1,
Pig’s trotters are commonly packaged under vacuum conditions. The bones inside can exert puncture forces on the packaging, and if the material lacks flexibility, it may lead to pinholes or ruptures, compromising the product's quality. Aluminum-plastic composite films often include aluminum foil, which is relatively brittle. During production, processing, or transportation, pinholes and creases may occur, negatively affecting the barrier and mechanical properties of the package. To ensure the product remains fresh during its shelf life, meat processors should conduct thorough testing of the barrier properties of the packaging materials before and after packaging.
Figure 1: Pig’s trotters aluminum-plastic composite film packaging
2,
In China, common methods for testing oxygen permeability in flexible packaging include the differential pressure method and the coulomb method (also known as the equal pressure method). Standards such as GB/T 1038 and GB/T 19789 are widely referenced. However, there is no specific standard for flexibility testing. Therefore, this study refers to ASTM F392 to simulate the flexural durability of aluminum-plastic composite films during handling, processing, and transportation. The performance of the material is evaluated by measuring changes in barrier properties before and after the test.3,
Test Sample: An aluminum-plastic composite film provided by a milk powder factory was used for the experiment.4,
Test Equipment: FDT-02æ‰æ“ tester and VAC-V2 differential pressure gas permeation instrument, both developed by Jinan Languang Electromechanical Technology Co., Ltd.
Figure 2: FDT-02æ‰æ“ Tester
Figure 3: VAC-V2 Differential Pressure Gas Permeation Instrument
4.1 Test Principle
The VAC-V2 uses the differential pressure method. A pre-treated sample is placed between two chambers. The lower chamber is first evacuated, then the upper chamber is filled with a gas at a certain pressure. This creates a pressure gradient across the sample, allowing gas to permeate through it. The system continuously monitors the pressure in the lower chamber to calculate various barrier parameters.4.2 Scope of Application
(1) Suitable for testing gas permeability in plastic films, sheets, paper, cardboard, and composite materials, including cosmetic tubes and rubber sheets. (2) Applicable for gases like oxygen, carbon dioxide, nitrogen, and more, including flammable and explosive gases. (3) Complies with international standards such as ISO 15105-1, ISO 2556, GB/T 1038, ASTM D1434, and others.4.3 Equipment Parameters
- Test range: 0.05 ~ 50,000 cm³/m²·24h·0.1MPa - Number of samples: 3 pieces - Temperature range: 5°C ~ 95°C (±0.1°C) - Humidity range: 0% RH to 100% RH (±1% RH) - Supports Lystem™ laboratory data sharing system4.4 Sample Preparation Process
- Cut a Φ 97 mm sample using a sampling tool. - Cut three 280mm x 200mm samples and fix them on the FDT-02 tester with 10-12mm wide double-sided tape. - Select the rubbing mode for testing. - Repeat the process for subsequent samples.5. Test Procedure
(1) Use the VAC-V2 to measure the oxygen transmission rate before and after the test. (2) Set sample name, thickness, temperature, and humidity. (3) Start the vacuum pump. (4) Click “Start Test†to begin the process and view results automatically.6. Test Results
The average oxygen transmission rate of the tested sample was 2.9447 cm³/m²·24h·0.1MPa. After the test, the rate increased to 15.9022 cm³/m²·24h·0.1MPa.7. Conclusions
The increase in oxygen transmission rate indicates that the aluminum-plastic composite film may have developed creases or tiny pinholes during handling. This highlights the importance of testing to ensure product quality and shelf life. The VAC-V2 differential pressure gas permeation instrument offers high accuracy and repeatability, making it ideal for evaluating the barrier properties of flexible packaging materials when used with the FDT-02 tester.Labthink
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