Offset printing maintains its popularity in the packaging printing market. Another important factor is the flexible combination of offset printing and other printing methods-offset printing + sheetfed gravure printing, offset printing + screen printing, offset printing + sweeping gold, etc. Promoting strengths, avoiding weaknesses, and complementing each other's advantages, even if people who love offset printing find more reasons to love it, it also provides more means of highlighting personality for packaging users who are keen to pursue new and different.
With the acceleration of people's pace of life and the improvement of their living standards, the requirements for product packaging are also constantly increasing, a large number of new products have emerged, and the pace of product updates has also accelerated. This means that people's requirements for the exquisiteness of packaging and the quality of packaging printing will become higher and higher, and the variety of packaging will increase greatly, but the batch will not change much or even decrease.
This changing trend requires flexible high-quality printing methods to suit it. In other words, there is a need for a printing process in the market that has short production cycles and can print beautiful color images. For this, offset printing is not only a good choice, but also an inevitable choice in many occasions. Especially in China, offset printing has become very popular, and the quality of offset printing has become the default standard for many packaging users and consumers; moreover, the offset printing press has a large inventory and a good hardware environment (equipment, supplies, spare parts supply ...) And software requirements (technical talent, maintenance ...). It can be said that the development of China's packaging and printing market is inseparable from offset printing, both in terms of the use of resources by the seller and the needs of the buyer. The large number of imported multi-color offset presses in recent years has also confirmed this. According to the introduction of several international offset press suppliers, most of the sheet-fed multicolor offset presses introduced in China in recent years are used for packaging printing. Especially in the Pearl River Delta and Yangtze River Delta regions, although many large and medium-sized packaging and printing companies have introduced web gravure printing machines and flexographic printing machines, offset printing is still one of the main projects, or used for printing small and medium batch packaging. Products, or combined with other printing and finishing processes, used to print fine packaging.
Offset printing's ability to reproduce the subtle levels of images is amazing, especially the transition of gradient colors is very soft and smooth, which is unmatched by any other printing method. However, the offset ink layer is relatively thin, and there are still problems of water-ink balance and ink emulsification. Therefore, even when printed twice, it is difficult to achieve full, uniform and consistent ink color. In the design of packaging , the application of solid color blocks and spot colors is very common. In order to make their products unique, many packaging users usually use four-color printing and spot color printing. At the same time, gold ink, silver ink, Pearlescent ink or varnish. For such packaging, if pure offset printing is used, the effect of spot colors and gold or silver printing will be greatly reduced. This undoubtedly poses a problem for offset printing.
In order to make up for the shortcomings of offset printing, in recent years, the combined printing process of single sheet gravure + offset printing has been highly respected. This combined printing process uses the advantages of thick gravure ink layer and stable ink color to print large areas of solid and spot colors, gold and silver, pearlescent color blocks, and even produces a variety of imitation metal etching effects; the characteristics of delicate offset printing and smooth transition Print halftone images and gradient patterns. The two printing methods complement each other and complement each other.
Compared to offset presses, the advantages of sheetfed gravure presses are:
1. 4 times more pigments than offset printing, the printing ink layer is thick, the ink color is bright and full.
2. Non-wet pressure wet printing, there is no double image danger, there is no water-ink balance problem and ink emulsification problem.
3. When printing large-area color blocks, the problem of ink color change will not occur, and "ghost images" will not appear.
4. The ink layer dries quickly, and subsequent processing can be performed immediately after printing, which can greatly shorten the production cycle.
5. No dusting is needed, there is no ink accumulation, and there is almost no ink color fluctuation.
6. Offset printing materials that are difficult to print, such as vacuum aluminized paper (gold cardboard, silver cardboard), metal foil, etc., can be printed smoothly with a single concave machine.
7. Gold silver ink, fluorescent ink, pearl ink printing effect is good.
8. Can print imitation metal etching effect. Compared with web gravure printing machines, single-sheet gravure printing machines are very suitable for printing high-quality prints in small and medium batches. Its main advantages are:
1. The printing operation is very flexible, and the preparation time and plate changing time are short.
2. Accurate overprinting, its overprinting accuracy is exactly the same as sheet-fed offset printing machine.
3. Minimal waste. Under normal circumstances, after adjustment of one or two printed products, normal printing can be performed with almost no waste products.
4. Flexible equipment configuration and small investment.
According to statistics from the supplier of sheet-fed gravure printing presses, the installed capacity of domestic sheet-fed gravure printing presses is currently about 200, and most manufacturers have sheet-fed offset presses. They chose a sheet-fed gravure press to work with existing offset presses to achieve a combination of offset and gravure to achieve high-quality, low-cost printing. At present, more than 90% of the bonding process is used for high-end cigarette pack printing.
Screen printing is famous for its thick ink layer and full ink color. In particular, the development and application of various imitation metal etching inks have made screen printing gain an important position in China's high-end paper packaging market . However, it is difficult to reproduce fine images by screen printing, and the production efficiency is low and the reject rate is relatively high.
Combining offset printing and screen printing is the process of choice for many high-end packaging, especially fine cigarette packages. One of the most successful practitioners of this process is Zhejiang Meinung Screen Printing Co., Ltd.
Zhejiang Meinung Screen Printing Co., Ltd. is a modern large-scale joint-venture packaging and printing company. It is mainly engaged in packaging design and printing of high-end premium cigarettes, medicines and other products. Object. In addition to a number of fully automatic screen printing machines and semi-automatic screen printing machines, the company is also equipped with Heidelberg four-color offset presses and Zhenheng sheet-fed gravure presses.
Before configuring the single-sheet gravure printing machine, Zhejiang Meinong used the offset printing + screen printing process. Part of the field printing depends on screen printing, and part of it is printed twice with an offset printing machine; pearlescent inks and spot color inks are mainly printed by screen printing processes. At the same time, special finishing effects such as matte, ice flower, and crystal rely on silk. Screen printing to achieve. Screen printing machine for large-area on-site printing and pearlescent printing, the purpose is to obtain the thick ink color required for fine cigarette packets, and to ensure that the ink color is uniform and consistent.
With the expansion of the production scale, considering the issues of efficiency and effectiveness, after comparing various printing methods, they think that although gravure is not as good as screen printing in terms of color effect, it is better than offset printing. Sexuality is also easier to control, especially when printing spot colors. Therefore, they purchased a sheet-fed gravure printing machine, which is mainly used for field printing and pearl printing.
Because the cigarette packs they print are generally medium-to-high-end products, the price is relatively high, and of course, the quality requirements are relatively high, so special finishing effects such as frosted, ice flowers, crystals, etc., are still achieved by screen printing.
In addition to professional screen printing companies such as Zhejiang Meinong, many domestic packaging and printing plants with offset printing machines are also equipped with screen printing equipment, but the number of screen printing equipment may vary due to different business volumes and different process requirements It's less, the configuration is lower, and some are even equipped with some simple screen printing tools.
But there is no doubt that the marriage of offset printing and screen printing can create high profits for enterprises, so it is very popular and quickly popularized.
Out of the preference for metal texture, people unconsciously use gold and silver when pursuing packaging grades. Therefore, a series of metal effects such as anodized aluminum hot stamping, gold printing, silver printing, and gold sweeping were born. Printing and finishing processes.
Compared to gold printing and silver printing, the metal texture of gold sweeping prints is much stronger, with high gloss and good finishing effect. Moreover, due to the relatively small installed capacity of gold sweeping machines, gold sweeping prints also have better anti-counterfeiting effects.
Compared with anodized aluminum hot stamping, although the metal luster of gold sweeping products is slightly inferior, the gold sweeping machine can be connected behind the offset printing machine. After printing, the gold sweeping process can be completed online, with high production efficiency and low rejection rate. The delicateness of offset printing images and the fullness of gold sweeping patterns give the printed products a noble and elegant style. The combination of offset printing and gold sweeping technology also gives offset printing a new vitality.
In addition to the above-mentioned several combined printing processes, depending on the needs of packaging printing products and the company's own equipment configuration, offset printing can also be combined with various printing methods to form a variety of process solutions, bringing more highlights to the packaging printing market. ,