1. Introduction
Color, as a manifestation of vision, is the perception of the human eye under the irradiation of light of different wavelengths. In the field of painting, the Color of film refers to the reflection or projection of the surface under the irradiation of light after absorption, reflection, refraction, etc. The determination of film Color is of great significance for evaluating the painting effect, quality control and compliance with standards.
2. Relevant standards
GB/T 9761 and ISO 3668are national and international standards related to the determination of Paints and varnishes Color, which provide accurate specifications and methods for the determination of film Color.
3. Introduction of inspection methods
3.1 GB/T 9761Visual Colorimetrics of Paints and varnishes Paints
3.1.1 Test principle
This method evaluates the Color Difference between the specimen sample and the master standard sample (or standard Formula Guide) under a certain Light source (such as natural sunlight or artificial sunlight).
3.1.2 Materials and equipment
The substrate needs a flat material, such as tinplate, hard aluminum plate, steel plate or Glass plate; specimens and master standards (or standard Formula Guide); Color Assessment Cabinet and other equipment.
3.1.3 Operational Points
Preparative template: Preparative sample template and master standard template, construction and drying under the same conditions.
Colorimetric Procedure: Place the specimen template and the master standard template (or standard Formula Guide) side by side, and use natural sunlight or artificial sunlight for Colorimetric. Color differences are observed, and the distance from the eye to the template is generally about 500mm.
Evaluation of conditional color scheme: For the case where the sample and the master standard contain different pigments, it is necessary to observe the CIE Standard light source D65 and A (tungsten filament lamp) respectively to determine whether the color is equal.
3.1.4 Results show
The result is determined whether the Color is consistent.
3.1.5 Notes
The observer must have normal vision and no visual impairment.
Colorimetric time should not be too long to avoid eye fatigue.
Avoid looking at light or complementary colors immediately after observing strong colors, and continue Colorimetric after observing on neutral gray for a few seconds.
The observer should wear neutral color clothing and perform Colorimetric in a neutral gray environment to avoid the reflected light of colored objects affecting the results.
4. Method application and significance
Color measurement of film is an important method to evaluate film Color. By this method, the difference between the Color of the film sample and the standard sample can be compared under the Standard light source, so as to ensure that the Color of the film is consistent with the design requirements and improve the product mass.
5. Conclusion
Color determination of film is of great significance for ensuring the conformity and mass control of film Color. Using this method, the difference of film Color can be objectively and accurately evaluated, and reliable data support for the quality control of painting projects can be provided to ensure that the film meets the design and standard requirements.
