KREYENBORG Infra-red drum: second generation successfully started
Apart from further detail improvements, a completely revised infra-red module combined with a new control philosophy is the highlight of this new dryer generation. In close cooperation with the subsuppliers, an innovative infra-red module has been designed. The individual infra-red radiators dispose of an integrated reflector out of aluminium oxide ceramics. The lining of the air-cooled module itself is executed with a functional ceramics. Owing to the thermally and fluidicly optimised infrared modules, the reliability and lifetime of the modules have been clearly increased. Regarding the control, the partner BSG Bruckmann Steuerungstechnik GmbH,a famous control control manufacturer, had been engaged with the further development of the control. The result is an intuitively operatable touch-screen control with optimised temperature control. Apart from the comfortable possibilities of the new control, the further advantages are the integration possibilities of the dryer into complete lines and the possible online service via modem.
Up to now the main application of the KREYENBORG infra-red drums ist he drystallisation and drying of PET ground stock. In addition to the possibility to realise both tasks in one processing step, there is also the possibility to reduce input moistures, being in the range of percent, to an output moisture of up to 300 ppm, with re-drying bin even less than 50 ppm. The infra-red drums are used for the processing of bottle ground stock and film flakes in flat sheet lines and lines for packaging straps.
However outstanding results are also achieved with the drying and crystallisation of PLA ground stock. Owing to the low crystallisation temperature and the strong tendency to conglutinate, it is hardly possible to bring back this material into the production process. Here the decisive advantage of the infra-red rotating drum ist hat the material, which has to be dried, will be kept in constant motion owing to the permanent mixing in the rotating drum. World-wide currently already four machines have been commissioned for this field of application.
Owing to the energy saving and the permanent mixing during drying this technology is also very interesting for further applications. Besides the use in the plastics processing the infra-red dryers are also suited for the processing of nearly all free flowing bulk goods, so that the application possibilities are almost unlimited. For the testing of new procedures Kreyenborg has a labline with several dryer models with different throughput capacities at ist disposal. As energy saving alternative to conventional drying systems the infra-red technology offers a number of new possibilities for most variable branches of industry.
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