How to evaluate the flexibility of plastic shopping bags?

Abstract: plastic shopping bags with good flexibility and tensile strength can meet the requirements of consumers In this paper, taking the plastic shopping bags used in a supermarket as an example, XLW (PC) intelligent electronic tensile testing machine independently developed by Jinan Languang Electromechanical Technology Co., Ltd is used The tensile strength of shopping bag samples is tested to evaluate the flexibility of the samples, and through the description of the test process, equipment parameters, principles and other information, it provides a reference for enterprises to test the tensile strength of shopping bag products Key words: plastic shopping bag, film, sheet, flexibility, tensile strength, intelligent electronic tensile testing machine 1 Meaning plastic shopping bag is a consumable in daily life, which provides convenience for consumers At the same time, due to excessive use and inadequate recycling, it also causes serious energy resource waste and environmental pollution In particular, ultra-thin plastic shopping bags are easy to be damaged, most of them are discarded at will, and become the main source of "white pollution" 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 call of the national "plastic restriction order" and minimizing the use of plastic shopping bags, we can also reduce the use of plastic bags by increasing the number of reuse of plastic bags 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 The test sample is the plastic shopping bags provided by a supermarket 3 Test basis the reference test standard for tensile strength test of plastic film and sheet is GB / T 1040.3 determination of tensile properties of plastics Part 3: test conditions of plastics and sheet 4 Test equipment: XLW (PC) intelligent electronic tensile testing machine independently developed and designed by Jinan Languang Electromechanical Technology Co., Ltd Fig 2 4.1 test principle of XLW (PC) intelligent electronic tensile testing machine clip the sample between two collets of the fixture, the two collets do relative motion, through the force value sensor on the dynamic collet and the displacement sensor built in the machine, collect the force value change and displacement change in the test process, so as 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 to test the tensile strength and deformation rate, tensile performance, breaking force, puncture resistance, tear resistance, peel strength, heat sealing strength and other indexes of plastic film, sheet and other materials; it can be used for puncture of infusion bag cover, soft rubber bottle plug and oral liquid cover/ It can be used to test the unwinding force of adhesive tape, the pressure resistance of plastic bottle, the opening force of combined cover, jelly cup, yoghurt cup cover film and other products and packaging performance (2) The equipment can meet the requirements of 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 relevant standards at home and abroad 4.3 the force value sensors of 50 N and 500 N are available for selection 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, which can be set freely according to the requirements of the test standards The ultra long stroke of 1000 mm can meet the test of materials with large deformation rate Intelligent configuration of limit protection, overload protection, automatic return and power failure memory can ensure the operation safety of users A testing machine integrates seven independent testing procedures, such as stretching, puncture, peeling and tearing, which provides users with a variety of test options Support Lystem TM laboratory data sharing system, and manage test results and test reports in a unified way 5 Test process (1) use a sample cutter to cut 5 samples with a width of 15 mm and a length of 200 mm along the horizontal and vertical directions of plastic shopping bag samples (2) The two ends of the sample shall be clamped on the upper and lower chucks of the equipment respectively, and the long axis direction of the sample shall coincide with the central line of the upper and lower clamps （3） Set test speed, sample width and other parameter information (4) Click the test start option to start the test The instrument automatically calculates and displays the final test results of Zui 6 Test results: the transverse tensile strength, tensile strength and elongation at break of the plastic shopping bag samples are 51.135 n, 62.676 MPa and 55.40% respectively; the longitudinal tensile strength, 60.437 MPa and 67.30% respectively 7 Conclusion XLW (PC) intelligent electronic tensile testing machine is a professional testing equipment for the tensile strength of plastic shopping bags, which has high testing accuracy, good repeatability of test results, and can truly reflect the flexibility of plastic shopping bags In addition to tensile strength, plastic shopping bags should also focus on their heat sealing strength, dart impact and other performance indicators For testing equipment and services related to these properties, you can call Jinan Languang The more you understand, the more you trust! 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