Frangible seal type bottle cap - has screwed portion joined by weakened line to ring fitting over skirt

摘要

The bottle cap comprises a skirt section clamped round the neck, and joined onto a screwed section breaking free of the skirt section the first time it is undone. The screwed and skirt sections are separately manufactured (1, 3), and the free lower edge of the screwed section is joined via a weakened line (4) to a sealing ring (2). The I.