| 摘要 |
PURPOSE:To obtain high-quality magnetic paint especially little in fluctuation between lots by performing agitation while keeping the temp. of the inner wall of the upper part of a closed vessel at the same temp. and above as the temp. of kneading material in a method for mixing and kneading powder while feeding a soln. into the closed vessel. CONSTITUTION:In a kneading equipment having agitation parts 15 in a closed vessel 11, both a heating means 18 for heating the inner wall of the upper part 12 of the vessel and a cooling means 14 for cooling the inner wall of the lower part 13 of the vessel are provided. For example, in case of kneading magnetic paint, a solvent is evaporated from kneading material 16 according to heat release of the material on agitation. In this case, the temp. of the inner wall of the upper part 12 is set higher than the temp. of the kneading material 16 by means of the heating means 18 and thereby the saturated vapor pressure of the upper part 12 is made higher than the saturated vapor pressure of the surface of the kneading material 16. Thereby, the solvent is prevented from being condensed and stuck on the inner wall surface of the upper part 12 and evaporation itself of the solvent incorporated in the kneading material 16 is inhibited and the flow of the solvent content from the inner wall surface of the upper part 12 is eliminated. further in case the temp. of the kneading material 16 is excessively raised and thereby the characteristics of the material are lowered, the temp. of the kneading material 16 is lowered by adjustment of the cooling means 14. |
