How to determine the sealing and safety of aluminum foil steaming bags?

The sealing and safety of aluminum foil steaming bags can be judged from the following aspects:

Sealing assessment

Flatness and appearance inspection:

Observe whether the surface of the aluminum foil steaming bag is flat, and whether there are obvious warping, deformation, or damage.

By conducting an "air to ground" drop test, observe the condition of the aluminum foil bag after landing. If it bends, tilts outward, or arches inward, it may indicate poor sealing.

Sealing strength test:

Use a professional sealing strength tester to evaluate the firmness of the seal.

The sealing performance can be judged by observing the gas leakage inside the bag through vacuum pumping, or by observing the shape recovery of the bag after releasing the vacuum.

Professional testing standards:

Refer to relevant standards such as GB/T 22638.7-2016 Test Methods for Aluminum Foil Part 7: Determination of Heat Seal Strength for testing.

Security assessment

Material safety:

Confirm whether the aluminum foil steaming bag is made of food grade materials such as PE, PP, and other harmless materials.

Avoid using bags containing harmful substances such as plasticizers and heavy metals.

Chemical safety testing:

Conduct chemical resistance testing to assess the material's resistance to chemicals and ensure safe use in specific environments.

Spectral analysis techniques such as Fourier transform infrared spectroscopy (FTIR) can be used to quickly identify the chemical composition of materials.

Microbial barrier testing:

Evaluate the ability of aluminum foil steaming bags to prevent microbial infiltration and ensure that food is not contaminated during the packaging process.

High temperature steaming test:

Evaluate the performance changes of aluminum foil cooking bags under high temperature conditions through high-temperature cooking tests, ensuring that they can still maintain good sealing and safety at high temperatures.

Compliance check:

Confirm whether the aluminum foil steaming bag complies with relevant food safety standards such as GB 4806.7-2016 "National Food Safety Standard for Plastic Materials and Products in Contact with Food".

In summary, judging the sealing and safety of aluminum foil cooking bags requires comprehensive consideration from multiple aspects, including flatness and appearance inspection, sealing strength testing, material safety, chemical safety testing, microbial barrier testing, high temperature cooking resistance testing, and compliance inspection. Through these measures, the safety and reliability of aluminum foil steaming bags in food packaging can be ensured.