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    Home > Active Ingredient News > Drugs Articles > A comparative analysis of the heat sealing strength and the heat viscosity strength of soft plastic packaging materials

    A comparative analysis of the heat sealing strength and the heat viscosity strength of soft plastic packaging materials

    • Last Update: 2018-03-28
    • Source: Internet
    • Author: User
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    Abstract: the heat sealing strength and the heat viscosity strength are two indexes to evaluate the sealing effect of the heat sealing part of the soft plastic packaging In this paper, PE single-layer film is used as the test sample, and i-thermotek 2400 heat sealing and heat viscosity tester is used to test the heat sealing strength and the heat viscosity strength of the sample, and the test results are compared and analyzed The results show that under the same heat sealing parameters, the thermal viscosity strength of the samples is significantly lower than that of the heat sealing, and the test values of the two samples show a trend of first increasing and then decreasing with the increase of the heat sealing temperature Key words: heat sealing strength, heat viscosity strength, soft plastic packaging, heat sealing parameters, sealing effect Soft plastic packaging materials are one of the main forces in the packaging field Most of the packaging products are sealed by heat sealing process Therefore, how the sealing effect of the heat sealing part directly affects the overall sealing performance of the packaging The test indexes that reflect the sealing strength of the heat sealing part of the soft plastic packaging materials are mainly the heat sealing strength and the heat viscosity strength The former refers to the combination fastness between the two parts of the heat sealing layer after the heat sealing cooling, and the latter tests the bonding fastness between the heat sealing layers before the heat sealing part cooling The test and Research on the heat sealing strength are earlier in China, and the relevant test standards issued earlier, such as the obsolete zby28004-1986 test method for the heat sealing strength of plastic film packaging bags and the current QB / T 2358-1998 test method for the heat sealing strength of plastic film packaging bags, while the research and test on the heat sealing strength are relatively late, and the current test standards are mainly YY / t1433-2016 test method for thermal sealing strength (thermal viscosity strength) of software packaging materials for medical devices In this paper, through the test of heat sealing strength and heat viscosity strength, the similarities and differences of the test methods and test results of these two kinds of indexes are analyzed 1 Test equipment and sample i-thermotek2400 thermal sealing and thermal viscosity tester: developed and manufactured by Jinan Languang Electromechanical Technology Co., Ltd., it is suitable for testing the thermal sealing and thermal viscosity of various plastic film, paper plastic composite film, aluminum coating film, aluminum foil composite film and other film-like materials The control range of heat sealing performance and thermal viscosity is room temperature ~ 250 ℃, temperature control resolution is ± 0.1 ℃, temperature control accuracy of heat sealing performance is ± 2 ℃, temperature control accuracy of thermal viscosity is ± 1 ℃; the control range of heat sealing pressure is 0.05 MPa ~ 0.7 MPa; the setting range of heat sealing time is ≤ 99.9 s; the load range of strength test is 0 ~ 50 N, accuracy is 1 The test speed of heat seal strength test is 200 mm / min, 250 mm / min and 300 mm / min; the upper and lower heat seal heads can control the temperature independently; two test start modes of manual and pedal as well as anti scald design ensure the convenience and safety of users PE film: commercially available, 40 μ m thick 2 Test process 2.1 heat sealing strength test (1) randomly cut 8 samples with length of 30 cm and width of 6 cm along the longitudinal direction of the material (2) Set the heat sealing time for 1s, the heat sealing pressure of 290kpa and the heat sealing temperature of 100 ℃ on the control software of the equipment, take out two pieces of samples and stack them, and heat seal them according to the direction parallel to the width of the sample and the heat sealing knife Raise the heat sealing temperature to 110 ℃, 115 ℃ and 120 ℃, and heat seal the remaining samples at the corresponding heat sealing temperature in two directions according to the above method Along the longitudinal direction of the specimen, cut each specimen after heat sealing into 3 specimens with a width of 15 mm (3) Take one sample and clamp it in two clamps of the equipment, set the test speed to 300 mm / min, start the test, after the test, clamp other sample strips on the equipment respectively, and test the heat sealing strength in turn 2.2 thermal viscosity strength test (1) randomly cut 12 samples with width of 15 mm and length of 35 cm along the longitudinal direction of the material (2) Set the delay time as 100ms, clamp speed as 1200cm / min, heat sealing time as 1s, heat sealing pressure as 290kpa and heat sealing temperature as 100 ℃ Then clamp the sample on the thermal seal and thermal viscosity tester, and start the test After the equipment reaches the set delay time after the thermal seal of the sample, it will test its thermal viscosity strength according to the set speed, and take another two samples for parallel test Then the heat sealing temperature was raised to 110 ℃, 115 ℃ and 120 ℃ successively According to the above method, the thermal viscosity strength of three samples was tested at each temperature 3 The results show that in the whole test process, the heat sealing strength is basically the same as that of the heat viscosity strength test process, which is to heat seal the sample, and then pull and destroy the heat sealing part of the sample after heat sealing The difference lies in the time of testing the strength after heat sealing The test of the thermal viscosity strength needs to be completed within a few seconds (or even one second) before the heat sealing part has cooled to room temperature The different testing time points have a greater impact on the test value of the thermal viscosity strength The heat sealing strength is tested after the heat sealing part is cooled, and the test value is not affected by the selected time point Therefore, the heat seal test must be completed in one step, and the test time cannot be controlled by human operation, intervention or interruption, otherwise it is difficult to control the test time, and the heat seal and test operation of the heat seal test can be interrupted Through the definition of delay time and fixture speed, this test ensures that the test time points of the thermal viscosity strength of each sample are consistent See Table 1 for the test results of the heat sealing strength and the heat viscosity strength of the tested samples under different heat sealing temperatures Table 1 test times of test results of heat sealing strength and heat viscosity strength of sample heat sealing strength (n / 15mm) heat viscosity strength (n / 15mm) 100 ℃ 110 ℃ 115 ℃ 120 ℃ 100 ℃ 110 ℃ 115 ℃ 120 ℃ 1 1.31 10.19 16.31 12.01 0.05 0.52 1.76 0.19 2 1.22 11.14 17.07 11.83 0.03 0.57 1.81 0.16 3 1.27 10.83 17.18 11.19 0.02 0.49 1.83 0.21 average 1.27 10.72 16.85 11.68 0.03 0.53 1.80 0.19 From the test results, under the same test conditions, the thermal viscosity strength of the sample is significantly lower than its thermal sealing strength, that is, the binding fastness of the sample before cooling is lower than that after cooling, which is related to the fact that the molecules of the thermal sealing material before cooling have not been fixed and are more prone to deformation Therefore, in the actual production process, we should pay attention to the test of the thermal viscosity of packaging materials, especially the production mode of filling immediately after the hot sealing bag making, so as to prevent the damage of the thermal sealing edge under the impact of the filling product due to the low thermal viscosity of the packaging, which may affect the sealing performance of the packaging, or even cause the bag breaking The test results at four different heat sealing temperatures show that the heat sealing strength and the thermal viscosity strength of the samples are low at 100 ℃, high at 115 ℃, and low at 120 ℃, and the samples shrink, which shows that the two test indexes increase first and then decrease with the increase of the heat sealing temperature According to the test values of heat sealing strength and heat viscosity strength and the flatness of the sample surface, the suitable heat sealing temperature range of Zui for the 40 μ m PE film sample is 110 ℃ ~ 115 ℃ 4 Conclusion: the heat sealing strength and the heat adhesive strength are the important indexes related to the air leakage and bag breaking at the sealing place of the soft plastic packaging According to the comparison test of the two indexes of the membrane sample, the basic test process and test results of the two indexes have the same trend with the change of the heat sealing temperature, while the heat sealing strength and the heat viscosity strength test time are different, and under the same heat sealing parameters, the heat viscosity strength is significantly lower than the heat sealing strength  
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