Rotator

A manufacturing method of a rotator configured to be accommodated in a casing of a pump for sucking a fluid into the casing and discharging the fluid outside of the casing, the manufacturing method comprising:

• filling molten resin in a rotator forming space of a mold having a gate and the rotator forming space by injecting the molten resin from the gate of the mold;
• and
• forming the rotator by cooling the resin in the rotator forming space, wherein
• the mold comprises:
• an insert portion forming member in the rotator forming space, the insert portion forming member configured to form an insert portion configured to insert a rotating shaft;
• and
• a communicating opening forming member configured to form one or more communicating openings disposed in a vicinity of the insert portion and piercing the rotator in a direction along the rotating shaft, and
• the filling of the molten resin includes flowing the molten resin in the rotator forming space along an axis direction of the insert portion forming member and the communicating opening forming member;
• wherein the molten resin includes a plurality of fibers, the flowing such that a portion of the plurality of fibers extends in a direction of the rotating shaft in the insert portion, a part of the plurality of fibers is located closer to a rotating center of the rotator than each of the one or more communicating openings, and another part of the plurality of fibers is located farther from the rotating center of the rotator than each of the one or more communicating openings.