Gold sweeping technology is widely used in the packaging of cigarettes, wine, medicines, cosmetics and high-end food, as well as the printing of greeting cards, invitations, calendars and other products, which can make great progress in the added value of commodities. In the 1990s, China's gold sweeping technology has been developed to some extent. Some regions with advanced packaging and printing (such as Guangdong) have also introduced several gold sweeping machines, mainly used in the production of cigarette packets and medicine packets. With the progress of China's packaging requirements, gold sweeping technology will have greater development.

The processing of the imitation gold effect is one of the effective means for the advancement of commodity packaging. At present, there are mainly methods such as gold ink printing, matte printing, bronzing and gold sweeping. Each method has its own characteristics. Let's talk about the gold sweeping technology.

1 What is gold sweeping technology

The so-called gold sweeping is a process of attaching special metal powder to designated parts on commodity packaging or label printed matter through a special process to achieve a metallic gloss effect. This technology can get realistic metal texture and better gloss, while the pattern is fine and the overprint is correct.

2 Application of gold sweeping technology

Gold sweeping technology is widely used in the packaging of cigarettes, wine, medicines, cosmetics and high-end food, as well as the printing of greeting cards, invitations, calendars and other products, which can make great progress in the added value of commodities. In the 1990s, China's gold sweeping technology has been developed to some extent. Some regions with advanced packaging and printing (such as Guangdong) have also introduced several gold sweeping machines, mainly used in the production of cigarette packets and medicine packets. With the progress of China's packaging requirements, gold sweeping technology will have greater development.

3 Principle of gold sweeping process

The process of sweeping gold is very simple. Put the printed sheets that need to be scanned on a single-color or two-color offset press, apply a layer of sticky adhesive to the parts that need to be scanned with gold, and then print the sheet through the paper feed device to enter the gold sweep. It can be finished by sweeping the gold powder and polishing and knocking gold.

At present, the Jazz brand automatic gold sweeping machine produced in Germany is mainly composed of 5 departments: a paper feeding mechanism, a coating mechanism, a polishing mechanism, a cleaning mechanism, and a paper collecting mechanism. Printable products can be processed from thin paper to paper jam, from four to full sheet, the speed can reach 8000 sheets / hour. When sweeping gold, the gold sweeping machine generally needs a flat sheet single (double) color offset press (removing the paper collection device) to connect with the gold sweeping machine. First, make the special PS version of the gold sweeping machine, install it on the offset printing machine and adjust it. Use the PS version to print a thin and even layer of primer on the parts where the gold powder needs to be printed, and then pass this print through the gold sweeping machine. The paper transfer device is sent to the suction rubber conveyor belt of the gold sweeping machine, and the gold powder is averaged by the coating mechanism and applied to the surface of the printed sheet. When the side of the coating roller that attracts the gold powder turns to the top of the printed sheet, this part changes from suction to blowing, spraying the gold powder evenly on the entire surface of the printed sheet. The four polishers of the polishing mechanism rub and polish the gold powder on the printed sheet, so that the gold powder printed on the printed sheet is firmly adhered. At the same time, the gold sweeping machine also uses 4 special gold tapping belts to make reciprocating movements opposite to each other to improve the metallic luster and adhesion fastness. The latter two have strong suction pipes to remove excess gold powder. The high-vacuum suction multi-pass cleaning cycle system of the cleaning mechanism plus the front suction tube can quickly clean up the excess gold powder on the printed sheet. These excess gold powder can be used in rotation, without causing environmental pollution or spreading. Finally, the paper collection mechanism completes the paper collection and rectification work.

Of course, if the printing factory has a multi-color printing machine and UV drying device, you can perform online gold scanning, that is, print the printed matter in the first few colors of the printing machine, and dry it fully by the UV drying device on the last color group. Print and apply primer, then enter the gold sweeping machine to sweep gold through the connecting device.

4 Features of gold sweeping technology

Gold sweeping technology has advantages in many respects compared with several other gold-imitation processing technologies, and of course there are also shortcomings.

1) Compared with Indian gold

At present, offset printing, gravure printing, flexo printing and silk printing can be used for printing gold, especially offset printing and gravure printing, which are relatively fast. The offset ink layer is thin, and the metal gloss is not very good; the gravure ink layer is thicker and the gloss is better than offset printing, but the metal texture is not strong enough when printing on a large area, and it is easily deformed when printing small prints and small lines, and the quality is not easy to control.

2) Compared with bronzing

As a traditional imitation gold processing technology, bronzing has strong metallic luster and metal texture. It is an indispensable processing technology for some high-end packaging. In this respect, it is better than gold sweeping. Although the quality effect of bronzing is good, but most of it needs? Especially caries? 柘? Mother? 劄 芰 君? Mane plus princes ⒉ locust 菀 祝? Around the stolen stolen ┖ benzyl> resistant to clip Wei pain Zhu bite? Persimmon ash Zhuo Zhuo tired? ひ Barrier wish Cong Sakura? Kill Ju 喽 as fine as possible? 藖 嗍? Milk detective Lili Pu rods under the ?? style system? / P>

3) Compared with matte printing

Frosted printing certainly has better metal texture and gloss, but the production efficiency is lower, and the waste packaging is not easy to recycle, which is not conducive to environmental protection.

4) Strengths of gold sweeping technology

The gold sweeping technique has simple operation process, fast speed, and low cost. No matter the thickness or area of ​​the picture and text, you can get better results.

After gold sweeping, the product has better metallic grit feeling and light diffuse reflection effect, and the metal texture is more real, giving a visually significant three-dimensional feeling, which is different from printing gold and hot stamping.

The colors of gold sweeping are rich and colorful. In addition to the most commonly used gold, there are silver, red copper, green, graphite, tan, lemon yellow, peacock blue, and recently imitation diamond gold powder widely used in Europe and North America. Laser gold powder. These gold powders have different particle sizes and can show a variety of unique effects.

Anti-counterfeiting effect: Because the imitation gold effect obtained by sweeping gold is different from gold printing, bronzing and matte printing, it is unique, not easy to imitate, and has a certain anti-counterfeiting function.

5) Disadvantages of sweeping gold

Although the gold sweeping technology has a very significant advantage, it is not perfect.

The most important feature of gold sweeping is the formation of imitation gold effect in specific parts, but the single gold sweeping process is difficult to achieve the best metal gloss and texture at present. It is not as good as bronzing in some aspects.

It is not as convenient as printing gold on printing sheets that require large areas of imitation gold, and the effect is not superior. Therefore, gold sweeping is only a mid-range gold imitation effect processing technology, which has certain limitations, which limits its rapid development to a certain extent.

The requirements for the environment of the gold sweeper are very high, the temperature should be controlled at 22 ~ 25 ℃, the humidity should be controlled at 50 ~ 55%, otherwise quality problems will easily arise.

Common faults in gold sweeping are sticky and dusting. The main reasons are: â‘  Too much humidity in the gold-scanning workshop or too high water content in the paper will cause the gold wiper to get wet and wipe clean; â‘¡The imprint of the printed matter is not dry, which will cause the gold powder to stick to the parts that do not need the gold sweep; â‘¢The viscosity of the primer on the part of the printed sheet that needs to be scanned for gold is not enough or the glue is not enough to cause powdering.

5 Conclusion

From the above analysis, we can see that the gold sweeping technology still has certain shortcomings, but its advantage is still very significant, especially in terms of anti-counterfeiting, metal texture and advertising effects. At the same time, the cost of sweeping gold is relatively low, and printing manufacturers can obtain higher profits. Although there are few manufacturers using gold sweeping machines in China, with the continuous maturity of gold powder processing technology and gold sweeping technology, as well as the perfect combination with gold sweeping, bronzing and silk screen printing, it will be used in the domestic packaging and printing industry, especially in tobacco Bags, wine bags and high-end medicine, food packaging play a unique role.

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