Test method for adhesion of printing ink to the surface of packaging bags

Abstract: the adhesion fastness of the ink layer of soft plastic packaging with surface printing technology on the surface of the packaging bag is an important factor related to whether the printing handwriting and pattern are easy to fall off This paper introduces a test method to verify the quality of packaging and printing by testing the binding fastness of the ink layer on the surface of the packaging film of a quick-frozen product, and describes the test process, Labthink blue light blj-02 disc peeling test machine and ygj-02 adhesive tape roller press and other test equipment, so as to provide a reference for the enterprise to test the printing effect of packaging materials Key words: surface printing, soft plastic packaging, combination fastness of ink layer, disc peeling tester, adhesive tape roller press, single-layer film, ink layer peeling 1 Common soft plastic packaging bags include single-layer film and composite film Printing methods include surface printing and internal printing For single-layer film soft plastic packaging, the quality of printing is particularly important, because the printing layer of single-layer film is usually exposed to the outside, which is greatly affected by the external environment If the printing ink has poor binding fastness on the surface of the film, the ink layer is easy to be abraded or peeled off during the transportation and sales process of the finished product packaging due to external friction and rubbing Reduce the image of packaged products in the minds of consumers, and may lose important information such as production date, shelf life, storage methods, etc., which will bring inconvenience to consumers in the purchase or use process Therefore, it is an important measure to improve the combination fastness of printing ink on the packaging surface, and to strengthen the detection of the combination fastness of printing ink layer on the surface of film Figure 1 common soft plastic packaging for surface printing 2 The test basis for the combination fastness of ink layer can refer to the relevant provisions in article 5.7 of GB / T 7707-2008 intaglio decoration printing 3 The test sample is a single layer soft plastic packaging bag for quick frozen food packaging 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 Fig 2 blj-02 disc peeling tester Fig 3 test principle of ygj-02 adhesive tape roller press 4.1 The basic principle of this test is to stick the adhesive tape that meets the requirements on the ink printing surface of the sample, roll the adhesive tape and the sample pasted together with the standard load, rolling times and rolling speed, after a period of time, peel the sample and the adhesive tape under a certain pressure, check the falling off of the ink layer on the surface of the sample, so as to combine the printing layer of the sample Analyze the fastness 4.2 scope of application (1) the testing equipment involved in this paper can be used not only for the test of the ink layer binding fastness of plastic film printing, cellophane printing and other samples, but also for the test of 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 conforms to GB / T 7707, JIS c2107, JIS z0237 and other national and international standards 4.3 equipment parameter (1) blj-02 disc peeling tester, the pressure between discs is 100 N, and the peeling 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 part (6) Calculate the binding fastness [a 1 / (a 1 + a 2)] 6 The test results show that the ink layer of the sample has fallen off, and the combination fastness of the ink layer is 96% 7 Conclusion the combination fastness of ink layer is a physical index to indicate whether the ink layer is easy to fall off and an important performance index to evaluate the printing quality of printing products The combination of Labthink blue light blj-02 disc peeling tester and ygj-02 adhesive tape roller press can well test the ink layer combination fastness of printed matter, and the test process is simple, and the test results are accurate and reliable Labthink Languang has always been committed to providing professional packaging testing equipment and services for customers all over the world The packaging performance involved includes barrier, flexibility, impact resistance, puncture resistance, heat sealing performance, sealing performance, solvent residue, evaporation residue, etc for relevant equipment information and service content, you can visit Jinan Languang company or call directly 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.