How to better control the printing gloss?

Gloss and color are collectively referred to as color, because color is more intuitive and has a relatively direct impact on many spiritual factors such as people's psychological state and emotions. Therefore, people's research on color started earlier, and the research work in this area has basically matured. And it has been widely used in daily life. Gloss, like color, can have a certain impact on people's psychology, especially in the quality evaluation of printed matter.

The so-called gloss of the printed matter refers to the contrast relationship between the luminance on the surface of the printed matter and the distribution of light height in all directions under a certain background and lighting conditions. The optical properties related to gloss mainly include surface reflection and internal reflection light.

1. Surface reflection light

Surface reflection light is composed of surface regular reflection light and surface diffuse light. The light that conforms to the law of reflection is called regular reflection light. The strength of regular reflection light is not only related to the reflectivity of the material, but also mainly related to the state of the light-receiving surface of the object. In general, the smoother and flatter the surface, the stronger the reflected light. Specular reflected light is a special information in the reflected light of an object, which has special significance for gloss research. For example, in the industrial standards of Japan and the United States, most of the specular gloss directly related to regular reflected light is used. Regularly reflected light is basically reflected by the surface of the object, so the object has little selective absorption of this part of the light, and its spectral composition is basically the same as the original incident light. Surface diffuse light means that the actual mirror surface is not a satisfactory mirror surface, so it will cause light diffusion. At this time, it can be considered as the superposition of light reflected by many small mirror surfaces. When the brightness of the diffusing surface is constant, it is called a cosine diffuser.

2. Internally reflected light

After the light is refracted into the object, the part of the light that is reflected from the inside of the object and enters the original medium is called the internal reflection light. The internally reflected light is selectively absorbed by the substance, causing its spectral composition to change. If the incident light is white, the internally reflected light will turn into colored light at this time to show the color of the object.

How to better control printing gloss?

The effect of the glossiness of the paper on the gloss of the finished product. The gloss of the paper itself has a considerable effect on the gloss of the finished product. The gloss of the coated paper surface mainly depends on all the glossy materials and the processing accuracy of the paper during papermaking. Brightening materials include aluminum stearate, paraffin wax, insect wax, etc. The finishing method is super calendering. The paper processed by the above method has a smooth surface, so that the paper itself forms a specular reflection of light (one-way reflection). ) performance, printed ink with higher transparency, the gloss effect of the finished product is better.