Precautions for the most popular business card off

2022-08-12
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Precautions for business card offset printing machine

I. preparation before printing

before printing, adjust various printing parameters of the printing machine and handle the paper well to facilitate the next formal printing

first, adjust the size of the paper inlet of the paper feed baffle to make the paper in and out smoothly. Although the paper inlet of the machine has been positioned before leaving the factory, due to the difference in the size of the rough edges of the paper during cutting (the paper cut out by the sharp edge of the paper cutter is better, and the rough edges of the paper cut out by the slow edge of the paper cutter are larger, which increases the thickness of the paper), so when the rough edges of the paper are larger, it is necessary to check the paper inlet. After the paper pieces are padded on both sides of the paperboard, Take a piece of paper that cannot be used for area joint printing and put it into the paper inlet, so that the paper can pass smoothly with slight friction

check whether the pressure of the plate backup roller is moderate. Generally, the ink line between the plate backup roller and the main ink leveling roller and the PS plate should be 3mm. If the ink line width is bad or uneven, it should be adjusted. If the size difference of paper cutting is large, the paper should be classified

with the above preparations, you can start printing

II. Printing

adjust the plate thickness, paper thickness, paper width, inking, watering method and size according to the situation

to print a good print, the control of ink is very critical. If the pressure between the ink rollers of the machine is adjusted evenly, there will be no problem with the uniformity of the ink. The next step is the skill of water control

how to control the water in the best state, first introduce several factors that affect the water volume on the printing:

1 If the temperature is high, the water control volume should be increased by

2 Ink consistency "experiment - improvement - retest", the water control volume should be reduced

the temperature is low, the water control volume should be reduced, the ink dilution should be increased

3 If the ink volume is large, the water control should be increased D. if the humidity is large, the water control should be reduced

if the ink volume is small, the water control should be reduced and the humidity is small, the water control should be increased

4 With the increase of printing speed, the water control volume should be slightly increased, the paper has good water absorption, the water control volume should be increased

the printing speed should be reduced, the water control volume should be slightly reduced, and the water control volume should be reduced

when preparing to moisten the plate before printing, it is best to add a little moistening concentrate suitable for the water ink mixing machine, and keep the pH value of the water at (slightly acidic), so as to ensure the good moistening performance of the moistening water and the best saturation of the printing ink color. In the process of printing, we should also pay attention to the surface of PS plate and the printing effect, and adjust the water volume in time to maintain the best water volume

when printing a large amount of pictures and texts or printing a large amount of ink consumption, the ink bucket should be used to automatically add ink, so as to ensure sufficient ink volume and maintain the consistency of ink color of prints. This is also very important. If the color difference of the same batch of prints is large, it is obviously unqualified. Although the automatic inking is set, if you want to keep the ink color consistent as much as possible, you should also carefully observe the ink color of the print during printing, check the thickness of the ink line between the ink rollers, listen to the sound of the ink sticking when the ink roller rotates, and make fine adjustments in time to ensure the complete consistency of the ink color

(4) maximum load elongation and breaking elongation

for solving the problem of paper sticking to blanket when printing large color blocks, analyze the reasons:

1, the viscosity of ink is too large

2, whether the printing pressure is too large

3, whether the printing speed is too fast

4, the direction of printing pictures and texts

first, the ink should be properly treated, such as adding an appropriate amount of inking oil and viscosity reducer to reduce the viscosity of the ink. If there is no viscosity reducer, a small amount of starch can be added to mix evenly with the inking oil, which can also reduce the viscosity of the ink. Secondly, check whether the pressure of the printing plate should be reduced, and reduce the printing speed at the same time. Pay attention to the hanging direction of the printed text. The side with light ink or small color block in the text should be in front of the printing. If you pay attention to these matters, you will solve the problem of sticking paper

the repeated overprint accuracy of general business card offset printing machines is 0.02mm, which is the highest in China and reaches the international advanced level. There are several reasons for inaccurate positioning in actual work: 1. The accuracy of paper cutting is too poor. 2. The paper inlet is not adjusted properly. 3. The pressure of the printing plate is too large. 4. The carton baffle and the platform are not locked, resulting in displacement. 5. The carton baffle clamps the paper too tightly. After analyzing the causes, the problem is solved. As long as you pay a little attention, you can completely eliminate the phenomenon of inaccurate positioning

a good offset press is the foundation of printing, but to print beautiful prints, we need to rely on the correct operation of users, the improvement of printing technology and the accumulation of practical experience. In addition, we should also pay attention to the maintenance of the machine to keep it in good condition

information source: Spark design

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