“The weighing function of the mixer ensures

accurate recording of the weight of each component fed in, to guarantee correct dosing according to the recipe. As the Mix-A-Lot is of vacuum and pressure-resistant design, direct pneumatic feeding is possible without the need for a separate reception bin for pneumatic conveying. This simplified plant concept allows the reduction of investment and maintenance costs compared to conventional systems,” according to Rumschik. He says cleaning during changes of product is also greatly reduced and much less space is required above the extruder. Coperion says a Mix-A-Lot 400 (useable volume

of 400 litres) has now also been installed in its test centre in Weingarten/Niederbiegen in Germany and is available for tests on an industrial scale. It has a throughput of up to 1.5 tonnes/h and has been equipped with a special mixing tool, which permits individual adjustment to optimise the mixer to the requirements of the application. For example, the gap to the housing and inclination and geometry of the paddles can be varied. The mixer is fed by two conveying lines through vacuum conveying from a big bag emptying station, container emptying station or suction nozzle. The Ploughshare laboratory mixer type L1 is the smallest contained mixing machine from Germany- based Lödige Process Technology, offering a drum volume of only one litre. According to the company, the machine was developed in response to an enquiry from an existing customer for a solution for handling challenging dry mixtures in its development laboratory. The powdered substances to be handled were sensitive, expensive or hazardous, meaning the solution had to contain the mixing process in a gas-tight container, referred to as a ‘glovebox’. The compact L1 Ploughshare laboratory mixer is a special addition to the L series, which is Lödige’s laboratory range for small batches. These machines are designed for development and small batch production and are available in several sizes with drum volumes generally ranging from 5-50 litres. The company says that, like other Ploughshare batch mixers, the mixers use the established

The Ploughshare L1 is the smallest contained laboratory mixer from Lödige Process Technology

Lödige mixing process, which involves generation of a fluidised bed.

Updating equipment US-based B&P Littleford reports significant market activity for both batch and continuous mixing systems at the current time, with many companies considering updating equipment. The company — which supplies a number of products for the plastics and PVC markets including the TriVolution Compounder, Continuous Kneader, Twin Screw Compounder, Vertical High Intensity Mixer, and Littleford Plow mixer – says that it also sees a switch from batch to continuous production. Another current trend is a growing interest in processing temperature-sensitive materials produced from bio-renewable sources. According to the company, the versatility of the

TriVolution and Plow mixer lends these machines to speciality applications. The Littleford Plow can operate as both a continuous or batch mixer, as well as at atmosphere, under deep vacuum and as a pressure vessel. The TriVolution kneader was originally designed for continuous compounding of PVC. However, with modifications, it can be adapted to process low and high viscous liquids. The company says it is adapting its product

Above: Schematics showing dispersive mixing on the leading edge of a kneading flight and distributive mixing as the material is split on the kneading flight tip in B&P Littleford’s TriVolution kneader

56 COMPOUNDING WORLD | November 2020



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