Abstract: The smoothness of the soft plastic film used in the packaging process of cigarettes is an important factor affecting the operation and speed of the packaging machine. In this paper, the friction coefficient of the soft plastic smoke film sample at 60 °C was tested using Labthink blue light FPT-F1 friction coefficient / peel tester , and the basic process of the test and the applicable scope of the test equipment, equipment parameters, etc. were briefly introduced. It can be used as reference when selecting the soft plastic package slip performance test equipment and test method.
Keywords: Cigarette Packaging Film, Flexible Packaging, Smoke Film, Slidability, Friction Coefficient, Static Coefficient of Friction, Dynamic Coefficient of Friction, Friction Coefficient / Peel Tester
1 , the meaning
The soft plastic film used on the outside of the cigarette box is mostly biaxially oriented polypropylene film (BOPP) . Such materials have the advantages of high transparency and gloss, good shrinkage, and certain moisture resistance and fragrance protection. Friction coefficient is an important performance index of the smoke film, and its performance is related to the speed of cigarette packaging, whether the packaging machine can run stably and the packaging effect is good or bad. The coefficient of friction of the smoke film relates to the friction coefficient between the outer surface of the packaging film and the metal, the friction coefficient between the inner surface of the packaging film and the cigarette pack carton, and usually the outer surface of the smoke film has a low coefficient of friction and the inner surface has a coefficient of friction. High demand. In general, the coefficient of friction coefficient of soft plastic packaging has a great relationship with the temperature of the packaging film itself. At the production site of cigarettes, the process of friction between the inner surface of the packaging film and the cigarette pack carton is performed at room temperature. However, during the operation of the packaging equipment, the temperature of each component of the equipment is higher than room temperature, so the friction coefficient generated when the outer surface of the packaging film slides on the equipment and the friction coefficient of the packaging film at room temperature are quite different.
Figure 1 soft plastic cigarette packaging
2 , the status quo
The test standard for the coefficient of friction of soft plastic packaging in China is GB 10006-1988 “Measurement Method for Friction Coefficient of Plastic Film and Sheetâ€. The standard requires that the test be conducted in a standard environment. This article refers to the US standard ASTM D1894 to detect the test sample. Friction coefficient at 60 °C .
3 , test sample
A brand of soft packaging film for cigarette packaging.
4 , test equipment
Jinan Languang Electromechanical Technology Co., Ltd. independently developed FPT-F1 friction coefficient - peel tester.
Figure 2 FPT-F1 Friction Coefficient - Peel Tester
4.1 Test principle
According to this test detected friction coefficient derived from the definition - and the ratio of frictional force is perpendicular to the contact surface of the pressure. The static friction coefficient and dynamic friction of the sample can be obtained by applying a certain vertical pressure to the sample with a weight of a known weight, and then testing the maximum static frictional force and sliding frictional force generated from the relatively static to relative sliding of the sample. coefficient.
4.2 Scope of application
(1) This equipment is suitable for the dynamic and static friction coefficient of plastic, film, sheet, foil, paper, cardboard, woven bags, fabrics, composite materials of metal materials for communication cables, cable, conveyor belts, textiles, and papermaking.
(2) This device is applicable to the determination of the peel strength of adhesive composite products, medical patches, release papers, and protective films.
(3) The equipment can meet a number of national and international standards, such as ISO 8295 , ISO 8510-2 , GB 10006 , GB/T 2790 , GB/T 2791 , GB/T 2792 , ASTM D1894 , ASTM D4917 , ASTM D3330 , TAPPI T816 , TAPPI T549 .
4.3 Equipment Parameters
The load range is divided into 0 ~ 5 N , 0 ~ 10 N , 0 ~ 30 N third gear. Test accuracy is 0.5 . Seven test speeds are available: 50 mm/min , 100 mm/min , 150 mm/min , 200 mm/min , 250 mm/min , 300 mm/min , 500 mm/min , meeting different standards Testing requirements. The test temperature is controlled from room temperature to 99.9 °C . Both the instrument test bench and the test slider are demagnetized and remanently tested, effectively reducing system test errors.5 , the test process
(1) uniformly along the longitudinal direction of the sample clipping 6.35 cm × 10 cm, 25 cm × 13 cm 3 of two specifications of each sample, a sample taken from each sample of each size in a set of samples consisting of , Form 3 sets of samples.
(2) Select the friction coefficient test mode and set test parameters such as test speed, test temperature, and stroke.
(3) The 6.35 cm × 10 cm tobacco film sample is clamped on the slider, and the inner surface of the sample is in direct contact with the slider; after the test platform reaches the set temperature, the 25 cm × 13 cm sample is tiled. On the test platform, fix it with tape or sample holder, with the outer surface of the sample facing up. A system for measuring the coefficient of friction between the outer surfaces of the test specimens is formed. During the process of mounting the test specimens, the test surfaces of the test specimens cannot be touched, and the test specimens should be flat and free from wrinkles.
(4) Connect the slider to the force sensor with a connecting device, and place the slider without impact on the middle part of the sample fixed on the test platform so that the sliding direction of the sample is parallel to the test direction.
Figure 3 sample mounting process
(5) Click on the start option and the test starts. The equipment automatically calculates the friction coefficient and displays the test results based on the change in the force during the test.
6 , test results
The average values ​​of the coefficient of friction of the smoke film tested at 60 °C are: static friction coefficient 0.511 and dynamic friction coefficient 0.469 .
7. Conclusion
Because the temperature of the equipment during the operation of the cigarette packaging equipment is often higher than room temperature, this temperature change will most likely affect the coefficient of friction between the film and the equipment. Therefore, the friction of the film is tested at a practically attainable temperature of the packaging equipment. The coefficient can truly reflect the smoothness of the smoke film during use. FPT-F1 Friction coefficient - peel tester is a cost-effective testing equipment, which can be used for the test of peel strength of medical patches, release papers, etc., in addition to the test of dynamic and static friction coefficient of cigarette films. And the equipment is simple to operate, the test result has high precision and repeatability. Labthink is a leader in R&D and manufacturing of packaging inspection equipment, and has always been committed to providing professional, high-end packaging testing equipment and testing services to customers around the world. Existing testing equipment covers the barrier properties, shrinkability, impact resistance and resistance of packaging. Puncture, flexibility, heat seal performance, thermal viscosity, thickness, solvent residue, evaporation residue and other performance indicators. Learn about the relevant testing equipment, you can visit the website of Jinan Languang company to view or call directly for consultation. Jinan Languang Electromechanical Technology Co., Ltd. is willing to take this opportunity to increase technical exchanges and cooperation with enterprises and institutions in the industry.
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