As the main raw materials of printing, PVC, PTE and PP determine the quality of printing ink.Only good performance of raw materials, can obtain a better color printing products.Therefore, it is of great practical significance to understand the relationship between the packaging box performance and the color of printing products. According to the characteristics of printing products and technological conditions, it is reasonable to choose packaging boxes for printing.
First, the relationship between the smoothness of the packaging box and the color effect
Smoothness is packing box surface concave and convex degree of technical indicators, evaluation is said box surface level off, smooth and uniform degree of physical quantities, namely, under the certain condition of vacuum, a certain volume of air, from the box under certain pressure between the test sample surface and the smooth glass surface flow through the time required to measure, its unit in seconds.The higher the number of seconds, the smoother the package.The more smooth the package is, the more even and complete the contact between the paper surface and the printing plate is, the more sufficient the ink layer transfer on the layout (letterpress) or rubber cloth, and the better the color effect of printing products.On the contrary, poor smoothness of the packaging box, ink transfer is not uniform, insufficient, and the paper in the face of ink permeability is strong, color effect is also poor, often easy to make printing ink color hair, hair light.Therefore, fine printing products, the finer the net line, the smaller the dot diameter, the more smooth the use of a good packaging box printing, so that the original manuscript good reproducibility.
2. The relationship between the glossiness of the packaging box and the color effect
The glossiness of the box refers to the degree of specular reflection on the surface of the box, expressed as percentage.The glossiness of the box is higher, its surface can reflect light like a mirror more, can show bright appearance characteristic more.In fact, in addition to mirror reflection on the surface of the box, there is also diffuse reflection, so that the gloss of the box decreased.High gloss packaging box, printing ink color more bright, ink visual effect is good.It can be said that the smoother the packaging box, the higher gloss, the color of the printing products more gloss.The glossiness of the box is closely related to the smoothness, but the glossiness is not smoothness. The box has a glossy surface, not necessarily a smooth surface.From the perspective of the gloss characteristics of the packaging box, it is of great practical significance to choose the appropriate packaging box for printing according to the characteristics of the printing piece.If the layout of the text - based books and periodicals text, it is advisable to choose the general gloss of the paper, so as to avoid reflection, so that the eyes will not be tired for a long time to see.And print the layout that gives priority to with picture plate, appropriate chooses the PVC PTE PP with high glossiness, make printing product ink color is even, thick, bright-coloured and pleasing to the eye.