Abstract: Aseptic brick packaging has the advantages of high barrier property, good sealing, etc. It can meet the long shelf life requirements of food contents, but the barrier properties and physical and mechanical strength (such as impact resistance, puncture resistance, etc.) of aseptic bricks Affected by the composite fastness between the layers of the film, if the composite fastness is poor, it can easily cause the laminating of the composite film, leading to the loss of the overall barrier property of the composite film and a serious decrease of the physical and mechanical strength, and the quality and safety of the finished product packaging are apt to occur. Monitor the peel strength between layers to ensure composite fastness. In this paper, the XLW (EC) intelligent electronic tensile testing machine independently developed by Jinan Languang Electromechanical Technology Co., Ltd. was used to test the peel strength of the pure milk aseptic brick coil film, and the technical information such as the detection method and instrument test steps were introduced in detail. Keywords: sterile brick, paper aluminum-plastic composite film, composite film, plastic composite film, soft plastic composite film, liquid milk, dairy products, peel strength, peel force, composite fastness, layering, intelligent electronic tensile testing machine 1 , the meaning Liquid milk mainly includes fresh cow (yoghurt) milk, yoghurt, brewing milk and other products. These products contain a lot of fats and proteins and are easily oxidized and degraded. Therefore, packing materials with a certain barrier property are used to package liquid milk to ensure that liquid milk is not Oxygen and other harmful substances in the external environment affect the occurrence of mildew, bulging and other deterioration. The packaging of liquid milk is mainly bagged, boxed and bottled, in which the bags are mainly milky white film, black and white film and aseptic pillow, and black and white barrier films can guarantee the liquid milk to reach the shelf life of 30 to 45 days. Satisfy 45 to 90 days of shelf life. The boxed liquid milk is mainly in the form of aseptic bricks. At present, Tetra Bile and Combine bricks are mainly used. Aseptic brick is based on food grade paperboard as a substrate, and it is made of paper, aluminum foil and plastic composite film made of polyethylene, paper, aluminum foil and other materials. After the liquid milk is sterilized at a high temperature, the aseptic bricks are filled and sealed under sterile conditions (ie sterile bricks, liquid milk, and packaging aids are all sterile) in a sterile production environment. Therefore, the use of a high-barrier composite membrane material under aseptic conditions for aseptic bricks can meet the high barrier properties to outside air. At the same time, the seals of the aseptic bricks are tightly sealed and are not prone to seal leakage. It is an excellent material for all aspects that can meet the long shelf life requirements of liquid milk, and its shelf life can reach 6 to 12 months. The composite fastness between layers of sterile bricks is an important factor affecting the overall barrier properties and physical mechanical strength of aseptic bricks. If the composite fastness between the layers is low and delamination occurs easily, the oxygen permeability of the aseptic brick composite film package material increases, and the barrier property decreases; in addition, the impact resistance of the original composite film is easily caused after layering. Or the puncture-resistance change becomes the impact resistance and puncture resistance of each single-layer film, resulting in the reduction of the physical and mechanical properties of the aseptic brick finishing. Therefore, the composite fastness is an important control index of aseptic brick packaging materials, generally characterized by peel strength. In this paper, combined with the peel strength test standard and relevant testing equipment, the detection principle and test procedure of the composite fastness of aseptic bricks are introduced in detail, providing technical reference for the dairy product industry. Figure 1 sterile brick film 2 , test standards At present, the domestic standards for the peel strength of composite films for packaging are mainly GB 8808-88 “Test methods for peeling of soft composite plastic materialsâ€. 3 , test sample A brand of paper-aluminum-plastic composite aseptic brick film samples used in certain brands of pure milk. 4 , test equipment This article uses Labthink blue light XLW (EC) intelligent electronic tensile testing machine to test the peel strength of the sample. Figure 2 XLW (EC) Intelligent Electronic Tensile Testing Machine 4.1 Test principle Predetermined width of the sample is manually peeled off the film layer to be separated, and the two ends of the peeled-off sample are respectively clamped on two clamps. The two clamps move relative to each other, perform T -type peeling, and pass the force on the movable clamp. The value sensor measures the average peel force between the composite layers. 4.2 Scope of application (1) XLW (EC) intelligent electronic tensile testing machine is suitable for plastic film, composite materials, soft packaging materials, plastic hoses, adhesives, adhesive tapes, stickers, medical patches, release paper, protective film, Bonding, stretching, deformation, tearing, heat-sealing, bonding, puncture force, opening force, tearing force, low-speed solution of combination cover, metal foil, separator, backing material, non-woven fabric, rubber, paper and other products Rolling force, peeling force, pull-out force and other performance tests. (2) XLW (EC) Intelligent Electronic Tensile Testing Machine complies with GB 8808 , GB/T 1040.1 ~ GB/T 1040.4 , GB/T 1040.5 , GB/T 4850 , GB/T 12914 , GB/T 2790 ~ GB/T 2792 There are nearly 30 domestic and international standards such as QB/T 2358 , ISO 37 , ASTM D 3330 , and ASTM F 904 . 4.3 Equipment Parameters 5 , the test process (1) Using a sampler to cut 5 specimens each of 15 mm in width and 200 mm in length along the longitudinal and transverse directions of the aseptic brick film sample . (2) Manually pre-strip 50 mm at one end of the specimen along the length . (3) The two ends of the stripped part of the sample are clamped by the upper and lower clamps of the device, respectively, so that the long axis direction of the sample coincides with the center line of the two clamps. Figure 3 Mounting specimens after peeling a distance (4) Set test parameters such as test speed and sample width. (5) Click the test start option, the test begins, the equipment automatically tests the force value during the sample stripping process, and reports the final test results. 6 , test results The peel strength of the pure milk aseptic tile composite film was 3.220 N (vertical) and 3.011 N (horizontal), respectively. 7. Conclusion XLW (EC) intelligent electronic tensile testing machine has the advantages of easy operation and high data accuracy in testing the peel strength of plastic composite film, sterile brick and other soft plastic composite packaging, and can truly reflect the composite fastness of composite film materials. Oxygen need to know about dairy packaging materials testing equipment and technology related to information transmission rate, heat seal strength, sealing, solvent residues and other critical test items, you can visit the blue light on our website or call us. The more you understand, the more trust! 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