The particle-size distributions of WWFs with varying mean particle sizes (MZ) are shown in Fig. 1. The MZ of WWF decreased
from 125-mm to 43-mm with the increase in grinding time from 5 min to 20 min. These results indicated that compared to the reconstituted WWF by fine grinding of millfeeds using a lab mill grinder, superfine grinding was more effective to reduce
the particle size of WWF and wheat bran.