The printing process of pp composite bag should not only pursue color vividness, but also take environmental protection into consideration, which requires comprehensive consideration from multiple aspects such as ink selection, printing equipment optimization, and process parameter adjustment.
In today's era of environmental protection, the printing of pp composite bag must not only meet the requirements of product packaging for color vividness to attract consumers' attention, but also meet environmental protection standards and reduce the impact on the environment. Therefore, achieving a balance between the two has become an urgent problem to be solved in the printing process.
Traditional inks may contain a large amount of volatile organic compounds (VOCs), which are harmful to the environment and human health. Environmentally friendly inks, such as water-based inks and UV inks, have the characteristics of low VOCs emissions or even no VOCs emissions. Water-based inks use water as a solvent, and the main volatilization during the drying process is water, which is environmentally friendly. At the same time, by improving the pigment formula and dispersion technology, water-based inks can also achieve higher color vividness. UV inks are instantly cured under ultraviolet light, and almost no VOCs emissions are generated. The cured ink has good gloss and color saturation, and can present bright colors.
Advanced printing equipment is essential to achieve a balance between color vividness and environmental protection. On the one hand, high-precision printing equipment can more accurately control the transfer and distribution of ink, making the color more uniform and delicate, thereby improving the color vividness. On the other hand, some new printing equipment is equipped with advanced drying systems and exhaust gas treatment devices. For example, the use of infrared drying or hot air circulation drying technology can speed up the drying speed of water-based inks and reduce the color deviation that may occur during the drying process. At the same time, the exhaust gas treatment device can purify the small amount of exhaust gas generated during the printing process to reduce the emission of VOCs.
Reasonable adjustment of printing process parameters is also the key to achieving a balance. In terms of printing pressure, the printing pressure should be accurately adjusted according to the material and thickness of the PP composite bag and the characteristics of the ink to ensure that the ink can be evenly transferred to the surface of the bag to avoid uneven color or excessive extrusion. The ink diffusion caused by excessive squeezing. In terms of printing speed, it should match the drying speed. If the printing speed is too fast, the ink will not have time to dry, and it is easy to cause smearing and color blurring; if the printing speed is too slow, it will affect production efficiency. For water-based inks, it is usually necessary to reduce the printing speed appropriately to ensure that it is fully dried, so as to present bright colors.
Color management is an important part of ensuring color vividness and consistency. By establishing a color standard system, the color in the printing process is accurately measured and controlled. Use professional color measuring instruments, such as spectrophotometers, to accurately measure the color of the ink and compare it with standard color samples. According to the measurement results, adjust the ink formula and printing parameters in time to ensure that the printed color is consistent with the design requirements while maintaining a high degree of vividness. In addition, a digital color management system can be used to digitally store and transmit color data to achieve color consistency of different batches of printed products.
During the printing process, it is necessary to strengthen quality inspection and control, and timely discover and solve problems in color vividness and environmental protection. Regularly sample and test the printed PP composite bag to check indicators such as color vividness, uniformity, and ink adhesion. At the same time, test the VOCs content of the ink to ensure that it meets environmental standards. For problems found in the test, timely analyze the causes and take corresponding measures to improve them, such as adjusting the ink formula, optimizing printing process parameters, or replacing printing equipment.
In the printing process of pp composite bag, achieving a balance between color vividness and environmental protection is a systematic project, which requires starting from multiple aspects such as ink selection, printing equipment optimization, process parameter adjustment, color management, quality inspection and control, etc. By comprehensively applying these methods, the requirements of pp composite bag packaging for color vividness can be met while minimizing the impact of the printing process on the environment, achieving a win-win situation of economic and environmental benefits.
