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　　Gas chromatography analysis, mass spectrometry, infrared spectroscopy, and other technical means can generally be used to determine the barrier performance of packaging against specific factors.

　　Packaging size

　　The geometric size of packaging also has an impact on shelf life. The larger the size, the smaller the ratio of packaging area to volume. The amount of component penetration through the package increases with the Square number of the size, while the volume of the product absorbing the penetration increases with the cubic number of the size. Under the same other conditions, the requirement for the barrier layer decreases as the packaging size increases.

　　environment condition

　　To determine the expiration date of a product's packaging, it is first necessary to clarify the main issues in product circulation: ① what sensitive product the product belongs to; ② The environmental conditions during the circulation process that a product is scheduled to go through.

　　Drug manufacturers must ensure that the packaged drugs remain intact and effective under the most adverse environmental conditions. Food, on the other hand, often requires packaging to be considered in slightly better than the most adverse environmental conditions, while also considering the economics of packaging.

　　The expiration date of packaging plays an important role in establishing the circulation system of the product.

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