Thickness management is an important content in construction quality management.The so-called film thickness management refers to the process of controlling the film thickness and the detection, identification, quality feedback and treatment of the film thickness after the construction of the floor paint.The purpose of film thickness management is to make the thickness of the floor coating not only reach the designed thickness, to ensure the protective performance, but also to avoid the waste caused by excessive thickness.
Floor paint has clear requirements for each item of film thickness management. For example, in the coating process design, the thickness of each thick film and dry film has strict regulations, which should be carried out according to the requirements.
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Thickness management includes wet film thickness measurement and dry film thickness measurement.During the coating process, the wet film thickness is usually tested in time for each layer of coating.Dry film thickness can be detected during construction, but the total dry film thickness must be tested after completion of construction.
1. Test the thickness of wet film
The wet film thickness measurement is generally determined by the coating personnel to guide the construction personnel, it is expected that the dry film thickness needs to be coated in the specified amount of paint.There are two types of wet film thickness gauges: wet film thickness wheel gauge and wet film thickness comb gauge.Related books introduce the wet film thickness measurement method and technology.The advantage of using a wet film thickness gauge is that improper film thickness can be checked and corrected during the coating process.If the builder knows the wet film thickness, the dry film thickness can be estimated when the data is multiplied by the percentage of paint solids by volume, or the builder can estimate the dry film thickness by the amount of paint built in a small area, combined with the recommended data for the product specifications.
In practice, it is difficult to repair after destructive tests, so the measurement of wet film thickness and the accumulation of various coating thicknesses, as well as the control of coating dosage (such as solvation-free self-leveling floor paint construction), can often replace the measurement of dry film thickness.
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2. Dry film thickness detection
The importance of measuring dry film thickness is to ensure that the coating reaches the required thickness to avoid premature failure due to inappropriate coating thickness, especially for floor coatings.Dry film thickness measurements must be made using a dry film thickness gauge after the film is completely dry.
The commonly used dry film thickness gage on the floor is the destructive thickness gage and calipers.When testing, the selection of measuring points should pay attention to representativeness.Due to the destructive nature of the testing, sampling and inspection can only be carried out in areas such as edges and corners that do not affect the appearance.The requirements for film thickness are generally as follows: the average value of all thickness measurement points should not be less than 90% of the specified dry film thickness;The number of measuring points not reaching the specified dry film thickness should not exceed 10% of the total number of measuring points.
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If the thickness is not reached, it should be treated in the following ways: the qualified rate is less than 80%, and it needs to be completely coated;Qualification rate of 80%, ≤ 90%, local coating should be carried out according to the situation.Many coatings are thicker than specified standards, which is usually not a problem, but it brings too much wear and an increase in coating costs.Because the coating thickness is too large will affect the evaporation and complete drying of the solvent, as well as the curing of the next layer of coating, too thick coating will also produce wrinkling or cracking defects, which is worthy of attention.When the film thickness in construction exceeds 10% of the maximum dry film thickness, efforts should be made to solve the problem.
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