Abstract: The wrapping film is compactly and fixedly bundled into a unit by means of the superior winding force and retracting property of the film, and the product is free from looseness and separation even under adverse conditions. Therefore, the stretch film should have good puncture performance and transverse tear strength to ensure that the film does not break when it encounters sharp objects at high draw ratio. In this paper, taking the wrapping film as an example, the XLW (EC) intelligent electronic tensile testing machine is used to test the puncture resistance of the wrapping film to verify whether the wrapping film can effectively resist the puncture of the corner of the cargo. At the same time, the principle and test procedure of the test are introduced. The industry provides a reference for monitoring the puncture performance of the stretch film. Key words: stretch film, stretch film, puncture resistance, puncture resistance, puncture strength, electronic tensile testing machine 1, meaning Stretch film, also known as stretch film, shrink film. The early stretch film is mostly blown film. At present, the stretch film is mainly produced by the casting method. This is because the stretch film produced by the casting line has the advantages of uniform thickness and high transparency, and can be applied to the requirement of high-rate pre-stretching. Since the single-layer casting can not achieve single-sided adhesion, the application field is limited, so its application is not as wide as that of the three-layer casting process, and the high-quality wrapping film should have high transparency, high longitudinal elongation, and high yield point. The characteristics of high transverse tear strength and good puncture performance. Puncture resistance is a guiding indicator for assessing the ability of a package to resist the penetration of sharp hard objects. In the long-term contact with the packaging, if the product contains a sharp and hard material, it is easy to produce a strong puncture effect on the wound film. If the puncture resistance of the stretched film is poor, it is easy to be damaged by the puncture of the sharp object, causing the product or the cargo to be loosely separated and unable to play a protective role. This is also the reason why the wrapping film package should have high puncture resistance. Figure 1 Stretch film 2, the implementation of standards The domestic test method for the puncture resistance of packaging is mainly based on the relevant puncture performance test part of GB/T 21302-2007 "General Rules for Composite Film Bags for Packaging". 3, test samples Stretch film provided by a company. 4, test equipment Jinan Languang Electromechanical Technology Co., Ltd. independently developed and designed the XLW (EC) intelligent electronic tensile testing machine. Figure 2 XLW (EC) intelligent electronic tensile testing machine 4.1 Test principle The sample is fixed on the fixture, and the puncture needle attached to the movable chuck punctures the sample, and the force value sensor and the displacement sensor located on the movable chuck are used to test and record the change of the force value during the puncture. 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 Puncture, tensile, peeling, deformation, tearing, heat sealing, bonding, 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 puncture force of the infusion bag cover, the tearing force of the oral liquid cover, the puncture/pull force, the puncture/pull force of the soft rubber bottle stopper. (2) This equipment meets many national and international standards, such as GB/T 21302, 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, ISO 37, ASTM E4, ASTM D882, ASTM D1938, ASTM D3330, ASTM F88, ASTM F904, 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 device integrates eight independent test procedures, such as puncture, stretching, peeling, 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, the test process (1) Cut 5 pieces of the sample with a diameter of 100 mm from the wound film sample using a sampler. (2) Fix the sample to the special jig for the puncture test and fix the clamp on the test equipment. (3) Set test parameters such as test speed and sample thickness. (4) Click the Start Test option and the test begins. The device automatically calculates and displays the final test results. 6, test results The average puncture resistance of the wound film samples tested in this paper was 1.46 N. 7. Conclusion XLW (EC) intelligent electronic tensile testing machine is a professional instrument for testing the puncture resistance, tensile strength, peel strength and heat sealing strength of plastic flexible packaging. It can truly reflect the puncture resistance of the sample and its operation is simple. High test accuracy. Labthink has been committed to providing professional inspection services and testing equipment to customers around the world. Over the years, it has provided thousands of packaging anti-puncture monitoring solutions to customers around the world, providing reliable data support. For more information on packaging barriers, mechanical properties, etc., you can check out the information. Labthink is looking forward to enhancing technical exchanges and cooperation with enterprises and institutions in the industry.
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Verification scheme for anti-puncture performance of wrapping film