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The coating machine is mainly used for the production of surface coating processes such as thin films and paper. It is made by rolling a layer of adhesive, paint or ink with specific functions onto the substrate, drying it, and cutting it into pieces or winding it. It adopts a dedicated multifunctional coating head, which can achieve various forms of surface coating. The coating machine winding machine is equipped with a full speed automatic film connection mechanism, and PLC program tension closed-loop automatic control. The brush coating machine is the oldest coating equipment, originally used in the 1850s to produce coated wallpaper using Chinese clay coatings. There are three different types of brush heads: circular brush heads, rubber cloth roller heads, and rubber cloth cover heads. Figure 1 shows an early brush coating head. The emergence of air knife coating machines in the 1930s marked the birth of modern paper coating industry. The air knife coating machine has overcome the shortcomings of the brush coating machine and has been rapidly popularized, resulting in a sharp increase in the production of coated paper.
The coating machine needs to evenly apply glue or ink substances to the surface of aluminum foil, plastic film, or textile fabrics. The coating process requires high requirements, not only requiring uniform coating height, but also achieving high-speed and non-stop roller changing to improve production efficiency. The tension control at all levels is completed by frequency converters, and tension sensors are used to achieve tension control. The system is simple and stable. Use PLC or synchronous controller to control the speed of the drive roller frequency converter and use it as a linear speed signal for other frequency converters. The working principle of the screen printing plate automatic coating machine is the same, but its performance varies depending on the model and manufacturer. The silk screen coating machine is equipped with a device that can clamp the mesh frame onto the vertical frame. The front and rear of the screen area are horizontal coating mechanisms, consisting of a coating tank and a mechanical or pneumatic part that controls the angle and pressure of the coating tank. S350 closed-loop tension control (sensing vector control) easily achieves constant tension during acceleration and deceleration, saving installation space for tension rollers, reducing mechanical costs, and high-precision control to ensure highly uniform coating effect. The dual station unwinding and unwinding system has a pre drive function, which can meet the requirements of high-speed automatic unwinding and improve production efficiency. Meanwhile, precise rewinding control can avoid poor rewinding and improve the rewinding effect.
The working principle of the coating machine is to place the wrapped object in the center of the rotary table, start the rotary table motor to rotate, and naturally drive the rotary table to rotate, thereby achieving the winding of objects around the film winding machine. At the same time, the elevator motor also starts, driving the overall assembly of the winding and bundling machine to move up and down, achieving the height direction of the wrapped object and achieving the overall appearance of the wrapped object. This not only facilitates the packaging requirements for goods storage, transportation, and mechanized loading and unloading operations, but also prevents damage to the goods during transportation, plays a role in dust prevention, moisture-proof, and cleaning. It can also reduce production costs and improve production efficiency. During the winding process, the most important thing is to adjust the tension of the film and pass it through the film. Generally speaking,