Abstract: The stratification of the cover film, that is, the composite fastness of the cover film is low, which will seriously affect the shelf life and edible performance of the lactic acid bacteria beverage. Therefore, the detection of the composite strength of the lactic acid bacteria beverage cover film should be strengthened. In this paper, Labthink XLW (EC) intelligent electronic tensile testing machine is used to test the peeling strength of the cover film of aluminum-plastic composite film used for lactic acid bacteria beverage, and the test process, test principle and equipment parameters are introduced. The company provides a reference for monitoring the composite fastness of composite membrane materials. Key words: cover film, composite film, delamination, composite fastness, peel strength, lactic acid bacteria beverage, intelligent electronic tensile testing machine Meaning Lactic acid bacteria beverages contain a large amount of protein and fat, and these components are easily oxidized and deteriorated. In order to ensure the taste and flavor of the product, the manufacturer often uses an aluminum-plastic composite film as a cover film to seal the container. If the composite fastness between the single-layer films of the cover film is low, that is, the peel strength when the single-layer film is peeled off is low, and the cover film and the cup body are not separated when the cover film is peeled off, but the cover is The phenomenon of separation of the adhesive layers of the single-layer membranes not only causes inconvenience to consumers, but also tends to cause delamination of the cover film, which leads to a decrease in barrier properties and physical and mechanical properties of the product package, thereby affecting the shelf life of the product. Therefore, good composite fastness is one of the basic properties that a cover film material should have. In general, we characterize the composite fastness by monitoring the peel force or peel strength of the cover film. Figure 1 Lactic acid bacteria beverage cover film packaging 2. Test sample A brand of lactic acid beverage cover film with aluminum-plastic composite film. 3. Testing standards This paper is based on the method standard GB 8808-1988 "soft composite plastic material peeling test method" for testing. 4. Test equipment In this paper, the XLW (EC) intelligent electronic tensile testing machine independently developed by Jinan Languang Electromechanical Technology Co., Ltd. is used to detect the peel strength of the cover film samples. Figure 2 XLW (EC) intelligent electronic tensile testing machine 4.1 Principle of the test The fixture of the device is divided into upper and lower two, the upper clamp can be moved according to the preset speed, and the lower clamp remains fixed. During the test, the two ends of the sample are clamped in the upper and lower clamps respectively. With the movement of the upper clamp, the sample is peeled, stretched or torn, and the force and displacement changes caused by the change of the sample. The force value sensor and the displacement sensor respectively placed on the moving chuck are respectively monitored, and according to the monitoring result, the peeling strength, the breaking force and the deformation rate of the sample are calculated. 4.2 Scope of application (1) This equipment is specialized in plastic film, composite materials, flexible packaging materials, plastic hoses, adhesives, adhesive tapes, stickers, medical patches, release papers, protective films, composite covers, metal Stripping, stretching, deformation, tearing, heat sealing, bonding, puncture force, opening force, low-speed unwinding force, peeling force, etc. of foil, separator, back sheet material, non-woven fabric, rubber, paper, etc. The test, such as the tearing force of the oral liquid cover, the puncture/pullout force, the puncture force of the infusion bag cover, the puncture/pull force of the soft rubber bottle stopper. (2) This equipment meets a number of national and international standards, such as GB 8808, GB/T 1040.1 ~ GB/T1040.4, GB/T 1040.5, GB/T 4850, GB/T 12914, YBB00132002, ISO 37, ASTM E4 , ASTM D882, JIS P8113, QB/T 2358, QB/T 1130, and the like. 4.3 Equipment parameters The test specifications of the equipment are 50 N, 500 N, and the customer can choose according to the needs of the test. The test accuracy of the device is better than 0.5, which ensures the accuracy of the test data. The device supports the pull and press bidirectional test mode. There are seven test speeds for the user to set freely in the pull and press directions, respectively 50 mm/min, 100 mm/min, 150 mm/min, 200 mm/min, 250. Mm/min, 300 mm/min, 500 mm/min. The machine integrates eight independent test procedures, such as stripping, stretching, tearing, and heat sealing, providing users with a choice of test items. This equipment adopts the pneumatic sample clamping mode to prevent the sample from slipping and ensure the accuracy of the test data. Intelligent configuration such as limit protection, overload protection and automatic return to ensure the user's operation safety. Support LystemTM laboratory data sharing system to achieve unified management of test data. 5. Test process (1) Cut 5 specimens each with a width of 15 mm and a length of 200 mm along the transverse and longitudinal directions of the sample. (2) Both ends of the width direction of each sample are manually peeled off by 50 mm in advance. (3) The two ends of the sample stripping portion are respectively clamped in the upper and lower jigs of the device, and the longitudinal axis of the sample stripping portion coincides with the center line of the upper and lower jigs. (4) Set the parameter information such as test speed and sample width, click the test option, and the test starts. (5) The equipment automatically detects the change in the force value during the test, and calculates and displays the final peel strength value of the sample based on the detected data. 6. Test results The arithmetic mean of the transverse peel strength of the samples tested herein was 3.145 N/15 mm, and the arithmetic mean of the longitudinal peel strength was 4.235 N/15 mm. 7. Conclusion The XLW (EC) intelligent electronic tensile testing machine used in this paper is a professional testing equipment for testing the peeling strength of sealing film. It has the advantages of simple test operation, high intelligence, accurate test results and high test accuracy. It can be truly reflected. The composite fastness of the cover film material helps the enterprise to solve the stratification of the cover film. In addition to the peel strength of the cover film, attention should also be paid to the overall sealing performance and barrier properties of the product package. As an excellent supplier of packaging testing equipment, Labthink is committed to providing professional, high-end packaging testing equipment and testing services to customers around the world. You can find out about the testing equipment and testing services. Jinan Languang Electromechanical Technology Co., Ltd. is willing to enhance technical exchanges and cooperation with enterprises and institutions in the industry. hair mask DELIN HAIR COSMETICS , https://www.hairdyecolorfactory.com
