Comprehensive Guide to Stainless Steel Water Bottle Surface Coating Processes (Paint Spraying Techniques Chapter)

"A cup holds stories, life carries warmth." Hello everyone, and welcome to "Dong Dong's Cup Talk" I’ve shared many topics related to water bottles, and today, I’d like to dive into the subject of surface coating processes for bottles. http://www.zhanyict.com/en/ProductsDetail-VB-10523.htmlTo explain this complex topic clearly and simply, I’ve invited Mr. Liao, the head of a professional coating company that has long collaborated with our factory. Drawing from his years of hands-on experience and management expertise in coating, he will share insights on the various surface coating techniques for stainless steel water bottles and their differences. The following content will be presented in Mr. Liao’s own words. Due to the depth of his sharing, I’ll break it down into separate articles for everyone.

As a coating engineer and corporate manager with 20 years of experience, I believe that paint spraying remains a critical process in the stainless steel water bottle industry. For manual spraying, I always instruct operators to maintain a constant distance of 30 cm and use a "Z"-shaped spray pattern. http://www.zhanyict.com/en/ProductsDetail-VB-10523.htmlHowever, automated production lines can achieve a film thickness precision of ±3μm—a level of consistency difficult to match manually.

For glossy finishes, I recommend a two-component polyurethane system paired with 30 minutes of curing at a constant 60°C, http://www.zhanyict.com/en/ProductsDetail-VB-10523.htmlwhich delivers a mirror-like reflectivity (gloss level ≥95 GU). One key consideration is preventing sagging on the curved base of the bottle, which can be addressed by adjusting viscosity (12-14 seconds in a #4 Ford cup) and implementing a staged heating process.

The key to matte finishes lies in the selection of matting agents. The compatibility of fumed silica (5μm particle size) with the resin directly affects the stability of the matte effect. I once resolved a batch color discrepancy issue for a Japanese brand, http://www.zhanyict.com/en/ProductsDetail-VB-10523.htmltracing it back to insufficient dispersion time of the matting agent, which caused sedimentation.

The innovation in soft-touch paints comes from silicone modification technology. By adding 10%-15% elastic resin, the coefficient of friction can be reduced to below 0.3. http://www.zhanyict.com/en/ProductsDetail-VB-10523.htmlHowever, spray thickness must be strictly controlled between 15-20μm. Exceeding this range can lead to tackiness and compromise dishwasher test performance.

I’m grateful for Dong Dong’s trust and honored by the invitation to share my experience. In upcoming articles, I’ll cover powder coating, PVD, electroplating, and more.

There are stories in the cup, and life has warmth. Choose a good factory to sell good water cups. We provide global OEM services for patented products and provide global OEM services with professional teams and high quality standards. Dongguan Zhan Yi Commodity Technology Co.,Ltd. specializes in high-quality cup and kettle products. We are willing to serve you wholeheartedly.