PROBLEM TO BE SOLVED: To granularly refine a granular object in a preparation process of fluid of including the granular object.SOLUTION: A kneader comprises a rotary blade for mixing a granular object and liquid inputted in a container and a driving mechanism for imparting rotation to this rotary blade in the container, and the length up to the tip from the center line of rotation of the rotary blade is formed longer than a minimum distance between the center line of its rotation and an inner wall of the container and shorter than a maximum distance between the rotation center line and the inner wall of the container, and a part for contacting with the inner wall of at least the container of the rotary blade is formed of a flexible material.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2016,JPO&INPIT【課題】粒状物を含む流動体の調製の過程で、前記粒状物を細粒化することを課題とする。【解決手段】容器内に投入された粒状物と液体とを混ぜ合わせる回転羽根と、この回転羽根に、前記容器内において回転を与える駆動機構とを備える混練装置において、前記回転羽根の回転の中心線から先端までの長さは、その回転の中心線と容器の内壁との最小距離よりも長く、かつ前記回転中心線と容器の内壁との最大距離よりも短く形成され、前記回転羽根の少なくとも容器の内壁に接触する部分は可撓性材料により形成される。【選択図】図1
