Bottlecap Apr 2026

The Evolution, Engineering, and Environmental Impact of Bottle Closures

Originally, metal caps were lined with natural cork. By 1955, solid molded polyvinyl chloride (PVC) liners were introduced, and by 1965, the twist-off crown cap became a standard for glass bottles. bottlecap

Early 20th-century innovations by Amos Long and Albert Jones introduced tamper-proof mechanisms that protected public health and are now industry standards. 2. Engineering and Material Science and by 1965