Offset printing machine and ink viscosity with water, water roller, water and ink viscosity and water roller and bucket roll stick ink two. The former is a sticky ink, the latter is a metal sticky ink. Water roller sticky ink will affect the normal water delivery, serious when will cause a printing plate dirty, paste version, and even product scrap. Water roller sticky ink failure is the most common and difficult to overcome the problem, the specific reasons are as follows.

One, the metal's Pro oil

At present, the series water roller of the offset press is generally chrome plated, and the hydrophilic property of Cr is more than that of the parent. Biden, j2108. J2203, J2204.J2205 type offset press, bucket roll and roll series water roller are chrome plated, basically not sticky, but not at all sticky. Rotation of the bucket roll is composed of teeth go to control, turn slowly, the water surface of the thin film, it is easier to dehydration. If the transfer is more sticky ink water roller, roller bucket is also relatively easy to stick ink, causing water uneven, affecting the quality of products. Therefore, should always wash water roll on roll surface water and ink viscosity, prevent ink accumulation, keep bucket roll and roll on the hydrophilic water well.

Two, Sheung Shui operation is not standardized

How much of the operation method of water water roller flannelette stick ink has a great influence. Because the cloth is made of fibers made by degreasing, though, but still have the lipophilic and hydrophilic characteristics. If the first sticky ink, it is not easy to stick water, so in the process of operation to avoid the water roller to stick ink.

The new water roller machine before, many experienced operators will wipe with a damp cloth. On the one hand to make it on the foot of the water, on the other hand to wipe off the surface of the fiber hair, so that it is beneficial to prevent the ink and hair loss.

Now the general operation method is in the new water roller installed on the machine, first let the machine running, and then to the water roll on the water, the water should be as far as possible. The new water roll Zuiji not enough water on the closed plate, make the roller after falling because the water is not enough to dirty, paste version, cashmere sets have been glued on ink, it is difficult to Sheung shui. If you think of the new water roller idling after Sheung Shui not sure, can fall into the water and then, manually fall rollers, observe the layout, if the layout of water is too small, should immediately lift the roller, and then add water, this operation is not standardized.

Three, printing plate gasket

Some press on both sides of the water roll ink a serious phenomenon, some people think that is the result of two roller of ink emulsification, but careful observation, is actually caused by poor plate gaskets.

If the printing plate in the same size as the printing plate. In the washing, cleaning, etc., will make the liner wet by water. After the immersion of the paper will be deformation and expansion, increase the printing plate and the water roller pressure between the invisible, water roller flannelette when serious collapse, between the same water roll loses pressure, water can not be normal, but will stick ink.

If the printing plate under the liner is much shorter than the printing plate, two ends of the same water roll between the loss of pressure, contact less than water roller, two ends of the ink, and ink will gradually accumulate a very thick. Finally, the accumulation of ink and water roller contact, resulting in serious water roller ends of the sticky ink, and gradually expand to the middle, the impact of water. Then the plate ends of ink viscosity also expands, which ends the vicious spiral, blanket and impression cylinder are filled with ink, produce color mixing two-color machine will malfunction.

Therefore, we should pay attention to the length of a printing plate. General J2108 type offset printing press plate length is 940mm, the length of the liner should be 920 - 930mm. Damaged or soaked in water to fill the dirt of the liner paper should be replaced in a timely manner.

Four, the nature of fountain solution

In the bucket fountain solution not tap water, but by a certain percentage of water and phosphate. Chromate, coupled with a certain amount of hydrocolloids compounded. Very good on the printing plate of the inorganic salt solution formula, so until now many Ty are still in use.

But the problem of water ink viscosity and flannel this formula has not been resolved, mainly cotton fiber after the acid corrosion, become coarse and sticky ink.

In recent years, as the wetting powder printing of specialized production, not only to remove harmful chromate, more important is its wettability and cleaning effect is particularly good. The fountain solution surface tension of new 50% less than the past use of chromic acid red syrup, so we can achieve the best wetting and penetrating effect, at the same time as the surfactant has very strong detergency, can wash the plate and cleaning water roll cloth, water roller flannelette stick ink phenomenon is greatly reduced.

Operator to study the method of maintaining the water roller, so that it is not sticky or less sticky ink, so that it can extend the life of its use.