A large global specialty ink manufacturer contacted Union Process looking for an improved way to grind its viscous product efficiently. The customer had previously purchased several production-size S-200 batch mills and was now looking for additional milling solutions for handling larger batches. After successful pilot studies of a QL-6, the customer and Union Process developed a special QL-100. The mills are high circulation, high flow mills distinguished by their high pumping rates which result in a faster grind and a narrower particle size distribution. With the circulation process, the material makes multiple passes through the grinding chamber until the desired particle size is obtained.