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The quality of paper bag printing depends on the printing process

Fine craftsmanship and skilled operation are very important for paper bag printing, which deeply affects the quality of paper bag printing. It is also the key for manufacturers to obtain the paper bag printing market. The following Dongguan paper bag manufacturers will share some tips on paper bag printing technology from the aspects of pigment, connecting material and drying time.


1, the size of the pigment particles and the degree of dispersion


Although the role of the ink film capillary is an important factor in forming the gloss of the print, the apparent size of the pigment particles in the dispersed state is more important, which directly determines the state of the capillary of the ink film. Therefore, the pigment particles are small and well dispersed, which is advantageous for forming a smooth ink film, and is also very advantageous for improving the gloss of the paper bag printing.


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


According to the interface chemistry, the capillary permeation rate is inversely related to the viscosity of the liquid, that is, the permeation rate decreases as the viscosity increases. The capillary network structure formed between the ink pigment particles is an important aspect that determines the gloss of the print. At the moment of imprinting, the ink is integrally pressed into the larger pores of the paper; after imprinting, the binder begins to separate from the ink and penetrate into the smaller pores of the paper. Therefore, the size of the ink film capillary determines the amount of separation of the binder. Capillary retention of the binder is much more effective than printing pressure to press 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 the binder which penetrates into the paper pores, thereby improving the gloss and smoothness of the ink film. The high gloss of the ink film means that the specular reflection of the surface is relatively high, so that the human eye can see that the white light reflected by the surface is much less than the ink film with low glossiness in most cases, so that the saturation of the color is more high. Therefore, the print with high gloss looks more vivid and full. The printing ink layer of the spot color ink is mostly translucent or opaque. When selecting the ink formula, the influence of the light transmittance of the ink layer on the spot color printing should be considered according to the actual situation.


The above is about the quality of paper bag printing, it can be said that the quality of the printing depends on the printing process, the details of the process is also crucial.


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