Extruder and method for manufacturing strand

A method for manufacturing a strand, the method comprising the following features (I) to (IV):

• (I) rotating a screw by a driving unit, extruding a raw material kneaded by the rotation of the screw from a die, and thereby discharging the raw material as the strand, the screw being housed in a cylindrical cylinder extending in one direction, and configured to rotate around a rotation axis extending in the one direction, the drive unit being disposed at one end of the cylinder, and the die being disposed at the other end of the cylinder;
• (II) adjusting a flow-velocity distribution of the raw material flowing into the die by an adjustment unit disposed between the cylinder and the die;
• (III) detecting a discharge amount of the strand discharged from the die;
• and
• (IV) performing feedback control for the flow-velocity distribution based on the discharge amount.