What is slit coating technology
DATE：2023/6/14 14:22:09 / READ： / SOURCE：This station
Narrow seam coating technology is a highly precise coating technology that uses extremely fine nozzles and high-precision coating systems to apply viscous liquids or paste like materials to specific positions in the product, thereby achieving high-precision, high-efficiency, and high-quality coating operations. This technology is suitable for different types of materials, such as glue, paint, ink, acidic liquids, etc., and has wide applications in various fields such as medicine, electronics, automobiles, and aviation.
The application range of slit coating technology is very wide, especially in the fields of electronics, medicine, and aviation. In the field of electronics, this technology is commonly used in high-tech fields such as coating insulation materials, patch adhesives, flat panel displays (LCD, OLED, QLED), touch screens, thin film solar cells (OPV, perovskite) hydrogen energy batteries, sensors, flexible and printed electronics, smart glass, etc; In the medical field, it is commonly used for coating biological materials, ointments, etc; In the aviation field, it is mainly applied in areas such as automotive paint coating and aircraft shell coating.
The main advantages of slit coating technology are: firstly, it has the ability to achieve high-precision coating, which can achieve a coating width of less than 0.01 millimeters; Secondly, the material utilization rate of slit coating is high, and a large amount of paint will not be wasted; In addition, since the coating process does not require contact with the surface of the object, it can effectively avoid waste and pollution; Once again, slit coating technology can improve the quality and efficiency of coating, reducing defects in coating; Finally, the coating solution has a high utilization rate and can be applied in three layers simultaneously.
Narrow seam coating technology also has some drawbacks, the most important of which is the limitation of equipment on materials, which can only apply relatively dense and low viscosity coatings, making it difficult to apply materials with different viscosities; The production cost of equipment is relatively high, requiring a large amount of capital and technical investment. High requirements for technical knowledge of operators; High installation and operation requirements; The precision of the coating head is high, and the maintenance cost is high.
The slit coating equipment mainly consists of a feeding unit, a coating unit, a nozzle, a control system, and a nozzle fixing device.
The feeding unit includes a storage tank, a conveying pump, a filtering device, etc.
The coating unit mainly consists of a valve system that controls the coating gap, a pressure control system, and a coating head.
Nozzles are usually made of stainless steel as the main material and can quickly and accurately spray liquid at specific locations.
The control system can accurately control the coating thickness and coating distance through computer and other control devices, and determine the spraying amount based on the required coating thickness.
The nozzle fixing device can stabilize the nozzle position and maintain the nozzle in the optimal position.
The process of slit coating is under pressure, where the coating liquid is extruded from the gap between the upper and lower molds, forming droplets between the moving substrate and transferring to the surface of the substrate, forming a wet film; The formation of liquid droplets is the key to film formation, and the key parameters of liquid droplets include the formation and position of the upper and lower meniscus, as well as the positions of static and dynamic contact lines
In summary, slit coating technology is a coating technology with high complexity but higher precision, suitable for many demanding fields and materials. Although the equipment cost is relatively high, due to its advantages of high precision and efficiency, the quality and work efficiency of the coating process will gradually be improved in future development.
The application range of slit coating technology is very wide, especially in the fields of electronics, medicine, and aviation. In the field of electronics, this technology is commonly used in high-tech fields such as coating insulation materials, patch adhesives, flat panel displays (LCD, OLED, QLED), touch screens, thin film solar cells (OPV, perovskite) hydrogen energy batteries, sensors, flexible and printed electronics, smart glass, etc; In the medical field, it is commonly used for coating biological materials, ointments, etc; In the aviation field, it is mainly applied in areas such as automotive paint coating and aircraft shell coating.
The main advantages of slit coating technology are: firstly, it has the ability to achieve high-precision coating, which can achieve a coating width of less than 0.01 millimeters; Secondly, the material utilization rate of slit coating is high, and a large amount of paint will not be wasted; In addition, since the coating process does not require contact with the surface of the object, it can effectively avoid waste and pollution; Once again, slit coating technology can improve the quality and efficiency of coating, reducing defects in coating; Finally, the coating solution has a high utilization rate and can be applied in three layers simultaneously.
Narrow seam coating technology also has some drawbacks, the most important of which is the limitation of equipment on materials, which can only apply relatively dense and low viscosity coatings, making it difficult to apply materials with different viscosities; The production cost of equipment is relatively high, requiring a large amount of capital and technical investment. High requirements for technical knowledge of operators; High installation and operation requirements; The precision of the coating head is high, and the maintenance cost is high.
The slit coating equipment mainly consists of a feeding unit, a coating unit, a nozzle, a control system, and a nozzle fixing device.
The feeding unit includes a storage tank, a conveying pump, a filtering device, etc.
The coating unit mainly consists of a valve system that controls the coating gap, a pressure control system, and a coating head.
Nozzles are usually made of stainless steel as the main material and can quickly and accurately spray liquid at specific locations.
The control system can accurately control the coating thickness and coating distance through computer and other control devices, and determine the spraying amount based on the required coating thickness.
The nozzle fixing device can stabilize the nozzle position and maintain the nozzle in the optimal position.
The process of slit coating is under pressure, where the coating liquid is extruded from the gap between the upper and lower molds, forming droplets between the moving substrate and transferring to the surface of the substrate, forming a wet film; The formation of liquid droplets is the key to film formation, and the key parameters of liquid droplets include the formation and position of the upper and lower meniscus, as well as the positions of static and dynamic contact lines
In summary, slit coating technology is a coating technology with high complexity but higher precision, suitable for many demanding fields and materials. Although the equipment cost is relatively high, due to its advantages of high precision and efficiency, the quality and work efficiency of the coating process will gradually be improved in future development.
Author：admin