Manual Ring Pull Cap Sealing Machine | Pull-off bottle cap sealing machine

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ALKA, the predecessor of the modern ring-pull caps, was introduced during the 1930s. ALKA had a seal made of natural cork. It became popular in Nordic countries and Mediterranean countries as an easy-to-open cap. ALKA was made of aluminium and had a tab or twin tabs that were pulled to remove the cap. There was no scoring on an ALKA cap. Production of the ALKA cap took place on the bottling line.

In 1974 AB Wicanders Korkfabriker of Sweden patented the MaxiCap [2]. The MaxiCap was produced from 1979 at Wicanders’ factory in Hämeenlinna Finland, now known has Finn-Korkki Oy [3]. A MaxiCap is an aluminium closure with scoring and a tab to pull. They were easier to use than the ALKA and pre-manufactured outside of the bottling plant. This allowed for increased production speeds on the bottling line. Soon after the MaxiCap came the RingCrown closure. Invented in the early 1980s it was originally called MaxiCrown and later became known as RingCrown. The RingCrown is easier to use than its predecessors because it has an attached ring rather than a static pull off tab.