What is CPC technology? C: Chamber P: Pressure C: Contorl refers to the technology of adding an additional scraper component to the internal chamber of the original closed scraper system, and controlling the printing/coating feeding through a flow channel design combined with a pressure sensor.
The sealing knife and metering scraper are both traditional enclosed scraper cavities. Our innovation lies in the integration of a secondary extrusion compensation (supply) scraper with a flow channel design in the inner cavity of the cavity scraper, which mainly plays two roles: isolating ink impact and allowing the ink to have secondary pressure to fill the mesh holes.
When it comes to fluids, it is necessary to rely on fluid analysis software, which can help us design the flow channels inside the cavity well and avoid laminar and turbulent phenomena caused by the fluctuation of the feed pump.
We collaborate with the development of fluid analysis software to assist in designing the flow channels of the cavity. Confirm the problem of fluid flow dead angles inside the cavity caused by unreasonable design positions of the feed and return ports through software analysis and simulation. In short, it is to simulate and restore the flow trajectory analysis of ink inside the chamber as much as possible. The auxiliary design of fluid analysis software greatly reduces the trial and error cost of research and development, and can provide customers with a mature and reliable solution.
The advantages of using CPC technology: Firstly, our cavity is designed with aviation grade aluminum titanium composite material diamond coating, which allows for quick blade replacement without the need for tools. With the application of heating and cooling systems, we can achieve functions such as double-sided printing and coating.
1. The cavity is filled with the least amount of medium, and multiple sensors are used for coordinated control. Explanation: Due to the addition of a compensating scraper mechanism inside the three scraper chambers, it occupies a portion of the space inside the chamber, thereby reducing the space filled with ink. The entire system is equipped with multiple precision pressure and flow sensors to control the pressure and flow of ink in real-time closed-loop linkage with the feeding pump. The entire process control has made a qualitative leap in material supply accuracy.
2. Due to changes in the speed of the ink supply pump, a single anilox roller can achieve a slightly different transfer amount (≤ 40%), thereby controlling the effective filling of the anilox roller mesh. The feed pump is controlled by a servo system in conjunction with a closed-loop sensor for on-demand supply, and the entire process will not produce excessive or insufficient supply. By inputting different parameters into the feeding control system, a small amount of ink transfer can be achieved. Traditional feeding is contact filling, and we now use pressurized replenishment. The pressure setting for different feeding transfer amounts also varies. Currently, the experimental data shows that the maximum difference can reach 40%.
3. A higher printing/coating speed of 500 m/min or higher is possible. The system will not experience slow operation due to insufficient ink filling of the mesh.
4. Because our chamber adopts a combination of feed pressure control and specially designed flow channels, CPC can minimize air retention as much as possible; Minimize ink filled bubbles, foam or micro foam (especially important for transparent and optical surface materials).
5. Under different operating speeds, the pressure supply of the CPC three scraper system combined with high-precision sensors can stably and effectively fill the mesh with ink. Constant coating weight during acceleration and reduction of operating speed; It can ensure high-precision printing transfer (≤ 3% dry).
The core advantage of the three scrapers is that they can eliminate and greatly reduce ghosting problems during the printing process. By combining the internal compensation scraper with pressure feeding, the problem of ghosting can be effectively avoided. There is no need to reduce the speed of the printing machine or excessive unexpected shutdowns caused by ghosting, which can ensure the printing speed of the machine. Adjusting ink viscosity and ink formula to minimize ghosting is a common practice, but it will only cause printing to deviate from agreed standards (signature samples), and changing ink properties may bring other uncontrollable problems to printing production. In addition, compared to the production capacity and labor required for replacing, stopping, and re signing the anilox roller caused by ghosting, the application of CPC technology does not require adjustments due to ghosting issues, greatly improving productivity.