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Using an experimental piston type extruder, the extrusion characteristics of clays from Westerwald deposits in West Germany were compared with those of a domestic Kibushi clay. Both clays showed a linear relationship between the logarithm of extrusion pressure and solid volume fraction with similar gradients. It was found, however, that the clay from the Westerwald deposits can be formed under much lower pressure than that of the domestic Kibushi clay. Thus, the observed difference in extrusion behavior is probably dependent on the specific surface area, constituent minerals and the particle orientation during extrusion.

Characteristics of Clays from the Westerwald Deposits in West Germany (Part 1)