After 15 years, Saika finally achieved his dream with the development of a rice polisher that can remove bran residue from the surface of rice grains without having to rely on water. The process uses the adhesiveness of the bran itself to remove it.
Although there are other ways to remove the bran from rice, 70 percent of the prewashed rice market uses Saika's "bran-grind" process, according to his firm.
Rough rice is processed to obtain white, or polished, rice through a series of procedures: cleaning, parboiling, hulling, pearling, polishing and grading. Parboiling or steeping of cleaned rice in hot water facilitates hull removal and improves the durability of the grain.
However, previous study showed that rotary sifter broken paddy separator needed improvement both in the separation accuracy for large and small broken kernels and in the separation precision for small broken kernels and foreign materials (Kim, 2001). A rotary sifter, alternatively called a plan sifter or swing sieve, is a compact hexahedral steel box swinging circularly on horizontal plane and contains a vertical stack of six to eight screen trays with different mesh sizes (Food Agency, 1995). Judging from this configuration, the rotary sifter broken rice separator has little theoretical soundness because effective broken rice separation should be done by the kernel length not its width.