Insulation box detection

Fresh-keeping box testing is an important part of ensuring its quality, safety, and functionality. Here are some common fresh-keeping box testing methods:

1. Physical appearance testing
Surface inspection: Check whether the surface of the fresh-keeping box has obvious defects such as cracks, scratches, bubbles, deformation, impurities, flashes, poor plasticization, gaps, black spots, powder spots, etc. These defects may affect the sealing, durability, and appearance of the fresh-keeping box.
Dimension measurement: Measure the external dimensions (length, width, height) of the fresh-keeping box to ensure that the dimensions meet the design specifications and standard requirements. Accurate dimensions are very important for the use and storage of fresh-keeping boxes.
Logo inspection: Confirm whether the logo on the fresh-keeping box is complete, including information such as manufacturer name, product model, production date, material description, etc. Complete and accurate logos can help consumers understand the basic information of the product, facilitate correct use and maintenance, and are also an important basis for product quality traceability.
2. Sealing performance testing
Static test: Put a certain amount of water or other liquid in the fresh-keeping box, and then place it horizontally or tilted for a period of time to observe whether there is any liquid leakage. You can also use the negative pressure method, using components such as vacuum pumps, pressure sensors, data acquisition devices, and control systems, to test the sealing performance of the fresh-keeping box through negative pressure.
Dynamic test: simulate the falling situation in actual use to evaluate the impact resistance and sealing performance of the fresh-keeping box. The drop test can evaluate whether the fresh-keeping box easily breaks or leaks when it is impacted by external forces.
3. Temperature resistance test
High-temperature test: place the fresh-keeping box in a high-temperature environment (such as 80°C to 120°C) for a certain period of time (such as 30 minutes to 60 minutes) to check whether it is deformed, discolored, or other undesirable phenomena. The fresh-keeping box needs to have a certain high-temperature resistance to ensure that it will not be damaged or produce harmful substances under high-temperature conditions.
Low-temperature test: place the fresh-keeping box in a low-temperature environment (such as -20°C to -40°C) for a certain period of time (such as 24 hours to 48 hours) to check whether it is brittle or other damage. When used in a refrigerator, the fresh-keeping box needs to be able to withstand low temperatures without brittle cracks and other problems.
4. Chemical performance test
Total migration test: Detect the total amount of substances in the fresh-keeping box that may migrate to food to ensure that there is no harm to human health.
Heavy metal content test: Use chemical analysis methods (such as atomic absorption spectroscopy) to detect the heavy metal content in the fresh-keeping box, such as lead, cadmium, mercury, etc. Heavy metals are potentially toxic to the human body, and their content must comply with relevant safety standards.
Decolorization test: If a colorant is added to the fresh-keeping box, a decolorization test is required to check whether the color migrates to the contacted substance under certain conditions.
5. Washing resistance test
Simulate the daily washing process, wash the fresh-keeping box several times, and check whether its appearance, size, sealing performance, etc. are affected to evaluate its washing resistance during long-term use.

6. Pressure resistance test
Test the pressure resistance of the fresh-keeping box under a certain pressure, such as placing an object of a certain weight on the fresh-keeping box to check whether it is deformed or broken. This is very important to ensure the stability of the fresh-keeping box when storing heavy food or being squeezed.

7. Packaging Inspection
Check whether the packaging of the fresh-keeping box is firm and beautiful and whether it can protect the product from damage during transportation and storage. Poor packaging may cause damage to the fresh-keeping box during transportation, thus affecting its use effect and safety.

In summary, the testing methods of fresh-keeping boxes cover multiple aspects such as physical appearance, sealing performance, temperature resistance, chemical properties, washing resistance, pressure resistance, and packaging. These testing methods are designed to ensure that the quality, safety, and functionality of the fresh-keeping box meet relevant standards and requirements.