Method of manufacturing water absorbing resin and drying apparatus used for the method

摘要

A method of making water absorbing resin according to the present invention includes a polymerization step for producing a water absorbing resin by reverse-phase suspension polymerization; and a drying step for drying the water absorbing resin obtained in the polymerization step. In the drying step, the drying is made by using a dryer (X 1 ) which includes: an end wall ( 21 ), an opposite end wall ( 22 ), a circumferential wall ( 23 ) and a rotation shaft ( 24 ) between these end walls, stirring means ( 25 ) provided in the rotation shaft ( 24 ) for stirring the water absorbing resin while moving the resin from the end wall ( 21 ) to the end wall ( 22 ), and stirring means ( 26 ) provided in the rotation shaft ( 24 ) between the stirring means ( 25 ) and the end wall ( 22 ) for stirring the water absorbing resin while moving the resin from the end wall ( 22 ) to the end wall ( 21 ).