How to eliminate the corrugated box printing failure caused by consumables
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Ink-related printing failure
(1) Ink viscosity is not suitable. The ink viscosity is too low, it is easy to paste when printing, and the water supply must also increase. In the transmission, the water roller will also stick the ink on the plate cylinder to make the dampening solution dirty. In addition, when the printed matter absorbs a large amount of moisture, it will be deformed and bent, which brings difficulties to the post-press processing. Moreover, inks with lower viscosity and cohesive force will also undergo centrifugal flying phenomenon when printing at high speed. If they fly onto the printing plate and are stuck back by the water roller, the dampening solution will be dirty, which in turn will cause paste. The viscosity of the ink is too high, and the ink is difficult to be printed, especially the mesh adjustment is not printed, even if the effect of increasing the amount of ink is not obvious, and the printed matter is prone to sticking.
(2) The printed matter is easy to fade. High-gloss wear-resistant inks are used in the printing of corrugated cardboard to ensure that the printed pattern can withstand frequent handling and friction during transportation. Do not mix gasoline when adjusting the ink, because gasoline will dissolve or crack the cohesive cross-linking material in the ink, destroying the chain structure of the binder. The varnish can not be added too much, otherwise the binder resin in the ink will be removed; the light color will be separated from the coloring material, so that the coloring material is suspended in the form of powder on the surface of the paper, and the oil and its dissolved auxiliaries are all coated with paper. The fiber is absorbed into the inside of the paper. If the printed matter is directly attached to the corrugated fabric, scratches or discoloration may occur in the production: if the coating is carried out, foaming and imaginary floating phenomenon may occur, and the film may be easily released; if it is glazed, it may be easily faded. And scratches; if calendered, varnish and color are easily detached by the steel strip.
(3) The print is too dry. This has a lot to do with the ink adjustment. When printing a large area of the ground, if the fat in the ink is too much, the lipophilic and lipophilic nature of the paper fiber will affect the volatilization and drying of the auxiliary. Moreover, large areas of the printed area often require glazing, which is more detrimental to the drying of the ink. In addition, in the high-temperature drying season, dry oil should not be used too much, and some anti-adhesive agents can be used instead of some dry oil, and the amount of powder sprayed can be appropriately increased to prevent sticking, which may cause trouble to the subsequent laminating process, but the film is covered. The powder removing process can be temporarily added.
Paper-related printing failure
The quality of the paper should be strictly controlled, the strength, tightness, elongation, flatness and gloss of the paper. Indicators such as whiteness should be tested when entering the factory and guaranteed to meet the requirements. The color of the paper will affect the printing effect of the main color. The uniformity of the coating and the flatness of the calender have a great influence on the printing of the mesh. It is easy to cause the inconsistency of the flat screen printing, especially the network of 3~60%. The tone is the most sensitive.
Wrinkles can occur when the deformed paper is printed. The humidity in the workshop should be adjusted to restore the water content of the paper. Paper feeding on curved paper is difficult. The air volume of the paper blowing nozzle and nozzle should be adjusted according to the degree of paper bending. The strength of the paper feeding roller should be increased to ensure good paper feeding. Also note that the fiber direction of the tissue should be perpendicular to the corrugated direction of the box when printing. For products that need to be printed twice, the paper should be loosened on time after printing, and tightly packed after the initial drying to prevent paper deformation and affect overprinting.
For the paper that has been dropped, the viscosity of the ink can be appropriately reduced or the printing pressure can be appropriately reduced to compensate, and the layout with the least pattern text is arranged in the first color group, so that the paper powder and the paper wool are stained as much as possible when printing the first color. And the printing speed should not be too fast, but also wash the blanket. For some papers with heavy powder and heavy hair loss, taking prepress pressure or pre-printing a layer of anti-adhesive agent (add a small amount of white ink) can solve the problem to a certain extent, but in the material. Energy, time and other aspects of consumption will undoubtedly increase costs, and there will still be various problems in post-press processing.
Problems related to post-press processing
For products that need hot stamping, the positioning should be accurate when printing, otherwise it will be prone to hot stamping. The problems that easily occur in the film are blistering and wrinkling. Dark and so on. Poor drying of the printed ink will cause the film to foam, because the organic solvent and moisture in the ink will vaporize and escape after hot rolling, just being sealed by the film, especially when the film speed is too fast. Some facial tissues are wrinkled and the facial tissue is not neat. Bending, tearing the paper when it is covered. Wrinkle. In addition, the wear of the silicone rubber pressure roller of the laminator can also cause wrinkling of the film. The paper has a large moisture content and will be dark after the film is coated. For the gold-plated product, if the paper has too much moisture, the moisture is more difficult to volatilize after the film is coated, and the gold ink is oxidized and blackened.
The brightness of the finished product during calendering mainly depends on four aspects: one is the gloss and flatness of the paper; the other is the amount of oil. The amount of oil is too small, the brightness of the light after calendering is poor, but the amount of oil is too much, and the print is yellow after calendering. Dark; the third is the drying time of varnish. The drying time of varnish should not be too long, otherwise the calendering pressure after drying will be uneven, or the light will not be pressed out, but the drying time of varnish is too short, the varnish solvent is not dried, and the varnish will be stuck by the steel strip after calendering, and the print will be uncovered. Uncovering the flowers, stacking them together after calendering will stick together: Fourth, the old and new steel strips. The effect of calendering of the new steel strip is better than that of the old steel strip.