Method for producing particulate water—absorbing agent composed principally of water absorbing resin

A method for producing a particulate water-absorbing agent comprising:

• a polymerization step for obtaining a polymer gel;
• a drying step for drying the polymer gel to obtain a dried substance;
• a pulverization step for pulverizing the dried substance under a reduced pressure to obtain a particulate water-absorbing resin, wherein the reduced pressure is lower than atmospheric pressure by no more than 10 kPa;
• a classification step for sieving the particulate water-absorbing resin;
• a granule sizing step for granule sizing a particulate water-absorbing agent obtained from the particulate water-absorbing resin obtained in the classification step;
• and
• a transporting step for transporting the products produced in each of the steps to other steps.

A method for producing a particulate water-absorbing agent comprising:

• a polymerization step for obtaining a polymer gel;
• a drying step for drying the polymer gel to obtain a dried substance;
• a pulverization step for pulverizing the dried substance under a reduced pressure to obtain a particulate water-absorbing resin, wherein the reduced pressure is lower than atmospheric pressure by no more than 10 kPa;
• a classification step for sieving the particulate water-absorbing resin;
• a surface cross-linking step for cross-linking the neighborhood of the surface of the particulate water-absorbing resin obtained in the classification step to obtain a particulate water-absorbing agent;
• a packaging step for filling a packaging material container with the particulate water-absorbing agent for packaging;
• and
• a transporting step for transporting the products produced in each of the steps to other steps.

A method for producing a particulate water-absorbing agent comprising:

• a polymerization step for obtaining a polymer gel;
• a drying step for drying the polymer gel to obtain a dried substance;
• a pulverization step for pulverizing the dried substance under a reduced pressure to obtain a particulate water-absorbing resin, wherein the reduced pressure is lower than atmospheric pressure by no more than 10 kPa;
• a classification step for sieving the particulate water-absorbing resin;
• a surface cross-linking step for cross-linking the neighborhood of the surface of a particulate water-absorbing resin obtained in the classification step to obtain a particulate water-absorbing agent;
• a granule sizing step for granule sizing the particulate water-absorbing agent;
• a packaging step for filling a packaging material container with the particulate water-absorbing agent, obtained in the granule sizing step for packaging;
• and
• a transporting step for transporting the products produced in each of the steps to other steps.