The application of various inorganic binders was tested in the foundry of a German automobile manufacturer.

A mixer existing in the core shop was employed to prepare the core sand. But problems were encountered during the core shooting process the reason for which was found in inhomogeneous core sand mixtures.

Not so with the application of a KLEIN core sand mixer STATORMIX by means of which these core shooting problems did not occur.

The proven double-chamber mixing process of the STATORMIX was analysed and optimised in the KLEIN test department with a view to inorganic binders.

Instead of the expected bending strength of approx. 400 N/cm² the mixing process with an inorganic binder consisting of three liquid components by means of the STATORMIX resulted in approx. 540 N/cm² Consequently the binder consumption can be reduced considerably. Core sand containing less humidity can be better shot and the drying expenditure is reduced. The diagram illustrates the achieved bending strength depending on the added amount of binder.

The STATORMIX also proved reliable in the core shooting shop of several foundries working with inorganic binders consisting of powdery components.

Thanks to the tightly closed double-chamber and the very short cycle times loss in humidity of the mixed batch and consequently loss of bending strength of the shot cores is reduced.

In addition to the outlined advantages the mixing chamber of the STATORMIX was kept clean by means of the integrated cleaning system.

Inorganic binder and the STATORMIX go together very well!