With the development of the economy, human beings have higher requirements for quality of life and more and more demand for dairy products. Therefore, many dairy manufacturers are constantly introducing new packaging to meet the demand, aseptic packaging, fresh-keeping packaging, and retort packaging. Square box, roof, soft plastic packaging, bottled and so on are endless. The soft packaging of dairy products has a greater proportion in the whole dairy packaging industry with its unique advantages, and the quality control problem of flexible packaging products is becoming more and more prominent. . The following is an introduction to the quality inspection technology for dairy soft packaging products.
First, the detection of composite strength of dairy soft packaging materials
Dairy soft packaging on the market, such as sterile pillows, sterile bricks are mostly composite plastic, composite paper. The higher the composite strength of the flexible packaging, the better, the tearing or breaking is ideal, and the high viscosity value prevents the composite layer from coming off. After the composite material is processed into a bag, it is exposed to harsh environments or affected by moisture and chemical components, and the composite layer is likely to cause damage. The use of high viscosity adhesives will undoubtedly achieve high quality compounding, but production costs will increase. It can achieve the required compounding and cost saving. This requires the detection and analysis of the quality of the composite layer in order to find the appropriate composite technical factors. At present, both domestic and imported tensile machines can be used for peeling tests, but they are all general-purpose, simple force calculations. Jinan Languang's PC-type intelligent electronic tensile testing machine is suitable for the test of small value in the flexible packaging industry. It fully complies with the GB8808-88 soft composite stripping test, the unique hoe-tailing function, and uses the integral method to find the middle part. Value; accurate result, real-time display of force value and curve, determine the use of adhesive according to the measured force value; understand the uniformity of the composite according to the fluctuation of the displayed curve; analyze the stability of the sample by curve superposition The situation; and accordingly adjust the production process, compound parameters.
Second, the detection of the friction coefficient of dairy soft packaging materials
The test of the friction coefficient of the packaging material can control and adjust the opening quality of the flexible packaging bag, the packaging speed of the packaging machine and other production quality process indicators. At present, domestic equipment has been in line with international standards, and has a unique oscillating coefficient setting to suit different materials of film and paper, intelligent data processing, effectively judge the confidence of the results of this group of samples, large-screen LCD real-time display curve, intuitive judgment The uniformity of the friction coefficient of the material surface. For manufacturers of packaging materials, the coefficient of friction is controlled by testing the type and amount of opening agent and slip agent in the resin. For the use of packaging materials manufacturers can effectively control the quality of raw materials.
Third, the venting and moisture permeability test of dairy soft packaging materials
The study of the breathability and moisture permeability of dairy packaging materials is especially important in the dairy industry, which directly affects the quality of the products. Internationally, such as the United States and the Danish company can measure this indicator, the price is about 450,000 yuan, and is a single-chamber operation, that is, one test at a time. At present, the gas permeability tester developed by Jinan Languang Co., Ltd. combines the most advanced technology, powerful software functions, real-time display of test data, computerized two-way automatic monitoring, simultaneous testing of three chambers, stable and reliable test accuracy, and automatic error correction. Check, suppress temperature drift, safe operation without mercury. The price is only around RMB 120,000.
Fourth, the detection of heat seal strength of dairy soft packaging seal
Heat sealing strength is an important performance index for packaging materials. For any kind of flexible packaging materials, packaging bags should be used to package various commodities, and packaging products should be heat sealed to seal the packaging. Sealing must have a certain strength to withstand the pressure of a certain weight of the contents, to ensure that the goods do not crack during the circulation. The three major factors of heat sealing are heat sealing temperature, pressure and time, depending on the material, different heat sealing factors are required. The PC type intelligent electronic tensile testing machine can perform this test, and the device automatically reads the data and automatically judges the force value. When Fn+1>Fn registers the Fn+1 value.
V. Sealing test of dairy packaging
The tightness of flexible packaging is also an important performance indicator, especially in the dairy packaging industry. Sealing has a great impact on the quality of the product. Poor sealing is the main cause of leakage and corruption in the future. There are many methods for sealing test. The most common method is to use the sealing tester and use the vacuum principle to maintain -30kpa, -50kpa, -70kpa, -90kpa for 0.5 minutes according to national standards. And the leakage of the sample during vacuum maintenance, observe whether there is continuous bubble generation, when the isolated bubble is not considered as leakage. The quality of the package is measured by the measurement of the sealing property, and the rationality of the sealing process is determined.
Sixth, other quality testing of dairy packaging
The ultimate goal of dairy packaging is to sell, and the beautifully printed packaging will undoubtedly attract consumers' attention and expand market share. The density, density difference, color, color difference, and overprint ratio of flexible packaging prints can be measured by the American X-Rite company's spectrodensitometer to control the quality of the printed crystal.
The analysis of the above-mentioned several flexible packaging test indicators is essential in the actual production to adjust the production process and improve the product quality. Through continuous testing, we can master the various production parameters to guide the production of dairy products.