Grosimea filmului este un indice cheie de control în procesul de producție a acoperirii, inspectie si constructie. It directly affects the uniformity of coating, the performance of coating and the quality of coating. In this article, we will discuss the importance of coating thickness and the various measurement methods to ensure that the coating achieves the desired thickness requirements in different applications.

The importance of film thickness
În industria vopselelor, the control and measurement of film thickness is very important. The thickness of the coating directly affects the properties of the coating, such as corrosion resistance, wear resistance and weather resistance. Too thin a coating may not provide adequate protection, while too thick a coating may cause paint waste and performance issues. Controlling the film thickness ensures consistency and quality stability during the coating process. This is essential for paint manufacturers and the paint industry to avoid paint quality failures and paint quality issues. The measurement of film thickness helps to check the coating rate, acesta este, the amount of paint applied per unit area. This is essential for controlling paint costs and resource utilization. In some applications, the film thickness must meet specific design requirements. De exemplu, in the aerospace sector, the thickness of coatings may be limited by strict specifications and standards.

Metodă de determinare a grosimii peliculei de vopsea uscată și umedă

Method for determination of wet film thickness
The determination of wet film thickness is to check the coating rate during coating construction and ensure the total dry film thickness of the coating film after construction. The measurement of the wet film must be carried out immediately after the preparation of the film, so as not to cause the shrinkage of the film due to the evaporation of the volatile solvent. The following is an example of a commonly used wet film thickness measurement method:

Wheel gauge method:

The principle of this method is to use an instrument composed of three concentric wheels, in which the middle wheel and the outside two wheels are eccentric, with a height difference, and the outside of the wheel has a scale to indicate the reading of different gaps. The test operation involves holding the wheel shaft between thumb and forefinger to hold the wheel gauge, touching the maximum reading on the scale to the surface and pressing the concentric rim to the surface. The gauge is then rolled in one direction and picked up from the surface to read the maximum scale reading at which the edge of the eccentric can still be wet with paint. By calculating the arithmetic mean of these readings, the result of the wet film thickness can be obtained.

Method for determination of dry film thickness
Dry film thickness is measured to ensure that the coating reaches the desired thickness after drying. There are a variety of instruments and methods that can be used to determine dry film thickness, the following are some examples:

Metodă de determinare a grosimii peliculei de vopsea uscată și umedă

Non-destructive instrumentation:

This method includes magnetic measurement method, eddy current measurement method and beta ray backscattering method. Printre ei, the magnetic measurement method uses the magneto-resistance principle of electromagnetic field to measure the coating thickness by measuring the magnetic flux of the substrate. These methods usually express the result in μm.

Metodă de determinare a grosimii peliculei de vopsea uscată și umedă

Mechanical method:

Mechanical methods include lever micrometer method, indicator method and microscope method. Taking the microscope method as an example, the principle is to cut a V-shaped notch from the coating film to the bottom material, measure the width of the beveled edge, and get the paint film thickness in proportion. The specific operation is to select a tool at a certain Angle, the coating as a V-shaped notch to the substrate, and then the actual thickness of each coating can be read directly from the microscope with a ruler, the result is expressed in μm.

These methods allow the dry film thickness to be determined without damaging the paint, ensuring that the paint meets the design requirements after drying.

The measurement of film thickness is a key link in the coating industry, which is directly related to the performance and quality of the coating. By selecting the right measurement method and measuring according to the requirements of the specific application, it is possible to ensure that the film reaches the desired thickness and thus meets the design and performance criteria. Accurate measurement of film thickness is one of the key steps to ensure coating quality and performance in coating manufacturing and application.