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  2. Vacuum packing - Wikipedia

    en.wikipedia.org/wiki/Vacuum_packing

    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.

  3. Hermetic seal - Wikipedia

    en.wikipedia.org/wiki/Hermetic_seal

    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 .

  4. Hypermart USA - Wikipedia

    en.wikipedia.org/wiki/Hypermart_USA

    As the Supercenter proved to be a much more profitable experiment, Walmart renamed the stores "Wal-Mart's Hypermart USA" in April 1990, and eventually began either converting them to Supercenter operations or closing them. As of 2023, two of the former Hypermart USA locations still operate as Walmarts while the other two have been demolished.

  5. 25 Best and Worst Deals at Walmart - AOL

    www.aol.com/25-best-worst-deals-walmart...

    To help you maximize savings, GOBankingRates asked a variety of experts to list items you should snatch up at Walmart — and items you should steer clear of. 25 Best and Worst Deals at Walmart ...

  6. Bell jar - Wikipedia

    en.wikipedia.org/wiki/Bell_jar

    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.

  7. Materials for use in vacuum - Wikipedia

    en.wikipedia.org/wiki/Materials_for_use_in_vacuum

    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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