A METAL SCREW CAP FOR BEVERAGE BOTTLE

Abstract

A metal screw cap for a beverage bottle consisting of a dome and a cylinder having internal thread adapted to co-operate with a threaded neck of the bottle and a liner affixed to the inner surface of the screw cap, where the dome is concave and is connected with the cylinder through a top ring, where between the dome and the top ring there is a circumferential groove having the radius of the inner curvature.

Claims

1. A metal screw cap for a beverage bottle comprising a dome and a cylinder having internal thread adapted to co-operate with a threaded neck of the bottle and a liner affixed to the inner surface of the screw cap, characterized in that the dome (1) is concave and is connected with the cylinder (3) through a top ring (2), wherein between the dome (1) and the top ring (2) there is a circumferential groove having the radius of the inner curvature R1.

2. The screw cap according to claim 1, characterized in that the cylinder (3) is connected with a security band (5) by frangible bridges (6).

3. The screw cap according to claim 1, characterized in that, the depth of the screw cap (D) is from 1 to 10 mm, preferably from 1.2 to 8 mm.

4. The screw cap according to claim 1, characterized in that the radius (R1) is from 0.5 to 4 mm, when the screw cap is not twisted.

5. The screw cap according to claim 4, characterized in that the radius (R1) is from 1 to 3 mm.

6. The screw cap according to claim 1, characterized in that the diameter of the cylinder (S) is from 10 to 100 mm.

7. The screw cap according to claim 1, characterized in that, the radius (R2) of the curvature of the dome (1) of the screw cap is from 35 to 105 mm.

8. The screw cap according to claim 7, characterized in that the radius R2 is from 45 to 50 mm.

Description

EXAMPLE

[0016] The dome 1 is concave and is connected with the cylinder 3 having the height H through the top ring 2. Between the dome 1 and the top ring 2 is placed the circumferential groove having the radius of the inner curvature R1. The cylinder 3 is equipped with a tread 4. The cylinder 3 is connected with a security band 5 by the frangible bridges 6. The depth of the screw cap D is from 1 to 10 mm, preferably from 1.2 to 8 mm. The radius R1 is from 0.5 to 4 mm, when the screw cap is not twisted. Preferably the radius R1 is from 1 to 3 mm. The diameter of the cylinder S is from 10 to 100 mm. The radius R2 of the curvature of the dome 1 of the screw cap is from 35 to 105 mm. Preferably the radius R2 is from 45 to 50 mm.

[0017] Inside of the screw cap is lined with a liner 7.

[0018] The screw cap 8 is applied on the threaded neck 9 of the bottle 10. Twisting of the screw cap causes sealing of the outlet of the bottle, because the radius R1 is reduced, owing to that the wall of the screw cap is being pushed to the wall of the bottle.