Determination of adhesion of paint film
The adhesion of the paint film refers to the ability of the paint film to combine with the surface of the coated object, which is crucial for the quality and protection of the coating. Good adhesion can ensure that the paint film is not easy to fall off during use, effectively protecting the wood products.

According to the national standard GB4893.4 “Furniture surface paint film adhesion cross-cutting determination method”, the determination method of paint film adhesion is as follows:

Equipment and Materials:
Use a suitable film adhesion tester (such as type EE), and other models of the same type can also be used.

Specific blades made of CrO3 alloy tool steel or CrO6 material specified in the GB1299 standard with a blade thickness of 0.43 ± 0.03mm.

Method for determination of adhesion to paint film

Test steps:
Select three test areas on the sample, and cut two sets of vertical grid marks on the paint film of the test area using a blade and a template. Each group of cuts consists of 11, with a length of 35mm and a spacing of 2mm. Make sure the cut penetrates into the substrate surface.

The direction of the cut is at a 45 degree Angle to the direction of the wood grain. Then gently remove the film with a paint brush, place the zinc oxide plaster on the score, press with your fingers, and quickly uncover. After this, use a 4x magnifying glass to observe the damage of the paint film from multiple angles.

The damage degree of the paint film is rated according to the rating criteria.

The purpose of the film adhesion determination method is to ensure that the bond between the film and the substrate is strong to ensure the quality and service life of the coating. This test can help to monitor the performance of the coating under different environments and stresses, so that the necessary measures can be taken to ensure the stability and reliability of the coating.