Ink color inspection method
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1, the principle
Compare the sample with the standard sample in a side-by-side manner and check whether the color of the sample meets the standard.
2, tools and materials
(1) Ink knives The tapered steel body of the wooden handle is 200mm long, 20mm wide at the widest point and 8mm at the narrowest point.
(2) Scraper A stainless steel sheet, 92 mm × 59 mm × 0.5 mm, and a blade width of 9 mm is bent outward by 25°.
(3) Glass plate 200mm × 200mm × 5mm.
(4) Scratch paper The paper (according to ZB Y32 002) with a specification of 110mm×65mm and a 5mm wide black solid cross at the top 60-65mm.
(5) Cellophane 65mm × 30mm.
3, inspection conditions
(1) The test shall be carried out at a temperature of (25 ± 1) ° C and a relative humidity of 65 ± 5.
(2) Viewing the face color and shade should be performed under the standard illumination body with an incident angle of 45 ° ± 5 °.
(3) Check the background color should be scraped to the light.
4, inspection steps
(1) Use the ink-adjusting knife to take the standard sample and the sample about 5g each, place it on the glass plate, and mix it separately.
(2) Approximately 0.5 g of the sample was applied to the upper left side of the squeegee paper, and about 0.5 g of the sample was applied to the upper right side of the squeegee paper, and the two should be adjacent to each other.
(3) Place the blade over the coated ink sample so that the blade body portion is at 90° to the doctor sample. The ink is scraped into a thin layer on the scraping paper from top to bottom, and the force is reduced when it is 15 mm below the black cross. The inner side of the blade is approximately 25° so that the ink is applied to the paper as a thicker layer of ink. The final scratch shape should be similar to Figure 13-1.
(4) The thin layer of ink on the scraping paper is called the face color; the ink intake layer in the lower part of the scraping paper is called the ink color; the thin layer of the ink on the scraping paper is called the ground color.
(5) After the ink color inspection is completed, the cellophane is covered on the thick ink layer.
5, the test results
(1) The lithographic ink and the letterpress ink focus on whether the color and background of the sample are similar to the standard.
(2) The mesh version of the ink and the gravure ink for the paper are used to check whether the color of the sample is similar to the standard.
(3) The inspection result shall be based on the color and background color observed within 5 minutes after the scratching, and the ink color shall be used for reference.