Test method for sealing fastness of FFS heavy packaging film before heat sealing and cooling

Abstract: thermal viscosity is a performance index to evaluate the sealing fastness of FFS heavy packaging film before cooling It is an important factor to affect the breaking rate of FFS heavy packaging film In this paper, i-thermotek 2400 thermal sealing and thermal viscosity tester is used to test the thermal viscosity of a kind of heavy packaging film Through the introduction of the test principle, equipment parameters, application scope, test process and other contents, it can provide reference for the measurement of the thermal viscosity of FFS heavy packaging film and the adjustment of the thermal sealing parameters Key words: thermal adhesive property, thermal adhesive strength, thermal sealing and thermal adhesive property tester, sealing fastness, heavy packaging film, thermal sealing parameters, broken bag 1 Compared with traditional packaging, FFS heavy packaging film has two characteristics: one is the one-time molding of bag making packaging, that is, the packaging link is automatic bottom cutting molding (form) - automatic filling (fill) - automatic sealing of bag mouth (seal) It has the advantages of low labor cost, flexible production, etc.; secondly, the quality of the packed contents is large, with a general load of 10-50 kg, which can be used for the packaging of resin, chemical raw materials, food, grain, building materials, animal feed and other products, with the advantages of material saving, good sealing, beautiful appearance, etc FFS heavy packaging film adopts automatic packaging technology, and the packaging speed can reach 1200-2000 bags/ Therefore, a few seconds after sealing or even just when sealing, the packaging will be impacted by the filled content At this time, the sealing has not been cooled, and the sealing fastness is low Under the impact of the content, the sealing is easy to be damaged, reducing the impact resistance or extrusion capacity of the sealing, and the bag is easy to be broken in the storage or transportation process Therefore, it is of great significance to improve the thermal adhesive strength (i.e sealing fastness) when the seal is not cooled to reduce the bag breaking rate of FFS heavy packaging film 2 Test sample in this paper, the FFS heavy packing film produced by a coextrusion process is used as the test sample 3 According to the test results, the sealing fastness of the packaging bag before and after cooling is quite different, and the sealing fastness of the packaging bag before cooling is relatively low It is difficult to reflect the sealing fastness of the sample before cooling by using the general heat sealing strength test method Therefore, this paper reflects the sealing fastness of the sample before cooling by testing the thermal viscosity strength of the sample The test process is in accordance with GB / T 34445-2017 determination of thermal viscosity of thermoplastic and its composite thermal cover 4 The test equipment is tested by i-thermotek 2400 thermal sealing and thermal viscosity tester, which is independently developed and produced by Jinan Languang Electromechanical Technology Co., Ltd Fig 1 i-thermotek 2400 thermal seal and thermal viscosity tester 4.1 test principle the thermal viscosity is mainly measured by the size of the thermal viscosity strength, which reflects the sealing fastness of the sample after the thermal seal before the edge is cooled In order to ensure the accuracy of the test results, the test process of the thermal sealing and the thermal viscosity strength of the sample is completed by the same equipment Firstly, the specimen is heat sealed by setting the heat sealing parameters, and then after a certain time delay, the specimen fixture is withdrawn to the initial state of strength test and the strength test process, the whole test of the thermal viscosity strength is completed at the very least By setting different heat sealing parameters and testing the corresponding heat viscosity strength, the best heat sealing parameters can be determined according to the test results, so as to ensure that the edge sealing of the sample has good sealing fastness before it is cooled 4.2 scope of application (1) this equipment is applicable to the test of the thermal adhesion, heat sealing performance and heat sealing strength of various plastic film, paper plastic composite film, coextrusion film, aluminum coating film, aluminum foil, aluminum foil composite film and other film-like materials (2) The equipment meets GB / T 34445, ASTM f1921, ASTM f2029, astmf88, QB / t2358 (ZBY 28004), YBB 00122003 and other standards 4.3 the control range of equipment parameters, thermal viscosity and heat sealing performance is room temperature ~ 250 ℃, and the temperature control resolution is ± 0.1 ℃; the temperature control accuracy of heat sealing performance is ± 2 ℃, and the temperature control accuracy of thermal viscosity is ± 1 ℃; the control range of heat sealing pressure is 0.05 ~ 0.7MPa; the setting range of heat sealing time is ≤ 99.9s; the load range of strength test is 0 ~ 50N The test speed of heat sealing strength test is 200 mm / min, 250 mm / min and 300 mm / min; the test width of sample includes 15 mm, 25 mm and 25.4 mm; the upper and lower heat sealing heads can independently control the temperature; two test start modes of manual and pedal as well as the anti scald device ensure the convenience and safety of users 5 During the test (1) set the parameters such as heat seal temperature, heat seal pressure, heat seal time, sample name and test width on the control software of the equipment, and select test method B (2) Cut 5 samples with a width of 15 mm and a length of at least 25 mm along the longitudinal direction of the sample to be tested (3) After the equipment reaches the set heat seal temperature, take one of the samples, and clamp the two ends of the sample in two sample clamps, so that the sample bypasses the sample drag mechanism, and the heat cover contacts with the drag mechanism (4) Move the dragging mechanism to make the hot cover of the sample contact with each other and enter into the hot sealing knife, step on the foot switch, the hot sealing knife will heat seal the sample, and release the dragging mechanism at the same time The equipment will heat seal the sample according to the set heat sealing parameters, and the hot sealing knife will automatically separate After a delay of 0.1s, the fixture will withdraw to the initial state of the hot adhesive strength test within 0.1s, and then 200 mm / s The separation speed of the fixture pulls the heat seal part, and the thermal viscosity strength of the fixture is tested by the force value sensor configured on the fixture (5) According to the operation of sample clamping - pulling mechanism - stepping foot switch - Loosening the dragging mechanism, the thermal viscosity strength of the remaining four samples was tested in turn 6 The average value of the test results of the five samples is 4.26 n / 15mm, so the thermal viscosity strength of the test samples under the set heat sealing parameters is 4.26 n / 15mm 7 Conclusion the thermal adhesive strength reflects the sealing fastness of packaging materials before the hot edge is cooled, and it is an important index that affects the performance of FFS repackaging film In this paper, the thermal adhesive strength of FFS repackaging film samples under fixed heat sealing parameters is tested The test process is simple, the equipment is highly automatic, the operation is simple, and the test results are accurate and reliable In order to obtain the best range of thermal sealing parameters, the method can be used to test the corresponding thermal sealing strength under different thermal sealing parameters and select the appropriate thermal sealing parameters combined with the test phenomenon In addition to the thermal adhesive strength, the equipment can also test the heat sealing strength of packaging materials Jinan Languang mechanical and Electrical Technology Co., Ltd is a high-tech enterprise specializing in the research and development of packaging testing equipment and packaging testing technology services The more you understand, the more you trust! 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