Method for eliminating color difference defects of special-effect color-coated sheets

Abstract

A method for eliminating color difference defects of special-effect color-coated sheets comprises coating material processing and color confirmation, coating material viscosity control, coating process selection, and finished product sampling and color confirmation. The method comprises the following steps: scraping a coating material sample, in which no special-effect related additive is added, measuring color difference of the coating material sample, and controlling a color difference value at 0.5-1.0; adding a special-effect related additive into the coating material sample, scrapping and measuring the coating material sample, controlling the color difference value at 0-0.5, and creating a tendency diagram; controlling the coating material stirring time, the stirring revolution and the coating material temperature, and performing coating with primary liquid; ensuring that the liquid supply frequency of a paint supply pump is 60-65 times per minute; ensuring that the ratio of roller speed to linear speed of a lifting roller is 0.7-0.75 and the immersion depth is 17-19 mm; ensuring that the consumption speed is 4.6-5.4 kg / min and the wet film thickness is 65-75 mu m; sampling each sub-roll, and measuring a side-center-side color difference value, and performing color difference comparison; and inspecting each sub-roll twice, and ensuring that the visual colors of a standard sample and the sub-roll sample are basically consistent. Through the method, the color difference defects of color-coated sheets with special effects such as reticulate pattern, wrinkle and fluff can be reduced, the product yield is up to more than 99%, and the quality cost is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of color-coated steel plates, and in particular relates to a method for eliminating color difference defects of reticulation, wrinkles and suede special-effect color-coated plates. Background technique [0002] Color-coated products with similar special effects such as mesh, wrinkles, suede, etc. are different from ordinary architectural color boards. During the production process, large color differences between batches are prone to occur, and color differences from dots to stripes appear after a period of time in a single batch of production question. In addition, such products are more sensitive to film thickness, and the same film thickness fluctuations will lead to color changes. These problems have seriously restricted the stability of the production of special-effect color-coated panels, and resulted in a seriously low product yield, only 92%. Therefore, a new method must be adopted to effectively co...

AI Technical Summary

Problems solved by technology

In addition, such products are more sensitive to film thickness, and the same film thickness fluctuations will lead to color changes. These problems have seriously restricted the stability of the production of special-effect color-coated panels, and resulted in a seriously low product yield, only 92%. Therefore, a new method must be adopted to effectively control the chromatic aberration defects of special-effect color-coated plates to reduce quality loss