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Coarse white polyethylene particles were coated by fine pigment particles of red iron oxide by high-speed rotational impact blending and by hand mixing in a mortar. As the dark pigments became progressively distributed over the coarse particle surfaces, the color characteristics of the resulting powder changed. First, the effects of the mixing ratio of fine particles, the treatment time, the rotational speed of a rotor and the mean diameter of coarse particles were investigated with respect to the degree of mixing of the total mixture. The value of the degree of mixing was determined directly and precisely by chemical analysis. It was found that the degree of mixing increased with the treatment time at a certain mixing ratio of fine particles, corresponding to a coating ratio over coarse particles of less than 100% of closest packing on a number basis, but decreased at the mixing ratio of more than 100% by rotational impact. Micromixing to coat individual coarse particles was more easily and rapidly achieved by rotational impact blending as compared with hand mixing. Coating coarser particles at higher rotor speeds was more suitable for achieving homogenous mixing. In addition, it was found that the lightness of mixed particles decreased to lower than that by hand mixing due to the increased degree of mixing, but remained almost constant during the process of rotational impact blending, with its slight increase being due to embedment of fine particles by frequent impact. This means that the lightness of particles reached a steady state in a very short mixing time, resulting in the reduction of the amount of fine particles for the same lightness effect when using the high-speed rotational impact blender.

Mixing and Lightness Characteristics of Fine Particles Coated by High-Speed Rotational Impact Blending.