After the cigarette pack is hot, the printing process is “unique” operation experience sharing!

The so-called hot stamping is a process of first stamping and then printing on the surface of hot stamping. The hot stamping in the hot stamping process is generally a partial hot stamping. The electro-aluminized aluminum used generally has a large contrast with the paper base color, so that the hot stamping portion and the other portions have a sharp contrast. For example: usually in white cardboard, glass cardboard hot stamping gold, silver, laser anodized aluminum, hot stamping laser aluminum on gold, silver cardboard, hot stamping gold, silver anodized aluminum on laser cardboard; printing UV offset printing is generally used.

Hot stamping is a high-tech emerging process that faces more and more complex problems than traditional processes. Especially in the absence of more practical experience for learning, most of the cigarette printing companies that have used the hot stamping process have experienced a tortuous process, and then gradually formed some unique features in the continuous exploration and summary. Experience and experience. Here, the author talks about some experiences based on his practice of hot stamping and printing.

Large area hot stamping

Due to the need to print on the hot stamping surface, the hot stamping part of the hot stamping process is mostly used for large-area hot stamping. Therefore, on the hot stamping equipment, the first hot stamping process is the round round and round flat automatic hot stamping machine . These two devices are better able to meet the large-area hot stamping requirements because of the line pressure. The pressure is relatively balanced and the total pressure is small, which is very suitable for the hot stamping process. However, the limitations of these two types of bronzing equipment are also obvious: the cost of round stamping and stamping is relatively high, and the efficiency of round stamping and stamping is relatively low. Therefore, most domestic cigarette pack printing enterprises use flat-press automatic hot stamping machines .

It is worth noting that in the process of hot stamping large-area field products, it is difficult to discharge the air in time, and it is difficult to adjust the same hot stamping plate when the pressure is uneven. In response to this problem, we must improve from the following aspects: First, the hot stamping version should be able to make appropriate arcs according to “middle height, low ambient” so that the air can be discharged in time during the pressing process; secondly, it should be selected Degree and tightness are suitable for large-area hot stamping, easy to transfer anodized aluminum ; Finally, in the adjustment of the plate according to the hot stamping version of "middle high, four low" characteristics of pressure compensation , commonly known as "Pagoda style bottom", Avoid obvious pressure "faults" at the junction of hot stamping and non-hot stamping, affecting ink transfer and adhesion. Generally, after the first hot stamping and printing, the edge of the hot stamping image needs to be pressed, bumped, or stamped. If a concave pressure pressure is formed, it will directly cause the pressure unevenness and hot stamping. Equal quality issues that are extremely difficult to handle.

Hot stamping

In the hot stamping process, especially large-area hot stamping often requires higher temperature and pressure. It is easy to wrinkle and break the paper during production, and there is a hot stamping phenomenon. In order to achieve the desired hot stamping effect, firstly, the actual production situation should be fully considered in the development and design of the cigarette pack, and the hot stamping area should be avoided as much as possible ; secondly , the paper with higher surface strength and the easy-to-peel anodized aluminum should be selected , otherwise it should be treated. It will get twice the result.

Bad printing

In the process of hot stamping, many times the hot stamping process is carried out very smoothly, but in the printing process, problems such as back-drawing, ink loss, and poor adhesion are frequently encountered.

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