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Precision coating process and equipment
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1. Dip coating (dipped pull method)Process and equipment
dipping pull methodis to immerse the substrate vertically into the coating solution(Sol) is dipped in, and then the substrate is pulled up vertically from the solution at low speed, and the attached liquid film is gelled in the air (gas phase).
1) The substrate is immersed vertically in the coating solution (sol).
2) using the interaction between the viscosity, surface tension and gravity of the coating solution to start pulling, the pulling process must ensure that the liquid surface without vibration, and the substrate vertical, uniform, smooth, continuous rise, so as to ensure the formation of a continuous and uniform film on the surface of the substrate.
3) The relationship between the pulling speed of the substrate and the viscosity of the coating solution and the gravity of the attached liquid flowing downward controls the thickness of the coating.
4) Form a uniform film and complete the transition from "wet gel film" to "dry gel film." The "xerogel film" is further dried and heat treated at high temperature to obtain the desired nano thin film material.
2. Micro-concave coating process and equipment
The development of the dimple roll coating approach is based on the increasing market demand for uniform coating of thin layers. This new coating method has simple mechanism, good process repeatability and reliability.
The concave roller coating adopts the kiss coating method, while the ordinary gravure coating basically has the back roller. The function of the back roller is to make the substrate contact with the gravure roller better and make the coating liquid transfer more. However, due to the pressure generated by the back roller, when the pressure is not right, the substrate is prone to problems such as wrinkles, resulting in uneven coating. Micro gravure coating uses kiss coating, and some potential problems are gone.
-Application of Micro-Concave Roller-
1. Optical film: optical film covers a wide range, and there are many cases of applying dimpled rollers. 2. Coating of lithium battery separator and pole piece: φ50mm dimpled rollers were mainly used in the early stage, and φ80-100mm dimpled rollers are commonly used at present.
2. release film: release film, especially the optical level of release film, the main application of φ50mm micro concave roller.
3. Other industries: ITO, anodized aluminum and other industries have a small number of applications of micro concave roller case.
3. Slit coating process and equipment
Example of a slit die coater
"Die coating" is a coating technology using plastic film extrusion molding technology. By passing the coating liquid through the "mold", a uniform liquid film is produced, and then the liquid film is contacted with the substrate for coating. In this way, the coating liquid sealed in the container is supplied to the "mold" by pressure, so that the coating liquid is not affected by the air, and stable coating can be realized.
As a representative mold coating machine.The "slit die coater" uses a die designed to evenly distribute the coating liquid in the transverse direction, and smoothes the coating film by creating a fault between the top of the die called "die lip" and the support roller.
In recent years, with the simultaneous coating of multiple layers.Clothof"Multi-layer slit mold" and other devices of high-level development, efficient coating.Clothbecame possible.
4. Ultrasonic spraying process and equipment
The nozzle tip of the ultrasonic spraying method is provided."Atomizing sheet (atomizing surface)". With the vibration of the ultrasonic wave, the coating liquid will be wiped out on the atomizing sheet and begin to form fluctuations. Subsequently, the output power of the ultrasonic wave is increased to a degree exceeding the surface tension, and mist-like droplets are formed and scattered.
Since the droplets formed are fine and uniform, they are suitable for local uniform coating. There is an advantage in that the material loss can be minimized since the bounce of the droplets and the unnecessary splashing hardly occur.
According to different purposes, can choose a variety of length, size, shape of the nozzle. By setting the necessary flow rate and vibration frequency, uniform droplets are sprayed, and the coating film thickness and film quality can be controlled.
Specific uses include hard coating and anti reflection, water/Oil barrier coating, insulating film and conductive film of electronic components, photoresist of semiconductor, etc.
Can spray dry film for nano-level thickness of the coating, the accuracy can reach±5%。
5. Spin coating process and equipment
A "spin coater" is a coating apparatus that utilizes a rotational centrifugal force, and is also referred to as a "spin coater". A thin and uniform coating layer can be formed for a smooth object to be coated (workpiece). Spin coater has a wide range of uses, representative uses include semiconductor wafer surface treatment, photoresist coating and other process processes, as well as optical media coating, lens primer and dimming liquid coating.
The coating liquid is dropped on the center of the object to be coated (workpiece) and rotated at high speed. Accelerated rotation applies a centrifugal force to the coating liquid, causing the coating liquid to spread over the entire surface and form a film. The coating thickness depends on the viscosity of the coating liquid, The rotational speed of the coated object, the rotation start acceleration, and the exhaust related to the drying speed.
The principle of spin coating is to spin the excess coating liquid away from the coated object by rotating centrifugal force, so the actual amount of film-forming liquid is less than the amount of dripping liquid, which has the disadvantage of causing material loss.
In order to control the drying speed through exhaust, prevent the coating liquid from splashing to the outside of the equipment, and avoid the mixing of foreign matter, the rotating body and the dripping mechanism are usually stored in the box, or the design style of closing the upper cover during coating is adopted.
The basic principle of the equipment has not changed in recent decades, but it is suitable for devices of different sizes, weights and materials to be coated, and specifications and functions such as speed (speed) control and automatic dripping have all achieved more diversified development.
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