Determination of ink dryness by permeable drying method and volatile drying method

Penetration drying method and volatile drying method, put a drop of the ink to be tested on the cotton white cloth that has been desized beforehand, and record the time at the same time. The time required for the cotton fiber to absorb the ink is the penetration dryness of the ink to be tested.

If filter paper is used instead of cotton cloth, the volatility of solvent-based inks can be determined.

(1) Equipment and materials.

①Apparatus.

(i) Minor Ink Knife.

(ii) A round glass rod (diameter 0.5 cm) about 15 cm long.

(iii) stopwatch.

② material.

(i ) Desized cotton cloth.

(ii) filter paper.

(2) method.

Use a small ink knife or a round glass rod to fully stir the ink to be tested evenly, and then lift the small ink knife or a round glass rod from the ink. At this time, the ink will flow into a line, and the flow line will be broken to form ink droplets. The second drop of ink is placed on cotton cloth or filter paper, and the stopwatch is turned on at the same time, and the stopwatch is turned off when the ink drops are not liquid and reflective.

(3) Precautions.

The uniform degree of ink stirring has an impact on the measurement results.

② The degree to which the ink knife or round glass rod penetrates into the ink is also related to the measurement result, because it means that the size of the formed ink droplet is different.

③The so-called non-liquid reflection means that the liquid part of the ink is absorbed by the cotton cloth or filter paper.

④The measurement should be carried out under the condition of temperature and constant humidity, the temperature is 25±1℃, and the relative humidity is 65%±5%. The cotton cloth or filter paper used for the measurement should be stored under this condition for more than 24 hours in advance.

⑤ The dryness of the volatile and dry liquid ink can also be measured by a double-slot scraper instrument. In this way, the standard ink and the tested ink can be placed in two slots, scraped off with a scraper, and then observed to judge its dryness.