Abstract : Soft plastic packaging stored in cold environment needs high cold resistance, that is, compared with the standard environmental conditions, the physical mechanical strength such as impact resistance of the packaging material does not have obvious deterioration. If the soft plastic packaging has poor cold resistance, it will easily lead to the rupture of the finished product packaging in the low-temperature environment. Therefore, for the soft plastic packaging used in the low-temperature environment, the cold resistance is an extremely important physical and mechanical performance index. This article uses the FIT-01 film impact tester to test the anti-pendulum impact energy, and further describes how to verify the cold resistance of soft plastic packaging for users in related industries to ensure that soft plastic packaging is not easy to break in cold environments. Keywords : cold resistance, anti-pendulum impact energy, low temperature environment, cold environment, cracking, soft plastic packaging, plastic bags, FIT-01 film impact tester 1 , the meaning Some items such as foods or medicines need to be stored in a low-temperature environment in order to ensure that they are not easily degraded or thawed. Sometimes the ambient temperature is required to reach minus 18 degrees Celsius, and this temperature threatens the quality of the contents, but endangers the external packaging materials. Performance may cause problems such as broken packaging and leakage. For example, the frozen dumplings did not appear to burst at the production line, but they broke after being frozen and stored. The occurrence of the above quality problems is mostly related to the poor cold resistance of the packaging material, that is, the flexibility and impact resistance of the packaging material are deteriorated at a low temperature, resulting in failure to tolerate external impact. Soft plastic packaging in the cold low temperature environment physical and mechanical strength will be deteriorating, particularly vulnerable to brittle and broken, which is related to the internal chemical structure of polymer materials at low temperature changes. In order to improve the soft plastic packaging material is not easy to embrittlement at low temperature, you need to add additives such as toughening agents into its raw materials, but what is the cold resistance, whether it can withstand low temperature environment, should be verified by cold resistance test. Cold resistance is determined by comparing the impact resistance measured under standard ambient conditions with a temperature below minus 18 °C . For example, the cold resistance is not less than a fixed percentage ratio (for example, the cold resistance of a BOPA/LDPE composite film needs to be not less than 60% ) indicates that the physical and mechanical strength of the packaging material at a low temperature has not significantly deteriorated. This article uses the FIT-01 film impact tester independently developed by Jinan Languang Electromechanical Technology Co., Ltd. to test the cold resistance of quick-freezing dumpling bags, providing technical references for related industries. Figure 1 Frozen Food 2 , the status quo Most of the products that need to be stored under low temperature environment are made of soft plastic packaging, while the cold resistance of soft plastic packaging is mainly monitored by testing the anti-pendulum impact energy of packaging materials. At present, most of the soft plastic packaging materials used in low-temperature environments in China are BOPA/LDPE , especially in the frozen food industry. The domestic cold resistance test methods for these materials mainly refer to QB/T Biaxially-oriented nylon ( BOPA ). / Low Density Polyethylene ( LDPE ) Composite Membrane, Bags", and the test method for the impact resistance of the anti-oscillating weight to be tested in cold resistance is referred to GB 8809 "Plastic Film Anti-Pendulum Impact Test Method". 3 , sample A brand of dumplings packaging plastic bags. 4 , testing equipment In this paper, Labthink blue light FIT-01 film impact tester was used to test the anti-pendulum impact energy under the standard environmental conditions and minus 18 °C environment. The cold resistance data of the samples were obtained through comparative calculation. Figure 2 FIT-01 film impact tester 4.1 Test principle The hemispherical punch of the thin film impact tester impacts at a certain speed and penetrates the film sample to measure the energy consumed by the punch to evaluate the anti-pendulum impact ability of the film. 4.2 Scope of application (1) This equipment is professionally applied to the accurate determination of impact resistance of materials such as plastic films, sheets, composite films, and metal foils. It can also be used to test the pendulum impact resistance of paper and paperboard, such as aluminized paper , Lele packaging aluminum plastic composite materials. (2) The equipment meets a number of national and international standards: GB 8809-88 , ASTM D3420 , NF T54-116 . 4.3 Equipment Parameters 5 , the test process (1) in the direction of width of the film sample is taken uniformly cut 100 mm × 100 100 mm or a diameter of 10 mm, placing the sample at a temperature of 23 ± 2 ℃, at least 4 h at 45% ~ 55% RH environment, and Test in this environment. (2) Test the thickness of the center of each sample, take the arithmetic average of the test results of the 10 samples, and record the sample thickness. (3) Select the size of the punch according to the impact resistance required by the sample, so that the reading is between 10% and 90% of the full scale of the instrument . (4) Calibrate the instrument according to the rules of use of the instrument. (5) Place the specimen flatly in the gripper to ensure that there is no wrinkling or excessive tension around the specimen . Ensure that the impact surfaces of the 10 specimens are consistent. (6) Turn the pointer to the maximum scale, press the handle, quickly release the pendulum, make the pendulum impact the sample, record the reading displayed by the instrument. (7) and from the film width direction of the uniform clipping 100 mm × 100 mm sample of 100 mm in diameter or 10, placing the sample at a temperature of - 18 ℃ for 2 h at ambient, repeating steps (2) to (6 ) Continue to experiment. (8) The anti-pendulum impact energy of the film measured after being placed at -18 °C is divided by the impact energy of the film against the pendulum measured under standard environmental conditions, ie cold resistance, in % . Figure 3 sample test process 6 , test results - The anti-pendulum impact energy of the film measured after being placed in an environment of 18 °C is 1.400 J. The shock resistance of the film measured under standard environmental conditions is 1.490 J , and the cold resistance is 94 % . 7. Conclusion Cold resistance is one of the important properties of soft plastic packaging used in low temperature environment. Soft plastic packaging with good cold resistance can effectively ensure that the finished product packaging is not easy to break under cold environment. In this paper , the cold resistance of quick-freezing dumplings was tested using the FIT-01 film impact tester. The test results are stable and the data is reliable, which can truly reflect the physical and mechanical strength of packaging materials at low temperatures. In addition to testing equipment for testing the physical and mechanical strength of soft plastic packaging, Labthink also provides global customers with professional testing services and equipments such as barrier properties and sanitary chemical properties for soft plastic packaging. Learn more about Labthink 's testing equipment With services, you can visit the website of Jinan Languang Company to view the specific information of the equipment or call us . Jinan Languang Electromechanical Technology Co., Ltd. is willing to take this opportunity to increase technical exchanges and cooperation with enterprises and institutions in the industry.
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