Wet film thickness plays an important role in Coating and film detection, because the uniformity of the Coating film and good Spreader are one of the key factors to ensure the coating performance. Wet film thickness measurement is one of the key steps to ensure the coating mass. In the wet coating prepative process, the measurement of wet-film uniformity and thickness is crucial to the final performance of the Coating. This article will introduce the measurement tools and applicable methods of wet film thickness, including Thickness Wheel, Wet Film Comb.
Thickness Wheel
Scope and description
Thickness Wheel is a tool for wet film thickness measurement on laboratory test boards or freshly painted surfaces. It measures wet film thickness by gently rolling on wet-film surfaces to ensure coating uniformity and mass.
Instruments and Materials
The Thickness Wheel is composed of three coaxial wheels, the middle wheel is slightly smaller and eccentric, with a height difference. When the Thickness Wheel rolls on the wet-film surface, the edge of the middle wheel touches the wet-film surface, thereby reading the wet film thickness.
Determination method
When testing, the Thickness Wheel should be placed vertically on the wet-film surface to ensure maximum scale contact between the two outer wheels and the substrate.
The Thickness Wheel should roll 180 ° on the wet-film without shaking left and right. Then, observe and mark where the edge of the middle wheel first touches the wet-film surface.
Depending on the scale on the Thickness Wheel, read out the thickness of the wet-film. For representative results, multiple measurements can be made at different locations.
Result representation
The thickness of the wet-film is expressed in micrometers (μm) and multiple measurements are made at different locations to obtain representative results.
Reference standard
When performing wet film thickness measurement, you can refer to the national standard GB/T 13452.2 "Determination of Paints and varnishes Paint Film Thickness".
Wet Film Comb
Scope and description
Wet Film Comb is a tool for wet film thickness measurement in field painting operations. It provides a rough estimate of wet film thickness for Coating construction sites.
Instruments and Materials
Wet Film Comb is made of metal or plastic sheet with comb teeth. The outer teeth at both ends of the Wet Film Comb are on the same horizontal plane to form a Baseline, while the inner teeth in the middle have different gaps from the horizontal plane, corresponding to different wet film thickness values.
Determination method
During measurement, the Wet Film Comb vertically and firmly pressed against the wet-film surface, so that part of the teeth are wet Coating.
After removing the Wet Film Comb, check and determine the position of the shortest tooth in first contact with the wet-film surface and compare it to the position of the tooth that was not Coating wet.
The reading between the last tooth is not sticky wet teeth, recording the wet film thickness.
Result representation
The thickness of the wet-film is expressed in micrometers (μm) and multiple measurements are made at different locations to obtain representative results.
Reference standard
When performing wet film thickness measurement, you can refer to the national standard GB/T 13452.2 "Determination of Paints and varnishes Paint Film Thickness".
Accurate measurement of wet-film is essential to ensure the performance and mass of the coating. By using appropriate measurement tools and methods, the thickness of the wet-film can be effectively controlled, thus ensuring the performance and mass of the coating in different applications. Thickness Wheel and Wet Film Comb are common tools for wet film thickness measurement, and they can play a key role in Coating construction and quality control.
