What are the advantages of a slit coating machine and the coating process? Today, the coating manufacturer will tell you:
The slit coater uses a high-precision coating method of predicted amount, which is not only used for the coating of rolled substrates such as machine solar cell OPV and perovskite solar cell PVK, but also for the coating of polyimide slurry formula developed in the laboratory, OLED coating, optical film (brightening film, hardcoat, polarizing film, diffusion film, etc.) and other coatings, as well as for the photoresist coating of discontinuous substrates such as LCD glass substrate.
Slit coating involves precise movement of the coating die head relative to the substrate. By controlling the rate, precise metering, and pumping process fluid, liquid chemical materials are extruded from the gaps between the upper and lower molds to be coated on the moving substrate (glass, stainless steel, plastic, etc.) to form a thin film. The thickness of the coating film can be directly calculated from the liquid flow rate and the substrate movement speed. Its advantages include high uniformity of the coating film, wide range of applicable coating viscosity, fast coating speed, closed coating system, ability to prevent pollutants from entering during the coating process, and the ability to produce a large area of coating film.
Advantages of slit coating machines:
1. Good coating effect, imported coating blade, designed for high consistency, chemical compatibility, low filling capacity, and strip coating. The smoothness and uniformity of the coating can reach ± 5%.
2. High control accuracy, high-precision digital control of coating rate (steady-state coating) and coating contour (front and rear edges), which can achieve a film thickness of 500nm~50um.
3. The coating area is large and supports an effective coating width of 100mm~500mm.
4. Expected quantity tool, which can calculate process parameters in the early stage and reduce solution waste. The material utilization rate can reach 95%
5. Can meet the needs of different stages: from research and development (experimental) to pilot and mass production
6. Highly customizable, supporting larger coating area customization, multiple specifications such as air knife, vacuum adsorption, heating table, double head liquid injection pump, etc., supporting high viscosity materials.
The coating process of the slit coating machine:
Coating gap control: high-precision, dynamic control of coating head height
Mold motion control: Accurately control the motion trajectory of the mold in the coating direction (including acceleration and deceleration parameters)
Mold design: Design and manufacture molds for high consistency, chemical compatibility, low filling capacity, and strip coating
Coating control: high-precision digital control of coating rate (steady-state coating) and coating contour (front and rear edges)
Control software: All recipe parameters, data monitoring and feedback control, data collection and analysis.