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Packaging inspection changes according to needs

Abstract: packaging inspection is not unchanging. The progress of inspection technology, the enrichment of inspection methods, and the expansion of inspection demand all appear with the improvement of inspection needs. Nowadays, the gap between China's packaging industry and the world's advanced level has narrowed. There is no standard reference for the detection of some indicators that help to improve the process in actual production. It is inevitable to carry out the development and innovation of packaging detection

key words: packaging inspection, inspection demand, upgraded products, permeability, thermal viscosity, friction coefficient

the rise of packaging inspection stems from people's attention to packaging functions. In order to ensure the realization of the protective function of packaging and other specific functions, the performance of packaging materials must be tested. Packaging inspection is not changed by Ding Xianfei and Wu Yongsheng in Anhui Province. The progress of inspection technology, the enrichment of inspection methods and the expansion of inspection demand all appear with the improvement of inspection needs, which is the main reason for the change of inspection

1. Progress of detection technology

the progress of detection technology includes the subdivision of detection objects, the improvement of the performance of equipment components, and the improvement of testing methods. It is based on technological progress and detection experience, and its main purpose is to make the use of detection equipment more safe and convenient, improve testing accuracy, and expand testing scope. For example, the launch of the special tensile testing machine for flexible packaging materials has accelerated the design and use of the corresponding testing accessories, and the range is completely selected according to the performance of the flexible packaging materials, which is conducive to maximizing the testing accuracy of comprehensively implementing the spirit of the 109th National Congress of the Communist Party of China and the 2nd and 3rd plenary sessions of the 109th Central Committee, and it can bring greater operational convenience to the test process with the special operation analysis software. Another example is a series of heat sealing testers launched by Labthink Languang. Hst-h2 and hst-h3 are upgraded products of hst-h1, with continuously improved performance, which are highly praised by our customers

2. Enrichment of testing methods

for some testing items, it is common for more than three testing methods to appear at the same time in the world, such as the barrier performance of materials. Whether it is air permeability or moisture permeability, there are more than three testing methods

taking the permeability test of materials as an example, its test methods can be divided into two categories: differential pressure method and equal pressure method. The differential pressure method is widely used and can be applied to all conventional gases, including vacuum differential pressure method and positive differential pressure method (volume method). The vacuum differential pressure method can simultaneously detect the permeability coefficient of gas to material, the diffusion coefficient of gas in material and the solubility coefficient of material to gas. With the development of micro oxygen detection technology, micro oxygen sensors are gradually applied to the field of oxygen permeability testing of materials, that is, the sensor method in permeability testing. Different gas sensors can be used to detect the permeability of different gases to materials. At present, the sensor method detection technology for oxygen and carbon dioxide has been mature. In addition, gas chromatography can also be used to detect the permeability of materials, but it is rarely used. Both sensor method and gas chromatography can be classified as isobaric method of permeability test. Therefore, according to the order of time, the gradually emerging permeability testing equipment include vacuum differential pressure method, positive differential pressure method, oxygen sensor method and permeability testing equipment

although there are still some regional characteristics in the formulation of relevant standards for testing methods, the development of trade globalization has led to the coexistence of multiple methods for material performance testing. For the permeability test of materials, it is a prominent need of customers in recent years to provide several test methods at the same time. Although the differential pressure method is mainly used in the permeability test in China, with the formulation of the domestic isobaric method test standard in 2005, the demand for isobaric method equipment in China has increased significantly. As the largest packaging testing equipment manufacturer in China, Labthink Languang has completed the manufacturing of equipment for all film permeability testing methods, such as vac-v1 gas permeameter based on vacuum differential pressure method, bty-b1 permeability tester and bty-b1p permeability tester based on positive differential pressure method, and membrane oxygen permeameter based on oxygen sensor method whose movement of toy-c1 and toy-c2 containers/thin 10 prefix is completed by changing motor. Labthink Languang laboratory can provide various methods of barrier testing, and customers can choose according to their needs

3. The purpose of testing is to ensure the quality of products and maintain the good operation of the production line. However, with the rapid progress of packaging technology, the original small-scale production line cannot be compared with today's high-speed production line in terms of speed and output. The coil that used to be applicable may not be suitable now. At the same time, the various functions of today's packaging are unmatched by the packaging of the past. In view of these new phenomena and functions, the testing items and methods should also keep pace with the times

in the packaging production line, the filling method of the contents is mostly to let the contents fall into the packaging bag from a certain height, so it will have a strong impact on the bottom of the packaging bag. If the bottom of the packaging bag cannot withstand the rupture force caused by the filling of the contents, there will be cracking, resulting in the breakage of the bag. The phenomenon of bag breaking is more prominent on the high-speed vertical form fill seal machine, and of course, it also exists on the low-speed packaging machine with incomplete cooling at the heat seal. If the contents are filled when the heat sealing part is not completely cooled, the heat sealing strength that the foam particles can bear is the hot tack of the material, rather than the traditional heat sealing strength of the material (tested after the heat sealing part is completely cooled). Technically, it is considered that the thermal viscosity of the material is the sum of the adhesion performance of the sealant material within the heat sealing temperature range and the adhesion strength of the sealant to other components of the multilayer structure. Its strength is much lower than the heat sealing strength after the heat sealing part is completely cooled (that is, the heat sealing strength of the material is usually tested). With the increase of the importance of the thermal viscosity index of materials, the thermal viscosity tester, which is specially used for the detection of thermal viscosity of materials, has gradually appeared in the packaging material detection market

at the same time, with the increase of the speed of the packaging production line, the inappropriate friction coefficient between the material and the traction roller and other parts in the bag making and printing process is also one of the reasons for the failure of the production line and the increase of the product scrap rate. Therefore, the friction coefficient of the material must be tested before the roll (especially the roll for automatic packaging) is put on the machine. Because the change of ambient temperature will affect the friction coefficient of the material surface, and in actual use, the production line will always produce a certain amount of heat during operation, causing a certain temperature rise in the interior, surface and nearby space of the equipment, the influence of temperature on the friction coefficient cannot be ignored. In the past, the testing of the friction properties of materials was only carried out at room temperature (23 ℃), and the test data has little guiding significance for the use of materials at high temperature. It is necessary to test the friction coefficient of coiled materials at the actual use temperature. To carry out the friction coefficient test in the heating environment, it is best if the detection equipment has the function of self-control temperature, so that the temperature of the test environment is not only uniform, but also more convenient to operate. For example, Labthink fpt-f1 can control the test temperature between room temperature and 99.9 ℃. Although this temperature rise test has not been supported by the corresponding standards, the customer's use and feedback are very good

4. Summary

China's packaging industry started late, so it was easy to obtain standard support in performance testing in the past, and we can use the experience of predecessors for reference to test directly. However, now the gap between China's packaging industry and the world's advanced level has narrowed, and most of the problems encountered in the actual production and use process and some indicators that help to improve the process cannot be studied. In order to meet these testing needs, the development and innovation of packaging testing is inevitable, and the drafting and revision of corresponding testing standards will be gradually improved after the testing technology is mature

source: Languang Laboratory

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