The gloss of the printed matter is a kind of mass beauty. The gloss of the printed material, with the continuous innovation and improvement of the printing materials and printing machinery, is not a difficult problem. However, some manufacturers often cannot satisfy customers' requirements for printed gloss. Gloss, like color, can also respond to human's psychology, especially in printing quality evaluation.
The print gloss is the fingerprints on the product in a certain background and light conditions, between the printing on the surface brightness and brightness distribution on each direction. The optical properties related to the gloss mainly include the reflected light of the surface and the internal reflection light.
Luster and color are collectively known as color and lustre. Because the color is more intuitive, and has a direct impact on people's mental state, emotion and many other spiritual factors, so people on the color of the early research, this research work has been basically mature, and widely used in everyday life.
The lustre of the imprinting is a sign of the quality of the printed matter.
If the print is glossy, it is one of the quality marks of printed matter. If the gloss is enough, it can make the print imprint color brighten up, and enhance the three-dimensional sense of the image, especially the reproduction of the physical picture, which is more glossy and lifelike. In fact, the relationship between the gloss of the ink and the ink is often biased. The more expensive the ink is, the brighter and the brighter the color. There are many aspects of the nature of the ink. The gloss of the ink on the paper are only closely related to the drying form of the ink, which is often ignored. There are two kinds of offset printing inks for printing, art, pictures, color advertisements, calendars, business patterns, exquisite handicrafts, and color inserts. They are most commonly used: light type ink and stationary ink. Some printing factories, short print copies of more than the pursuit of ink that is dry, to the ink supplier for help. The supplier does not have a deep understanding of the customer's requirements and supplies improperly fixed ink. The composition of the fixed ink is mainly the pigment (solid), the connecting material (liquid). The pigment of the ink shows the color, and the luster of the color is determined by the connecting material. The ink is printed on the surface of the paper, and the connecting material is quickly oxidized, polymerized and then conjunctival, that is, a layer of extremely thin transparent oil film is formed. The transparent layer of the film, covered in color pigments, makes the pigment glittering, which is the gloss of the imprinting. There are many factors affecting the gloss of imprinting, which are summed up in the following aspects.
1. the effect of the surface smoothness of the paper on the gloss of the printed material.
2. the effect of ink absorption on the gloss.
3. the influence of the gloss of the paper on the gloss of the printed material.
4. the influence of the strength of paper on the gloss of the printed material.
5. the effect of the acidity and alkalinity of the paper on the gloss of the printed material.
How should the measurement, imprinted gloss can be used for measuring gloss, gloss meter is the most specular gloss measurement of surface darkened print. The mirror gloss refers to the ratio of the reflected light to the incident light.
For example, the angle of incident angle selected for the surface measurement of a handset box is different, and the result is different. The greater the incidence angle, the greater the reflectivity of the mirror, the higher the gloss, and vice versa. Thus, low depends not only on the surface characteristics, but also depends on the angle measurement. As for what kind of angle measurement is appropriate, there is no general standard at present. Generally, a small angle is taken for a high gloss surface, such as 45 degrees; for a low gloss surface, a larger angle, such as 60 degrees and 75 degrees, is measured. At present, the measurement angles of many luster are adjustable for any choice.
