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21.10.2019 Dehumidification and mixing for production of natural fibre compounds

MTI Mischtechnik, Detmold, Germany, has developed an MTI Flex®-line heating/cooling mixer combination which – together with a Vent tec® 2.0 aspiration system – has been optimised for the production of dry blends for natural fibre compounds (NFC). The system was exhibited this month at the K2019 trade show alongside the company’s current portfolio of container-type, vertical, horizontal, cooling, and heating/cooling mixers for the plastics industry.

Designed as a modular system, the mixers of the MTI Flex®-line series can generally be used for almost any application because the sizes, drives and equipment options can be individually configured. In the M 1000/K 3300 size shown at K2019, the mixing system comes with a heating mixer volume of 1101 litres and a cooling mixer volume of 3308 litres for typical batch sizes of 400kg and an hourly throughput of over 1600kg. It is part of a series of machines that are being delivered to an Asian NFC-processing company. 

The performance of the associated Vent tec 2.0 mixer aspiration system is matched to the intended NFC application. Unlike conventional solutions, these devices control their operation autonomously as a function of actual process parameters, thereby providing constant processing conditions irrespective of changes in process and ambient conditions. They achieve this by continuously monitoring all actual operating conditions via key parameters such as intake air and system air temperatures, air pressure, humidity and, importantly, the aspiration air flow rate. Their electronic controller continuously analyses these variables and adjusts the aspiration system accordingly with due regard to filter status, thereby maintaining constant venting airflow conditions. Thanks to the high drying efficiency, the required preparation times, depending on the raw material moisture content, are usually less than 15 minutes.


An MTI Flex-line heating/cooling mixer equipped with a Vent tec 2.0 aspiration system, adapted for production of natural fibre compounds

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