Floral paste in lithographic offset printing
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The dot of the plate image is not shrinking properly. Spreading. Blurring, called the paste version. In fact, they are a pair of faults in the opposite form - the flower plate and the paste plate. This type of fault is also the most common in lithography. The phenomenon.
I. Flower Edition
When printing at the outlet, the printing plate is reduced. The emptiness disappears, it is called the flower version. The small lines on the printing plate. The text disappears, also called the flower version. When the flower version occurs, the high-profile fine mesh will soon be lost. In the field In the printed products, the phenomenon of whitening due to the destruction of the base oil-based foundation is also called the flower version.
The main reason for the flower plate is the fountain solution and friction.
1. The first refers to the amount of dampening solution and the acidity of dampening solution. The amount of dampening solution is large, which causes the emulsifying weight to increase, which will reduce the dot size, the fine mesh point is lost, and the flower plate is produced. The dampening solution is acidic and will produce similar result.
2. The friction of the printing plate is derived from the contact between the water roller, the ink roller and the blanket. The friction depends on the parallelism between them. The pressure and the surface condition. The friction of the printing plate is mainly determined by the friction. The water roller, as well as the blanket and the printing plate, have the greatest friction. If the paper is out of powder during the printing process, the friction will be exacerbated.
2. Paste
The characteristics of the paste plate are: the layout dots expand and deform, and they adhere to each other, making the layer of the print ambiguous. It is mainly reflected from the low-key part of the image.
There are many reasons for the production of paste, the main reasons are in water, ink and pressure.
1. The control of the water delivery system is closely related to the paste. The water supply is small, the ink is easy to expand, and the dot spreads, which can cause the paste. The small amount of bulk is increased, the ink emulsification is aggravated, and the paste can also be caused. The emulsified ink is poor in oiliness, so that it floats freely to the fountain solution. It first expands outward at the low-key point to form a paste.
2. Too much ink is one of the basic reasons for the paste. Because the amount of ink will cause the dot to expand, over time, it will form a paste. Too thin is also the cause of the weight of the paste. Thin ink flow Too big, after extrusion, it produces a paste phenomenon.