Ink coloring force test method
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1, the principle
The sample and the standard were diluted by the quantitative standard white ink, and the concentration of the ink after the dilution was compared, expressed as a percentage.
2, tools and materials
(1) Ink-adjusting knives, tapered steel body, length 200mm, widest 20mm, narrowest 8mm.
(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) Scratch paper Base paper (in accordance with ZB Y32 002), size 110mm × 65mm.
(4) Standard white ink.
(5) Standard black ink.
3, the instrument
(1) Analytical balance The maximum load is 200g, and the sensitivity is 1mg.
(2) Round glass piece 2mm, diameter 90-100mm.
4, inspection conditions
(1) The test shall be carried out at a temperature of (25 ± 1) ° C and a relative humidity of 65% ± 5%.
(2) When observing the dilute scraping, it should be carried out under the D65 standard lighting body.
5, inspection steps
(1) Using an analytical balance, 2 g of standard white ink and 0.2 g of sample ink were weighed on a round glass piece. In the same way, the standard white ink and standard ink were weighed in the same ratio. Mix the well-known inks thoroughly with the ink-adjusting blade.
(2) Apply about 0.5g of the standard sample prepared by adjusting the ink to the upper left side of the scraping paper, and then apply about 0.5g of the homogenized sample to the upper right of the scraping paper. The two should be adjacent to each other.
(3) Place the doctor blade over the coated ink sample so that the blade body portion is perpendicular to the doctor blade. Then, the ink is scraped into a thin layer on the scraping paper from top to bottom. When scraping to 35-45 mm, the force is reduced, the inner angle of the blade is approximately 25°, and the ink is coated on the paper to form a thick ink layer. . The final scraping shape should be similar to the schematic in GB/T 14624.1.
(4) Observe whether the color and ink color of the sample and the standard are consistent. If they are inconsistent, change the amount of standard white ink of the sample until the diluted sample is consistent with the standard. Calculate according to the formula to obtain the percentage of the coloring power of the sample.
(5) After scraping, the ink color reflected by the observation within 30S shall prevail.
6, test results
S=B/A×100%
Where S is the percentage of tinting strength (100% by standard), %;
A——Dilute the standard white ink dosage, g;
B——Dilute the amount of white ink in the sample, g.