Bottle can member, bottle, and thread forming device

A bottle can member which is made of metal in a cylindrical shape with a bottom section comprising:

• a thread section on a mouth section comprising:
• an outer diameter of the thread section which is formed on the mouth section is 28 to 38 mm;
• a thickness of the thread section is 0.25 to 0.4 mm;
• an effective thread number of the thread section is 2.0 to 2.5;
• a height “h” from a starting point of the thread in the thread section to an upper end surface of the mouth section is set to be in a range of 3.6≦h≦4.68 mm;
• and
• a curl section including an outermost diameter section,
• wherein an outer surface of the outermost diameter section defines a uniform and outermost diameter of the curl section with reference to a central axis of the bottle can member, and wherein a tangent plane along the outer surface of the outermost diameter section is substantially parallel to the central axis of the bottle can member, and
• wherein a height of a first thread in the thread section set to be lower than a height of a second thread in the thread section.

A DI can member which is made of metal in a cylindrical shape with a bottom section comprising:

• a thread section on a mouth section comprising:
• an outer diameter of the thread section which is formed on the mouth section is 28 to 38 mm;
• a thickness of the thread section is 0.25 to 0.4 mm;
• an effective thread number of the thread section is 2.0 to 2.5;
• and
• a height of a first thread in the thread section is set to be lower than a height of another thread.