Common solutions to printing problems in guangzhou printing process

In the process of printing, a variety of failures, generally speaking, rarely caused by a single factor, mostly due to ink, paper, printing press and printing environment conditions are not coordinated, caused by the interaction. Here on the common printing failures, from the point of view of ink solutions, for your peer reference.

1, the dirty

Dirtiness refers to the appearance of many ink stains in the non-graphic area of guangzhou printed matter, which is a common and representative fault in lithography.This phenomenon is much by printing ink, paper, printing plate, packaging and printing potions, and other factors, in terms of ink, ink is usually in a thin, soft, yield value is too high, less sticky situation, to improve the performance of the ink, adding suitable amount of larger viscosity resin ink or light oil slurry, helps overcome the dirty; Ink deployment, desiccant, low viscosity ink oil, to join too much, the ink will be thin, viscosity and small, is an important cause of this problem, ink deployment can be solved properly, for fast solid light ink.

Secondly, uneven sand plate mesh, a grinding material residue, not fat is insufficient, and the feeling of partial oxidation, or lack of development, it is also an important factor causing the dirty, should also be checked and solved, poor printing machine roller is arranged at the same time, the water roller dirty, ink roller rubber aging, rubber cloth is flabby, can also cause the dirty, should be check the adjustment.

2, the thick

Thickening refers to the pigment separated from the ink, piled on the plate and blanket, resulting in printing dot paste.

Under normal circumstances, is the ink water resistance, easy to emulsify often appear this phenomenon. Can add an appropriate amount of high viscosity resin ink, light paste or printing gloss oil, improve the ink viscosity, transmission and water resistance, while increasing the PH value of printing potion, reduce the amount of water, reduce the amount of ink, can improve or overcome this fault.

3, smearing

Squatting dirty, also known as "dirty", "back", guangzhou printing speed is too fast, printed on the paper ink fixation time is not enough or paper pile pressure is too large, ink layer has not dried, ink transfer phenomenon called dirty.

This phenomenon is easy to appear in high speed four-color, two-color printing, the most fundamental measure is to use fast solid light, fast solid ink printing and use powder, adjust and control the amount of powder, in the ink color, concentration allows, reduce the amount of ink, reduce the pressure of printing material accumulation, reduce the amount of water, help to overcome the fouling phenomenon.

4, paste version

Paste refers to the printing process, ink with a very light color, a large area of the appearance in the space of the layout, wipe out and will soon appear in other places.

Paste version of the phenomenon, is generally due to the poor water resistance of the pigment in the ink, ink formula adjustment is improper, to viscosity, low viscosity ink oil dosage is too much, ink deployment too soft, too thin and cause paste version. To solve this problem, one is to choose a good water resistance ink, two is to adjust the amount of various printing AIDS, to ensure ink water.

5. Paper wool

Printing advanced coating paper, glass paper, matte paper, generally will not appear this problem. If the paper surface rough, poor strength, paper coating adhesion is not strong, ink viscosity is relatively too large, can cause the phenomenon of paper hair, resulting in a decline in printing quality. In this case, to reduce the viscosity of the ink to reduce the viscosity of the ink or switch to the smallest possible viscosity of the ink, in order to make the imprinting ink film easy to split, reduce the printing speed is a simple and economic method, the replacement of good paper is of course better.

6, crystallization

Crystallization, also known as vitrification, the phenomenon of first printing ink drying, then printing ink printing or even printed, dry ink layer is easy to fall off, ink resin after the fast solid light ink, resin offset printing ink such problems are rare, in the printing field or ink layer is too thick, occasionally this phenomenon occurs. The solution is to reasonably master the next color overprint time, in the previous color is not completely dry overprint, followed by the control of dry oil allocation, dry oil is added too much is the main factor to promote crystallization.

7, do not ink

No less than ink also known as ink roll, refers to printed matter striation, color is also relatively light phenomenon.

This phenomenon mainly ink ink is not good, yield value is too high, in ink pigment content too high, the ink silk head are too short and into cheese, ink has gel or water into the ink, caused cause flocculation groove of ink printing ink and ink roll out, not a good pass, encounter this problem, first of all, from the ink on the design to improve the mobility of ink and ink. Secondly, when printing, the appropriate allocation of viscosity of ink oil, improve the liquidity of ink, can help to overcome thixotropy is larger and viscosity, fluidity of ink, often with ink knife stirring ink tank or directly in the ink tank installed a stirrer, can also overcome this disadvantage.

8, misting

Flying ink refers to the phenomenon that when the ink is separated between the rotating ink rollers, the broken ink becomes charged particles due to the relationship of surface tension and is ejected in space by the running printing press.

Flyink phenomenon with the roller ink layer thickening, printing machine speed increased significantly, serious pollution of equipment and printing environment and even affect the quality of printing. This kind of phenomenon, mainly the ink viscosity and the speed of the printing press does not fit, generally because of the ink viscosity, long silk head, ink and soft. Ink resistance is poor, easy to emulsify when flying ink phenomenon. The solution is to reduce the viscosity of the ink to improve the ink resistance. Choose a hard and high concentration of ink, reduce the amount of ink, roller ink layer thin, flying ink phenomenon will be improved.

9. Drying too fast

Drying too fast is the ink in the ink, in the roller, in the rubber blanket thickened dry knot phenomenon.

This phenomenon is mainly by the ink desiccant too much, ink contains more volatile too fast solvent; Caused by too high temperature, too dry air or too good air circulation in the printing shop. Solution is to add a small amount of vaseline in ink to reduce the conjunctival drying rate; Add a small amount of anti - skinning agent or antioxidant; Don't wait too long for ventilation in the workshop.