Extruder

Abstract

Inner cross-sectional areas of a pair of cylinders 21 and 22 in a direction perpendicular to a direction from a supply region AR1 to a kneading region AR2 is larger in the kneading region AR2 (cross-sectional area S2) than in the supply region AR1 (cross-sectional area S1) (S2>S1). Thus, a residence time of a resin raw material (resin pellets PR, molten resin MR) can be increased and processing capacity can be improved without increasing the size of an extruder 10, that is, without lengthening the pair of cylinders 21 and 22 and screws 50 and increasing the diameter of the pair of cylinders 21 and 22 and the screws 50. Therefore, it is possible to easily handle resin raw materials that require a longer residence time and use the extruder 10 for a wide range of melting and kneading applications.

Dependencies are inferred from the claim text.