Molding device

A molding device comprising a mold, a plate, and a ring, wherein

• the mold comprises:
• a lower surface,
• an upper surface parallel to the lower surface,
• a hole in a part of the upper surface, and
• a through hole extending from a bottom surface of the hole to the lower surface of the mold;
• the plate comprises a surface with a gas outlet;
• the ring is a separate member from the plate and the mold;
• the surface of the plate includes a first recess corresponding to a shape of the ring;
• the ring is in the first recess and an upper end of the ring protrudes out from the surface of the plate;
• the ring and the first recess have a circular ring shape centered on a center axis which extends through a center of the hole and is orthogonal to the lower surface of the mold;
• a radius from the center axis to an outer circumference of the ring is equal to a radius from the center axis to an inner circumference of the first recess;
• the ring is between the lower surface of the mold and the surface of the plate and connects the mold and the plate;
• the ring surrounds the through hole on the lower surface of the mold and the gas outlet on the surface of the plate;
• and
• in a region where the ring is not, a space is between the lower surface of the mold and the surface of the plate.