How to solve the defects of blistering and shedding of the coating that are easy to occur during the process of pet gold-plated blister?
Publish Time: 2025-03-24
In the world of wedding candy packaging, pet gold-plated blister has become the darling of newlyweds with its dazzling appearance. However, under the bright and beautiful appearance, problems such as blistering and shedding of the coating are like a lingering nightmare, which troubles countless manufacturers. These defects not only affect the appearance of the product, but also reduce the protective performance of the packaging, and ultimately affect the consumer's experience.
The root cause of blistering and shedding of the coating is often hidden in every detail of the production process. From the surface treatment of the PET substrate to the control of the electroplating parameters, negligence in any link may lead to catastrophic consequences. The cleanliness of the substrate surface is the first checkpoint, and tiny oil or dust may become the enemy of the coating adhesion. In modern production, plasma treatment technology is gradually replacing traditional chemical cleaning methods. By bombarding the material surface with high-energy particles, it can not only thoroughly clean, but also activate the surface molecules, laying a solid foundation for the adhesion of the coating.
The formula of the electroplating solution is the soul of this process. Although the traditional cyanide plating solution has a stable effect, it is gradually replaced by cyanide-free plating solution due to environmental toxicity. The ratio of additives in the new environmentally friendly plating solution is particularly critical. The right amount of brightener can improve the density of the coating, while an excessive amount may increase the internal stress and increase the risk of blistering. Temperature control should not be ignored. If the temperature fluctuation of the plating solution exceeds ±2℃, the coating structure may change, which may cause quality risks.
Humidity control in the production environment is often overlooked, but it is a key factor affecting the quality of the coating. PET material has hygroscopic properties. Excessive environmental humidity will cause water molecules to be adsorbed on the surface of the substrate, forming microbubbles during the electroplating process, and eventually evolving into visible blistering of the coating. Although establishing a clean production environment with constant temperature and humidity increases costs, it is a necessary investment to ensure product quality.
The post-plating treatment link also hides mysteries. Improper drying temperature will cause stress between the coating and the substrate due to the difference in thermal expansion coefficients, which may affect the appearance at the least and cause the coating to peel off at the worst. The use of a gradient heating drying process can effectively alleviate this problem by allowing the material to adapt. The protective coating on the surface of the coating should not be underestimated. A thin layer of UV varnish can often significantly improve the wear resistance and scratch resistance of the coating.
The process of solving coating defects is actually a journey of continuously optimizing the entire production system. Introduce an online detection system to monitor the coating quality in real time through machine vision; establish a complete data traceability system so that each problem can be found at the root; cultivate the professional quality of technicians so that they can keenly discover and solve abnormalities in production. The comprehensive application of these measures can fundamentally improve the product yield.
With the continuous emergence of new materials and the continuous innovation of process technology, the coating quality problem of pet gold-plated blister will eventually be overcome. And every technological breakthrough will bring more brilliant light to wedding candy packaging and add more brilliance to the sweet moments of the newlyweds. This is not only an advancement in technology, but also a tribute to a better life.
