Plastic profile color matching professionals should use the following steps to match the samples provided by customers. According to the given conditions, including the type of plastic, the use of plastic products, and the plastic molding process. The uses of plastic products include light resistance and weather resistance, migration, hiding power, transparency, aging resistance, toxicity (heavy metals), food hygiene (FDA), acid and alkali resistance, solvent resistance, mechanical strength, and thermal properties , Electrical performance, etc.
1. Color comparison: The color comparison between the sample and the sample provided by the customer is a very important part of color matching. According to the customer's plastic profile sample production process to make sample comparisons, film products are often compared by blown film method, injection molded products are compared by injection molding method, and fiber products are compared by spinning method.
(1) The influence of the light source. It is best to use natural light as the light source during visual inspection. If possible, you can use a standard light source box. Otherwise, comparing the colors of two plastic profile samples under certain lights may make the colors look the same because of the "metamerism" phenomenon, but Under natural light, there is a large color difference.
(2) The influence of thickness. Products of different thicknesses have different feelings to the human eye; smaller thicknesses are more transparent and lighter in color. Therefore, when matching colors, try to make the thickness of the sample and the customer's sample as consistent as possible.
(3) The influence of surface condition. Different surfaces have different light reflections. For example, on the same plastic profile sample, the color of a high-gloss surface into a matte surface is obviously different. On the same sample, the rough surface is darker and darker than the smooth surface. Therefore, it is necessary to compare the parts with similar surface conditions as much as possible during colorimetric observation.
(4) The influence of resin. The same pigment used in different resins has different colors. This is caused by the difference in the color and transparency of the resin. Therefore, the color should be matched with the resin provided by the customer to ensure the accuracy of the color, especially the modified material. Pay more attention to color matching.
(5) The colorimetric judgment is wrong. The most common problem in the process of checking is colorimetric judgment errors. The judgment errors are mainly caused by insufficient experience. Usually they can only be solved by continuous practice and enriching experience. Appropriate use of some instruments such as colorimeters can also be used. Contribute to correct judgment.
2. Metamerism: A pair of plastic profile samples are made of different colorants. When they are illuminated by a specific light source and viewed by a specific observer, the colors match. If once the lighting changes, the object will no longer match. Metamerism is common and sometimes unpleasant, but metamerism can make many different pigment color combinations possible. Toxic colorants can be replaced with non-toxic colorants. Expensive colorants can be replaced with cheap colorants to reduce costs. Due to the existence of metamerism, it is possible to use different colorants to give a new formula. Color matchers can assign coordinates to a product in a color space to match their colors, even though they are made of different colorants. The only way to eliminate conditional color matching of objects is to use the same colorant.
