1. Tensile strength test
Testing vacuum bags uses standardized equipment to measure the maximum force that the bag can withstand when stretched. This helps determine the durability of the bag and ensures that it will not break when packaging heavy objects or during transportation. The test results can also provide manufacturers with a basis for improving material formulations or thickness.
2. Puncture strength test
This test simulates the situation where sharp objects pierce the bag. Use specific tools and standard methods to evaluate the bag's resistance to puncture, ensuring that the vacuum bag is not easily punctured when packaging foods with sharp edges such as fish and meat, thereby avoiding leakage.
3. Sealing test
Test the sealing performance of the vacuum bag at the seal to ensure that air cannot enter during the vacuum packaging process. This is usually performed by vacuum pumps and pressure tests. Qualified sealing performance effectively prevents food oxidation and corruption and prolongs the shelf life.
4. Oxygen permeability test
The test evaluates the vacuum bag's barrier ability to oxygen to avoid quality degradation caused by food oxidation. By measuring the oxygen permeability per unit area, it is determined what type of food packaging the bag is suitable for, ensuring that it meets the needs of different products.
5. Water vapor transmission rate test
By measuring the amount of water vapor that can penetrate the bag material, it is ensured that the vacuum bag can effectively prevent moisture from entering or losing moisture, which is especially important for maintaining the freshness of food.
6. Low temperature resistance test
Tested in a low temperature environment, the vacuum bag will not become brittle or lose its sealing performance under freezing conditions. The test usually includes observing the physical properties of the bag after being stored at -18℃ or lower for a certain period of time.
7. Heat seal strength test
Test the strength of the heat-sealed part of the bag, and no breakage will occur during the heat sealing process. This test usually involves applying tension to the heat-sealed vacuum bag to ensure that its seal remains intact under high or low temperature conditions.
8. Chemical stability test
Measure the safety of the material when it comes into contact with food to ensure that no harmful substances are released. The test may include simulating the chemical environment of different foods, detecting the stability of the material and the amount of migrating substances.
9. Appearance inspection
Ensure the appearance quality of the vacuum bag is good, and check for bubbles, wrinkles, cracks or other defects. This not only affects the appearance of the package, but may also affect the performance.
10. Wear resistance test
Evaluate the performance of vacuum bags under friction and wear conditions to ensure that they will not be damaged during transportation and use.
11. Heat resistance test
Test the performance of bags in high temperature environments to ensure that they will not melt or release harmful substances during heating, and are suitable for food heated in microwaves or soaked in hot water.
Through the above comprehensive quality tests, the various performances of vacuum bags can be effectively guaranteed to ensure their reliability and safety in practical applications. These tests not only meet industry standards, but also meet consumers' requirements for food safety and preservation.
