Carton paper printing failure and break (4)

Several process technology measures to prevent print quality failure

It is necessary to stir the ink in the ink fountain and pay attention to increasing the ink in the ink fountain at a proper time.

Color inks are often formulated from a wide range of colors. Due to the different nature of pigments, binders, and fillers in different inks, it is inevitable that different substances in the ink will be precipitated and suspended. Once this state is apparent, Existence will inevitably result in the variation of the ink color of the printed product. Therefore, the ink in the ink fountain should be frequently used in the printing process to prevent the ink from being precipitated and suspended to ensure that the ink color of the product before and after printing is consistent. In addition, due to the reduction of the amount of ink in the ink fountain, it is easy to make the gap between the ink fountain steel sheet and the transfer iron roller smaller, thereby reducing the ink output amount and making the ink color of the print product fade. In order to avoid this from happening, it is also necessary to pay attention to adding ink regularly during production so that a certain amount of ink is always maintained in the ink fountain.

Local ink shading adjustment in the lateral position of the print

Due to different layouts of printed products, such as horizontal layout of a section of text, webbing, and lines, the amount of ink suction is relatively small, and the corresponding ink steel adjusting screw can be screwed in, so as to reduce appropriately. The amount of ink delivered to this site. If the position of a certain section of the horizontal layout is field-based or plate-based, the amount of ink is relatively large, the corresponding adjustment screw should be twisted outward to increase the amount of ink, so that the full-page ink color can remain uniform and prevent the problem of printing color. appear.

Full-page ink adjustment

Ink fountain ink to increase or decrease the total amount of ink, there are two ways to adjust, the first by adjusting the ink fountain steel and transfer ink (to ink) iron roller gap to achieve; second is to adjust the transfer of iron roller Turn the arc to achieve the size. In the case of a thin ink, it is not appropriate to adjust the gap between the steel sheet and the iron roll so as to prevent the ink from causing ink unevenness or color miscellaneous defects. When adjusting the amount of ink, the rotating arc of the transfer roller should be controlled within 1/2 of its adjustment range. This can allow the ink to be flexibly adjusted during the printing process to mutate and mutate to prevent ink from being printed. Inconsistent ink.

Correctly adjust and use ink to prevent the production of color difference

Scientific and reasonable use of ink is an important part of guaranteeing the quality of printed ink. The ink of printed color products is too thick or too thin, which is not conducive to uniform ink and ink. In general, when the temperature is low, the ink is thick and its flowability is poor, which easily causes poor transfer and uneven distribution. According to the characteristics of the printing product, the auxiliary agent should be used to properly dilute the ink so as to keep it good. Liquidity and transfer effect to maintain uniform ink. If the ink tone is too thin, the ink will fade. Adjustment of ink flow, should fully consider the characteristics of the printer speed and ink structure, if the printing machine is too fast, the ink path is long, ink roller, then due to the large coefficient of friction, the ink is easy to thin and fade, so deployment Ink should fully consider the above situation and reasonably adjust the printability of the ink. In addition, when blending color and double color inks, we should try to avoid mixing the inks with large specific gravity, so as to avoid the ink on the ink fountain due to the difference in the specific gravity in the printing, resulting in “layering” (precipitation and suspension) resulting in printing and color aberration. .

Turn off the process technology and prevent the production of color

When printing, if the operation and technical measures are not in place, frequent stoppages occur in the production process, which is very likely to cause printing and color difference. In order to avoid this situation, first of all, we must pay attention to the reasonable maintenance of the machine. We must normally maintain the feeder parts and the air pump to ensure that the mechanical parts are kept in a good state of use, so that the air path can be unimpeded, and the printed sheets can be smoothly conveyed. According to the thickness and size of the printed sheets, Feida, the air pump, and the parts related to the paper feeding are adjusted to ensure that the printed sheets are normally conveyed; and thirdly, the printability of the white paper must be adjusted as necessary, such as by shaking the cardboard. With the kneading process operation, the paperboard can achieve the effect of penetration, so as to eliminate the adhesion and adhesion phenomenon, and make the paperboard reach flatness, which is conducive to smooth paper feeding, and at the same time can better avoid empty sheets, multiple papers, and skew failures. Occurrence; Fourth, to make a good pile of paper for technical clearance, the paper pile is not smooth, should take measures to flatten the treatment, so that there is no obvious height difference. Through this process and technical measures to control the control, so that the continuity of the paper to prevent printing caused by parking color.

In summary, the quality problems of whiteboard printing are various, there are a number of undesirable factors, and there are also several defects. As long as we carefully analyze and summarize the experience of the production process, the printing technology and printing operation , not only can better prevent the occurrence of printing quality problems, improve product quality, but also can effectively improve production efficiency.

(Author/ Kang Qilai)
Information Sources Corrugated Boxes 2005. 9