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Date: Jun 19 2024 From: Star Color
UV ink is widely used in the printing industry due to its rapid curing, high durability, and environmental friendliness. However, poor adhesion of UV ink often becomes a tricky issue in the actual production process, affecting the quality and performance of the final product. What are the methods to improve the adhesion of UV ink?
I. Surface Treatment
Physical treatment: Physical surface treatment techniques such as corona treatment and plasma treatment can effectively increase the surface energy of the substrate and improve the adhesion of the ink. Corona treatment increases surface polarity through high-frequency and high-voltage discharge, while plasma treatment utilizes plasma to perform microscopic etching and activation on the surface, both significantly improving the adhesion effect of the ink.
Chemical treatment: Chemical treatment includes the use of primers or adhesion promoters. These chemical agents can change the chemical properties of the substrate surface, increase the affinity between the surface and the ink, and thus improve adhesion.
II. Ink Selection
Suitable ink: Selecting UV ink suitable for specific substrates is the key to improving adhesion. Different substrates (such as plastics, metals, glass, etc.) have different requirements for ink, and targeted ink formulations can significantly improve adhesion performance.
Special formulations: Using high-adhesion special UV ink formulations and adjusting the composition and additive ratio of the ink can effectively improve adhesion. Technical support and suggestions provided by suppliers are also critical references.
III. Substrate Cleaning
The cleanliness of the substrate surface before printing has a direct impact on the adhesion of the ink. The substrate surface should be free of grease, dust, and other impurities. Solvent cleaning, mechanical wiping, or ultrasonic cleaning methods can be used to ensure surface cleanliness.
IV. UV Lamp Adjustment
Light source intensity: The power and exposure time of the UV lamp must be properly adjusted to ensure complete curing of the ink. Insufficient UV light intensity can lead to incomplete curing and affect adhesion. Regularly replacing UV lamp tubes and maintaining stable UV light source output are important measures to maintain high adhesion.
Curing system setup: Check and adjust the settings of the UV curing system, including lamp position, curing speed, etc., to ensure sufficient curing energy and improve ink adhesion.
V. Environmental Control
The temperature and humidity of the printing environment have a significant impact on the adhesion of the ink. Printing operations should be avoided in high humidity or high-temperature environments, and the temperature and humidity should be controlled within an appropriate range to prevent adhesion loss caused by environmental factors.
VI. Pre-treatment Process
Appropriate pre-treatment of the substrate before printing, such as preheating or static elimination, can improve the adhesion effect of the ink. Preheating can reduce the moisture and static electricity on the substrate surface, while static elimination can avoid the negative impact of static electricity on ink adhesion.
By adopting the above methods, the adhesion of UV ink can be effectively improved, ensuring the quality and performance of printed products. In the actual production process, it is necessary to select appropriate treatment methods according to specific conditions and regularly check and adjust equipment and processes. If various methods have been tried but the problem remains unsolved, it is recommended to contact the ink supplier or professional technical support for further assistance. By continuously optimizing processes and technologies to improve the adhesion of UV ink, it will help enhance product quality and production efficiency.
Huizhou ZhongZhiXing Color Technology Co., Ltd. is a food grade water-based ink manufacturer specializing in the production of environmentally friendly inks such as flexographic printing ink, uv flexo ink,gravure printing ink, water-based varnish, etc
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