Abstract: Among the many parameters affecting the performance of cigarette packaging film, heat seal strength is one of the most important parameter indicators, which is directly related to the integrity of cigarette packaging. In this paper, HST-H3 heat seal tester and XLW (PC) intelligent electronic tensile tester are used as testing equipment to test the heat seal strength of a brand of cigarette outer packaging film, and introduce the principle, scope and parameters of the equipment, test process Such content provides a practical test method for enterprises to monitor the heat seal strength of cigarette packaging film.
Key words: packaging film for cigarettes, heat seal strength, heat seal performance, heat seal temperature, heat seal pressure, heat seal time, heat seal tester, intelligent electronic tensile tester, soft plastic packaging
1 , meaning
In order to ensure the packaging speed of cigarettes, improve production efficiency, prevent cigarettes from absorbing moisture during storage or shelf life, and have a good appearance, the plastic film for cigarette packaging should have good smoothness, antistatic properties and high Humidity resistance, excellent shrinkage and optical properties. To achieve the above functions, excellent heat sealing performance is also indispensable, including a wide heat sealing range and a high heat sealing strength. If the heat sealing performance of the package is poor, it is easy to cause problems such as flying bags and broken bags in the packaging production line, which affects the production efficiency of the cigarette; the lower heat sealing strength of the package may lead to the sealing performance of the whole package of the cigarette. Poor, the water vapor in the environment can easily enter the inside of the package from the poorly sealed heat-sealed parts. No matter how high the moisture resistance of the film material is, the cigarettes are very easy to absorb moisture, and then moldy problems occur. In addition, different manufacturers set up The heat sealing temperature is not exactly the same. Even if the same heat sealing temperature is set, the 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 wrapping machines. The heat sealing temperature range of the packaging film is narrow, and the heat sealing temperature range of the cigarette packaging machine can be narrowed. When the heat sealing temperature is set slightly higher, the surface of the packaging film is prone to shrinkage, which affects the appearance of the package, and the heat sealing temperature. A little lower will result in a lower heat seal strength and a tighter seal. Therefore, good heat sealing performance and suitable heat sealing parameters are necessary for ensuring reliable sealing of the cigarette pack seal.
Figure 1 cigarette packaging film
2 , testing basis
This test is based on the heat seal strength of ASTM F2029 test samples at different heat seal temperatures to determine the appropriate heat seal temperature range for zui .
3 , test samples
This article uses a brand of cigarette packaging film as a test sample.
4 , test equipment
In this paper, the HST-H3 heat seal tester is used to heat seal the samples at different heat sealing temperatures, and the heat seal strength of the samples is detected by XLW (PC) intelligent electronic tensile tester. Both of these devices are manufactured by Jinan Languang Electromechanical Co. , Ltd. Technology Co., Ltd. independently developed and produced.
Figure 2
4.1 Test principle
The heat sealing temperature, heat sealing pressure and heat sealing time are three heat sealing parameters closely related to the heat sealing strength. Fix the heat-sealing pressure and heat-sealing time, test the heat-sealing strength of the sample at different heat-sealing temperatures, and compare the surface state of the heat-sealed sample with the heat-sealing strength value to obtain a suitable heat-sealing temperature range of Zui. Two parameters can respectively obtain the appropriate heat sealing pressure and heat sealing time range.
4.2 Equipment parameters
(1) HST-H3 heat seal tester: heat seal temperature can be controlled to room temperature ~ 300 °C , temperature control accuracy is ±0.2 °C ; heat seal time adjustment range is 0.1 ~ 999.9s ; heat seal pressure control range is 0.05 MPa ~ 0.7 MPa . The upper and lower heat seal heads can independently control the temperature, and adopt digital PID temperature control technology to quickly reach the set temperature and effectively avoid temperature fluctuations. The use of the lower-mounted cylinder design ensures the stability of the instrument during operation and makes the sample evenly pressed during heat sealing. The manual and pedal test start mode is adopted, and the safety design of anti-scalding is configured to ensure the convenience and safety of the tester.
(2) XLW (PC) intelligent electronic tensile testing machine: 500 N , 50 N two kinds of force sensor 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 , according to the test standard. Require free setting. The long stroke of 1000 mm can be used to test materials with large deformation rates. Intelligent configuration such as limit protection, overload protection, automatic return and power-down memory to ensure the user's operation safety. A test machine integrates seven independent test procedures, such as stretching, peeling and tearing, to provide users with a choice of test items.
4.3 Scope of application
(1) HST-H3 heat seal tester: It is suitable for heat sealing test of soft plastic film, jelly cup cover, plastic hose and other types of samples. Soft plastic film includes various plastic film, paper-plastic composite film, co-extrusion. Film, aluminized film, aluminum foil, aluminum-plastic composite film, and the like. Meet ASTM F2029 , YBB00122003 and other domestic and international standards.
(2) XLW (PC) intelligent electronic tensile testing machine: can be used for tensile properties, tensile strength, tensile strength and deformation rate, tear resistance, peel strength performance, heat of plastic film, composite film, sheet and other materials Test of strength performance, puncture resistance and other indicators; can be used for infusion bag cover, soft rubber stopper, oral liquid cap puncture / pull force test; can be used for tape unwinding force, plastic bottle anti-pressure, combination cover and jelly The product and packaging performance of the cup, the opening force of the yoghurt cup cover film. Can meet 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 , More than 20 domestic and international standards such as ASTM D1938 and ASTM D3330 .
5 , the test process
5.1 heat seal
(1) 12 pieces of a sample of 8 cm × 10 cm were cut out from the surface of the sample film for smoking .
(2) Set the heat sealing time to 1s on the HST-H3 heat seal tester , the heat seal pressure to 0.18 MPa , and the heat seal temperature to 110 °C . After the equipment reaches the set temperature, take 2 samples, hot cover Contact and align, place the long edge between the two heat seal knives, step on the foot switch, and heat seal.
(3) The heat sealing temperature was set to 115 ° C , 120 ° C , 125 ° C , 130 ° C , and 135 ° C , respectively, and two samples were taken at each temperature for heat sealing test.
5.2 Heat seal strength test
(1) Edge direction perpendicular to the direction of the heat, good heat seal 6 from the set of samples taken were cut to a width of 15.0 mm sample strip 5.
(2) Set parameter information such as sample name, test speed (100 mm/min) , number of tests (30 times ) , and sample width (15.0 mm ) on the XLW (PC) intelligent electronic tensile testing machine .
(3) The free ends of one of the sample strips are respectively clamped in the upper and lower fixtures of the device, so that the heat seal portion is in the middle of the two clamps, and the longitudinal axis of the sample strip coincides with the center line of the two clamps. Option, the upper clamp moves upwards, the device 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 ends. Repeat the above loading process and click on the test operation until all 30 samples have been tested.
6 , test results
Take the average of the test values of 5 samples at each temperature as the heat seal strength at this temperature and record the test phenomenon:
The heat-sealing strength of the sample at 110 °C is 0.91 N/15mm , and the heat-sealed portion is flat; the heat-sealing strength of the sample at 115 °C is 3.87 N/15mm , and the heat-sealed portion is flat; the heat-sealing strength of the sample at 120 °C is 4.05 N/15mm , the heat-sealed part is flat; the heat-sealing strength of the sample is 4.01 N/15mm at 125 °C , and the heat-sealed part is flat; the heat-sealing strength of the sample at 130 °C is 4.09 N/15mm , and the heat-sealed part is flat; The heat-sealing strength of the sample at 135 °C was 3.46 N/15 mm , and the heat-sealed portion shrunk and broke at the root of the heat-sealed joint.
7 , conclusion
The heat-sealing strength of cigarette packaging film is an important factor affecting the sealing and bag breaking rate of cigarette packets. The heat sealing temperature of the sample is determined by testing the heat-sealing strength of cigarette packaging film samples at different heat-sealing temperatures. The reasonable range of Zui is 115 °C ~ 130 °C , the test process is simple, the equipment is easy to operate, and the test results are accurate and reliable. Using the HST-H3 heat seal tester and the XLW (PC) intelligent electronic tensile tester, the reasonable range of heat seal pressure and heat seal time of the sample can be determined. Jinan Languang Electromechanical Technology Co., Ltd. is a high-tech enterprise specializing in R&D, production and packaging inspection services for packaging inspection equipment. The existing equipment can also test the thickness, tensile strength, elongation at break and heat shrinkage of cigarette packaging film . , haze, friction coefficient, moisture permeability and other properties . The more you understand, the more you trust! Labthink is looking forward to enhancing technical communication and cooperation with enterprises and institutions in the industry.
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