What should I pay attention to when making and printing paper bags?

　As the concept of low-carbon life matures, more and more shopping malls use environmentally friendly paper bags. In order to give customers a better impression. In addition to high-quality services and products, in fact, the aesthetics of environmentally friendly paper bags can not be ignored, and the probability of secondary use is greater, so they are sought after by many people. So, what should be paid attention to when making paper bags and printing?

　1. The size of the pigment particles and the degree of dispersion

　The glossiness of printing for making paper bags depends on the capillary of the ink film. However, the apparent size of the pigment particles in the dispersed state is more important, and it directly determines the state of the ink film capillary. Therefore, the pigment particles are small and well dispersed, which is very beneficial for paper bag production and printing.

　二. The viscosity of the binder and the content of the pigment

　The capillary network structure formed between ink and pigment particles is an important aspect that determines the gloss of paper bags. At the moment of embossing, the ink is pressed into the larger pores of the paper as a whole; after embossing, the binder begins to separate from the ink and penetrates into the smaller pores of the paper. Therefore, the size of the ink film capillary determines the amount of separation of the connecting material. The capillary's role in retaining the binder is much greater than the printing pressure that presses the binder into the pores of the paper.

　3. Drying time

　The rapid drying of the ink film on the paper surface can reduce the amount of binder penetrating into the pores of the paper, thereby improving the gloss and smoothness of the ink film. The high gloss of the ink film means that the degree of specular reflection on the surface is relatively high, so that in most cases the human eye can see that the white light reflected on the surface is much less than that of the low gloss ink film, which makes the color saturation more high. Therefore, the printing of paper bags with high gloss looks more colorful and fuller.

　Four. Prevent smearing on the back side

　Paper bag production and printing often have full pages and solid ground, which is easy to cause smearing on the back. Use powder spraying method to solve. However, it should be noted that powder spraying will affect the surface gloss of the printed matter, and pollute the environment, and will wear and stick to the paper delivery of the offset printing machine. What needs attention is the correct arrangement of the printing color sequence. In order to avoid smearing on the back side caused by the collision of the paper when the imprint is not dry, the text and line plate should be printed first, and then the solid plate should be printed.

　5. Post-press process

　After the paper bag is made and printed, it needs to be processed, and the aesthetics and quality are even stronger. There are 12 kinds of post-press crafts. They are embossing, die-cutting, hot stamping, partial UV technology, freezing point snowflakes, reverse frosting, embossed hot stamping, lithographic paper, laser transfer, glazing and waxing, hot stamping, and laminating. The above are the issues that need to be paid attention to in paper bag making and printing. Of course, there are many details that need constant attention to get a beautiful and practical paper bag making.

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