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.

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 R 1 . 
     
     
         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 (R 1 ) 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 (R 1 ) 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 (R 2 ) 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 R 2  is from 45 to 50 mm.