PS version purchase tips

PS version as a major printing plate, in the purchase should pay attention to what the problem? What basic performance should the PS version meet?

The purchase of the PS version is a key link because the quality of the PS version itself fundamentally affects the quality of the plate. Mr. Zhang Bo believes that the PS version should use brand products with a certain degree of popularity. It is necessary to check whether the sand grain processing of the PS version is satisfactory or not in the purchase. It should also pay attention to whether the dot reproduction and the resistance force can meet the requirements. It is generally believed that when purchasing the PS version, attention should be paid to selecting the PS version that requires printing, good developing performance, accurate cutting size, good dot reducibility, high printing resistance, good ink balance during printing, and difficulty in getting dirty.

PS version in the handling and storage and transportation should pay attention to what the problem?

Mr. He Jianchuan mentioned that the PS version should not be handled rough, and should not be stamped on the PS version. The number of stacking layers should not be too large, and it should not be bent. When holding (especially a single version), both hands must hold the two corners of the PS plate. , Be careful not to bend the plate, do not allow the PS plate to collide with the machine or other hard objects to avoid scratching the photosensitive sand surface of the PS plate.

The printing quality of the PS plate has a lot to do with the printing and developing operations. What should you pay attention to during the printing and developing process?

When printing, it is necessary to master the best photosensitive time of the PS version, and to fully understand the PS version of the performance indicators. When developing, the developer concentration should be moderate, must not be too strong, resulting in the loss of graphic and text; or too light, the development is not transparent, the bottom black when printing; the development speed should also be moderate.

Why does the PS version dot often appear in the printing process that is not true, does not reflect the subtle part of the image, and the blank is not clean? How to solve?

There are three reasons why the dots are not true: the PS plate has no vacuum gas-guiding layer; there are dust, dirt, etc. between the plate-making film and the PS plate; there are problems with the plate-making film.

The main reason for the loss of the subtle part of the image is that the exposure time is too long, and the reason that the blank part is not clean is mainly due to insufficient exposure time.

To solve the problem of unrealistic outlets, Mr. Yang believes that starting from checking the quality of the film, the outlets on the printing film should have sufficient blackness, and the outlets on the printing film should be transferred to the printing plate. The covered parts (nets) transmit light, causing the photosensitive layer of the plate to be sensitized.

What is the cause of the layout? What is the solution?

Mr. He Jianchuan summed up several main reasons for the lack of post-printing layout:

1) Insufficient exhaustion causes hair loss. The solution is: to repair the vacuum pump and related parts and components of the printing machine, so as to ensure that the vacuum degree reaches the printing requirements;

2) The edges of two adjacent films cannot be overlapped when they are impositioned, so as not to cause the layout to be false. The solution is: before the sun, check whether the film overlaps, and whether there is any foreign matter between the film and the PS plate.

3) The film film is reversed, or the human misspelling causes the layout to become empty. The solution is: before the sun, check whether the film surface of the film is correct, and whether the film film is reversed during the imposition.

Since different PS versions have different development times and conditions, it is best for users to use the manufacturer's recipes. When selecting a plate, pay attention to the surface quality. When developing, you should understand the type of developer, how to use it, temperature conditions, and other factors. If the temperature of the plate in winter is low, the temperature of the developer is liable to decrease. If the quality of the plate is poor, the plate should be replaced, and the developer should not be used to remedy the problem.

PS printing plate in the printing process, the layout of the non-graphic parts from the dirty, graphic wear and tear, plate scratches on what causes it? How to avoid these problems?

It was learned from the questionnaire interview that the causes of partial wear on the PS plate were mainly caused by the following problems: excessive use of the cleaning solution (emulsion) wipe plate, improper pressure of the printing plate, and protrusion of the blanket.

The reason that the non-graphic part of the layout is dirty is that the exposure time is insufficient, no protective glue is applied, the ink is not balanced, and the ink is emulsified.

Scratches in the plate are caused by accidental scratches due to the unprotected surface of the plate and the plate (upper plate). During the development, the photosensitive layer cannot be completely removed, and the sand spot becomes lighter and the hydrophilicity is weak, which can also lead to dirtiness.