Definition
The wire rod scraper heated coating machine is a kind of experimental equipment used to prepare uniform coatings on the surface of substrates. It controls the coating temperature through the heating system and uses a wire rod scraper to coat the coating or paste on the substrate at a preset thickness, which is widely used in sample preparation and performance testing in the fields of coatings, inks, adhesives, electronic materials and new energy.
Principle
The device works on the principle of mechanical scraping combined with thermal control. The wire rod scraper is constructed of tightly wound stainless steel wire, and the winding gap determines the thickness of the wet film. As the scraper scrapes over the paint on the surface of the substrate at a constant speed, excess paint is scraped off, creating a uniform wet film. At the same time, the substrate is heated by a built-in heating plate or infrared heating system to adjust the paint flow, volatilization rate, or curing process. The coating thickness can be obtained by formulah = D × C / 1000Estimation, where h is the thickness of the wet film (microns), D is the diameter of the wire rod (mm), and C is the winding gap coefficient of the wire rod.
Measurement method
The evaluation of coating quality often involves thickness, uniformity, and apparent inspection. The thickness of the wet film can be directly estimated by the specification of the wire rod, and the thickness of the dry film needs to be measured with a thickness gauge. Uniformity The surface topography of the coating can be observed by optical microscope or surface profiler. In addition, the coating operation can be carried out according to standards such as ASTM D823 or ISO 2808, and after curing under constant temperature and humidity conditions, the coating can be tested for adhesion, gloss, or electrical properties.
Influencing factors
The quality of the coating film is affected by various factors. The coating speed affects the uniformity of the wet film, and too fast speed may lead to streaks, and too slow can easily cause sagging. The heating temperature needs to be adjusted according to the properties of the coating, too high a temperature may cause premature curing, and too low a low temperature will affect the leveling. When ambient humidity is high, the volatilization rate of solvents changes, which can lead to coating defects. The cleanliness and wear of the wire rod can also directly affect the thickness of the coating. The surface flatness and cleanliness of the substrate are the basic conditions to ensure the consistency of the coating.
Application:
This equipment has a wide range of uses in industrial R&D and quality control. In the coatings industry, it is used to prepare test coatings to assess weather resistance or hardness. In the field of printed electronics, it is used to coat conductive inks to prepare flexible circuits. In battery manufacturing, it can be used for coating tests of electrode slurries. In textile processing, assist in the development of functional coated fabrics. In addition, it is also used in sample preparation in optical film and adhesive testing.
Selection
When choosing a wire rod scraper heated film coating machine, there are several parameters to consider. The heating temperature range should cover the curing or drying temperature of the desired coating material. The coating width should match the size of the commonly used substrate. The wire rod scraper series should be available in a variety of specifications to suit different thickness needs. The stability of the equipment and the accuracy of temperature control affect the reproducibility of the experiment. Some models are equipped with adjustable scraping speed and pressure control to accommodate high-viscosity materials. Additionally, the easy-to-clean and maintenance design helps to extend the lifespan of the equipment.