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A vessel cap is comprised of a body mounted at a vessel inlet through which a liquid material stored in a vessel is discharged outwardly and having a certain space therein. A pressing plate is disposed in the body to be movable in upper and lower directions. A cutter is formed at an edge of a lower

A vessel cap is comprised of a body mounted at a vessel inlet through which a liquid material stored in a vessel is discharged outwardly and having a certain space therein. A pressing plate is disposed in the body to be movable in upper and lower directions. A cutter is formed at an edge of a lower surface of the pressing plate in a circumferential direction for penetrating a sealing member when the pressing plate is pressed and which cuts the sealing member when the body is rotated. A hooking member downwardly protrudes at the lower surface of the pressing plate for storing the sealing member cut by the cutter in the body. A connection portion is formed between an outer circumferential surface of the pressing plate and an inner circumferential surface of the body for guiding the pressing plate to be moved in upper and lower directions.

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1. A vessel cap, comprising: a closed body mounted at a vessel inlet through which a liquid material stored in a vessel is discharged outwardly;an outer cylindrical sidewall surrounding a sealing member, the outer cylindrical sidewall having a mounting portion detachably fixed to a rim of the vessel

1. A vessel cap, comprising: a closed body mounted at a vessel inlet through which a liquid material stored in a vessel is discharged outwardly;an outer cylindrical sidewall surrounding a sealing member, the outer cylindrical sidewall having a mounting portion detachably fixed to a rim of the vessel and seated upon a peripheral edge of the sealing member;a pressing plate extending radially inward from the outer cylindrical sidewall and substantially overlaying the sealing member, the pressing plate and outer cylindrical sidewall cooperating to enclose the sealing member and the vessel inlet;one or more cutters protruding from a lower surface of the pressing plate, the cutters penetrating the sealing member when the pressing plate is pressed and cutting the sealing member when the body is rotated after the pressing plate is pressed;an elastic connection portion formed between an outer circumferential surface of the pressing plate and an inner circumferential surface of the outer cylindrical sidewall, the elastic connection portion allowing the pressing plate to be moved in upper and lower directions; and,a supporting rod downwardly extending from a center of a lower surface of the pressing plate, the supporting rod penetrating the sealing member when the pressing plate is pressed, the supporting rod comprising: an outer circumferential surface;a sharp distal end;a pair of flexible resilient hooking protrusions disposed above the distal free end for retaining the sealing member after the sealing member is cut by the cutters, each hooking protrusion of the pair of hooking protrusions extending from an integral pivoting connection with the outer circumferential surface to an outermost free end, the pair of hooking protrusions having: a pre-stressed configuration prior to penetration of the sealing member wherein the elongate body extends outward in a substantially radial direction and is spaced above the sealing member;a stressed configuration upon penetration of the sealing member wherein the sealing member forcibly bends the elongate body in a substantially axial direction;a post-stressed configuration after penetration of the sealing member wherein the elongate body is below the sealing member and the sealing member is seated upon the elongate body, and the elongate body extends outward in a substantially radial direction. 2. The vessel cap of claim 1, wherein each of the pair of hooking protrusions has a triangular shape and a sharp upper end for hooking the sealing member. 3. The vessel cap of claim 1, wherein each of the hooking protrusions has a conical shape. 4. The vessel cap of claim 1, wherein the pressing plate is formed as a disc shape having a diameter smaller than an inner diameter of the outer cylindrical sidewall, and the pressing plate is disposed at a lower side than an upper surface of the body. 5. The vessel cap of claim 1, wherein the pair of hooking protrusions are define an angle of 180° with the outer circumferential surface of the supporting rod. 6. The vessel cap of claim 1, wherein a plurality of concave-convex protrusions are formed at an outer circumferential surface of the outer cylindrical sidewall. 7. The vessel cap of claim 6, wherein the mounting portion further comprises: two protrusions protruding from an inner circumferential surface of a lower end of the outer cylindrical sidewall body with a predetermined gap as a belt shape; anda hooking groove formed between the two protrusions for hooking a hooking jaw formed at an outer circumferential surface of the vessel inlet. 8. The vessel cap of claim 1, further comprising a safety member for preventing the pressing plate from being unexpectedly pressed. 9. The vessel cap of claim 8, wherein the safety member is connected to an upper inner portion of the outer cylindrical sidewall, and is connected to the pressing plate; and the safety member is broken when the pressing plate is pressed in order to penetrate and cut the sealing member. 10. The vessel cap of claim 1, wherein the cutters comprise: a supporting portion formed at an edge of the pressing plate;a first cutting portion sharply formed at a lower end of the supporting portion for penetrating the sealing member when the pressing plate is pressed; anda second cutting portion formed on at least one side surface of the supporting portion for circumferentially cutting the sealing member when the body is rotated. 11. The vessel cap of claim 10, wherein the supporting portion has a trapezoidal sectional surface, and protrusions sharply protruding from the sectional surface define the second cutting portion. 12. The vessel cap of claim 10, wherein the supporting portion is more inclined towards a center of the body as the supporting portion is closer to a lower end of the supporting portion so as not to come in contact with the vessel inlet. 13. The vessel cap of claim 10, wherein the first cutting portion is inclined towards an inner surface of the supporting portion from an outer surface of the supporting portion. 14. The vessel cap of claim 10, wherein the cutters define a radius of curvature similar to a radius of curvature of an inner circumferential surface of the vessel inlet. 15. The vessel cap of claim 10, wherein the cutters have a triangular sectional surface.