Many laboratory prawns are very familiar with the preparation and proofing of ultra-thin coating films. However, from the consultations of nearly a thousand customers from NBCHAO, we can still see that everyone has a cognitive bias for the coating machine used for coating. For example, some customers think that the film coating machine is used to control the film thickness, but it is not. The coating machine used in the laboratory is different from the coating machine used in the production line. It actually provides a platform to free your hands.
Under normal circumstances, accurate film production is often to meet the requirements of a certain test subject. This is very important. Errors cause scratches on the coating film, uneven film thickness, or the film thickness cannot achieve the predetermined effect. The test data of paint film performance cannot be said to be accurate, no matter how accurate the testing equipment behind you is. Therefore, the precise control of the coating film becomes extra important.
Controlling the accuracy of the coating film can be considered from two perspectives: one is the accuracy of the equipment used to prepare the film thickness , and the other is the repeatability of the environment of the film-making equipment . Let's break it down and say:
1. The accuracy of the equipment used to prepare the film thickness
Usually, several instruments and equipment are used to prepare the film thickness in the laboratory: Spray Gun, wire rod, and scraper. They each have their own characteristics and advantages. For example, the Spray Gun is easy to operate and can quickly spray multiple samples at the same time, but the thickness is relatively difficult to control; the wire rod adopts the Mayer principle, which can control the film thickness very accurately. μm, which is especially important for materials with high performance requirements; as for the scraper, although it cannot achieve a variety of film thickness specifications like wire rods, it has a feature that wire rods cannot, that is, the viscosity is particularly high. High or extremely volatile materials, this kind of material is easy to be difficult to level when scraped with a wire rod, which will eventually cause scratches and affect the quality of the entire film. In addition, in terms of accuracy, the scraper Applicator has very high requirements on the flatness of the substrate, which will have an adverse effect on the accuracy of the film thickness under certain circumstances.
Second, the repeatability of the membrane environment
The use of the above-mentioned film-coating equipment has a unified feature, that is, they all use "manpower". The speed of the Spray Gun and the distance will bring about the difference in the film thickness; although the scraping speed of the wire rod will not affect the film thickness, once the substrate is too soft, the pressure of the human hand may cause the tooth pattern of the wire rod to "depress" and paint. Film substrate, the actual coating film is smaller than the predetermined film thickness; the scraper Applicator is also not affected by the scraping film speed, but you can’t get around the flatness of the substrate mentioned above anyway.
Therefore, why the laboratory coater is getting more and more attention from laboratory personnel, because it provides a "constant speed" and "constant pressure" environment, and at the same time, considering that some materials require specific temperatures to adjust performance and The low-end heating function is provided, or the top heating function is provided for drying, and the vacuum adsorption function is used to solve the flatness problem when film coating, etc. These functions have solved the second problem of this article: the repeatability of film making.
So to sum up, it is not wrong for you to say that the laboratory coating machine is a device for controlling precise film thickness, but it is not enough. The combination of the wire rod and scraper Applicator on the laboratory coating machine can make the film more stable. Good preparation of precise film thickness.
