Refrigerated vacuum bags are widely used, such as walnuts, beef, lamb, soup, dumplings, etc. We're everywhere in the supermarket. In life, a growing number of frozen foods choose to be packed in vacuum bags, mainly for the purpose of quality protection. In particular, the detection of resistance (gases through quantity tests and water vapour through quantity tests) is directly related to the shelf life。
Vacuum bag containment test
Insistence is an important indicator of the permeability of a packaging material, which is considered an important indicator of the permeability of the packaging material and an essential function that the packaging material must have, especially since the food requires a higher level of resistance to packaging material, which requires high resistance properties to prevent the penetration of substances such as oxygen, water vapour, microbes, acid alkali corrosive solvents, as well as anti-fouling and damp features, maintaining internal environmental stability in the packaging and protecting contents, thereby extending the shelf and shelf life of the food。
Test principles
Gases are tested through volume: using pressure differential test principles, pre-processed samples are placed between upper and lower test cavities. The low pressure cavity (lower cavity) is first treated in a vacuum and then the entire system is vacuumed; when the specified vacuum is reached, the test lower cavity is closed and the high pressure cavity (upper cavity) is filled with a pressure test gas, and a constant pressure differential (removable) is guaranteed to be formed on both sides of the sample; thus, the gas is permeable from the high pressure side to the low pressure side, with the effect of the pressure differential gradient, by monitoring the pressure inner pressure of the low pressure to arrive at the barrier parameters of the sample。
Water vapour is tested through volume: using the method of weighting in wet cups, at a given temperature, a specific humidity differential is formed on both sides of the sample, water vapour enters the dry side through the sample in the wet cups, and the water vapour pass rate of the sample is obtained by measuring the weight of the wet cup over time。
The barrier tester recommends:
Gases are tested through volume: the gpt-203 pressure difference gas permeator is based on the principles of the pressure differential method. It is a gas passivity test instrument specialized in thin membrane specimens, which applies to plastic thin membranes, membranes, high barrier materials, tablets, metal clots, gas through volume and gas through coefficients。
Water vapour is tested through volume: the wpt-304 water vapour rate tester is based on a cup-style test principle. It is a water vapour rate tester specialized in thin membrane specimens and applies to the determination of water vapour passivity for plastic thin membranes, membranes, tablets and health, construction materials, etc. Technical indicators for the control and regulation of materials are met through the measurement of water vapour rates to meet different needs for product applications。
The chinan sing instrument has been dedicated to providing high-value holistic solutions for most national customers, with the core purpose of the company being to continue to innovate, build sophisticated testing instruments, meet the needs of different customers in the industry, and look forward to increased communication and cooperation with business enterprises in the industry。
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