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Why does the PS version have a low printing resistance?
The PS version is a pre-coated photosensitive material. The printing is composed of many links, and each link must be strictly operated to ensure the quality of the printing. There are many reasons for the poor printing durability of the PS version. The printing conditions of each printing plant are different. The use of strong plate cleaning agent and cylinder cleaning agent in the cleaning agent; excessive printing pressure; too much paper powder, etc. may cause a drop in the printing durability.
The main countermeasures for treatment are illuminated with yellow safety lights to fully block harmful light; remake the positive film (density above 1.5); develop under standard conditions; configure appropriate developer, pay attention to development time; do not use inappropriate drugs ; Reduce the number of wiping; use a relatively mild cleaning agent; adjust printing pressure, etc.
What's the reason why the page becomes fictitious after printing?
If the layout is false, you can start from the plate-making machine and the conditions of the plate-making. The main reasons are: there are dirt on the glass of the plate-making machine, and the foreign matter or dirt is attached to the film; Vacuum tightness is not enough; the liner of the printing machine is not suitable; before exposure (when punching), or after exposure to development before running out; over-development (over-high liquid temperature, long time, high liquid concentration), etc.
The solutions are: clean the glass or 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 version, and then expose it; adjust the liner to make it flat; in safe light Next homework. Be careful not to add too much replenishment solution to prevent the developer from being too concentrated. You can also try Fuji Xingguang's powdered matte products, which can effectively solve the above problems.
Why is there still unexposed drug film on the PS plate after development?
Various printing plants have 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 has dirty spots and foreign objects, which hinders the development.
Precautions:
First, increase the concentration of the developer,
Second, extend the development time appropriately,
Third, increase the developer temperature,
Fourth, replenish the developer in time,
Fifth, prevent backwashing of the developing solution in the developing machine.
As long as you pay attention to the above five points, you can develop the ideal PS version.
After revision, how to deal with dirty parts?
Analyzing the causes of this problem, there may be the following:
1. Insufficient correction. Among them, the amount of correction fluid is small, the moisture of the plate is not dried, the correction time is short, the correction fluid becomes xxxx (opened and stored), etc. will cause the problem of insufficient correction 2. The correction time is too long, the hydrophilic layer is damaged Dirty nib 4. Poor oil repellency after correction, with glue marks. The following measures are recommended:
Use a pen tip to make up for the revision liquid. Before the correction, remove the water from the plate surface. The correction time is 30 to 40 seconds, and then wash with water. Cover the cover when using it 5. After alteration and washing, apply the PP-I type PS protective glue (manual) or PP-IIxxxx type PS protective glue (machine use)
What should I do when the photosensitive layer peels off or detaches?
Analyzing the causes of this problem, there may be the following:
1. Scratches and scratches caused when using the PS version 2. Scratches and scratches caused under pressure 3. Store the PS version in a vibrating place 4. Wipe the surface with a cotton cloth etc. 5. Developer concentration Too high recommended the following measures:
Be careful not to rub the surface of the PS plate; the PS plate holder should not be placed in a place with vibration; the concentration of the developer should be appropriate.
What should I do if the ink is not good at the beginning of printing?
Analyzing the causes of this problem, there may be the following:
1. The specified glue or glue solution is not used too thick 2. The glue is uneven 3. The drying temperature is too high 4. After the glue is applied, it is exposed to strong light 5. After the plate-making is stored in a high temperature and high humidity environment, the following measures are recommended:
Hand-gluing should be smooth and dry. Set the drying temperature to below 60 degrees to prevent light exposure. Do not store in a high-temperature and high-humidity environment.
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