Classification and Dispersion Performance of a Two-Roll Mill

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  • 二本ロールミルの分級と分散性能
  • 2本ロールミルの分級と分散性能
  • 2 モト ロールミル ノ ブンキュウ ト ブンサン セイノウ
  • 3本ロールミルの分級と分散性能
  • 3 ボン ロールミル ノ ブンキュウ ト ブンサン セイノウ
  • Classification and Dispersion Performance of a Three-Roll Mill

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Classification effect and dispersion performance of a two-roll mill were investigated with a simulation model and experiments. The comminution kinetics theory was applied to the simulation model and the breakage function and a new parameter of rate of particle passed through the nip were used. In the experiment, fly ash, umber and chalk were used as pigments and linseed oil varnish as a vehicle. The breakage function and the rate of particle passed through the nip were determined from the experiment. The changes of minimum nip clearance, scraped sample density, particle size distributions and grind gauge values were measured.<BR>The breakage function and the rate of particle passed through the nip were correlated by a ratio of particle size to minimum nip clearance. The rate of particle passed through the nip was also changed with particle weight fractions. Simulated results with these parameters are able to represent the changes of minimum nip clearance and scraped sample density, and the particle size distribution and the grind gauge value after dispersion. The ratios of grind gauge value after dispersion to that before dispersion were well correlated by the ratio of minimum nip clearance to grind gauge value before dispersion with a single curve independently of roll speed, vehicle viscosity, particle size level and particle volume fraction.

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