How to extend the life of the needle
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With the development of China's economy, domestic gravure printing companies have adopted electronic engraving processes in printing plates. The quality of the engraving needle directly affects the quality and cost of the plate roll, so how to improve the life of the veneer has become a matter of great concern to many plate making companies.
Usually an engraving needle is made up of a knife holder, glue and synthetic diamond, of which the quality of the diamond is particularly important. Many diamond products grade the quality of the engraving needles because of the different qualities of the diamond. Like diamonds, the diamond on the needle can be divided into several aspects: the color, the better the quality of the diamond, the color should be the higher the transparency; the lower the transparency, the worse the diamond quality. Surface cracks, a qualified electric engraving needle, its surface must not have any flaws. When the electro-engraving needle is engraved in a dense solid pattern at high speed, a little flaw in the electro-engraving needle may cause cracking of the diamond. However, this situation is not common at home and abroad. However, the electric engraving needles produced by the major diamond products factories in China usually have the following problems in terms of glue.
1. The glue is not strong. It may be due to the glue formula or the production process. The domestic engraving needle is very easy to appear in the production, the needle is peeled off, or the part of the diamond is gently pinched by the finger. The carving needle is absolutely unqualified. needle. In the production, there will be no difference in the hardness of the same root plate, and the engraved dot will gradually become smaller; or the engraving dot suddenly becomes several times smaller than the normal dot when engraving. This shows that this needle is likely to have diamond shedding due to the weak glue. If there is a problem with a stencil, it is likely that the same burr will appear in the same batch of burrs.
2. After many times of grinding the broken needles, many diamond products factory saves time and is easy to use. In order not to loosen the diamond in the engraving needle, the diamond part of the engraving needle is moved backwards and then fastened with glue. Way. But this is likely to cause another problem, that is, when you put on such a needle, it is very likely that your knife holder has withstood the plate roller and the needle still does not touch the plate roller.
As for the tool holder mountain, its production process is simple, and it has not been discovered recently that it may reduce the life of the needle. But a good needle does not prove its long life, there are many reasons for injection and wear.
Causes of copper plating: In actual production, the cause of rapid wear of needles or needles is electroplating. For example, there are too many impurities in the copper plating tank, and the copper layer is too thin. The copper rods which are plated have blisters, pores or plating. When the current is too large, the surface of the plate roll is rough, the ratio of the syrup is unreasonable, and the iron ions are too much, so the working environment of the copper plating room must be kept clean. The operation should be strict and careful, to ensure that there is no leakage at the seam, and the hardness of the plated plate should be kept at 180-220hv. I personally think that the hardness of 208hv is a good hardness condition for the needle. .
Reason for electric engraving: When installing a new knife, first determine that the needle is between the scales of the longest horizontal line. When the broach adjusts the slippery foot, make sure that the position of your slipper is in front of the knuckle. There are many electric carving operators who ignore the influence of current value on the life of the needle. This phenomenon is very common. There are two values in the current value that affect the dicing needle. One is the dark current value, and the other is the oscillating frequency current value. One current value complements each other. The dark current value is too small, indicating that the burr is too close to the plate roller, and the smaller oscillating frequency is easy to cause the injection phenomenon; and if the dark adjustment current value is too large, the burr is too far away from the plate roller, and the large oscillating frequency is likely to cause rapid Wear and tear phenomenon. The best current value number should be the middle number of the dark controllable range.
Cause of the roll: In addition, the material of the plate roll is too thin, and the concentricity is not enough, it is also the reason.
If you avoid the above factors, I believe that the life of the needle will be greatly improved, and the production cost will be reduced.