**Aseptic Brick Packaging and Its Importance in the Dairy Industry**
Aseptic brick packaging is widely used in the dairy industry due to its high barrier properties and excellent sealing performance, which help maintain the long shelf life of liquid milk products. However, the effectiveness of this packaging depends significantly on the composite fastness between the layers of the film. Poor adhesion between these layers can lead to delamination, resulting in a loss of barrier properties and a significant decrease in mechanical strength, such as impact resistance and puncture resistance. This could compromise the quality and safety of the packaged product. Therefore, it is essential to monitor the peel strength between layers to ensure strong composite fastness.
This paper introduces the XLW (EC) intelligent electronic tensile testing machine, developed independently by Jinan Languang Electromechanical Technology Co., Ltd., which is used to measure the peel strength of aseptic brick films for pure milk. The testing method and procedure are explained in detail, providing valuable technical support for the dairy industry.
**Key Words:** Aseptic brick, paper-aluminum-plastic composite film, composite film, plastic composite film, soft plastic composite film, liquid milk, dairy product, peel strength, peeling force, composite fastness, layering, intelligent electronic tensile testing machine
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**1. Significance of Aseptic Packaging in Liquid Milk**
Liquid milk includes various types such as fresh cow's or sheep's milk, yogurt, and brewed milk. These products contain high levels of fat and protein, making them prone to oxidation and spoilage. To protect their quality, they are typically packaged using materials with good barrier properties that prevent external contaminants like oxygen from entering. Common packaging formats include bags, boxes, and bottles. Among these, aseptic bricks are the most popular, especially for long shelf-life products.
Aseptic bricks are made from paper-based aluminum-plastic composite films, consisting of layers of polyethylene, paper, and aluminum foil. Under sterile conditions, the milk is sterilized and filled into the aseptic bricks, ensuring a long shelf life of up to 6 to 12 months. The composite fastness between layers plays a critical role in maintaining the integrity of the packaging. If the layers separate, the barrier properties may weaken, and the mechanical strength could be compromised, leading to potential leakage or damage.
Thus, peel strength testing is an important part of quality control in aseptic packaging. This paper discusses the testing process using the XLW (EC) tensile testing machine, which provides accurate and reliable results.
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**2. Test Standard**
The main domestic standard for measuring the peel strength of composite films is **GB 8808-88**, which outlines the test method for peeling of soft composite plastic materials.
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**3. Test Sample**
The sample used in this study is a paper-aluminum-plastic composite aseptic brick film from a well-known brand of pure milk.
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**4. Testing Equipment**
The **XLW (EC)** intelligent electronic tensile testing machine was used to measure the peel strength of the samples.
**4.1 Test Principle**
The test involves manually peeling a section of the film, then clamping both ends of the peeled sample in the testing machine. As the two clamps move apart, the force required to separate the layers is measured using a sensor. This provides an accurate measurement of the peel strength between the composite layers.
**4.2 Application Scope**
The XLW (EC) machine is suitable for testing a wide range of materials, including:
- Plastic films
- Composite materials
- Flexible packaging
- Adhesives, tapes, stickers
- Medical patches, release papers, protective films
- Metal foils, separators, non-woven fabrics, rubber, paper, etc.
It complies with over 30 national and international standards, such as **GB 8808**, **GB/T 1040**, **ISO 37**, **ASTM D 3330**, and **ASTM F 904**.
**4.3 Device Parameters**
- Available in 500 N and 50 N models, with high accuracy (0.5%).
- Supports bidirectional testing (pull and press modes).
- Test speeds: 50 mm/min, 100 mm/min, 150 mm/min, 200 mm/min, 250 mm/min, 300 mm/min, 500 mm/min.
- Equipped with pneumatic clamps to prevent slippage.
- Stroke length: 950 mm.
- Safety features: limit protection, overload protection, and automatic return.
- Offers 100 different sample fixtures to accommodate various testing needs.
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**5. Experimental Procedure**
1. Cut samples from the aseptic brick roll film, with dimensions of 15 mm in width and 200 mm in length. Prepare 5 samples.
2. Manually peel back 50 mm of one end of each sample.
3. Clamp the stripped ends of the sample in the upper and lower jigs of the testing machine, aligning the sample’s long axis with the center line of the clamps.
4. Set the test parameters, such as speed and sample width.
5. Start the test, and the machine will automatically record the force during the peeling process and generate the final result.
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**6. Test Results**
The peel strength of the pure milk aseptic brick composite film was measured as:
- **Vertical direction**: 3.202 N
- **Horizontal direction**: 3.011 N
These values indicate the strength of the composite layers and confirm the good adhesion between them.
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**7. Conclusion**
The XLW (EC) intelligent electronic tensile testing machine offers a simple and accurate way to evaluate the peel strength of soft plastic composite packaging, such as aseptic bricks. It effectively reflects the composite fastness of the material, ensuring the reliability of the packaging.
For more information about testing equipment and technical details related to oxygen transmission, heat seal strength, sealing, and solvent residue in dairy packaging, visit [Labthink Languang](https://www.labthink.com) or call **0531-85068566** for consultation. The more you know, the more you trust!
Labthink Languang looks forward to strengthening technical exchanges and cooperation with enterprises and institutions in the industry.
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