Paint film sanding refers to the use of Abrasive materials such as sandpaper or pumice to grind the paint film or putty layer in painting projects to obtain a smooth and matte surface. This article will discuss in depth the importance of paint film sanding, different sanding methods and methods for measuring sanding.
In decoration and maintenance projects, paint film sanding is a key performance indicator that cannot be ignored. Whether it is to look good, improve the adhesion of coatings or prolong the life of paintings, certain paint film sanding standards need to be met. In this article, we will delve into the definition of paint film sanding, two different sanding methods, manual and instrumental, and how to measure the sanding performance of paint films.
Definition of film sanding
Painting film sanding refers to the difficulty of grinding the paint film or putty layer by using Abrasive materials such as sandpaper or pumice to obtain a smooth and matte surface in painting projects. This performance indicator is crucial for painting projects, especially in primer and putty applications. A good paint film sanding performance can ensure the smoothness and conformity of the paint film surface, thereby improving the aesthetics and adhesion of the coating.
Manual method
The manual method is a common method of sanding paint films. It usually uses water sandpaper and can be dry grinding or wet grinding with water. In the manual method, the operator needs to rub the surface of the paint film evenly to ensure that the paint film does not appear too hard or too soft. In addition, avoid heating, sticking sandpaper or causing local damage to the paint film. The advantage of the manual method lies in its flexibility and applicability. It can be used for sanding of various painting surfaces, but it also requires skilled operating skills.
Instrument method
The instrumental method is a more accurate method for measuring the sanding properties of paint films, which operates in accordance with the provisions of GB/T 1770-2008. In the instrumental method, the template is fixed on a suction cup, and a specified type of water sandpaper or emery cloth is installed on the grinding head of the instrument. According to the different needs of the film, weight can be added and placed on the sanding head to adjust the pressure of the sanding. Then, count through a counter to select the friction speed and the number of pre-rubbing. After reaching the predetermined number of times, remove the test plate and visually observe it under scattered sunlight, and evaluate the results with two of the three samples with similar phenomena. The advantage of the instrumental method lies in its accuracy and repeatability, which is suitable for applications with higher requirements on the sanding performance of paint films.
Determination of sanding property of paint film
The measurement method of the sanding property of the paint film can be selected according to specific needs, and can usually be evaluated according to the phenomenon of the surface of the sample film after sanding, the weight loss or the degree of adhesion of the abrasive on the sandpaper. The following are some common measurement methods:
Visual observation method: visually observe the sanding surface of the paint film to assess whether it is smooth and whether there are unfinely ground pigment particles or Miscellaneous impurities. This method is simple and easy to implement, but may not be accurate enough.
Weight loss method: By comparing the weight loss of the film before and after sanding, the difficulty of sanding is evaluated. The smaller the weight loss, the better the sanding of the paint film.
Sandpaper adhesion method: Evaluate the degree of abrasive adhesion to the sandpaper after sanding, which can also reflect the sanding performance of the paint film. The less adhesives, the better the sanding performance of the paint film.
Painting film sanding is an indispensable performance index in painting engineering, which directly affects the mass and aesthetics of coatings. This paper discusses in depth the definition of paint film sanding, two different sanding methods, manual method and instrumental method, and how to measure the sanding performance of paint film. Whether it is manual method or instrumental method, skilled operation skills and precise measurement methods are required to ensure the smoothness and conformity of the surface of the paint film. By correctly evaluating the sanding property of the paint film, the mass of the painting project can be ensured, the adhesion of the coating can be improved, and the life of the painting can be prolonged, so as to achieve better decoration effect and maintenance effect. In future painting projects, we should pay more attention to the control and measurement of paint film sanding to improve the mass and sustainability of painting projects.
