Printing ink performance inspection -- Color, Gloss, Viscosity

1. color

A printed matter gives people the most direct feeling, first of all, how bright the color is, and how authentic the pattern is, that is to say, in addition to the pattern color separation plate making and pattern structure factors, the focus is on the final color and light effect of the ink. For printing products with a large printing volume, the ink color is required to be consistent, otherwise it will cause inconsistency in the color of the printed products, so color inspection becomes a very important item.

2. Gloss

Ink gloss is mainly the ability to reflect in one direction after the surface of the printed matter is exposed to light. Measured by a radio-gloss meter, the gloss on the newspaper is 8-20% or more, and the gloss on the plastic film is more than 40%.

3. Viscosity

The viscosity of the ink is related to the viscosity of the binder. For the ink using the same pigment, the viscosity of the ink is high, and the viscosity of the ink is also large. The viscosity of the ink refers to the liquid medium including the solvent in the ink component.

The viscosity of the ink is related to the amount of pigments and fillers. For a certain amount of linking material, the greater the content of pigments and fillers, the higher the viscosity.

The viscosity of the ink is related to the properties of the pigment. For example, the golden red C-series lake pigment has agglomeration in most solvents, which makes the ink lose its flow and is not easy to use.

Ink viscosity is also related to the degree of dispersion, the better the dispersion, the smaller the viscosity; otherwise, the greater the viscosity. Of course, as far as the same pigment and linking material are in a certain ratio, sometimes the viscosity will increase if the dispersion is too much.

Ink viscosity is related to the miscibility (miscibility) of solvents and resins, solvents and solvents. Miscibility or poor dissolution will cause inappropriate viscosity.

There are two ways to measure viscosity now, one is relative viscosity (as measured by No. 4 cup), and the other is absolute viscosity (measured by Rotational Viscometer).