Sealing cap and detaching method of sealing cap

A detaching method of a sealing cap used for sealing a plug attached to an opening of a liquid container,

• wherein the sealing cap comprises
• a body having a cylindrical part and a sealing part, the cylindrical part being formed cylindrically along an axis, and the sealing part sealing a top end of the cylindrical part, being arranged along a plane orthogonal to the axis, and being circular in planar view,
• an annular part formed annularly about the axis and having an inner diameter that is larger than an outer diameter of the cylindrical part,
• a first coupling part coupling the cylindrical part and the annular part to each other at a first coupling position in a circumferential direction about the axis, and
• a second coupling part coupling the cylindrical part and the annular part to each other at a second coupling position in the circumferential direction, the second coupling position being different from the first coupling position,
• wherein the body, the first coupling part, and the second coupling part are integrally formed with a resin material,
• wherein a pair of first grooves extending in a first direction along the axis are formed in an outer circumferential face of the cylindrical part,
• wherein a pair of second grooves are formed in the sealing part so as to extend in a second direction orthogonal to the first direction and interpose the axis,
• wherein the pair of first grooves are connected to the pair of second grooves,
• wherein the first coupling position is a position interposed between the pair of first grooves, and
• wherein the second coupling position is another position not interposed between the pair of first grooves,
• the detaching method comprising:
• gripping an end in the second direction of the annular part and rotating the annular part about the first coupling position in a direction away from the sealing part to release a coupled state of the second coupling part;
• and
• gripping the end in the second direction of the annular part and moving the annular part so as to cause cracks to occur in the pair of first grooves and the pair of second grooves to release a state where the sealing cap seals the opening.