The problem and solution of color fading in water-based ink printing on PET film
Date：2023-06-28 From：Star Color
Problem: Color fading in water-based ink printing on PET film can occur due to several factors. PET film has a smooth and non-porous surface, which can make it challenging for water-based inks to adhere properly. Additionally, exposure to external factors such as UV light, heat, or chemicals can cause the colorants in water-based inks to degrade or fade over time. This can result in a loss of vibrancy and clarity in the printed images or text.
Solution: To address the issue of color fading in water-based ink printing on PET film, the following solutions can be considered:
1.Pre-treatment of PET film: Prior to printing, a pre-treatment process can be applied to the PET film surface to improve ink adhesion. This can involve using corona treatment, plasma treatment, or primers specifically designed for enhancing ink adhesion on PET substrates. These treatments create a more receptive surface for the ink, allowing it to adhere better and reducing the chances of color fading.
2.Selection of high-quality inks: Choosing high-quality water-based inks formulated for PET film printing can make a significant difference in color durability. Look for inks that are specifically designed to be UV-resistant or have excellent lightfastness properties. These types of inks are more resistant to fading when exposed to external factors, providing better color longevity.
3.UV protective coatings: Applying a UV protective coating over the printed surface can help safeguard the colors from the detrimental effects of UV light. These coatings act as a barrier, blocking UV rays and preventing them from reaching the ink layer. UV protective coatings are available in various finishes, such as gloss or matte, and can provide an extra layer of protection against color fading.
4.Proper curing and drying: Ensure that the printed PET film goes through an appropriate curing and drying process. Inadequate drying or curing can lead to ink instability and reduced color fastness. Follow the manufacturer's recommendations for temperature, humidity, and curing time to ensure the ink sets properly and achieves optimal color durability.
5.Avoid exposure to harsh environments: PET film prints should be protected from exposure to harsh environments that could accelerate color fading. Limiting exposure to direct sunlight, extreme temperatures, excessive moisture, or chemical substances can help maintain the longevity of the colors. Consider storing or displaying the printed PET film in controlled environments, away from potential sources of degradation.
6.Regular quality checks and testing: Implement a quality control system to monitor color fading over time. Conduct periodic tests and evaluations to assess the color stability of the prints. This can help identify any issues early on and make adjustments in ink formulations, printing parameters, or protective measures as necessary.
