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See Table 1 - Nomenclature of a glass container from data sheet DT23.01 - GLASS CONTAINER NOMENCLATURE. 

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Vacuum chamber
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A "vacuum chamber" is a specialized enclosure used to conduct tests on the sealing system of glass packaging or other types of packaging. In the context of glass packaging, a vacuum chamber is used to simulate conditions of reduced pressure (vacuum) to evaluate the integrity and effectiveness of the sealing system.

Here's how a vacuum chamber is used to test the sealing system of glass packaging:

  1. Setup: The glass packaging, such as bottles or jars with their sealing components (caps, lids, seals), is placed inside the vacuum chamber.

  2. Sealing: The packaging is closed according to its normal sealing procedure.

  3. Vacuum Test: The vacuum chamber is then sealed and the air inside the chamber is gradually removed, creating a controlled vacuum environment. This simulates conditions where the external pressure is lower than the internal pressure of the packaging.

  4. Observation: During the vacuum test, any defects or weaknesses in the sealing system become evident. If there are leaks or inadequate seals, the reduced pressure inside the chamber can cause air or gases to escape from the packaging. This could be visually observed or measured using appropriate instruments.

  5. Results: The test results indicate whether the sealing system of the glass packaging is effective at maintaining an airtight or hermetic seal under vacuum conditions. If there are any failures, adjustments can be made to improve the sealing process or the design of the packaging components.

Vacuum chamber tests are valuable quality control measures, especially for products that need to maintain their integrity and freshness over time, such as food, pharmaceuticals, or sensitive materials. By subjecting the packaging to vacuum conditions, manufacturers can identify potential weaknesses and ensure that their products will perform well under various environmental conditions, including during transportation and storage.

In addition to the vacuum chamber, other methods such as dye penetration or pressure differential tests might also be used to evaluate the sealing integrity of glass packaging systems.


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