The properties of the plastic box material PVC, PTE, and PP determine the quality of the printed ink. Only the raw materials with good properties can obtain better print product color rendering effects. Therefore, a correct understanding of the relationship between the performance of the plastic box and the color of the printed product, according to the characteristics of the printed product and the process conditions, reasonably selecting high quality raw materials for printing has important practical significance for improving the quality of the product.
1. The relationship between the smoothness of the plastic box and the color rendering effect
Smoothness is a technical index for evaluating the degree of surface roughness of a plastic box, and is a physical quantity indicating that the surface of the plastic box is flat, smooth, and uniform, that is, under a certain vacuum condition, a certain volume of air is tested under a certain pressure from a plastic box. The time required to flow between the surface and the smooth glass surface is measured in seconds. The higher the second, the better the smoothness of the plastic box. The better the smoothness of the plastic box, the more uniform and complete the contact between the surface of the material and the printing plate at the time of printing, the more sufficient the ink layer transfer on the layout (relief) or the blanket, and the better the coloring effect of the printed product. On the contrary, the poor smoothness of the plastic box raw materials, ink transfer is not uniform, and inadequate, and the raw material surface of the ink permeability, coloring effect is also poor, often easy to make ink printing ink, hair fade. Therefore, for products with fine print, the finer the network cable and the smaller the diameter of the dot, the more should be printed with a smooth box of plastic material, so that the original can be reproduced well.
2. The relationship between gloss and color rendering of plastic box
The gloss of the plastic box refers to the degree of specular reflection on the surface of the plastic box and is expressed as a percentage. The higher the gloss of the plastic box is, the more mirror-like the light reflected on the surface of the plastic box, the brighter the appearance characteristics. In fact, in addition to the specular reflection on the surface of the plastic box, there is diffuse reflection, which causes the gloss of the plastic box to decrease. High gloss plastic box raw materials, printing ink color is also more vivid, ink visual effect is also good. It can be said that the smoother the raw material of the plastic box, the higher the gloss and the higher the glossiness of the printed product. There is a close relationship between the glossiness and the smoothness of the plastic box material, but the glossiness is not smoothness. The shiny surface of the plastic box material is not necessarily a smooth surface. From the perspective of the glossiness of the raw material of the plastic box, it is of great practical significance to select suitable plastic box raw materials for printing according to the characteristics of the prints. Such as the text of the layout of the main text of the book, should choose the general paper gloss, so as not to reflect, so that the eyes do not look tired for a long time. The printing of the plate-based layout, should use high-gloss PVC, PET, PP materials, so that the ink is uniform, thick, bright and pleasing.
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