1, to prevent paper expansion resulting in poor Printing phenomenon custom Printing packaging is the use of oil and water do not dissolve the principle of printing. Therefore, after printing, the paper generally extends, and the contraction becomes shorter, which is rare. In order to eliminate such faults, the relevant printing process is discussed. Paper is a material containing variable plant fiber tissue, which has the function of hygroscopic and hygroscopic release, and when the moisture in the air is constantly changing, it will adjust and balance the air humidity. When the air humidity is higher than the water content of the paper, it will absorb the water in the air and expand and expand; On the contrary, it releases water and shrinks shorter to achieve a relative balance with ambient humidity. custom Printing packaging is the use of oil and water do not dissolve the principle of printing. Therefore, after printing, the paper generally extends, and the contraction becomes shorter, which is rare. In order to eliminate such faults, the relevant printing process is discussed.

2, printing as far as possible to use horizontal grain paper has horizontal grain and vertical grain. In the papermaking part of the papermaking process, because the pulp (plant fiber) flows vertically to the moving wire mesh, the fibers are suddenly accelerated, and most of them are connected along the direction of the motion of the wire mesh, forming what we call vertical and horizontal strands. The plant fibers in the paper are hollow and translucent tubes, and we can visually say that the length direction of the fiber itself is what we call the longitudinal grain, and the direction of the fiber and the fiber gap is the transverse grain. The experimental results show that the cohesion of the fiber itself is greater than the bonding force between the fibers (mainly hydrogen bonding force). After the paper is wet, the expansion and contraction in the direction of the longitudinal tuft is smaller than that in the direction of the horizontal tuft, and the two are roughly 1:2. Therefore, products with more accurate overprinting must consider the deformation relationship of the horizontal and vertical strands of the paper. Therefore, when printing, the direction of the longitudinal grain of the paper is parallel to the roller shaft, and the direction of the grain of the same batch of printing paper should be consistent.

3, overprint water (commonly known as pressure water) in the case of printing paper is not well mastered, in order to prevent the paper from stretching in printing, you can use the method of overprint a water first, so that the paper can adapt to the printing requirements, and then start printing color, this method has a certain role in solving the overprint is not allowed.

4, control the printed page moisture size is the key factor to control the paper expansion, the layout of the water through the rubber blanket to the paper, the larger the layout moisture, the larger the expansion. Therefore, the smaller the moisture control of the layout, the better, especially when printing 80 grams of double-tape paper.

5, the use of plate drawing machine to elongate the printing plate in the third and four-color printing process, the two-color machine in the second printing process, the image on the paper has stretched and increased, resulting in overprinting is not allowed. This is because PS plate material has good ductility, can be stretched by the plate drawing machine, so that the plate image with the image on the paper balanced elongation and accurate overprinting.

custom Printing packaging https://www.thpkgg.com/