo kneader extruder can combine two, three, four and six flight elements


PHOTO: BUSS


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