Fast-developing packaging screen printing technology
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Today's Asian packaging market is developing rapidly, especially in China's packaging industry. With the continuous emergence and application of new materials and new technologies, screen printing has shown its unique advantages in today's packaging and printing, and it is playing an enormous role, providing an unprecedented product market with a wide variety of products with unique shapes and special effects. The vast stage.
First, the application of screen printing on the packaging
The high flexibility of screen printing enables printing on the surface of various packaging products to achieve a variety of special effects. Therefore, screen printing technology is very popular in the packaging industry and is mainly used in the following aspects:
Application on plastic packaging. Screen printing plastic film can be used for the packaging of food, clothing and other products, as well as the printing of plastic packaging containers.
Application on paper packaging. Due to the thick ink layer and strong stereoscopic effect of the screen printing pattern, the grade of the packaging can be greatly improved, and the application in the carton packaging such as tobacco, wine, cosmetics, nutritional products and high-grade footwear is increasing.
Application on metal packaging. Metal packaging mainly includes various beverage cans, food cans, miscellaneous cans, etc. The screen printing ink used requires strong adhesion, high hardness, good stretchability and abrasion resistance.
Application on glass packaging. Glass packaging is mainly used for various glass bottles, such as beverages, mineral water, and various beer, white wine, and wine.
Application on ceramic packaging. The direct method of ceramic screen printing is to directly print the image onto the ceramic embryo with a screen plate, and then glaze and burn it into porcelain. The indirect method is to transfer the screen printed flower paper to the ceramic utensils. Because the decals are printed finely, it is widely used in ceramic packaging, such as some advanced packaging of alcohol.
Second, the roller screen becomes the first choice for high-end packaging screen printing
With the development of packaging screen printing to high quality, high efficiency and diversification, roller screen printing has become the economical and high-tech packaging screen printing technology. Its printing products have thick ink layers, bright colors and heavy coverage. The force is good, the lines are fine, the patterns are seamlessly connected, and the printing ink with larger particles can be used to increase the stereoscopic effect of the graphic and the high definition of the printed image, and has been widely used in many high-grade carton packaging fields and label printing fields.
The roller screen printing system is composed of a plurality of independent monochrome printing units, which are suitable for various width printing, and can realize integrated intelligent control of the synchronous production line. The key technology in roller screen printing is the screen cylinder and printing system. The printing system uses a rubber scraper to squeeze the ink to penetrate the substrate through the mesh of the nickel mesh. The substrate is fixed by an impression cylinder, and the screen, the substrate and the impression cylinder move at the same speed. A "frictionless" system. The roller screen printing machine has stable and durable structure, and the screen can be used repeatedly. The overprinting is accurate and the speed is fast. It has a simple and convenient job change control system. The downtime of the replacement work is very short, and the equipment can achieve high output. The products with large printing quantity or repeated printing are the preferred models for packaging screen printing, and it is also a widely used model in the domestic packaging printing industry.
Third, the renewal of wire mesh materials has improved the quality and efficiency of packaging production.
The screen is the skeleton of the screen, which is the basis for supporting the photosensitive adhesive or the photosensitive film. It is the most expensive field for screen printing companies, including the price of the screen and the cost of screen installation and recycling. The new screen material is the primary guarantee for creating high quality printed products, saving costs and increasing efficiency.
Disposable wire mesh system. By using a disposable wire mesh system, labor intensity can be reduced, and screen printing can be quickly replaced. The screen can be pre-stretched with highly repeatable, stable equipment to ensure consistent screen tension for each screen.
Pre-coated wire mesh. The pre-coated screen of the photoresist can directly expose and develop the screen, which not only greatly reduces the step of coating and drying the screen before exposure, but also pre-coating screen coating can accurately control the thickness of the photoresist and accurately control the ink. Layer thickness for better print quality stability.
Non-woven mesh material. The new type of screen includes both perforated and corroded materials, and the non-woven screen overcomes the trouble of applying the photosensitive tape at the intersection of the conventional screen warp and weft. At present, the non-woven mesh material is made of 100% nickel by electroforming. The unique hexagonal structure can achieve excellent stability and ideal over-inking performance, which can make the screen wide and narrow. It can be stretched freely in printing, suitable for high-speed screen printing, and has the advantages of high calibration precision and high printing durability.
Fourth, the new screen printing ink provides new effects for high-end packaging boxes
With the introduction of various functional inks, especially the continuous development of UV ink production technology, the new screen printing process is favored in the field of packaging and decoration by virtue of its unique advantages. At present, the most widely used screen printing techniques such as imitation metal etching, ice texture, and refraction, the printed cigarettes, wine, gift packaging and packaging boxes, colorful, elegant and luxurious, can be called top grade, deeply loved by consumers, market sales I am optimistic.
Imitation metal etching screen printing process. On a metal-printed substrate such as gold or silver cardboard, the imitation metal etching ink is printed by screen printing to obtain a unique visual effect of a smooth metal treated by etching, engraving or sanding.
Ice silk screen printing process. The ice ink is printed on gold and silver cardboard. After UV curing, the surface of the printed product will show a crystal clear, dense and dense "ice flower" pattern, which will shine under the illumination of light, like the blossoming ice on the winter glass window. .
Refraction screen printing process. The refraction screen printing technology that has emerged in recent years is a new star in the packaging screen printing family. Screen printing can easily print ultra-fine bump lines on mirror gold and silver cardboard. After the light is irradiated, it will produce colorful refraction effects, making the box more noble and gorgeous.
Luminous printing. The ink used is a light-storing ink containing a luminous material, which is suitable for packaging printing of high-grade commodities such as high-grade cigarettes, wine, medicines and cosmetics.
Crystal glue printing. The use of crystal glue on the gold and silver cardboard to screen out the three-dimensional effect of crystal glue droplets, the new UV-curable crystal glue on the market is now fast film forming, wear resistance, brighter.
Crystalline gloss printing. The transparent ink layer on the surface of the printed product contains a crystal-like glittering substance, which can produce a colorful and sparkling special decorative effect when the angle of incidence of sunlight or light changes.
Mirror ink printing. It is a metallic screen printing ink. It is made of plastic resin mixed with special metal toner. It is printed on the back of transparent plastic sheet to obtain metallic mirror printing effect, just like hot stamping effect.
Fifth, the digitalization process of silk screen pre-press plate making is accelerating development
Modern printing technology has entered the digital age, and the continuous maturity of digital printing technology has brought about tremendous changes in the technology of screen printing. At present, computer printout plate making film, photo-export output film, inkjet output film, etc. are being widely promoted. With the increasing economic strength of the screen printing industry, it is believed that screen printing CTP will become the mainstream of screen printing plate making technology. The computer direct plate making system breaks the traditional screen printing mode, completely abandons the film bottom plate, uses the computer digital processing technology to design the required screen printing graphics and text symbols, and performs color separation and dot according to the requirements of the screen printing plate. After professional processing, it is stored in the computer, and then digitally converted and output, driving a dedicated inkjet device, spraying the image onto the screen of the coated emulsion, and directly obtaining and developing (rinsing) the silk. Screen printing plates used in web printing. Another method of direct imaging plate making is to directly scan the laser with a computer on a special metal alloy film. This method can save the screen and the photoresist without the complicated stretching process. It is the direction of future development without deformation, alignment, and high printing accuracy.
Sixth, combined printing makes the packaging screen printing process colorful
Because the packaging pays attention to the strong visual impact effect, especially some high-end packaging products are pursuing various unique artistic effects, in order to be unique in the market, therefore, combination printing has become one of the popular trends in the packaging field. It is well known that the main advantages of offset printing, gravure printing and flexo printing are the delicate graphics, rich reproduction of the layers, good reproducibility of the dots, and suitable for the printing of fine mesh images. The screen printing is characterized by thick ink layer, bright color, high saturation, strong three-dimensional impression, and can realize various anti-counterfeiting functions and special effects. The emergence of the combination of screen printing and other printing methods has determined that screen printing has a position that cannot be ignored in the field of packaging and printing. It has gradually become one of the main printing processes in the field of packaging and printing, greatly improving the quality and grade of products. Product sales also have a certain role in promoting. In actual production, more and more companies are beginning to use a variety of printing process combinations to achieve the desired special effects, such as offset printing and screen printing, flexo and screen printing. In particular, the rotary printing screen printing unit with extremely high printing precision is combined with the application of the flexographic printing machine to add embossing to the printing product. This method can obtain metal effects such as gold and silver and embossing and matting effects on the substrate.
Seven, the future improvement and development of screen printing in the field of packaging and printing
Printing speed is slower. Although the printing speed of screen printing equipment has been greatly improved, it is still relatively slow compared to other printing processes. If the production volume is too large, it may restrict production and affect the delivery time. The thick ink layer of the screen printing brings great difficulties to drying and takes a long time; the printed products cannot be stacked immediately, and many drying racks and large working places are required.
Accuracy and stability are subject to further improvement. From the perspective of production control and quality, the accuracy and quality stability of screen printing are inferior to offset printing and gravure printing. In particular, the accuracy of domestic screen printing machines still has certain problems, and it is easy to cause inconsistency in product quality in production. It is difficult to ensure the consistency of hue and specifications, not only between batch products, but also with the same batch of products.
higher cost. At present, the cost of screen printing is still relatively high. This mainly includes two factors. First, the ink layer on the screen printing is thick, and the ink is relatively large, which of course increases the cost. Second, the production efficiency of screen printing is relatively high. Say lower, the same process effect, screen printing will take more time, which will inevitably lead to an increase in production costs.
Multicolor overprinting is more difficult. At present, the screen printing equipment is basically monochrome printing. If multiple effects are to be realized on the same product or multi-color overprinting, there will often be a large amount of waste caused by inaccurate color registration, which not only wastes time and resources, but also affects The delivery date is even the next batch of orders.
The market needs a multi-color automatic screen printing machine. In order to improve production efficiency and overprinting precision, it is hoped that the automatic screen printing machine can develop in the direction of multi-colorization, and it will be promoted and popularized, so that domestic packaging and printing users can fully enjoy the advantages brought by multi-color automatic technology.
Ink should be developed in an environmentally friendly direction. In general, the screen printing inks produced in China are relatively complete, and some of them are very good. It should be said that the development is very fast. The problem is that the solvent-based ink solvent accounts for 60% of the solvent, and the solvent is volatilized in the air during drying, so the pollution is serious. With the increasing voice of environmental protection, the government has also introduced a series of related policies and formulated relevant standards. Customers' environmental protection requirements for packaging products will also become higher and higher. Therefore, in the future, research and development efforts on environmentally friendly inks will be intensified.
Screen printing materials need to be strengthened. China's screen printing industry is currently in a relatively backward state from equipment to materials, from plate making process to printing and postpress processing, and has not formed scale and modernization. In particular, high-quality, high-precision inks and special-purpose inks are used, and inks and UV inks for four-color screening are almost entirely imported. Therefore, the screen printing industry must actively absorb modern science and technology, so that screen printing technology will be more radiant and create greater economic value.
Digital printing will replace some of the screen printing market. The printing technology, such as inkjet printing and computer photo printing, will be used in the small printing market, which will replace some of the traditional application fields of screen printing. This has also shaken the determination of some silk-screen printing companies to carry out screen printing.
The digital printing of screen printing is the future development direction. The introduction of direct plate making technology by silk screen enterprises will face problems such as changing the entire work process, installing new equipment, personnel training, etc., and because the digital workflow of silk screen industry in China is still immature, the investment recovery cycle is long. These factors will become an important reason hindering the digitalization process of China's online printing plate.
As we all know, in the packaging and printing industry, screen printing plays a very important role in improving the packaging quality, enhancing the promotion effect and increasing the added value of the products. I believe that with the improvement of equipment and materials and the improvement of process technology, the screen printing will be carried out in the future. The packaging field is bound to achieve greater breakthroughs and development.