Injection unit and injection molding method

摘要

An injection unit capable of increasing the amount of a molding material flowing between a mold unit and a nozzle is provided. An injection unit includes: a first cylinder (20); a first movable section (22) which moves a molding material in the first cylinder (20) ; a first drive section (24) which operates the first movable section (22); a second cylinder (30) to which the molding material is fed from the first cylinder (20) ; a second movable section (32) which moves the molding material in the second cylinder (30); a second drive section (34) which operates the second movable section (32); a nozzle (40) which injects the molding material into a mold unit; a switching section (50) which switches a flow direction of the molding material between the first cylinder (20), the second cylinder (30), and the nozzle (40) ; and a controller (70) which controls the first drive section (24), the second drive section (34), and the switching section (50), wherein the controller (70) opens the switching section (50) to the first cylinder (20), the second cylinder (30), and the nozzle (40) and drives the first drive section (24) and the second drive section (34) at the same time, at a predetermined time.