William Painter patented a cheap, single-use metallic cap, crimped over a lip formed on the bottle nek and lined with a thin cork wafer that both formed a leakproof seal and separated drink and metal. Soon thereafter, he patented a machine that filled the bottle simultaneously with syrup and carbonated water then applied the cap.
The shelf-life of soft drinks is determined by the CO2 level, which decreases due to permeation through the packaging material. Therefore, most of the responsibility in the shelf-life extension of such products has to be attributed to the bottle material performances, such as the ability to maintain the internal CO2 through the shelf-life, that is, in other words, its barrier property to CO2.
William Painter had already filed US Patent 468226 in 1892 for the 'crown closure'. Painter's crown was lined with cork and characteristically had corrugations in the 'skirt'. His idea was to create a stopper that consumers would throw away, thus insuring future demand and a continuing business.
Crown corks are designed to secure seal in capping applications with glass and aluminum bottles in the brewing and beverage market.
Crown cork are items made from tinned metal used to fit on top of beverage bottles. The main function is to seal and lock the contents of the bottle from being easily opened and for preventing any item from escaping out or from entering into the bottle.
The crown cork is made from tinned metals with the interior part in contact with the contents of the bottle being covered off by a plastic disc.
Crown corks manufactured to date consist of two parts: a steel body made by press forming a disk punched out of thin sheet steel, giving the disk its cylindrical shape with the surface of the sides characteristically formed into regular teeth, and a plastic sealing disc fixed to the internal surface of cylinder bottom.
For many years virtually all carbonated soft drinks were packaged in glass bottles sealed with crown cork. This closure has short skirt with 21 flutes which are crimped onto locking position on the bottle head. The flutes are angled at 15° in order or maintain an efficient seal.
Crown cork
