First, observe the proofs

The sampling inspection in printing. Shortly after entering the official printing, identified in the press the quantity of ink, water how much will some changes should be frequent sampling inspection, re adjustment. Keep unchanged in the printing speed, the quantity of ink and water are in a stable state, sampling check per 500~1000 / time ratio of india.

With the warning note. Officially printed, for failure, as a mark should be warning note of sandwich slender, to facilitate in the process are examined.

Two, pay attention to the change of water

The formal beginning of printing water change notice. Try printing the content and formally entered the printing on the water, how many will be some changes, be sure to side to observe the proofs have no ghosting, water carry the son, while attention to mediation of the plate to the water.

Pay attention to changes in the process of the official printing water. Should pay close attention to the ventilation machine body heat and the workshop in the Sheung Shui to bring the influence, alcohol dampening to pay attention to wetting system cooling device, the control of wetting fluid temperature, Sheung Shui, too, will make the printing plate up dirty; Sheung Shui, too much will cause the ink emulsification, will bring a series of problems. Such as printing paper expansion and dull, misregister, delay ink drying etc..

Three, pay attention to the change of ink

The attention of the ink fountain. The ink fountain came from the gap between the ink roller and ink scraper, is made of ink was squeezed out of the natural weight. Therefore, how much amount of ink in ink, directly affect the output of ink. So, we should pay attention to keep a certain amount of ink in ink. In addition, the printing ink with thixotropic properties. Placed in the ink fountain is longer, the liquidity will gradually becomes poor. Therefore, often with an ink knife in the fountain in the mixing, or install ink agitator.

The ink on the machine to prevent drying. Long time such as eating, stopping to rest, the surface of the ink will ink rollers and the ink fountain dry. Can be used in spray drying inhibitor to prevent drying at.

The note ink evenly, print density depending on the water, at room temperature, the machine speed changes. Compared with the standard should always check proofs. Pay attention to prevent the emergence of the phenomenon of uneven ink.

4 maintain wetting liquid pH value, ink add auxiliary agent, vulnerable to the impact of a wetting liquid pH value, such as the pH value increases, easy to cause the printing plate dirty. Therefore, in order to pay special attention to.

Four, pay attention to the back rub dirty

On the back rubbed against dirty is due to the ink dry slowly, ink layer too thick, paper smoothness high, the sheets on the surface of the ink stick to a printed sheet on the back of the phenomenon.

Five, pay attention to double fault

The so-called ghost image is wrong with a piece of plate printed shift, can see the double and three heavy image on a sheet. Heavy shadow for a variety of reasons, such as paper, Diao tooth, drum, blanket, printing speed, ink viscosity factors is very complex. Can we use the following methods to examine the causes and treatment.

The printed two times, observe the overprinter precision, on the side syndiospecific La force, paper, paper roller and the paper pressing parts inspection regulation.

Check the tension of the new blanket, blanket easy relaxation, attention again tightening, but it can not be too tight.

Check the cylinder lining and printing pressure.

Check the paper printability. Paper suitable, especially in its mouth parts wave paper, prone to ghosting, so to check.

The lower the viscosity of the ink. Ink viscosity is high, the paper cannot successfully stripped blanket, so that the paper drag and shoot some instability, resulting in heavy shadow. May be appropriate to reduce ink viscosity.
The regulation of its teeth. The bad regulation and improper maintenance of the teeth is a major cause of the heavy shadow. Therefore, it should be regularly carried out in the regulation and maintenance of teeth to check, so that often maintain a good working state.

Six, pay attention to check the situation of printing

Continuous removal of 20 to 30 pieces of printed matter, Chuang Qi will be the edge of the paper twisting off a bit, before the inspection gauge and the gauge side whether accurate positioning can be overprinted examination.

Seven, pay attention to other work

Supplement, stirring and wetting liquid of ink.

In addition to dirty work. Because of the adsorption of ink peels, paper powder, paper wool, stolen goods on the printing plate or blanket and reflected in the paper, it is necessary to carry out in addition to the dirty. In addition to the dirty work should be carried out in general. Unless there is a device capable of removing dirt at run time. It is absolutely forbidden to use the hands to remove the dirty.

The cleaning blanket, wiping and dispensing operation. When the blanket on the accumulation of ink and paper powder, dusting powder and the influence of ink transfer must be shutdown to clean the rubber blanket, operation should pay attention to safety. The wiping and dispensing operation should also be Caution.

Note the abnormal phenomenon of printing machine. Pay attention to the sound, heat, vibration, smell, etc., when the machine is running, always check the current meter, pay attention to the abnormal situation of the printing press.
Eight, pay attention to confirm the impression
Printing will end, it should confirm whether the single print is consistent with the production of construction. There is a lack of need to fill in the printing of the production management should be notified in a timely manner to arrange for printing.