Reduced weight, threaded neck for plastic bottle used to contain still drinks such as water has threaded portion, intermediate portion and lower portion with same thickness that is 0.75-0.9 times thickness of upper portion

摘要

The bottle neck includes: a tubular element (2) having a threaded portion (20) of height H2 and a thickness E2 that presents an external wall (21) having threads (22); an intermediate portion (30) of height H3 and thickness E3; a flange (40) of height H4; a lower portion (50) of height H5 and thickness E5; and a skirt (60) of height H6. The thicknesses (E2,E3,E5) of the threaded portion, intermediate portion and lower portion respectively are roughly equal, and are roughly 0.75-0.9 times the thickness (E1) of the upper portion (10). The height (H6) of the base of the skirt is between 0.9-1.3 times the thickness (E1) of the upper portion.