| 摘要 |
The invention provides a treating method of forming a protection layer having strong abrasion resistance and oxidation resistance and having a thickness of micron order of a surface of a polished grain-or a processed granular material obtained by kneading and solidifying a starch so as to make it hard to be changed in quality, thereby improving a storage capacity for a long time. Further, the invention provides a treating method of forming a fine particulate starch attached to the grain or the granular material into a paste state so as to combine with the protection layer. The surface treating method has a step of applying a high humidity hot wind to the polished grain or the granular material so as to heat a surface layer portion, a step of forming a starch in the heated portion into a paste state and further making the starch into an alpha state, and a step of cooling and forming a fine layer of the alpha starch on the surface portion. <IMAGE> |
