Plymouth, MN-based Buhler Inc. recently held its second annual open house, a four-day event attended by customers from the U.S. and Canada that highlighted the company’s newest wet grinding product – the ZR 120 centrifugal bead mill.      Based on the recirculation principle, the ZR 120 is capable of achieving narrow particle size and grinding results in the nanometer range, according to the company.      In addition, the ZR 120 is suitable for applications including liquid printing ink, i...