METHOD FOR MANUFACTURING WATER ABSORPTION TREATMENT MATERIAL

1 . A method for manufacturing a water absorption treatment material, comprising:

a core portion forming step of forming a core portion in a granular shape;

a coating portion forming step of forming a coating portion so as to cover the core portion; and

a coating portion removing step of removing a part of the coating portion.

2 . The method for manufacturing a water absorption treatment material according to claim 1 ,

wherein in the coating portion forming step, the coating portion is formed by attaching a coating material to the core portion.

3 . The method for manufacturing a water absorption treatment material according to claim 2 ,

wherein in the coating portion forming step, the coating material is attached to the entire periphery of the core portion.

4 . The method for manufacturing a water absorption treatment material according to claim 1 ,

wherein in the coating portion removing step, the coating portion is removed such that the core portion is exposed at a portion where the coating portion is removed.

5 . The method for manufacturing a water absorption treatment material according to claim 4 ,

wherein in the coating portion removing step, the coating portion is removed such that a region of 10% or more of a periphery of the core portion is exposed.

6 . The method for manufacturing a water absorption treatment material according to claim 5 ,

wherein in the coating portion removing step, the coating portion is removed such that a region of 30% or more of the periphery of the core portion is exposed.

7 . The method for manufacturing a water absorption treatment material according to claim 1 ,

wherein in the core portion forming step, the core portion in an approximately circular column shape having a side surface and first and second bottom surfaces is formed.

8 . The method for manufacturing a water absorption treatment material according to claim 7 ,

wherein in the core portion forming step, the core portion is formed through extrusion granulation.

9 . The method for manufacturing a water absorption treatment material according to claim 7 ,

wherein in the coating portion forming step, the coating portion is formed on the side surface, and the first and second bottom surfaces of the core portion.

10 . The method for manufacturing a water absorption treatment material according to claim 9 ,

wherein in the coating portion removing step, at least a part of the coating portion formed on the first bottom surface of the core portion is removed.

11 . The method for manufacturing a water absorption treatment material according to claim 10 ,

wherein in the coating portion removing step, the coating portion is removed such that a region of 80% or more of the first bottom surface of the core portion is exposed without being covered by the coating portion, while the coating portion is left on a region of 80% or more of the side surface of the core portion.

12 . The method for manufacturing a water absorption treatment material according to claim 11 ,

wherein in the coating portion removing step, the coating portion is removed such that the entirety of the first bottom surface of the core portion is exposed without being covered by the coating portion, while the coating portion is left on the entirety of the side surface of the core portion.

13 . The method for manufacturing a water absorption treatment material according to claim 10 ,

wherein in the coating portion removing step, the coating portion formed on the first bottom surface is removed by cutting off an end portion on the first bottom surface side of the core portion.

14 . The method for manufacturing a water absorption treatment material according to claim 9 ,

wherein in the coating portion removing step, at least a part of the coating portion formed on the second bottom surface of the core portion is removed.

15 . The method for manufacturing a water absorption treatment material according to claim 14 ,

wherein in the coating portion removing step, the coating portion is removed such that a region of 80% or more of the second bottom surface of the core portion is exposed without being covered by the coating portion, while the coating portion is left on a region of 80% or more of the side surface of the core portion.

16 . The method for manufacturing a water absorption treatment material according to claim 15 ,

wherein in the coating portion removing step, the coating portion is removed such that the entirety of the second bottom surface of the core portion is exposed without being covered by the coating portion, while the coating portion is left on the entirety of the side surface of the core portion.

17 . The method for manufacturing a water absorption treatment material according to claim 14 ,

wherein in the coating portion removing step, the coating portion formed on the second bottom surface is removed by cutting off an end portion on the second bottom surface side of the core portion.

18 . The method for manufacturing a water absorption treatment material according to claim 1 ,

wherein in the core portion forming step, a plurality of the core portions are formed, and

in the coating portion forming step, the coating portion is formed so as to cover each of the core portions.

19 . The method for manufacturing a water absorption treatment material according to claim 18 ,

wherein in the coating portion removing step, the coating portion is removed by having the plurality of the core portions on which the coating portion is formed collide against one another.

20 . The method for manufacturing a water absorption treatment material according to claim 18 ,

wherein in the coating portion removing step, the coating portion is removed by having the plurality of the core portions on which the coating portion is formed rub against one another.