1. Principle
Compare the sample with the standard sample in a parallel scraping method to check whether the color of the sample meets the standard sample.
2. Tools and materials
(1) Conical steel body with black handle and wooden handle, 200mm long, 20mm widest and 8mm narrowest.
(2) The blade is made of stainless steel, 92mm × 59mm × 0.5mm, and the blade is 9 ° wide at an angle of 25 °.
(3) Glass plate 200mm × 200mm × 5mm.
(4) Scratch proof paper (in accordance with ZB Y32 002), specification 110mm × 65mm, with a 5mm wide black solid bottom cross at the top 60-65mm.
(5) Cellophane 65mm × 30mm.
3. Inspection conditions
(1) The inspection should be carried out at a temperature of (25 ± 1) ° C and a relative humidity of 65% ± 5%.
(2) The inspection surface color and color light should be carried out under the standard illumination body with an incident angle of 45 ° ± 5 °.
(3) When checking the background color, the scratch should be seen through the light. [next]
4. Inspection steps
(1) Take 5g each of the standard sample and the sample with an ink-adjusting knife, place it on a glass plate, and mix it separately.
(2) Sampling about 0.5g on the upper left side of the scraping paper with an ink adjusting knife, and then taking about 0.5g of the sample on the upper right side of the scraping paper, the two should not be adjacent to each other.
(3) Place the doctor blade over the coated ink sample so that the main part of the doctor blade is 90 ° from the doctor sample paper. Scrape the ink into a thin layer on the scraping paper from top to bottom, and reduce the force when it reaches 15mm under the black cross. Make the inside angle of the blade approximately 25 °, so that the ink is coated on the paper to form a thicker ink layer. The final scraping shape should be similar to Figure 13-1.
(4) The thin layer of ink on the scraped sample paper is called complexion; the ink-advancing layer on the lower part of the scraped sample paper is called ink color; the thin layer of ink on the scraped sample paper is called the base color.
(5) After ink color inspection is completed, cover cellophane on the thick ink layer.
5. Inspection results
(1) Lithographic ink and letterpress ink focus on checking whether the sample's face color and background color are similar and consistent with the standard sample.
(2) Screen printing ink and gravure printing ink for paper mainly check whether the color of the sample is similar to or consistent with the standard sample.
(3) The inspection result should be based on the color and background color observed within 5 minutes after scraping the sample, and the ink color is for reference.
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