How to monitor the falling off of black and white film printing ink layer in liquid milk packaging

Absrtact: the peeling off of the ink layer of the liquid milk packaging printing will seriously affect the image of the product, and even affect the consumers' trust in the product quality And the combination fastness test of the ink layer of the package can effectively prevent the phenomenon that the printing ink layer falls off due to friction during the transportation of the product In this paper, Labthink blue light blj-02 disc peeling tester and ygj-02 adhesive tape roller tester are used to test the binding fastness of the ink layer on the surface of the black-and-white film packaging The test process, test principle, equipment parameters and other contents are described in detail, which provides a reference for the enterprise to test the printing effect of the packaging materials Key words: liquid milk, black and white film, surface printing, peeling off of ink layer, combination fastness of ink layer, disc peeling tester, adhesive tape roller press 1, meaning liquid milk black and white film packaging mostly adopts surface printing technology, that is, printing production date, shelf life, preservation method and other important information on the surface of product packaging The combination fastness of ink layer is the key index to characterize the printing effect of surface printing process, because the printing layer is usually exposed to the outside world and greatly affected by the external environment If the combination fastness of printing ink on the film surface is poor, the ink layer is easy to be worn out or fall off during the transportation, storage, sales and use of product packaging due to external friction and rubbing Reducing the image of the packaged products in the minds of consumers can also lead to the lack of important information of the products, and bring inconvenience to the purchase or use process of consumers Therefore, in order to improve the combination fastness of printing ink on the packaging surface and prevent the ink layer from abrasion and falling off, the enterprise should strengthen the detection of the combination fastness of the packaging material ink layer Fig 1 packaging of liquid emulsion black and white film 2 For the test basis of the combination fastness of ink layer, please refer to the relevant provisions in article 5.7 of the standard GB / T 7707-2008 intaglio decoration printing 3 Test sample black and white film of liquid milk provided by a dairy factory 4 In this paper, blj-02 disc peeling tester and ygj-02 adhesive tape roller tester independently developed and produced by Jinan Languang Electromechanical Technology Co., Ltd are used to test the binding fastness of the ink layer of the sample Figure 2 blj-02 disc peeling tester Figure 3 ygj-02 adhesive tape roller press 4.1 test principle The adhesive tape meeting the requirements shall be pasted on the ink printing surface of the sample The adhesive tape and the sample pasted together shall be rolled with the standard load, rolling times and rolling speed After a period of time, the sample and the adhesive tape shall be peeled under a certain pressure to check the falling off of the ink layer on the sample surface, so as to analyze the binding fastness of the sample printing layer 4.2 scope of application (1) the testing equipment mentioned in this paper can be used not only to test the ink layer binding fastness of plastic film printing, cellophane printing and other samples, but also to test the adhesion state of aluminum coating and coating layer of vacuum aluminum coating, coating film and other materials (2) the testing equipment involved in this paper complies with GB / T 7707, JIS c2107, JIS z0237 and other national and international standards 4.3 equipment parameters (1) the pressure between discs of blj-02 disc stripping tester is 100 N, and the stripping speed is 0.8 m / s The peeling angle and speed are designed in strict accordance with the national standards, effectively ensuring the reliability and universality of the test data Automatic alarm prompt after the test to ensure the safety of the user's operation The system is controlled by microcomputer, equipped with PVC operation panel and LCD, which is convenient for users to carry out test operation and data display quickly and conveniently (2) the rolling speed of ygj-02 adhesive tape roller press is 300 mm / min, the roller load is 20 N ± 0.5 n, and the rolling times are 3 times The quality of the press roll, the thickness and hardness of the attached rubber shall be designed in strict accordance with the national standards to effectively ensure the accuracy and universality of the test data 5 Test process (1) paste the adhesive tape on the printed surface to be tested (2) place the above samples on the belt roller press for 3 times and keep for 10 minutes (3) one end of the sample is clamped on disc a (disc with larger diameter), and the exposed tape is fixed on disc B (4) start the disc stripping tester, and open the tape at the speed of 0.8 m / s for disc a (5) remove the sample, cover the semi transparent millimeter grid paper on the tested part of the sample, and count the number of grids a 1 occupied by the ink layer and the number of grids a 2 occupied by the ink layer at the falling off position (6) calculate the binding fastness [a 1 / (a 1 + a 2)] 6 The results showed that the ink layer on the surface of the sample was peeling off, and the combination fastness of the ink layer was 95% 7 Conclusion Labthink blue light blj-02 disc peeling tester and ygj-02 adhesive tape roller press are used to test the ink layer binding fastness of printed products, and the test process is simple, the test results are accurate and reliable, which can truly reflect the ink layer binding fastness index value of black-and-white film packaging Labthink Languang has always been committed to providing professional packaging testing equipment and services for customers around the world It has solved various problems in packaging for tens of thousands of customers To learn about relevant equipment information and service content, you can log in Jinan Languang company to check or call Jinan Languang for consultation The more you understand, the more you trust! Jinan Languang Electromechanical Technology Co., Ltd is willing to take this opportunity to enhance technical exchanges and cooperation with enterprises and institutions in the industry.