Sprue bush and bush component thereof

A bush component for a sprue bush configured to include a sprue bush main body that has a flow passage, through which synthetic resin injected from an injection molding nozzle flows, and a recessed portion formed in a surface of the sprue bush main body on a synthetic resin injection port side thereof, and the bush component, which is embedded in the recessed portion,

• the bush component comprising:
• a nozzle contact surface that is contacted by the injection molding nozzle;
• a through hole that extends from an opening in the nozzle contact surface and communicates with the flow passage in the sprue bush main body so as to form the flow passage for the synthetic resin;
• and
• a plurality of ribs that extend radially outward from a peripheral surface of the through hole.

A sprue bush attached to a mold used to mold synthetic resin, formed by coaxially integrating a disc-shaped head and a columnar shaft having a smaller diameter than the head, a flow passage, through which synthetic resin injected from an injection nozzle flows, being formed in an axial center that extends from the head to the shaft,

• the head including:
• a nozzle contact surface that is contacted by the injection molding nozzle and includes an opening into the flow passage;
• a hollow region that is formed in the interior of the head on a rear surface side of the nozzle contact surface so as to surround the flow passage in a ring shape;
• and
• a plurality of ribs that extend radially toward the hollow region from a peripheral surface of the flow passage.