In the modern packaging industry, non-destructive seal testers are used to test the sealing performance of product packaging. This testing is essential to ensure that the product in the package retains its freshness, safety, and quality. Understanding how it measures the difference in gas pressure between the inside and outside of the package helps us recognize the importance of this type of testing to maintain product integrity.
The NDT tester is based on a simple yet powerful principle: the quality of a seal is judged by measuring the pressure difference between the inside and outside of the package. In an intact sealed environment, the internal and external gas pressures should be different. If this pressure difference is not as expected, then it is most likely due to improper sealing or defective packaging materials.
In a closed package, the gas emitted by the product (e.g. from the spoilage process of food) or the gas that remains during the packaging can cause a difference in the internal air pressure from the external environment. The leak tester is able to accurately detect this pressure difference to assess whether the package is intact or not. If there is a constant difference in pressure, it may mean that the seal is not tight, and air and microorganisms can enter, affecting the quality of the product.
Non-destructive seal testers typically use a non-invasive method such as vacuum attenuation or ultrasonic technology. In the case of the vacuum decay method, for example, the testing process involves placing the package between two chambers with a certain differential pressure and then monitoring the pressure change. If the package is well sealed, the pressure inside will resist the change in the pressure outside; Conversely, if there is a problem with the seal, the internal and external pressure will quickly equalize.
The instrument is widely used in the quality control of food, medicine, cosmetics and other products that require strict sealing. These industries have strict requirements for the shelf life and safety of products, so testing the tightness of packages is critical.
Non-destructive seal testing not only ensures the quality of products and the health and safety of consumers, but also saves a lot of costs for enterprises. Traditional destructive testing methods can damage samples and lead to unnecessary waste. Non-destructive testing technology saves time and resources by enabling fast and effective testing without damaging the packaging.
The non-destructive seal tester is an indispensable tool in modern packaging quality control by measuring the difference between the gas pressure inside and outside the package to determine the seal quality. It provides an efficient, accurate, and non-invasive means of inspection, ensuring the overall safety and quality of the product from the production line to the consumer.