Guizhou Wanhe Precision Electronics Co., Ltd. can provide large stroke, high stiffness pre stressing actuators for coating film thickness control in narrow slot coating equipment, ensuring faster response and higher precision coating film thickness.
Coating technology can be applied in multiple fields and scenarios, mainly including lithium battery electrode coating, fuel cell electrode coating, perovskite solar cells, thin film transistor coating, panel level fanout packaging, organic light-emitting diodes (OLEDs), etc.
The common coating methods can be mainly divided into scraper coating, roll coating, and extrusion coating. Compared to other coating methods, slit extrusion coating has many advantages, such as fast coating speed, high accuracy, and uniform wet thickness; The coating system is closed, which can prevent pollutants from entering during the coating process. The utilization rate of the slurry is high, and the properties of the slurry can be maintained stable. Multiple layers of coating can be carried out simultaneously. And it can adapt to different viscosity and solid content ranges of slurry, and has stronger adaptability compared to transfer coating process. It is also the main coating method currently used in the front-end stage of lithium batteries.
The slit extrusion coating technology has gradually developed with the development of modern electronics industry, mainly through slit extrusion for coating, which can obtain high-precision coatings. Slit extrusion coating refers to the process of a certain flow rate of slurry entering the internal cavity of the die from the feeding port of the extrusion head, and forming a stable pressure. The slurry * * * flows out uniformly at the slit outlet of the die and is coated on the substrate.
The overall performance of slit extrusion coating is excellent, but it requires high technical and equipment accuracy for the high-precision slit coating die of the core components. At present, the slit extrusion coating die mainly achieves the slit gap adjustment process through three methods: bolt adjustment, micrometer adjustment, or stepper motor adjustment. The method of adjusting the bolt to control the gap between the narrow slits may not be able to achieve rapid adjustment during the coating process due to bolt thread wear, deformation, jamming, and other reasons, making it impossible to * * control the gap between the narrow slits; And the bolt adjustment process heavily relies on the experience of the operator, and the adjustment has lag. The method of adjusting and controlling the gap between narrow slits using a micrometer also has the problem of relying on the experience of the operator during the adjustment process, and the adjustment has a lag effect; And due to the separate connection of each micrometer structure to an adjusting plate, there is a height difference between the adjusting plates, which leads to defects such as stripes and dark marks during the coating process, posing a risk of failure in surface density control. When using a stepper motor to control the gap between the narrow slits, the crawling phenomenon of the micro stepper motor during high-resolution control can lead to sudden stroke changes, which can easily cause defects such as stripes and dark marks during frequent adjustments in the coating process, affecting the consistency of surface density. The piezoelectric ceramic coating die adopts a piezoelectric ceramic control module * * * to control the discharge gap of the coating slurry, reducing the dependence on the operator's experience. The piezoelectric ceramic actuator end is directly pushed by the micro deformation superposition of the piezoelectric ceramic, controlled by the input voltage, with sensitive response and no problems of jamming or crawling. The overall structure of the adjustment plate has no joints or faults, forming a smooth and neat interface for the discharge gap of the coating slurry. The extruded coating slurry thickness is more uniform, which can effectively eliminate coating quality defects such as stripes and dark marks, and ensure the consistency of the surface density during the coating process.
Hidden crown can provide large stroke, high stiffness piezoelectric ceramic&control module, applied to control the discharge gap of narrow slot coating die, ensuring faster response and higher precision coating film thickness.
The stacked piezoelectric ceramic actuator adopts a structure of stacked piezoelectric ceramic sheets, which achieves the superposition output of multi-layer ceramic response displacement under electrical signal excitation, with a displacement of up to 180 μ m.
The company has a wide range of product specifications to match different die specifications. The company can provide a complete set of piezoelectric ceramic control modules, which can achieve convenient and flexible positioning, installation, replacement, disassembly, and maintenance. At the same time, the company integrates strain gauges to achieve closed-loop control based on specific customer needs and application scenarios, and configures self-developed and adapted drive controllers to achieve technological and cost advantages in product portfolio.
At present, the company has achieved mass production of piezoelectric ceramics and has completed market validation and stable and continuous supply in the fields of lithium battery electrode coating.
