| 摘要 |
PROBLEM TO BE SOLVED: To provide a dehydrator in a twin-screw extruder capable of increasing dehydration efficiency using a pair of discs with helical grooves as a screw piece for returning at a dehydration part screw.SOLUTION: In a dehydrator in a twin-screw extruder where: a twin-screw (2) exists in a longitudinal cylinder (21) connected with a plurality of cylinder parts (1A, 22, 1, 23, 24 and 25) in series; and water in a water-containing thermoplastic resin raw material (50) is squeezed by a dehydration part screw (31) in the twin-screw (2), a screw piece (29) for returning located at the dehydration part screw (31) has a plurality of helical grooves (40) on an outer periphery and is made of a pair of discs (29A and 29B) with helical grooves partially overlapping each other viewing from an axial direction. |
