At present, dairy products have played an important role in people's lives as daily consumer goods. With the improvement of the quality of life, consumers are increasingly demanding product packaging. In order to meet the needs of consumers, many dairy manufacturers are constantly updating their dairy packaging to meet their needs while introducing new products. Nowadays, aseptic dairy packaging, fresh-keeping dairy packaging, retort-resistant dairy packaging, and square box, roof, soft plastic packaging, and bottled products are emerging one after another. The soft packaging of dairy products has an increasing proportion in the whole packaging industry with its unique advantages. . For dairy manufacturers, the quality of flexible packaging is especially important. The following is an introduction to the quality inspection and analysis technology of dairy soft packaging products released by Jinan Languang ().
I. Detection and analysis of composite strength of dairy soft packaging materials
The dairy soft packaging on the market, such as sterile pillows, and the sterile bricks are mostly composite plastic and composite paper. The higher the composite strength, the better, the tear resistance or the destructive property is optimal, and the high viscosity and the value prevent the composite layer from being detached. 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 not only achieve the required compounding, but also save costs. This requires the detection and analysis of the quality of the composite layer in order to find the appropriate composite technical indicators. At present, there are peeling tests for both domestic and imported tensile machines, but they are all general-purpose, simple force calculations. Labthink's PC-type intelligent electronic tensile testing machine is used in the flexible packaging industry test. It conforms to the GB 8808-88 soft composite stripping test, and has a unique tail-tailing function. The intermediate section uses the integral method to find the force value; the result is accurate. Display the force value and curve in real time, determine the use of the 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 the curve superposition; This adjusts the production process and compound parameters.
Second, the detection and analysis 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, the equipment manufactured in China has been in line with the 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, Visually determine the uniformity of the surface friction coefficient of the material. 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. At present, Labthink's MXD-02 machine has a number of standard testing functions, in line with GB10006, ASTM D1894, ISO8295 and other standards, suitable for the friction coefficient test of dairy packaging, which satisfies the requirements of different standards in the testing of enterprises. The problem that comes with it.
Third, the detection and analysis of the permeability and moisture permeability of dairy soft packaging materials
The venting and moisture permeability of dairy packaging materials directly affect the quality of the product. Internationally, such as the United States Membrane, Danish PBI, Labthink Languang's PERME OX2/230 oxygen transmission rate test system can measure this indicator. Labthink's PERME OX2/230 oxygen transmission rate test system uses the Coulomb principle to test the oxygen permeability of dairy flexible packaging films, sheet materials and dairy bottles, bags, cans, boxes and other packaging containers. The instrument has advanced functions and precision to the international advanced level. It adopts host and satellite mode. One host can connect nine satellites, which can simultaneously test 30 samples, greatly improving the efficiency of testing.
4. Detection and analysis of heat seal strength of dairy soft packaging seals
Heat seal strength is an important performance indicator for packaging materials. Any kind of flexible packaging material should be made into a packaging bag to package various commodities, and the packaging materials should be sealed by heat sealing. The seal of the dairy package needs to have a certain strength to withstand a certain weight of the contents, to ensure that the goods do not crack during the circulation. The PC-type intelligent electronic tensile testing machine produced by Lathink can complete this professional test, and the instrument has the characteristics of automatically reading data, automatically judging the force value, and superimposing the data on the same group of samples. In addition, the sealing strength of the laboratory (also known as the heat sealing strength test) is also required to prepare the heat seal sample by means of a heat seal tester.
V. Analysis of the 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.
The above method adopts the principle of visual inspection and is a qualitative test method. If you want to quantitatively test the sealing and leakage performance of the package, you can use the positive pressure method to seal the performance test equipment, such as Labthink LSSD-01 leakage and sealing. The strength tester performs quantitative testing.
Sixth, other quality inspection analysis of dairy packaging
The ultimate goal of dairy packaging is to promote sales. The beautifully printed dairy packaging will undoubtedly attract consumers' attention and expand market share. Density, density difference, color, color difference, overprint ratio of dairy packaged prints, printing contrast can be measured by American X-Rite company optical densitometer; and ink layer bonding fastness or printing ink wear resistance for dairy packaging printing The detection can be carried out by using Labthink's MCJ-01A friction tester and BLJ-02 disc peeling tester to achieve the purpose of controlling print printing and color quality control.
The above analysis of the detection indexes of dairy soft packaging 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 packaging. Jinan Languang Electromechanical Technology Co., Ltd. currently has 5 advanced professional laboratories to provide customers with the best and most comprehensive quality control solutions.