| 摘要 |
Bottle neck structure and relative cap made of plastic material, particularly for water and beverages, comprising a neck (1) screw (4) with concave arc-shaped helical element and volutes mutually adjacent to define narrow crests (5) and female screw (15) of the cap (2) with spiral of the arc-shaped convex thread accurately convexly complementary to the concavity (4) of the helical element of the neck. |
