| 摘要 |
<p>A barrel ring for use in rolling closures comprising at least two ring sections. One of the ring sections defines a part-circular outer surface. Another of the ring sections defines a part-spiral outer surface. The ring section are joined together end-to-end to form a barrel ring with the part-spiral surface, at one end, merging smoothly into the part-circular surface. A method for producing the barrel ring is also disclosed.</p> |
