Factors affecting fineness of mill base from grinding process

This work is conducted to study the factors affecting fineness of mill base from grinding process. Grind gauge meter is an important equipment used to measure fineness. Raw materials in the experiments consist of Titanium dioxide as pigment, acrylic resin as binder and Butyl Glycol Ether, N-Buthanol, Ethyl Glycol Acetate, Solvesso 150 as solvents. The mixing tank is made of steel and the grinding machine is sand mill with glass bead as grinding media. Variation factors are as follows: mixing time varied from 60 to 120 minutes, viscosity of mill base before grinding varied from 70 to 85 KU, flow rate of mill base varied from 16 to 20 kg./min., and grinding time varied from 3 to 8 hours. The results have shown that both mixing time and viscosity are seemed to positively grinding efficiency and grinding time. However, from the study, effect from flow rate conditions is insignificant. Also, grinding time is inverse proportional to fineness of mill base. One major finding from processing 2500 kilograms of mill base is that the most suitable grinding conditions are 120 minutes mixing time, 70 KU viscosity, 20 kg./min. flow rate, and 7 hours. 5 minutes grinding time. The condition mentioned has provided the benefit, in term of time saving, in mixing and grinding process.