Method and apparatus for manufacturing water absorption treatment material

1. A method for manufacturing a water absorption treatment material that is composed of a plurality of grains that bond to each other upon absorbing a liquid, the method comprising:

a granulation step of forming a substantially cylindrical granule that constitutes each of the grains by granulating a granulation material; and

a pressure application step of applying pressure to the granule formed in the granulation step from a longitudinal direction of the granule so as to reduce a length of the granule.

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

wherein, in the granulation step, the granule is formed using an extrusion granulation machine.

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

wherein, in the pressure application step, the length of the granule is reduced by 10% or more.

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

wherein, in the pressure application step, the length of the granule is reduced by 20% or more.

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

wherein, in the granulation step, the granule that has a length that is larger than a diameter of the granule is formed, and

in the pressure application step, the length of the granule is reduced such that the length of the granule is less than or equal to the diameter of the granule.

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

wherein, in the pressure application step, the length of the granule is reduced such that the length of the granule is 60% or more and 80% or less of a diameter of the granule.

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

wherein, in the pressure application step, by using a pressure application machine that includes mutually opposing first and second pressure application surfaces, the pressure is applied to the granule by moving the second pressure application surface closer to the first pressure application surface in a state in which a first end of the granule is in abutment with the first pressure application surface, and a second end of the granule is in abutment with the second pressure application surface.

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

wherein, in the pressure application step, the pressure is applied simultaneously to a plurality of the granules by moving the second pressure application surface closer to the first pressure application surface in a state in which the first ends of the plurality of the granules are in abutment with the first pressure application surface, and the second ends of the plurality of the granules are in abutment with the second pressure application surface.

9. The method for manufacturing a water absorption treatment material according to claim 1 , the method comprising:

a coating step of forming a coating portion so as to cover the granule formed in the granulation step.

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

wherein the pressure application step is performed prior to the coating step.

11. An apparatus for manufacturing a water absorption treatment material that is composed of a plurality of grains that bond to each other upon absorbing a liquid, the apparatus comprising:

a granulation machine that forms a substantially cylindrical granule that constitutes each of the grains by granulating a granulation material; and

a pressure application machine that applies pressure to the granule formed by the granulation machine from a longitudinal direction of the granule so as to reduce a length of the granule.

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

wherein the granulation machine is an extrusion granulation machine.

13. The apparatus for manufacturing a water absorption treatment material according to claim 11 ,

wherein the pressure application machine reduces the length of the granule by 10% or more.

14. The apparatus for manufacturing a water absorption treatment material according to claim 13 ,

wherein the pressure application machine reduces the length of the granule by 20% or more.

15. The apparatus for manufacturing a water absorption treatment material according to claim 11 ,

wherein the granulation machine forms the granule that has a length that is greater than a diameter of the granule, and

the pressure application machine reduces the length of the granule such that the length of the granule is less than or equal to the diameter of the granule.

16. The apparatus for manufacturing a water absorption treatment material according to claim 11 ,

wherein the pressure application machine reduces the length of the granule such that the length of the granule is 60% or more and 80% or less of a diameter of the granule.

17. The apparatus for manufacturing a water absorption treatment material according to claim 11 ,

wherein the pressure application machine includes mutually opposing first and second pressure application surfaces, and applies the pressure to the granule by moving the second pressure application surface closer to the first pressure application surface in a state in which a first end of the granule is in abutment with the first pressure application surface, and a second end of the granule is in abutment with the second pressure application surface.

18. The apparatus for manufacturing a water absorption treatment material according to claim 17 ,

wherein the pressure application machine applies the pressure simultaneously to a plurality of the granules by moving the second pressure application surface closer to the first pressure application surface in a state in which the first ends of the plurality of the granules are in abutment with the first pressure application surface, and the second ends of the plurality of the granules are in abutment with the second pressure application surface.

19. The apparatus for manufacturing a water absorption treatment material according to claim 11 , the apparatus comprising:

a coating machine that forms a coating portion so as to cover the granule formed by the granulation machine.

20. The apparatus for manufacturing a water absorption treatment material according to claim 19 ,

wherein the application of the pressure by the pressure application machine is performed prior to the formation of the coating portion by the coating machine.