Process for classifying particulate hydrophilic polymer and sieving device
AssigneeNippon Shokubai Co., Ltd.
InventorsHiroyuki Kakita, Tatsuo Maruo, Sumio Okuda, Takumi Hatsuda
Life of this patent
Estimating the term…
Abstract
The present invention provides a process for classifying a particulate hydrophilic polymer and a sieving device, which can carry out a classification in a small separation particle diameter with high efficiency and exhibit classification ability inherent in the sieving device. The process comprises the step of classifying a particulate hydrophilic polymer in dry particle size with a sieving device, wherein the sieving device is used in a heated and/or thermally insulated state. The sieving device comprises a thermally insulating means.
Claims6
A water-absorbent resin particulate sieving process comprising the steps of:
- a) selecting water-absorbent resin particulates, with said water-absorbent resin particulates being at a temperature between 40 and 100.degree. C.;
- b) supplying a sieving device of which the temperature is maintained at or above a temperature lower than the temperature of said water-absorbent resin particulates by 20.degree. C.;
- and
- c) sieving the water-absorbent resin particulates with the mesh of the sieving device, with the step of sieving the water-absorbent resin particulates being conducted while the temperature of the sieving device is maintained at or above a temperature lower than the temperature of said water-absorbent resin particulates by 20.degree. C.
Dependencies are inferred from the claim text.