Common problems in offset printing and its treatment

1, the difference between the proofing version and the upper version
In fact, for proofing and printing, two different versions should be printed. For proofing, from the standpoint of the structure of the proofer itself, it generally belongs to a platform type. The pressure of proofing is lower than the printing pressure, and the speed is slower than the printing speed. At the same time, the dot gain caused by proofing is small, and when printing is required, 2% to 3% of the dots are reserved, and 98% of the dots cannot be pasted. For printing, because the printing pressure is high and the printing speed is high, the printing ink is softer than the proofing ink (small in viscosity), which easily causes dot gains, and can increase up to 30% to 40%, so the same plate is used for proofing. And the effect of printing is not the same, and this contradiction has not been solved for a long time. Therefore, when printing, it is required to retain 4% to 5% of the outlets, and 96% of the outlets are free of paste. This leaves room for the expansion of printing dots caused by printing, and the printed products are easily accessible to proofs.

2、Dying phenomenon when printing
In the event of loss of outlets, one should first look at the degree of restoration of the film itself, such as whether the 50% of the dots on the film are square, and whether 4% to 5% of the outlets are complete. In short, check the quality of the photocopied film, and then judge according to it. Whether the outlet is lost during the printing process. Because of the problem of printing operations, missing dots often appear. This has a direct relationship with exposure time, development time, developer temperature, and concentration. Excessive exposure and excessive developer concentration can cause dots on the layout to be lost or text strokes to become thinner. Strictly speaking, the printing staff should control the exposure and development through the printing test strip and the gray ladder, and test out their own test data.

3, the layout of virtual
The reason for prosecution of false printings may be related to the printing film. If the film is exposed when the film is output, it will cause the printing dots on the printing film to become imaginary, and the printed version will naturally become imaginary.

From the operation of the printing plate, it may be due to foreign matter or dirt attached to the glass or film of the platen; or the pad of the printing machine is not suitable; or the vacuum is not true, so that the film and the plate are closely attached. Insufficient; improperly printed copy film; before exposure (drilling) or after exposure to pre-developed lighting is too strong and so on, all may cause the direct printing surface to be ridiculous; and the developer temperature is too high, the concentration is too high, the development time is too long. Excessive development caused by too much developer replenisher is also the reason why the layout can't be ignored.

At this point, the glass or film should be cleaned with a cleaning agent; the liner should be leveled; the tape should be separated from the image by 3mm, and the film should be in close contact with the plate; in safe light, such as a fade-resistant fluorescent light, yellow light Fluorescent lamps equipped with safety lamp shades are used for operations; for unsuitable development problems, they should be performed according to standards.

4, uneven development
Inhomogeneous development or poor development, often caused by the decrease in the activity of the developer, which is mainly reflected in several aspects: the developer solution is not timely; the development time is too short; the developer temperature is too low; backwashing fluid, etc. At this time, in addition to standardizing the development conditions, the developer should be replenished in a timely manner.

In addition, the dirty spots or foreign materials on the plate may also hinder the development. This requires the staff to regularly check the developing machine and the printing machine, and perform a timely cleaning of the machine.

5, the layout of the dirty
There are different conditions on the layout, and there are different causes. The layout is dirty, which may be underexposure. There are two possibilities. One is that the transparency of the film is not good or the film is out of date; the second is that the exposure light source is used for a long time and there is an aging phenomenon. If you encounter the first situation, you can only re-film; if it is the problem of exposure light source, you should use the gray ladder ruler to adjust the exposure time, or directly change the exposure light source. Of course, the poor development may also cause the layout to be dirty. At this time, it is necessary to check out the specific causes of the poor development and timely adjust to the standard conditions.

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Chaohui Salon Equipment Co., Ltd. engages in developing and manufacturing barber and beauty chairs, beds and other products. Relying on its strong technical force and advanced equipment, the perspicacious company aims at the international and domestic barber and beauty chair and bed market. Provided with a group of experienced designers, the company has been constantly improving the product quality, and developed many new ergonomics-based products, including barber chairs,beauty trolley,tattoo trolley,Salon Trolley,facial chairs, shampoo chairs, beauty chairs, massage chairs, massage beds, etc. The development idea of each product comes from the users; each product is comfortable and durable, which reflects the high-tech quality and strict quality assurance of ChaoHui; and each product has been well received since entering market for its noble and unique style and exquisite workmanship.

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