Why is there a problem that the PS version is not high enough?
The PS version is a pre-coated photosensitive material. Printing is composed of many links, and every step must be strictly operated to ensure the quality of printing. There are many reasons for the poor printing durability of the PS plate. The printing conditions of each printing factory are different, such as: running light (before exposure, before development); the density of the positive film is insufficient; overexposure; drug attachment; using PS plate A strong plate cleaner and roller cleaner are used in the cleaning agent; the printing pressure is too large; the paper powder and the like may cause a decrease in the printing durability.
The main countermeasures for treatment are to use yellow safety light to fully shield the harmful light; to reproduce the positive film (density above 1.5); to develop under standard conditions; to arrange the appropriate developer, pay attention to the development time; do not use inappropriate drugs Reduce the number of wiping; use a softer cleaning agent; adjust the printing pressure and so on.
What is the reason for the illusion after the printing?
The crease of the layout can be started from the printing machine and the printing conditions. The main reasons are: the dirt on the glass of the printing machine, the foreign matter or the dirt on the film; the collage of the positive film is not proper; the picture of the positive and the PS version The vacuum tightness is not enough; the pad of the printing machine is not suitable; before exposure (when punching), or after exposure to development before development; overexposure (liquid temperature is too high, time is too long, liquid concentration is large);
The solution is as follows: clean the glass or the film with a cleaning agent; remove the film from the image part by more than 3 mm; confirm whether the film is close to the PS plate, and then expose; adjust the pad to make it flat; in safety light Work. Be careful not to add too much replenishing solution to prevent the developer from being too rich. You can also try Fujifilm's powdered surface products to effectively solve the above problems.
Why is there any residual unexposed film on the PS plate after development?
The printing factory has experienced this situation to varying degrees. The main reason is that the activity of the developer has been reduced and it has not been replenished in time. After exposure, the PS plate is provided with dirty spots and foreign matter, which hinders development.
Precautions:
First, increase the concentration of the developer,
Second, properly extend the development time,
Third, increase the developer temperature,
Fourth, replenish the developer in time,
Fifth, prevent the backflow of the rinsing liquid in the developing machine.
Just pay attention to the above five points, you can develop the ideal PS version.
After the revision, modify some of the dirty, how to deal with it?
Analysis causes the cause of this problem, there may be the following:
1. Insufficient alteration. Among them, the amount of correction fluid is small, the moisture of the plate is not dried, the modification time is short, and the correction fluid is changed to xxxx (open cover storage), etc., which will cause insufficient correction.
2. The coating time is too long and the hydrophilic layer is destroyed.
3, change the tip of the pen dirty
4. After oiling, the oil repellency is poor and there are rubber stains. The following measures are recommended:
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