Abstract: Plastic shopping bags have good flexibility and tensile strength to meet the good requirements of consumers. This article takes the plastic shopping bags used in a supermarket as an example, using XLW (PC) independently developed by Jinan Languang Electromechanical Technology Co., Ltd. The intelligent electronic tensile testing machine tests the tensile strength of the shopping bag samples to evaluate the flexibility of the sample, and through the description of the test process and equipment parameters and principles, the company detects the tensile resistance of the shopping bag products. Provide a reference for strength performance. Keywords: plastic shopping bag, film, sheet, flexibility, tensile strength, intelligent electronic tensile testing machine Meaning Plastic shopping bags are consumables in daily life, which provide convenience for consumers, and also cause serious waste of energy resources and environmental pollution due to excessive use and recycling. In particular, ultra-thin plastic shopping bags are easily damaged and are mostly discarded at will, becoming the main source of “white pollutionâ€. At present, more and more countries and regions have restricted the production, sale and use of plastic shopping bags. Therefore, in order to reduce the environmental pollution caused by plastic shopping bags, in addition to responding to the national “plastic limit order†call, the use of plastic shopping bags should be minimized, and the use of plastic bags can be reduced by increasing the number of times the plastic bags are reused. Therefore, plastic shopping bag manufacturers should strengthen the flexibility of plastic shopping bags, enhance their tensile strength and extend the service life of plastic bags. Figure 1 Common plastic shopping bags 2. Test samples This test uses a plastic shopping bag provided by a supermarket as the test object. 3. Detection basis For the tensile strength test of plastic film and sheet, the test standard can be referred to as GB/T 1040.3 "Determination of tensile properties of plastics - Part 3: Test conditions for plastics and sheets". 4, test equipment Jinan Languang Electromechanical Technology Co., Ltd. independently developed and designed the XLW (PC) intelligent electronic tensile testing machine. Figure 2 XLW (PC) intelligent electronic tensile testing machine 4.1 Test principle The sample is clamped between the two chucks of the clamp, and the two chucks are moved relative to each other. The force value sensor and the built-in displacement sensor on the movable chuck are used to collect the force value change and displacement during the test. The change is made to calculate the tensile, tearing, deformation rate and other performance indexes of the sample. 4.2 Scope of application (1) This equipment can be used for testing the tensile strength and deformation rate, tensile properties, tensile strength, puncture resistance, tear resistance, peel strength performance, heat seal strength and other properties of plastic film, sheet and other materials. It can be used for infusion bag cover, soft rubber stopper, oral liquid cap puncture/pull force test; can be used for tape unwinding force, plastic bottle anti-pressure, combination cover and jelly cup, yogurt cup cover film opening force, etc. Testing with packaging performance. (2) This equipment can meet GB/T 10004, ISO 37, GB 8808, GB/T 1040.1, GB/T 1040.2, GB/T 1040.3, GB/T 1040.4, GB/T 1040.5, GB/T 4850, GB/ T 12914, GB/T 17200, GB/T 16578.1, GB/T 7122, GB/T 2790, GB/T 2791, GB/T 2792, GB/T 17590, ASTM E4, ASTM D882, ASTM D1938, ASTM D3330, ASTM F88, ASTM F904, JIS P8113, QB/T 2358, QB/T 1130 and other related standards at home and abroad. 4.3 Equipment parameters 50 N, 500 N two-type force sensor is available. According to the relevant standards, the equipment provides seven test speeds of 50 mm/min, 100 mm/min, 150 mm/min, 200 mm/min, 250 mm/min, 300 mm/min and 500 mm/min, according to the test standard. Require free setting. The long stroke of 1000 mm can be used to test materials with large deformation rates. Intelligent configuration such as limit protection, overload protection, automatic return and power-down memory to ensure the user's operation safety. A test machine integrates seven independent test procedures, such as stretching, puncture, peeling and tearing, to provide users with a choice of various test items. Support LystemTM laboratory data sharing system to unify test results and test reports 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 plastic shopping bag sample with a cutter. (2) The two ends of the sample are respectively clamped on the upper and lower chucks of the device, and the long axis direction of the sample should coincide with the center line of the upper and lower clamps. (3) Set parameter information such as test speed and sample width. (4) Click the test start option and the test starts. The instrument automatically calculates and displays the final test results. 6. Test results The plastic shopping bag sample tested in this test has a transverse tensile breaking force of 51.135 N, a tensile strength of 62.676 MPa, an elongation at break of 55.40%, a longitudinal tensile breaking force of 49.316 N, a tensile strength of 60.437 MPa, and an elongation at break. It is 67.30%. 7. Conclusion XLW (PC) intelligent electronic tensile testing machine is a professional testing equipment for the tensile strength of plastic shopping bags. It has high test accuracy and good repeatability of test results, which can truly reflect the flexibility of plastic shopping bags. In addition to tensile strength, plastic shopping bags should also focus on their heat seal strength, dart impact and other performance indicators, and these performance related testing equipment and services can be logged in to view. The more you understand, the more you trust! 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Plastic shopping bag flexibility test program - Jinan Languang