Method for eliminating color difference defects of special-effect color-coated sheets
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A color-coated board and color difference technology, which is applied to the surface coating liquid device, coating, special surface, etc., can solve the problems of low product yield and restrict the stability of special-effect color-coated boards, so as to improve the product yield, The effect of reducing the cost of quality
Inactive Publication Date: 2016-08-24
ANGANG STEEL CO LTD
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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 co...
Method used
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Embodiment 1
[0027] 1. Paint processing and color confirmation
[0028] 1. When making paint, first do not add additives related to special effects. After mixing the resin, color paste and other additives, take the paint sample and stir it at high speed to measure the color difference, and control the color difference value △E to 0.7.
[0029] 2. After the color difference adjustment is qualified, add additives related to special effects, take the paint sample after high-speed stirring, scrape the sample and measure the color difference again, control the color difference value △E to 0.5, and the color difference items △L, △a, △b are respectively 0.2, 0.25, 0.3, and the scraped sample is basically consistent with the standard batch sample visually.
[0030] 3. Scrape samples in the laboratory to simulate the change trend of product color difference within the fluctuation range of normal process parameters, and establish a trend chart to determine the direction and range of process adjustme...
Embodiment 2
[0045] 1. Paint processing and color confirmation
[0046] 1. When making paint, first do not add additives related to special effects. After mixing the resin, colorant and other additives, take the paint sample after high-speed stirring and scrape the sample to measure the color difference. The color difference value △E is controlled at 0.9.
[0047] 2. After the color difference adjustment is qualified, add additives related to special effects, take the paint sample and stir it at a high speed, scrape the sample and measure the color difference again, control the color difference value △E0.3, and the color difference sub-items △L, △a, △b are respectively 0.3, 0.26, 0.22, and visually compare the scraped sample with the standard batch sample, which is basically the same.
[0048] 3. Scrape samples in the laboratory to simulate the change trend of product color difference within the fluctuation range of normal process parameters, and establish a trend chart to determine the di...
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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...
Claims
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Application Information
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