In the process of manufacturing powder coatings, the function of the raw material pre-mixing equipment is to mix solid particles or powdered raw materials such as resin, curing agent, pigment, filler and auxiliary agent in the powder coating formulation uniformly, and then provide the next step for melt extrusion mixing Process use. 

Thermosetting Pre-mixer for powder coating

Therefore, this equipment is required to be able to uniformly mix and disperse solid particles or powdery materials in a short time, which can be used for powder coatings. There are many types of equipment for premixing raw materials, including cylindrical mixers, conical mixers, square mixers, double-cylinder V-shaped mixers, barrel mixers, mixing mixers, twin-screw mixers (horizontal ), screw mixer (vertical), ball mill, high-speed mixer, etc. These equipments can be divided into roller mixers, stirring mixers and high-speed mixers according to their functions.

The difference between thermosetting Pre-mixer for powder coating

Among the above equipment, cylindrical, conical, square, double-cylinder V-shaped, barrel-type and ball mill type mixers are roller type mixers, most of which have only mixing functions and no crushing functions. Only ball mills have mixing. With dual functions of crushing, the mixing time of these devices is 10-30 minutes.

The Pre-mixer for powder coating used in the production of powder coatings includes an improved three-dimensional rotating water-cooled mixer with a conical mixer, a double-cylinder V-shaped mixer and a barrel mixer. Most manufacturers using these equipment are used for the mixing of finished powder coatings or the manufacture of fine art powder coatings (including metal powder powder coatings), and a few manufacturers are used for the pre-mixing of raw materials. When the resin and auxiliary particles are too large, it is not suitable to premix the raw materials with a roller mixer. This is because this equipment has no crushing function. When the raw material contains resins with large particles, especially resins with high softening points and high melt viscosity such as polyester resins, it is too late to be crushed and melt dispersed during the melt extrusion process. Undispersed resin particles are prone to appear in the coating, and the coating film is prone to shrinkage.

High-speed mixer for thermosetting Pre-mixer for powder coating

The high-speed mixer is a device with both mixing and crushing functions. The general mixing time is 3 to 5 minutes. It is the most ideal raw material mixing equipment for powder coatings.

This equipment is generally equipped with two or three motors. The motor installed in the center of the mixing tank drives the stirring blade. The general speed is below 20〇r/min, which mainly plays a mixing role; the other or two motors are installed On the side of the mixing tank, the general rotation speed is 2900r/min, which drives the crushing hammer, which is mainly used for crushing. For the mixing tank with a capacity of more than 500L, install two motors. High-speed mixers for thermosetting powder coatings are generally not equipped with cooling devices. This type of mixing equipment has simple structure, no dead corners in the tank, and convenient cleaning, color change and paint changes. At present, most domestic manufacturers use this equipment for raw materials the mix of. In addition, some foreign-funded factories and some large powder manufacturers in China choose the automatic mixer as the hopper movable (tipping bucket) mixer.

The working principle of mobile mixing hopper

Domestic manufacturers such as Sanli Machinery and other manufacturers have such equipment. The working principle of this mobile mixing hopper is that after the hopper containing the raw materials to be mixed is pushed to the station, it is lifted by the automatic control system, combined with the mixing cover and locked tight. The hopper and the stirring cover are turned over together, and the mixing is carried out during the turning over. After the mixing process is completed, the hopper automatically returns to the original station. The entire working cycle is automatically controlled by a programmable controller (PLC). Uniform mixing, high production efficiency, no solidified particles.

Advanced technical characteristics of the inverted automatic mixer

The hopper is turned over and mechanically stirred at the same time; the continuous cycle operation of multiple hoppers is convenient for color change; the mixing is uniform and there is no solidified particles; the high productivity, electromechanical control of the positioning, lifting, clamping and loosening of the hopper; it is realized by the programmable logic controller (PLC) Automated; easy to clean and maintain.