Automatic coating production line

Project background
Under the general trend of growing demand in the global coatings market, Russia, as a large country with a vast territory, continues to increase the production demand for high-quality coatings. As one of the paint suppliers for the Sochi Olympic Games, the customer has a long reputation in Russia and has rich experience in the use of European equipment. In order to dispel customer concerns about Chinese equipment, SIEHE organized a field test of tonnage equipment, and finally signed this fully automated solvent-based coating production line. This production line is designed to help customers improve coating production efficiency, ensure product quality, and help them respond efficiently to market demand.

Project overview
Customer: Krascom
Location: Russia
Raw materials: resin, solvent, 8 kinds of powder, 6 kinds of color powder
System capacity: 10000T/ year
Floor area: 500 square meters

Process flow
At the beginning of the project, SIEHE understood the customer's specific requirements for the coating production line in detail, and according to its production process, the technical team of SIEHE reasonably planned the key links of raw material storage and batching, inline dispersing and mixing, filtering, filling, solvent recovery. The entire production line consists of seven sub-systems, which are divided into three working areas built by carbon steel platforms:

1）Liquid storage and batching system
The liquid batching system mainly includes solvent storage and batching, resin storage and batching. Using pumping and weight measurement for batching, pneumatic barrel pump from 200L raw material barrels or IBC barrels to transport solvents and resins to the corresponding raw material storage tank, which are equipped with weighing systems. According to the product process formula requirements, solvents, resins, and other liquids are automatically quantitatively pumped from the storage tanks to the mixing tanks.

2）Powder storage and batching system
The powder batching system is an independent platform, with a total of 8 types of powder materials such as titanium dioxide, calcium carbonate, barite, and fillers stored in their respective silos. The 8 silos are arranged in a circular pattern to save space as much as possible. The bottom of the silos is equipped with a de-arching device, which can reduce material accumulation.
Each silo is connected with a vacuum feeder equipped with a filter, reverse-blowing device and pneumatic discharge device, which is linked to 8 small bag feeding stations for powder feeding. The powder is conveyed by screw conveyor to the batching silo. The screw conveyor is controlled by a frequency converter to adjust the conveying speed and improve the accuracy. The tracking compensation reduces the batching error. The batching silo is equipped with a Mettler-Toledo explosion-proof weighing module, ensuring high batching accuracy. It is equipped with a number of movable intermediate silos to transfer the prepared powder to the production area and complete the dispersion pulping process in conjunction with the TDS inline disperser.
Under the platform is the toner feeding system, a total of 6 toners, each toner corresponds to a small bag feeding station, a vacuum feeder and a moving bin. No dust leakage, through the pre-weighing to complete the color powder feeding.

3）TDS Inline dispersing system
TDS Inline High-speed Disperser is a new generation of dispersing pulping equipment, technology originated in Germany, different from the traditional dispersing machine, its specially designed high-speed dispersing module in high-speed rotation, drives the liquid flows at a high speed and generates utmost vacuum. Suck the powders into the working chamber with vacuum, at same time, the clearance between powder particles will be enlarged and movement speed will be increased sharply. The dispersing energy, generated by the dispersing module rotating at high speed, enlarges the liquid surface area by a million times. So all powders are sucked and dispersed into the liquid completely and rapidly, and produce slurry without any agglomeration. It has the characteristics of large applicable viscosity, high dispersion efficiency, good homogenization effect, etc., and realizes closed operation, no dust overflow and powder loss.

4）Mixing system
This system is equipped with 10 mixing tanks on a steel structure platform, all of which are double tanks with cooling jackets and temperature sensors on the bottom of the tank for precise temperature measurement and control. The discharge port of the TDS inline disperser is connected to the mixing tank to further homogenize and refine the dispersed slurry to form a high-quality paint.
The outlet of each mixing tank is connected with a three-way valve, which can be connected to the filling equipment for filling, and can also transport the cleaning liquid of the tank to the solvent recovery system.

5）Filtering & filling system
The bag filter will filter the impurities of the finished coating and improve the quality of the product. The weighing type semi-automatic filling machine is used to fill the finished product, and the filter is fixed in the front end of the filling machine. 10 filling machines are connected to 10 mixing tanks, which can carry 5-25kg plastic drums, filling speed: 120-200 cans/hour.

6）Solvent recovery system
The system uses solvents as cleaning fluids and generates a large amount of waste liquid disposal costs annually. SIEHE tailored the solvent recovery system for this customer, using the way of distillation to extract the solvent in the waste liquid, and then through the condenser, so that the solvent becomes available again, to achieve the purpose of reuse, with environmental protection, sustainability, cost saving, improve economic benefits and other advantages.

7）Control system
Because the solvent has flammable and explosive characteristics, every production link should pay attention to explosion-proof. The whole production line is divided into danger zone and safety zone, and all equipment in the danger zone adopts explosion-proof control screen to ensure production safety; The stand-alone MCC control cabinet is located in a secure area and uses Siemens PLC control system and Schneider low-voltage components. The main control room screen displays the production process, realizing the automatic operation and remote monitoring of the production line.

Conclusion
The successful implementation of this project not only improves the production efficiency and market competitiveness of the customer, but also further strengthens SIEHE's leading position in the field of international coating production equipment. We look forward to working with more global customers to explore the vibrant development of the coatings industry.