How does the automatic painting line for thermos cups perform its automatic painting operation?
The thermos cup painting line is a core surface treatment equipment in the thermos cup production process. It is mainly used for standardized and refined spraying processing of thermos cup components such as cup bodies and lids. Through a series of standardized processes, it achieves paint film adhesion and curing, ultimately improving the appearance texture, wear resistance, scratch resistance and rust resistance of thermos cups. It is a key production link that determines the competitiveness of thermos cup products. With the transformation of the thermos cup industry towards scale, high quality and intelligence, automatic painting lines have gradually replaced traditional manual spraying, becoming the mainstream configuration in the industry and widely used in various thermos cup production enterprises and industrial clusters.
According to the degree of automation, thermos cup painting lines can be divided into fully automatic painting lines and semi-automatic painting lines. At present, the most widely used in the industry is the fully automatic painting line. Its core advantage lies in realizing standardized and unmanned operation throughout the whole process, which can effectively avoid the problems of low efficiency, obvious color difference and uneven paint film caused by manual spraying. At the same time, it improves paint utilization rate, reduces environmental pressure, and achieves dual improvement of production efficiency and product quality. The whole set of painting line is composed of feeding system, pre-treatment system, electrostatic dust removal system, automatic painting system, curing and drying system, cooling system, unloading inspection system and auxiliary recovery system, forming a full-process closed-loop control, which is suitable for the production needs of thermos cups of different specifications and styles.
The technological process of a mature thermos cup painting line is scientific, standardized and interlocking, and each link directly affects the final spraying effect. The specific process is as follows:
As the starting point of the process, the feeding link mainly uses a manipulator to accurately grasp the thermos cup body and lid, and stably hang them on the special ground rail chain line. It avoids direct manual contact throughout the whole process, prevents the generation of defects such as fingerprints and scratches, lays the foundation for the subsequent spraying process, and ensures the cleanliness of the spraying surface.
The pre-treatment process is the core key to ensuring the adhesion of the paint film and an important link to improve the rust resistance of the thermos cup. This link completely removes oil stains, dust, impurities and other substances on the surface of the cup body through a series of continuous processes such as degreasing and deoiling, multiple water washes, surface adjustment and ceramization. At the same time, it optimizes the surface activity of the cup body, enhances the bonding degree between the paint film and the cup body, and avoids problems such as peeling and blistering in subsequent spraying from the source. After the pre-treatment is completed, the thermos cup will enter the moisture drying oven and be dried at a constant temperature of 100-120℃ for 10-15 minutes to ensure that there is no moisture residue on the surface of the cup body, avoiding quality hazards such as shrinkage holes and bubbles after spraying.
Following closely is the electrostatic dust removal link. The high-voltage electrostatic dust removal gun is used to accurately blow the surface of the cup body, completely removing the fine dust that may remain during the pre-treatment and drying process, ensuring that the spraying surface is smooth and flat, preparing for the subsequent painting process, and avoiding problems such as particles and defects caused by dust mixing into the paint film.
The automatic painting link is the core of the entire production line. It adopts an automatic cup gun, which can achieve 360-degree dead-angle-free uniform spraying according to preset parameters. The process is divided into two steps: primer spraying and topcoat spraying. Primer spraying is mainly used to improve the adhesion of the paint film and evenly cover the surface of the cup body; after the primer spraying is completed, the thermos cup enters the normal temperature leveling area to allow the paint film to flow naturally and closely adhere to the cup body; then the topcoat spraying is started. According to the product design requirements, the thickness and color uniformity of the paint layer are accurately controlled. After the topcoat spraying, the leveling treatment is performed again to ensure that the paint film has no sagging, no particles, no color difference, and presents a full and uniform appearance texture.
After the painting is completed, the thermos cup enters the curing and drying link, and the paint film is completely cured through a tunnel-type curing oven. The curing temperature is controlled at 140-180℃, and the curing time is 20-30 minutes. Through constant temperature heating, the paint film forms a stable protective film, which greatly improves the wear resistance, scratch resistance and corrosion resistance of the paint film, ensuring that the thermos cup remains bright and not easy to fall off after long-term use.
After curing, the thermos cup enters the cooling area. The cup body is quickly cooled to normal temperature by combining natural air cooling and forced cooling, which not only avoids paint film damage and personnel scald caused by unloading at high temperature, but also improves the efficiency of subsequent inspection and packaging.
Finally, it enters the unloading and inspection link. The staff conducts a comprehensive inspection on each thermos cup, focusing on checking appearance problems such as color difference, particles, shrinkage holes and bottom exposure of the paint surface. At the same time, adhesion, hardness and other performance tests are carried out. Unqualified products will be reworked, and qualified products will enter the packaging link and eventually be put on the market.
In addition to the core technological process, the new generation of thermos cup painting lines is also equipped with an efficient powder recovery system. The paint utilization rate can reach 95%-98%, and the unadsorbed powder can be recycled, which not only reduces raw material consumption, but also reduces pollutant emissions, conforming to the development trend of green environmental protection in the industry. At the same time, the whole set of equipment can realize intelligent control through the PLC control system, real-time monitoring various parameters in the production process, facilitating enterprises to accurately control production quality and improve production efficiency.
At present, in thermos cup industrial clusters such as Yongkang and Wuyi in Zhejiang, thermos cup painting lines have become the standard configuration for enterprises. Their application not only promotes the intelligent transformation of the enterprise's production mode, but also helps China's thermos cup industry transform from scale expansion to quality improvement, further enhancing the competitiveness of China's thermos cup products in the global market. In the future, with the iteration of intelligent and green technologies, thermos cup painting lines will upgrade towards more efficient, accurate and environmentally friendly directions, adapting to the diversified and personalized production needs of the industry, and providing continuous support for the high-quality development of the thermos cup industry.
