Single-sheet plastic bottle cap

Abstract

The invention relates to a monolithic plastic bottle cap. A barb-shaped external seal with a circular arc-shaped end is arranged on the side wall of the bottle cap; when in service, an external sealing ring is matched with the external wall of a bottle mouth, and the diameter of the external sealing ring is smaller than that of the bottle mouth; the external seal is arranged at the outer ring of an inner top surface ring-shaped top seal; a ring-shaped inner plug is arranged on the inner top surface of the bottle cap and positioned at the inner ring of the ring-shaped top seal; and the outer surface of the ring-shaped inner plug is circular arc-shaped, and the maximum diameter of the circular arc is larger than the diameter of the bottle mouth matched therewith. When in service, the ring-shaped top seal is matched with the top surface of the bottle mouth. The inventive sealing structure is composed of three portions: the first portion is the ring-shaped inner plug; the second portion is the end part of the ring-shaped top seal, which is a surface just matched with the surface of the top of the bottle mouth; and the third portion is the external seal. The barb-shaped structure only generates axial acting force when the bottle cap is matched with the bottle mouth, and the bottle mouth can obtain the same force in any contact positions.

Description

technical field [0001] The invention belongs to a bottle cap, in particular to the improvement of the structure of the bottle cap. Background technique [0002] Existing a kind of bottle cap, its structure is that the inside of the top of the bottle cap is provided with an annular inner plug and a triangular section ring. Since the outer seal of this structure is a triangular ring, after the bottle mouth contacts, its contact resistance will increase sharply, resulting in excessive fluctuations in the opening torque, which may cause the opening torque to be too large to open the bottle cap. The triangular outer seal protrudes from the top, and the top wall is thin, which will produce plastic deformation under long-term pressure, which will reduce the sealing ability of the bottle cap. Contents of the invention [0003] The present invention overcomes the above-mentioned shortcomings of the bottle cap structure, and provides an outer seal protruding from the side wall, whi...

AI Technical Summary

Problems solved by technology

Since the outer seal of this structure is a triangular ring, after the bottle mouth contacts, its contact resistance will increase sharply, resulting in excessive fluctuations in the opening torque, which may cause the opening torque to be too large to open the bottle cap.

The triangular outer seal protrudes from the top, and the top wall is thin, which will produce plastic deformation under long-term pressure, which will reduce the sealing ability of the bottle cap

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