with the Evactherm-Vakuummischer®

The Eisengießerei Karlshütte completely renewed its sand preperation plant and transport systems in 2003 / 2004. The company took the decision to use the leading innovative technology of a vacuum mixer which employs the Evactherm-Verfahren® (Evactherm method): all necessary steps in the process are combined and controlled in a single machine.

Sand conditioning in this manner has qualitative advantages over conventional sand conditioning. Apart from advantages in the technology of the plant itself, this method results in a good, even quality of moulding material in the sand despite fluctuating process parameters:

In the past, our increasing thermal charging of the sand led to a rise in the temperature of the used sand which in turn had a negative effect on the properties of the freshly conditioned moulding material (sand which was too dry) and led to many casting errors: It has been possible to reduce the new sand temperature from 90°C to a constant temperature between 35° C and a maximum 40° C. This is an indispensable prerequisite to achieve optimum moulding sand characteristics and defect-free cast pieces! 

And – last but not least – with this new plant we make a great contribution to the reduction of dust in the air and thereby, to improving environmental conditions.