When the paper fiber absorbs water and expands, the dimension of the cross-section of the fiber varies greatly, while the length direction is almost unchanged. Therefore, in the printing process, the stretching ratio of the paper sheet in the transverse direction is larger than that in the longitudinal direction. Because the edge of the paper is in contact with the air during storage, there is less contact in the middle. When the humidity in the environment is lower than the humidity in the paper, the paper absorbs moisture to generate a “foliage†phenomenon. When the humidity in the environment is lower than the paper humidity, the paper is released to generate moisture. "Tight edge" phenomenon. If the paper has “foil†or “tight edge†phenomenon before printing, the paper undergoes different pressure deformation during printing, which will result in inaccurate overprinting of printing and graphic printing. In severe cases, the paper is prone to print wrinkles.
Changes in water content can also cause problems with curling of the paper. As one-sided coated paper has a coating on one side and highly absorbent fiber on the other, the coating does not substantially expand and contract, and the degree of fiber expansion is relatively large. Therefore, the curling problem of single-sided coated paper is more prominent than that of double-sided coated paper. In a relatively high humidity environment, single copper paper tends to curl onto the coated surface due to its moisture absorption; in a relatively low humidity environment, the single copper paper can be easily curled toward the fiber surface due to moisture release. At the same time, if the moisture content of the single copper paper changes during the printing process (over-drying or over-wetting), the moisture balance of the fibers and paint is destroyed, and if moisture is lost, it curls toward the uncoated surface and absorbs moisture. Coated surface curled. If the paper has curling problems before printing, it will affect the smoothness of the printing and the printing efficiency; if the paper is curled during the printing process or after the printing, it will have a serious impact on the subsequent processing, packaging and other operations.
Changes in the moisture content of the paper will not only cause distortion of the paper, but will also cause changes in other properties of the paper, directly affecting the printability of the paper. If the moisture content of the paper is too large, the tensile strength and surface strength of the paper will decrease, and the plasticity will increase. The drying speed of the print will be affected, and the back surface of the paper will be stained easily. If the water content of the paper is too small, the paper will be brittle and hard during the printing process. A large amount of static electricity may be generated due to friction, resulting in poor paper feeding or uneven paper delivery, thereby wasting paper and affecting printing efficiency.
Since the paper is greatly affected by the environment, it is recommended that the outer packaging of the paper should not be removed as early as possible.
Changes in water content can also cause problems with curling of the paper. As one-sided coated paper has a coating on one side and highly absorbent fiber on the other, the coating does not substantially expand and contract, and the degree of fiber expansion is relatively large. Therefore, the curling problem of single-sided coated paper is more prominent than that of double-sided coated paper. In a relatively high humidity environment, single copper paper tends to curl onto the coated surface due to its moisture absorption; in a relatively low humidity environment, the single copper paper can be easily curled toward the fiber surface due to moisture release. At the same time, if the moisture content of the single copper paper changes during the printing process (over-drying or over-wetting), the moisture balance of the fibers and paint is destroyed, and if moisture is lost, it curls toward the uncoated surface and absorbs moisture. Coated surface curled. If the paper has curling problems before printing, it will affect the smoothness of the printing and the printing efficiency; if the paper is curled during the printing process or after the printing, it will have a serious impact on the subsequent processing, packaging and other operations.
Changes in the moisture content of the paper will not only cause distortion of the paper, but will also cause changes in other properties of the paper, directly affecting the printability of the paper. If the moisture content of the paper is too large, the tensile strength and surface strength of the paper will decrease, and the plasticity will increase. The drying speed of the print will be affected, and the back surface of the paper will be stained easily. If the water content of the paper is too small, the paper will be brittle and hard during the printing process. A large amount of static electricity may be generated due to friction, resulting in poor paper feeding or uneven paper delivery, thereby wasting paper and affecting printing efficiency.
Since the paper is greatly affected by the environment, it is recommended that the outer packaging of the paper should not be removed as early as possible.
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