Six pack rings or six pack yokes are a set of connected plastic rings that are used in multi-packs of beverage, particularly six packs of beverage cans.
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History
The six pack rings in most common use today are the descendants of an original design by ITW Hi-Cone, which first introduced them in St. Louis, Missouri in the summer of 1960. Within 10 years, plastic rings had completely replaced the paper and metal based holders then common in the market. Today several other manufacturers continue to produce six pack rings. Though interest in multi-packs has continued to grow, other variations, including paperboard baskets and HDPE plastic can carriers have grown in popularity, providing an alternative to conventional six pack rings.
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Environmental concerns
Since the late 1970s, six pack rings were cited as a particularly dangerous form of marine litter as marine wildlife were found entangled in the rings, sometimes strangling to death. But since 1989, six-pack rings in the USA have been manufactured to be 100 percent photo-degradable, so the plastic will begin to disintegrate in just a few weeks, allowing animals to easily free themselves from the brittle and crumbling rings. This is in accordance with the U.S. Federal regulation for testing plastic photo-degradation, which is 40 CFR Ch. I (7-1-03 Edition) PART 238. In 2016, SaltWater Brewery developed edible rings that sea-creatures could consume safely.
Six-pack rings are now a relatively minor contributor to marine litter and wildlife fatalities. Fishing gear and other plastic wastes are a larger problem.
Source of the article : Wikipedia
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