Analyze the cause of the failure of the offset printing ink

In the offset printing process, due to the paper's sizing pore structure, smoothness, absorption, viscoelasticity, etc., the paper is filled with filler, rubber, and pigment particles in the papermaking process. The appearance quality of the paper includes dust, spots, fiber clusters, sand particles, etc. The quality is poor and stack failures often occur. There are many reasons for stacking, such as paper removal, paper stripping, piles of blankets, and paper dust. The reasons for paper stacking are different and the solution is different.

1, in the process of offset printing paper piles appear failures, mainly due to paper surface fiber structure caused by loose hair caused by hair removal, this phenomenon is mainly due to poor printing quality of the paper, the fault surface is imprinted ink The surface of the paper is confusingly white, and the paper detachment causes the surface of the printing plate and blanket to be covered with paper. In severe cases, the printing plate and the eraser need to be scrubbed once for every 1,000 sheets printed, causing print quality problems and delaying the production progress. delivery time.

Paper positive and negative hair removal is a technical problem in papermaking and papermaking processes. Offset printing is performed by indirect printing using an intermediate elastomer rubber roller. During the offset printing process, paper hairs are transferred from the surface of the blanket to the printing plate. With the increase in the number of times, the pile of paper that remains on the surface of the printing plate will also accumulate, resulting in the failure of the stacking of the paper, which will stick to the surface of the printing plate impression surface, thus affecting the quality of the printed matter.

The paper fiber paper and paper ash on paper have both water absorption and oil absorption. When the printing plate absorbs the paper, after the plate cylinder transfers, it first encounters the water roller and the water roller is wet. There is a certain pressure on the printing plate. After the paper wool is wetted and pressed by the water roller, most of the printings are closely attached to the printing plate graphic, and then the ink roller is applied with ink. At this time, the moistened paper has oil repellency. Although the ink is absorbed by the four ink rollers, the ink cannot be absorbed, and the ink is transferred to the blanket and appears white.

It can be solved by the following methods. In the first aspect, the balance of ink and ink is mastered during offset printing. Under the premise of a dirty version, the layout moisture is reduced and the pressure of the water roller on the plate layout is reduced. The second aspect is to increase the fluidity and viscosity of the ink, add a small amount of varnish, print the product with less ink, and increase the pressure of the ink roller on the plate surface, mainly the paper on the plate. When ink is applied to the ink roller, the paper is pulled out and transferred to the ink roller, which accumulates mainly on the ink roller. In addition, adjust the printing adaptability of the ink, and add the ink-changing oil and auxiliary materials to be mixed repeatedly. You can also increase the amount of ink in the ink fountain to solve the problem.

2, the paper surface caused by de-powdering presents a honeycomb-like starry sky, which is caused by the shedding of countless fillers, rubber materials, color materials, and auxiliary materials. It seriously affects the quality of printed products, and printing of about 1,000 sheets requires scrubbing. The causes of the printing plates are similar to those of paper piles, but the solutions are different. The proportions of paper and silty are different, and the paper area is light and heavy, and the powder is very fine and heavy. It can be solved by increasing the fluidity of the ink, adding a relatively dilute ink in the ink, increasing the viscosity and the amount of ink, increasing the amount of ink stored on the ink roller, and deepening the ink color of the ink. In addition, printing ink can be printed on the plate. Increase the thickness of the liner below to increase the printing pressure.

3, the pile of paper on the blanket, in the printing process may appear off the paper off powder, and piled up on the blanket, the impact of the blotted ink network, the correct transmission of images, paper on the paper gray, paper powder will Through the rubber, plate cylinder, through the ink roller to the inside of the ink tank groove, thus affecting the transmission of the ink path, encounter paper powder falling out of the paper, printed in the ink fountain is the paper gray, paper hair, paper powder, At this time, the amount of ink is at its maximum, and the ink color of the ink is also pale and light. At the time when 1,000 sheets of white paper are stuck on the blanket, it is necessary to scrub the blanket. These problems can usually be dealt with by washing the blanket. Prior to the official printing of the paper, a white oil and clear water were overprinted to make up for the lack of paper off powder. White oil is a white, translucent emulsion that can be used to dilute the ink, reducing the viscosity of the ink and providing a uniform color. Add a small amount of release agent to the ink, do not add smooth and smooth coated paper, do not overdosage, and do not exceed 3%. Add 0.05mm thick liner paper in the blanket cylinder, or adjust the center distance to increase printing pressure .

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