How to test and verify the barrier performance of duck neck aluminum plastic composite film packaging

Abstract: duck neck is a kind of common flavor snack, which is delicious and popular among consumers In the circulation process of duck neck packaging, there are often quality problems such as bag expansion and air leakage, which bring unpleasant consumption experience to consumers Similar quality problems of duck neck are often caused by poor barrier of packaging materials In this paper, ox2 / 230 oxygen transmittance test system and fdt-02 kneading tester independently developed by Jinan Languang mechanical and Electrical Technology Co., Ltd are used to verify the barrier property of duck neck aluminum plastic composite packaging bag, and the principle, parameters and operation process of the equipment are explained, which has certain reference and guidance significance for controlling the barrier property of aluminum plastic composite film Key words: duck neck, meat products, oxygen permeability, oxygen resistance, aluminum-plastic composite film, aluminum coated composite film, kneading, pinhole 1, meaning duck neck is a high protein, low-fat food, which has the effects of nourishing qi and tonifying deficiency, beauty, fresh fragrance, and is a kind of leisure food suitable for all ages The rich nutrients of duck neck also put forward strict requirements for the barrier of packaging materials If the oxygen resistance of packaging materials is low and the oxygen transmission rate is high, the amount of oxygen contacted by the package duck neck is large, which is prone to mildew, bulging, peculiar smell and other quality problems At present, most of the common duck necks are packed with aluminum-plastic composite film For this kind of packing materials containing aluminum foil, the existence of aluminum foil material has the characteristics of not resistant to rubbing, that is, under the effect of external force, defects such as creases and pinholes are easy to appear, resulting in the reduction of barrier Therefore, for the oxygen resistance of aluminum-plastic composite film and aluminum coated plastic composite film materials, not only We should pay attention to the oxygen permeability before and after rubbing Fig 1 duck neck aluminum plastic composite packaging bag 2 Relevant test standards at present, the domestic test standards for oxygen permeability of soft plastic packaging are GB / T 1038-2000 test methods for gas permeability of plastic film and sheet pressure difference method, GB / T 19789-2005 test for oxygen permeability of plastic film and sheet of packaging materials Coulometer test method, etc., but there is no relevant test standard for kneading test in China, and American Standard ASTM F 392 is used in China 3 Test sample a brand of duck neck aluminum-plastic composite film packaging bag 4 In this paper, Labthink blue light ox2 / 230 oxygen transmittance test system and Labthink blue light fdt-02 kneading tester were used to test the oxygen transmittance and kneading of the aluminum-plastic composite membrane Figure 2 ox2 / 230 oxygen transmittance test system figure 3 fdt-02 kneading tester 4.1 test principle ox2 / 230 The oxygen transmittance test system uses the isobaric test principle to clamp the pre-treated sample between the test chambers Oxygen or air flows on one side of the film, and high-purity nitrogen flows on the other side of the film Oxygen molecules diffuse through the film to the other side of the high-purity nitrogen, which is carried to the sensor by the flowing nitrogen Through the analysis of the oxygen concentration measured by the sensor, parameters such as oxygen transmittance can be calculated For packaging containers, high-purity nitrogen flows in the container, and air or high-purity oxygen surrounds the outside of the container Fdt-02 kneading tester can simulate the kneading and bending damage of packaging materials in the process of production, processing, transportation, etc., knead the samples horizontally and vertically, and judge the resistance of materials to kneading by detecting the change of barrier or pinhole number before and after kneading 4.2 scope of application (1) ox2 / 230 oxygen permeability test system film: it is applicable to the oxygen permeability test of various plastic cover film, plastic composite film, paper plastic composite film, coextrusion film, aluminum coating film, aluminum foil, aluminum plastic composite film and other film materials Sheet type: it is suitable for oxygen permeability test of sheet materials such as engineering plastics, rubber, building materials, etc., such as PP sheet, PVC sheet, PVDC sheet, etc Containers: it is applicable to the oxygen permeability test of bottles, bags, cans, boxes and barrels made of plastic, rubber, paper, paper plastic composite, glass, metal and other materials, such as Coke bottles, peanut oil barrels, Tetra Pak packaging, vacuum packaging bags, metal three cans, plastic cosmetics packaging, tooth paste hoses, jelly cups, yogurt cups, etc Standard: it can meet iso15105-2, GB / t19789, ASTM d3985, ASTM f2622, ASTM f1307, ASTM f1927, JIS k7126-2, ybb00082003 and other national and international standards (2) Fdt-02 kneading tester film type: it is suitable for testing the kneading resistance of plastic film, sheet and composite film, such as various composite film, aluminum-coated film, aluminum-plastic composite film, nylon film and coating film for packaging Paper type: it is suitable for the test of the kneading resistance of paper materials Standard: ASTM f392 4.3 equipment parameters (1) test range of ox2 / 230 oxygen transmittance test system: 0.01-6500 cm 3 / (M 2 · d) for thin film samples and 0.0001-60 cm3 / (PKG · d) for container samples Number of samples: three identical or different samples can be tested at the same time Test temperature: 15 ~ 55 ℃ Test humidity: 0% RH, 35% RH ~ 90% RH Test gas: O2, air, etc (2) Fdt-02 kneading tester kneading frequency: 45 times / min Rubbing angle: 440 ° or 400 ° Horizontal stroke: 155mm or 80mm Number of samples: four identical or different samples can be tested at the same time in one test Kneading mode: five kneading modes are available 5 Test process 5.1 oxygen transmittance test process before kneading (1) sample preparation use a sampler to cut 3 samples from the surface of the pretreated sample (2) Apply a layer of vacuum grease around the test chamber, paste the sample on the test chamber and clamp it with the sample clamping device As shown in Figure 4 Fig 4 sample clamping process (3) set test parameters for sample test, turn on vacuum pump and start the test After the test, the system automatically calculates the test results according to the measurement data 5.2 kneading test process (1) sample preparation use a sampler to cut two samples of 280 mm × 200 mm from the sample surface (2) The sample clamp is used to fix the sample on the rotating shaft As shown in Figure 5 Figure 5 sample fixation (3) sample test select appropriate kneading mode, start the test, and stop the test after completing the kneading times corresponding to the selected mode 5.3 during the test process of oxygen permeability after rubbing, prepare the sample from the surface of the sample after rubbing according to the steps in 5.1 to test the oxygen permeability after rubbing 6 The results showed that the oxygen permeability of the duck neck package before rubbing with aluminum-plastic composite membrane was 0.1364cm 3 / (M 2 · d), 0.1402cm3 / (M2 · d), 0.1391cm3 / (M2 · d), respectively After 270 rubbing in 6 minutes in C mode, the oxygen permeability of the sample after rubbing was 10.1846cm3 / (M2 · d), 10.7351cm3 / (M2 · d), 10.9430cm3 / (M2 · d) 7 Conclusion using Labthink ox2 / 230 oxygen transmittance test system and fdt-02 kneading tester can accurately test the oxygen transmittance before and after kneading of aluminum-plastic composite membrane, truly reflect the barrier performance of the packaging material, the operation of the instrument is simple, the test data is repeatable, and the test efficiency is high After rubbing, the oxygen permeability of the aluminum-plastic composite film packaging material increases obviously, and the barrier property decreases greatly, which shows that for the aluminum-plastic composite film, the importance of testing the oxygen permeability before and after rubbing to monitor the barrier performance of the package material In addition to the barrier tested in this paper, the duck neck aluminum-plastic composite film packaging bag also needs to pay attention to the test indicators such as heat sealing strength, puncture resistance and sealing performance For the test instruments of these performance indicators, you can visit Languang or call for consultation The more you understand, the more you trust! 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