EXTRUSION DRYER FOR RUBBERY POLYMER, DRYING METHOD OF RUBBERY POLYMER, AND PRODUCTION METHOD OF RUBBERY POLYMER

摘要

An extrusion dryer for a rubbery polymer includes a cylinder equipped with a hopper for injection of the rubbery polymer at one end and a die at the other end. A screw is rotatably arranged inside of the cylinder, the screw having a shaft and a spiral flight formed on an outer surface of the shaft. The shaft includes multiple zones, each including a conveyance section and a compression section. In the zone closest to the die, the outer diameter of the shaft at the conveyance section is smaller than the outer diameter at the compression section.