What aspects of color printing carton need to be improved? Sizing degree: In order to get used to the hot and humid climate in the south and the demand for refrigerated packaging, corrugated packaging cartons should have a certain sizing degree; Wet strength: In order to get used to cold storage packaging and make the packaging carton adhere to certain compressive strength under low temperature and wet environment, corrugated packaging carton should have a high wet strength; Folding resistance.

Food packaging carton has heterogeneous and disordered structural elements. In the composition of paper, there are both longer and shorter fibers from different sources (mainly plant fibers, synthetic fibers and mineral fibers are less), fillers, sizing materials and pigments. Plant fiber is the foundation of the structure of most kinds of paper. Because of different types of fiber raw materials and processing methods, their structures and properties are also different. The anisotropy of structural elements scattered in three directions perpendicular to each other is shown in the different arrangement directions of fibers, the different dispersion of fibers of different sizes, as well as the dispersion of rubber, pigments, fillers and contained air. The anisotropy of this structure mainly depends on the paper making method and the equipment used. It also has different effects on the primary properties of various aspects of the paper web. The tendency of fiber flocculation also affects the properties of paper in all directions.

The characteristics of the porous colloid of the carton structure for packaging determine some properties of the paper, such as absorbability, permeability, moisture absorption, deformation when moisture changes, and irreversible changes in properties due to drying. The combination of mechanical strength and other properties of the paper is determined between the structural elements of the paper. The structure of most of the paper used for food packaging cartons has two sides, that is, the two sides of the paper web are different in nature. This is not only due to the anisotropy of the distribution of the structural elements already pointed out above, but also due to the difference of the two sides of the paper. The two sides of the paper are in different states, usually because one side of the paper touches the screen and the other side touches the blanket, leaving prints on the paper surface accordingly. The side touching the screen is generally not smooth and porous.

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