METHOD FOR DRYING POLYOLEFIN-CONTAINING PARTICLES AND METHOD FOR STORING POLYOLEFIN-CONTAINING PARTICLES

A method for drying or storing polyolefin-containing particles, the method comprising a drying step of supplying polyolefin-containing particles to a drying container and drying the polyolefin-containing particles in the drying container, wherein in the drying step, a value determined by the following formula (a) is -0.20 or more and 1.05 or less.Formula (a): 0.00304 x apparatus diameter [m] + 0.00261 x bed height [m] + 0.0179 x residence time [hr] + 0.00213 x particle temperature in drying container [K] - 0.0109 x inclination angle [degree] + 0.0212 x CXS component amount [% by mass](in formula (a),the apparatus diameter represents a maximum diameter of a body portion of the drying container,the bed height represents a maximum height from a height of a discharge port for discharging the polyolefin-containing particles to a height at which the polyolefin-containing particles retained in the drying container are located,the residence time represents a time during which the polyolefin-containing particles are retained in the drying container,the particle temperature in the drying container represents a temperature of the polyolefin-containing particles in the drying container,the inclination angle represents an external angle formed by an inclined surface of the drying container and an installation horizontal surface of the drying container, the external angle referring to an angle on an outer side of the container, and the CXS component amount represents a content of the CXS component in the polyolefin-containing particles.)