Two shafts generate more mixing action than one: BHS twin-shaft batch mixers replace single-shaft mixers

摘要

Baumit GmbH, a company of the Schmid Industrieholding Group, produces its entire, wide range of dry building materials in various mixing lines operated at the Wopfing site. The company's old mixing technology had reached a point where it was no longer able to keep up with the demands of modern, innovative products. For example, lightweight particles rose to the top when mixing dry mortar mixtures for insulation systems. Moreover, the rapidly moving mixing units of the legacy machines destroyed fragile particles or altered the grading curve of the sand. This gave rise to a search for a new solution. Another goal was to optimize the production capacity to meet current requirements. The decision was made in favour of installing dry powder batch mixers from BHS Sonthofen. As a result, the first mixer of the type DMX 4900 with an active volume of 4400 l was installed in the Wopfing North plant in the winter of 2014/15 (> Fig. 1). Owing to highly satisfactory results, a second mixer of the same type was commissioned just one year later.