Monitoring method of heat sealing strength of packaging film for tobacco

Abstract: among the many parameters that affect the performance of cigarette packaging film, heat sealing strength is one of the most important parameters, which is directly related to the integrity of cigarette packaging In this paper, hst-h3 heat sealing tester and XLW (PC) intelligent electronic tensile testing machine are used as testing equipment to test the heat sealing strength of a brand of cigarette outer packaging film The principle, application scope, parameters, testing process and other contents of the equipment are introduced, which provides a practical test method for enterprises to monitor the heat sealing strength of cigarette packaging film Key words: cigarette packaging film, heat sealing strength, heat sealing performance, heat sealing temperature, heat sealing pressure, heat sealing time, heat sealing tester, intelligent electronic tensile tester, soft plastic packaging 1 Significance In order to ensure the packaging speed of cigarettes, improve the production efficiency, prevent the cigarettes from moisture absorption during storage or shelf life, and have a good appearance, the plastic film for cigarette outer packaging should have good smoothness, antistatic performance, high moisture resistance, excellent shrinkage performance and optical performance, etc To achieve the above functions, excellent heat sealing performance is also indispensable, including a wide heat sealing range and high heat sealing strength If the heat sealing performance of the package is poor, it is easy to have problems such as flying package and broken package in the packaging production line, which will affect the production efficiency of cigarettes; if the heat sealing strength of the package is low, it is likely to cause poor sealing performance of the whole package of cigarettes, and the water vapor in the environment can easily enter the package from the heat sealing part with poor sealing performance, no matter how high the moisture resistance performance of the film material is, Cigarettes are also easy to absorb moisture, which leads to mildew; in addition, the heat sealing temperature set by different manufacturers is not exactly the same Even if the same heat sealing temperature is set, the actual heat sealing temperature of the cigarette packaging film is not the same due to the difference of the heat sealing temperature control system of different cigarette packaging machines Therefore, if the heat sealing temperature range of the cigarette packaging film is narrow, the cigarette package The range of adjustable heat sealing temperature is very narrow When the setting of heat sealing temperature is slightly higher, the surface of packaging film is prone to shrink, which affects the appearance of packaging If the heat sealing temperature is slightly lower, the heat sealing strength of packaging will be lower and the sealing will not be tight Therefore, good heat sealing performance and suitable heat sealing parameters are the necessary conditions to ensure the reliable sealing of cigarette pack Fig 1 packaging film for cigarette 2 Test basis: test the heat sealing strength of samples under different heat sealing temperatures according to ASTM f2029, and determine the appropriate heat sealing temperature range of Zui 3 In this paper, a brand of cigarette packaging film is used as the test sample 4 In this paper, hst-h3 heat sealing tester is used to heat seal the samples at different heat sealing temperatures XLW (PC) intelligent electronic tensile testing machine is used to test the heat sealing strength of the samples These two types of equipment are independently developed and produced by Jinan Languang Electromechanical Technology Co., Ltd Figure 24.1 test principle heat seal temperature, pressure and time are three heat seal parameters closely related to heat seal strength Fix the heat sealing pressure and time, test the heat sealing strength of the samples under different heat sealing temperature By comparing the surface state and heat sealing strength of the heat sealing samples, we can get the suitable heat sealing temperature range of Zui Similarly, fix the other two parameters, we can get the appropriate heat sealing pressure and heat sealing time range respectively 4.2 equipment parameters (1) hst-h3 heat sealing tester: the heat sealing temperature can be controlled to room temperature ~ 300 ℃, the temperature control accuracy is ± 0.2 ℃; the adjustment range of heat sealing time is 0.1 ~ 999.9s; the control range of heat sealing pressure is 0.05 MPa ~ 0.7 MPa The upper and lower thermal heads can control temperature independently, and the digital p.i.d temperature control technology can quickly reach the set temperature, and effectively avoid temperature fluctuations The lower cylinder design ensures the stability of the instrument in the process of operation, and makes the pressure of the sample even during heat sealing The manual and pedal test start modes are adopted, and the safety design of anti scald is configured to effectively ensure the convenience and safety of the test personnel (2) XLW (PC) intelligent electronic tensile testing machine: 500 N, 50 N two kinds of force value sensors are available 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 tension, peeling, tearing, etc., providing users with a variety of test options 4.3 scope of application (1) hst-h3 heat sealing tester: it is applicable to the heat sealing test of soft plastic film, jelly cup cover, plastic hose and other types of samples, among which the soft plastic film includes various plastic film, paper plastic composite film, CO extrusion film, aluminum coating film, aluminum foil, aluminum plastic composite film, etc Meet the requirements of ASTM f2029, ybb00122003 and other domestic and foreign standards (2) XLW (PC) intelligent electronic tensile testing machine: it can be used to test the tensile property, breaking force, tensile strength and deformation rate, tear resistance, peel strength, heat sealing strength and puncture resistance of plastic film, composite film, thin film and other materials; it can be used to test the puncture performance 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 It can meet more than 20 domestic and foreign relevant standards, such as iso37, GB / T 10004, GB 8808, GB / T 1040.1, GB / T 1040.2, GB / T 1040.3, GB / T 1040.4, GB / T 1040.5, QB / T 2358, QB / T 1130, ASTM d882, ASTM D1938, ASTM d3330, etc 5 Test process 5.1 heat sealing (1) cut 12 pieces of 8 cm × 10 cm sample from the surface of cigarette packaging film (2) Set the heat sealing time as 1s, the heat sealing pressure as 0.18 MPa and the heat sealing temperature as 110 ℃ on the hst-h3 heat sealing tester When the equipment reaches the set temperature, take two samples, contact and align the heat sealing surface, put the long side between the two heat sealing knives, step on the foot switch to heat sealing (3) Set the heat sealing temperature as 115 ℃, 120 ℃, 125 ℃, 130 ℃, 135 ℃ respectively, and take two samples for heat sealing test under each temperature 5.2 heat sealing strength test (1) cut 5 test strips with a width of 15.0 mm from 6 groups of heat sealed samples along the direction perpendicular to the heat sealing edge (2) Parameter information such as sample name, test speed (100 mm / min), test times (30 times), sample width (15.0 mm) are set on XLW (PC) intelligent electronic tensile testing machine (3) Install the free ends on both sides of one sample bar in the upper and lower clamps of the equipment, so that the heat seal part is in the middle of the two clamps, the longitudinal axis of the sample bar coincides with the center line of the two clamps, click the test option, the upper clamp moves upward, the equipment displays the force value curve during the destruction of the heat seal part in real time, and reports the heat seal strength value after the test Repeat the above loading process and click the test operation until all 30 samples are tested 6 Test results take the average value of the test values of five samples at each temperature as the heat sealing strength at that temperature and record the test phenomenon: the heat sealing strength of the sample at 110 ℃ is 0.91 n / 15mm, and the heat sealing part is flat; the heat sealing strength of the sample at 115 ℃ is 3.87 n / 15mm, and the heat sealing part is flat; the heat sealing strength of the sample at 120 ℃ is 4.05 n / 15mm, and the heat sealing part is flat; 125 The heat sealing strength of the sample is 4.01 n / 15mm at ℃, and the heat sealing part is flat; the heat sealing strength of the sample is 4.09 n / 15mm at 130 ℃, and the heat sealing part is flat; the heat sealing strength of the sample at 135 ℃ is 3.46 n / 15mm, and the heat sealing part shrinks and breaks at the root of the heat sealing 7 Conclusion the heat sealing strength of cigarette packaging film is an important factor affecting the sealing performance and bag breaking rate of cigarette package Through the test of heat sealing strength of cigarette packaging film samples under different heat sealing temperatures, it is determined that the reasonable range of heat sealing temperature of the sample is 115 ℃ ~ 130 ℃, the test process is simple, the equipment is easy to operate, and the test results are reliable By using hst-h3 heat sealing tester and XLW (PC) intelligent electronic tensile testing machine, the reasonable range of heat sealing pressure and time can also be determined Jinan Languang mechanical and Electrical Technology Co., Ltd is a high-tech enterprise specializing in the research, development and production of packaging testing equipment and packaging testing services The existing equipment can also test the thickness, tensile strength, elongation at break, heat shrinkage, haze, friction coefficient, moisture permeability and other properties of packaging film for tobacco The more you understand, the more you trust! 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