Test method for heat sealing performance of plastic bag bottom

Abstract: plastic bags are mainly used to hold goods The important performance of Zui is the heat sealing effect of the bag bottom In order to prevent the leakage of the material caused by the crack of the seal in the use process, and avoid the waste caused by the non reuse of the plastic bag, it is necessary to strengthen the monitoring of the heat sealing performance of the bottom of the plastic bag In this paper, the XLW intelligent electronic tensile testing machine developed by Jinan Languang mechanical and Electrical Technology Co., Ltd is used to test the heat sealing strength of the plastic bag samples, so as to evaluate the sealing performance of the samples Through the description of the test process, equipment parameters, principles and other information, it provides a reference for enterprises to test the bottom bearing strength of the plastic bag products Key words: plastic bag, film, heat sealing performance, heat sealing strength, bottom bearing strength, intelligent electronic tensile testing machine 1 Meaning plastic bag is an essential portable in people's daily life, often used to hold other items It is widely used for its advantages of low cost, light weight, large capacity and convenient storage However, it is forbidden to be used and produced by some countries because of its long degradation period and difficult treatment In order to reduce the environmental pollution caused by plastic bags, the reuse rate of plastic bags should be increased so as to reduce the production of plastic bags The firmness of the plastic bag body is the key to ensure the reuse, especially the sealing performance of the bottom of the plastic bag Therefore, the manufacturers of plastic bags should strengthen the detection of the heat sealing strength of the bottom of plastic bags, evaluate the sealing performance of the bottom of the bags in time, and extend the service life of plastic bags If the heat sealing strength at the bottom of the plastic bag is low, it is easy to crack and leak at the sealing place, which can not be reused; if the heat sealing strength at the bottom of the plastic bag is high, it is easy to shrink at the heat sealing place, which may even cause undercutting at the heat sealing place of the package, which may cause the package to leak at the heat sealing root, or even break the package In conclusion, manufacturers should attach great importance to the detection of the heat sealing strength of plastic bags Fig 1 common plastic bags 2 Test samples a vest type plastic bag sample provided by an enterprise 3 The test is based on the domestic test standard for heat sealing strength of plastic film packaging bags, mainly referring to QB / T 2358 test method for heat sealing strength of plastic film packaging bags 4 The XLW intelligent electronic tensile testing machine independently developed and designed by Jinan Languang Electromechanical Technology Co., Ltd Figure 2 XLW intelligent electronic tensile tester 4.1 test principle The sample is clamped between the two collets of the fixture, and the two collets do relative movement Through the force value sensor on the dynamic collet and the displacement sensor built in the machine, the change of force value and displacement in the test process are collected, so as to calculate the heat sealing strength, tensile strength, tear, deformation rate and other performance indexes of the sample 4.2 scope of application (1) the equipment can be used for testing the heat sealing strength, puncture resistance, tensile strength, breaking force, tensile strength and deformation rate, tear resistance, peel strength and other indexes of plastic film, composite film, thin film and other materials; it can be used for the 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 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 force value sensors with equipment parameters of 100N, 200N and 500N 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 600 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 heat sealing, stretching, peeling, tearing, etc., providing users with a variety of test options Support Lystem TM laboratory data sharing system, manage test results and test reports in a unified way 5 Test process (1) cut 10 test strips with width of 150 mm and development length of 100 mm from the bottom of plastic bag with sample cutter (2) Clamp the two ends of the sample strip on two clamps respectively, and the long axis direction of the sample strip shall coincide with the center line of the two clamps （3） Set test speed, sample width and other parameter information (4) Click the start test option to start the test The instrument automatically records the force value during the test and calculates the test results 6 Test results in this paper, the heat sealing strength of the plastic bag sample is 7.619 n / 15mm, 7.882 n / 15mm, 8.257 n / 15mm, 8.323 n / 15mm and 8.554n/15mm respectively 7 Conclusion XLW intelligent electronic tensile testing machine is a professional testing equipment for tensile strength of plastic shopping bags, which has high testing accuracy, good repeatability of test results, and can truly reflect the heat sealing strength of the bottom of plastic bags Labthink Languang has been committed to providing professional testing services and equipment for customers around the world Over the years, it has provided thousands of heat sealing strength testing services for customers around the world, providing customers with reliable technical solutions Labthink is looking forward to enhancing technical exchanges and cooperation with users in various industries