Double-adhesive paper printing: analysis and elimination of paste blanket phenomenon
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When printing on the field or large-area graphic products with poor quality double-adhesive paper, the phenomenon of paste blanket is prone to occur, which is a headache for the operator. Paste blanket not only affects production speed, increases labor intensity, wastes raw materials, but also causes quality accidents when not paying attention. Below, the author analyzes the phenomenon of paste blanket caused by various reasons in the work.
1. Printing pressure is too small
The printing process is the process in which the printing plate selectively adsorbs the ink and transfers the ink to the substrate through a blanket. However, due to the addition of paper and paper powder, the transfer of the ink is hindered, so that the ink cannot be smoothly transferred to the substrate and remains on the blanket. The problem of the paste blanket can be solved by appropriately increasing the pressure between the three rollers to force the ink to be unconditionally transferred to the substrate. However, while increasing the pressure between the rollers, the printing durability of the plate should also be considered. When printing large quantities of products, it can be baked to increase the printing durability of the plates.
2. Rubber layout is not flat
If the blanket and the pad are used for too long, unevenness will occur. It is easy to accumulate paper and paper powder in the recessed area, resulting in a partial paste blanket. In the recessed area, rub the reducing agent or use a layer of 1 or 2 layers of transparent plastic tape to adhere to the back of the blanket to restore it to a flat surface. If the problem of the partial paste blanket is still not solved, only the blanket and the liner can be replaced.
3. Poor ink flow
If the fluidity of the ink is not good or too sticky, the peeling force on the surface of the paper will increase, and the paper and paper powder on the surface of the paper can be easily peeled off, and transferred to the printing plate, the ink roller or the ink through the blanket. In the trough, it creates a vicious circle. When printing large quantities of products, it should be cleaned according to the amount of paper and paper powder in the ink roller and ink tank, so as to ensure the printing durability of the printing plate.
Adding an appropriate amount of auxiliary material (No. 6 oil or thinner) to the ink can increase the fluidity of the ink, and then add an appropriate amount of the lightening agent, which increases the liveness of the ink, so that the ink can be transferred to the printing well. On the object, reduce the phenomenon of blanket blanket.
In the above situation, some operators mistakenly believe that adding an appropriate amount of detacking agent can increase the fluidity of the ink, but adding the detacking agent also reduces the liveness of the ink, so that the paste is in the printing plate and the eraser. The ink on the cloth is difficult to clean, and the phenomenon of the paste blanket is not alleviated.
4. Unreasonable arrangement of printing color sequence
If it is a four-color machine, you can put the image with less text and the smaller amount of ink on the front side so that the paper and paper powder remain on the previous one.
The reasons for the blanket are various. The above points are some of the experiences that the author has summarized in practice, and are for peer reference only.