Patent ID: 9533433
Date: 2017-01-03
CPC Classifications: A61L,B01J,B29B,B29C,B29K,C08J

Claim:
1. A gel grinding device to be used to produce a water absorbent resin, comprising: a screw; a feed opening; an extrusion opening; a porous plate; and a barrel, the screw including: the screw satisfying either one of the following (1) and (2): where B is a cross-sectional area of the rotating shaft which cross-sectional area is obtained by cutting off the screw vertically to a direction in which a gel of the water absorbent resin is extruded; A is a cross-sectional area of a rotating part of the flight; N is a maximum inner diameter which prevents a contact between the screw and a return preventing member which is provided inside of the barrel; and F is a width of the flight which width is along a direction vertical to a direction in which the flight extends.