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A hermetic seal is any type of sealing that makes a given object airtight (preventing the passage of air, oxygen, or other gases). The term originally applied to airtight glass containers but, as technology advanced, it applied to a larger category of materials, including metals , rubber , and plastics .
A vacuum bell jar is placed on a base which is vented to a hose fitting, that can be connected via a hose to a vacuum pump. A vacuum is formed by pumping the air out of the bell jar. The lower edge of a vacuum bell jar forms a flange of heavy glass, ground smooth on the bottom for better contact. The base of the jar is equally heavy and flattened.
Materials for use in vacuum are materials that show very low rates of outgassing in vacuum and, where applicable, are tolerant to bake-out temperatures. The requirements grow increasingly stringent with the desired degree of vacuum to be achieved in the vacuum chamber. The materials can produce gas by several mechanisms.
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Double-chamber sealers are typically used for medium-volume packaging, and also have the capability to vacuum seal liquids. The lid generally swings from one side to another, increasing production speed over a single-chamber model. Double-chamber vacuum packaging machines generally have either spring-weighted lids or fully automatic lids.
Prior to 1933, Ball was the largest domestic manufacturer of home canning jars. In 1939 it manufactured 54% of all the canning jars made in the US. A drop in demand for the jars during the 1930s led the Ball brothers to begin manufacturing other types of jars and bottles for commercial use, and eventually expanding into other lines of business.
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