Quality control and inspection of packaging film f

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Quality control and detection of cigarette packaging film

in order to facilitate enterprises to better control the quality indicators of cigarette packaging film and understand the detection methods, Labthink blue light introduces the detection indicators and detection methods of cigarette packaging film in combination with the needs of relevant production enterprises, in order to help cigarette packaging film and cigarette production enterprises

1. Cigarette packaging film water vapor barrier cigarette packaging requires that the cigarette film should have high water vapor barrier performance to prevent mildew caused by dampness. At present, this detection index is not paid enough attention in cigarette factories or cigarette bag production enterprises, but the moisture-proof detection of cigarette packaging has been more standardized in foreign countries. Taking the W of Labthink blue light as an example, the water vapor transmission rate of materials is tested according to gb1037, astme96 and iso2528 standards. It is required that the smaller the water vapor transmission is, the better. However, to achieve a higher water vapor resistance performance, the cost needs to be increased. Generally, the industry is less than 10g/y (but according to experience, less than 5g/y is more ideal)

2. Thickness of cigarette packaging film thickness of cigarette packaging film is the basic index for laboratory testing of film performance. Uneven thickness will not only affect the tensile strength and barrier properties of the smoke film, but also affect the subsequent processing of the smoke film. The thicker the smoke film is, the better the machine performance will be, and the stiffness will be high. The visual beauty of the appearance outline of the wrapped cigarette bag is better, but the cost is high. To find the balance point of control, we need to use a high-precision thickness gauge. The chy-c2 of Labthink blue light is a laboratory thickness gauge with an accuracy of 0.1um. When testing the thickness, we must pay attention to not only measuring the vertical and horizontal thickness, but also controlling the deviation, which is generally controlled within 3%. At the same time, we also need to detect the thickness of the film edge, which is extremely important

3. Tensile strength, elongation and elastic modulus of cigarette packaging film cigarette packaging requires that the cigarette packaging film has high tensile strength. If the production must be reorganized, the machine should be stopped resolutely, so as to reduce the damage of the film in the packaging process as much as possible. Generally, it is required to be more than 140n/mm2 in the longitudinal direction and more than 220n/mm2 in the transverse direction. The test of elongation at break is used to analyze the cutting ability of the film. Unlike other industries, the cigarette bag industry is not that the greater the elongation at break, the better. The cigarette bag industry generally requires that the longitudinal elongation be controlled below 200% and the transverse elongation be controlled below 80%. In this way, it is easier to cut off when running the machine and increase the smoothness of the production process. In general, the two indicators are mainly tested in the industry. However, with the more specific requirements for the straightness of the smoke film and the ease of cutting due to high-speed production, there are also requirements for the detection of the elastic modulus. Labthink Languang's XLW (PC) intelligent electronic tensile testing machine is a tensile machine specialized in film detection, and it also has the function of detecting the elastic modulus. The elastic modulus is not easy to be too small, otherwise the film is soft and poor rigidity, which also leads to poor cutting and operation, and even leads to loose packages, film blockage and other phenomena. Generally, the elastic modulus of smoke film is required to be above 2000n/mm2. However, when testing the elastic modulus, we must pay attention to the test conditions. If the machine can also operate to test the temperature, the data will change greatly (the higher the temperature is, the lower the elastic modulus is), so we must note that the test must be able to maintain our impactor well Conditions

4. Heat sealing strength of cigarette packaging film the cigarette industry requires that cigarette packaging film must have high heat sealing strength and wide heat sealing range, so as to improve the packaging speed and operation adaptability. Of course, if the heat sealing temperature of the cigarette packaging film is high, it will lead to the wrinkle phenomenon caused by the large shrinkage of the cigarette film. Therefore, according to the actual situation, select the appropriate heat sealing temperature for the normal operation of the hydraulic system to avoid the phenomena of loose heat sealing, flying bags, wrinkles and so on. The heat sealing of cigarette packaging film adopts the method of hot pressing, that is, sealing under the set heat sealing temperature, heat sealing pressure and heat sealing time. The detection of heat sealing strength is to detect the minimum force required to separate the heat sealing after heat sealing. Hst-h3 heat seal tester and XLW (PC) intelligent electronic tensile testing machine are commonly used in the industry. Generally, the heat sealing strength of smoke film is required to be more than 2.0n/15mm. Nowadays, with the improvement of cigarette packaging machine production efficiency, the low-temperature heat sealing film on the market is receiving more and more courtesy. The heat sealing strength of this low-temperature heat sealing film is generally required to be greater than 1.5n/15mm

5. Friction coefficient of cigarette packaging film

the smoothness performance of cigarette packaging film is an important index in the comprehensive index, and it is the detection demand generated by the high-speed packaging

in the cigarette packaging process and the whole production process, there are four kinds of friction coefficient tests: ① the friction coefficient between the outside of the film and the mechanical metal surface or the conveyor belt ② the inside and inside of the film, ③ the inside and outside of the film ④ the outside of the film and the carton. The friction coefficient between the outer side of the film and the mechanical metal surface should be low, so as to facilitate the transportation of cigarette packs on the production line and improve the packaging production speed. The friction coefficient between the inside and the inside of the film should be slightly higher than the friction coefficient between the outside of the film and the metal, so as to facilitate the precise fixation of the position of the film and the cigarette box paper, and improve the heat sealing quality and packaging effect. The friction coefficient between the film and the carton should be low, so that the cigarette package can be loaded smoothly. In general, the test preparation is carried out according to gb10006 standard in the industry, and the test speed is 100mm/min (150mm/min for American Standard). The mxd-02 friction coefficient of Labthink Languang is extremely satisfied with national standards, American standards, international standards and other standards, so it is adopted by enterprises in the industry. Because there are many references for cigarette pack friction coefficient detection (such as metal plate, cigarette box, inner side to inner side, outer side to inner side), the data range is large, and the friction coefficient is generally from 0 6

6. Detection of thermal shrinkage of cigarette packaging film

thermal shrinkage of cigarette packaging film is mainly used to evaluate the dimensional thermal stability of cigarette packaging film under different conditions or factors. For hard box cigarettes, because the cigarette box has a good strength support effect, the cigarette film with high shrinkage can be used, which can achieve a flat and beautiful visual effect. Therefore, it is generally required that the thermal shrinkage of cigarette packaging film should reach 8% - 12%. However, soft cigarette packs need to be prevented from deformation due to excessive shrinkage. The shrinkage rate is generally controlled at 3% - 7% in the industry. For the detection of the thermal shrinkage rate of cigarette packaging film, at present, the industry basically refers to gb/t13519 or American astmd2732 standards for detection. Here, taking the rsy-r2 thermal shrinkage tester of Labthink blue light as an example, draw a symmetrical axis in the longitudinal and transverse directions of the sample for marking, and mark the longitudinal and transverse directions. Place the sample flat between the two frames, then quickly immerse it in the constant temperature medium of 120 2 ℃ for free shrinkage, and take it out after 20 seconds, Immerse in the standby normal temperature bath, take out the sample after cooling for 5S, stand horizontally, and measure the size of the vertical and horizontal axis of symmetry within 30min. Accurate to 1mm, and record the measurement data. At present, some enterprises use 120 ℃, heating for 1 minute or 5 minutes and other test conditions. The test results will be different under different test conditions

7. Cigarette packaging film scratch resistance (wear resistance) now the cigarette industry has increasingly strict requirements for film scratch resistance. Poor scratch resistance of cigarette packs will greatly affect the appearance. The detection of wear resistance mainly comes from two aspects: first, the rapid contact and friction between the film surface and the machine in the process of high-speed packaging production will form scratches on the product surface; second, in the process of product transportation, The film surface and the packing box or other surfaces rub against each other to produce the phenomenon of scratch. However, there is no national or industrial standard for reference in the industry at present. Labthink blue light summarizes the current testing situation in the industry. Basically, it refers to the method of testing the wear resistance of printing ink layer in gb7706 standard, which can be tested with mcj-01a friction tester. The cleaning offset paper with a width of 50mm and 80g/m2 is fixed on the load block of the friction tester, the smoke film is cut into a certain size and installed on the friction table, the friction times are set (the implementation of each enterprise is different), the test is started, and the scratch condition is checked after the test. In short, there are many testing items of cigarette packaging film, so the testing must be carried out according to the standards. If there is no standard, the test conditions must be unified, so that the data can be comparable

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