Apparatus and method for forming container and container

A container forming apparatus for forming a container by hot forming, comprising:

• a first mold including a main-body forming part configured to form a main body of the container, a skirt forming part extending upward from the main-body forming part to form a skirt of the container, and a flange forming part extending from an upper end of the skirt forming part in a direction toward the outside to form a lower surface of a flange of the container;
• and
• a second mold provided over the first mold and vertically movably installed to press an upper surface of the flange, the second mold including a pressing surface configured to press down on a sheet, which is to be formed into the flange, in a location corresponding to the flange forming part,
• wherein the pressing surface includes an extension that is a portion further extending in a direction toward the center of the main-body forming part beyond an inner end portion of the flange forming part and configured to form a protrusion protruding on an inside surface of the skirt,
• wherein the pressing surface is formed in a curved-surface shape, and the extension extends to form a curved surface having the same radius of curvature as the pressing surface,
• wherein the skirt includes, on an outside surface of an upper end portion of the skirt, a groove concavely formed along a circumferential direction of the outside surface of the upper end portion of the skirt,
• wherein the skirt forming part includes a protrusion protruding along a circumferential direction of the upper end of the skirt forming part to form the groove,
• wherein the skirt forming part is formed to be inclined in a direction toward the center of the main-body forming part as the skirt forming part extends upward in an area between an upper end of the main body forming part and a lower end of the protrusion, and
• wherein on a vertical cross-section of the first mold and the second mold, a distance from a line vertically extending from an inner end portion of the extension to a line vertically extending from the inner end portion of the flange forming part is formed to be 1 mm to 5 mm.