| 摘要 |
The present invention is directed to a method for production of granulated bean paste or "miso", wherein uncooked bean paste material is extruded in the form of string by means of an extrusion-granulator into a space held in vacuum condition of an order of several hundred pascals (Pa). Then, in order for this material to be desiccated under the vacuum, it is subjected to semi-dried state with a low moisture content, which enables the starting bean paste material to retain its plasticity. This semi-drying of the bean paste material is sufficiently conducted so as to adequately regulate homogeneity and uniformity of the water content in the semi-dried bean paste material in a manner not to cause deterioration in the material quality. In order to secure the good quality of the bean paste material, the method of producing the granulated bean paste according to the present invention comprises: a first step of subjecting the starting material bean paste to semi-dried state by means of a vacuum freeze-dryer to enable the bean paste material to retain its low moisture content to its plastic limit; a second step of charging this semi-dried bean paste material in a isothermal chamber to homogenize the water content therein at a temperature in the range of from 15° C. to 20° C. for a period of a few days; and a third step of extruding the semi-dried bean paste material with its water content being homogenized into an extruding chamber maintained at a predetermined degree of vacuum, by means of an extrusion-granulator, and then cutting and breaking the bean paste material as extruded into the extrusion chamber to obtain fine particles of granulated bean paste by means of a cutting knife disposed in the extruding chamber, and rotating at a high speed.
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