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The cap screwed down onto a rubber ring on the shoulder of the jar, not the lip. [10] Between 1860 and 1900, many other patents were issued for Mason jar improvements and closures. [11] In 1903 Alexander Kerr introduced lids with a permanent rubber seal. His improved design in 1915 used the modern design. [12]
Mason's innovation was a square-shouldered jar with threaded screw-top, matching lid, and rubber ring for an airtight seal. Mason's easy-to-use, re-usable jars made home canning popular among American settlers, homesteaders, and even in urban homes. Most Mason jars were manufactured by competitors after his patent expired in 1879.
In 1858, Mason created jars that were made of transparent glass with a screw-on top. Inside the flat metal lids, he placed a rubber ring, which was crucial to making the container airtight.
Because the four main components of their core product line of canning jars included glass, zinc, rubber, and paper, the Ball company acquired a zinc strip rolling mill to produce metal lids for their glass jars, manufactured rubber sealing rings for the jars, and acquired a paper mill to fabricate the packaging used in shipping their products.
The Fowler's Vacola system uses glass jars, single use rubber ring seals and pressed metal lids, much like American Mason jars first patented in 1858, except that the jars and lids are not threaded. During the canning process, while still hot (and presumably sterile ), the lids are secured by metal tension clips which are removed once cooled ...
Plastic rings will (hopefully) soon be eliminated. This hack might soon be an unnecessary relic of the past. Fortunately, many brands are making efforts to reduce or eliminate single-use items ...
Preserved food in Mason jars. Home canning or bottling, also known colloquially as putting up or processing, is the process of preserving foods, in particular, fruits, vegetables, and meats, by packing them into glass jars and then heating the jars to create a vacuum seal and kill the organisms that would create spoilage.
Many closures need to have the ability to adjust to slight manufacturing variation in the container and the closure structure. Some closures are made of flexible material such as cork, rubber, or plastic foam. Often an o-ring or a closure liner (gasket made of pulp or foam cap liner) is used. Linerless closures often use a deformable plastic ...
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