The core problem that combined printing needs to solve is to play the advantages of various printing processes while effectively avoiding its shortcomings. This is also the direction of joint efforts of printing equipment suppliers and printing manufacturers for many years. Thank you very much for the development of contemporary science and technology, especially the development of servo control technology, to turn the goal of years of joint efforts into reality! The equipment supplier has solved the problem from the equipment and turned the idea into reality; the printer has fully exerted the performance of the equipment, and the beautiful products, beautiful packaging and colorful world are displayed in front of everyone.
Basic concepts of combined printing
For combination printing, everyone has their own different understanding, so what are the main combination methods currently popular in the industry? According to statistics, the combination methods currently in use include: the combination of flexo and screen printing; the combination of flexo and gravure printing; the combination of flexo and offset printing; the combination of flexo and relief printing; the combination of flexo and silk printing; Combination of printing, silk screen and gravure printing; combination of flexo printing, silk screen printing and relief printing; combination of flexo printing, offset printing and silk printing; combination of offset printing, silk printing, flexo printing and gravure printing; flexo printing and post-processing procedures such as cold transfer; Combination of hot stamping, laminating, indentation, embossing, slitting and die-cutting; combination of flexo printing, screen printing and post-processing procedures; combination of flexo printing, screen printing, gravure printing and post-processing procedures; screen printing, gravure printing , The combination of relief printing and post-processing processes; the combination of offset printing, flexo printing, silk screen, gravure printing and post-processing processes; plus the combination of the above-mentioned combination that began in 2008 and the digital printing or inkjet, etc. to implement variable information Printing combination, etc.
Different printing combinations have created brilliance at different stages, such as the McAndy 4150 in the 1990s, the Jetlas EM model at the beginning of this century, and the MO by Newport. However, with the development of science and technology, the intensification of competition and the improvement of life requirements, people have put forward higher requirements for modular printing. So what is the combination that currently represents the highest level of labeling and packaging? It must be a combination of today's most important and advanced printing methods and post-processing procedures, namely: offset printing, flexo printing, silk screen printing, gravure printing, digital printing, and post-processing procedures such as cold transfer, hot stamping, laminating, indentation , Pressure bump, slitting, die cutting, and inline quality inspection, etc.
Combining flexo printing with light pressure and gravure printing with heavy pressure, hot stamping, offset printing with long ink paths, etc., is a problem in itself, a manufacturer that can truly combine these high-end technologies and produce economic benefits, There are a few limited companies in the world, including: Italy's Gidue; Switzerland's Gallus; Denmark's Nilpeter. The main models are the Spade Xpannd of Kidd, RCS of Jetlas and MO of Newport.
The advantages and disadvantages of each main printing method
There is an old Chinese saying, "No chicken is not a feast"; in the printing combination, "no offset is not a real combination"! Offset printing is China's most extensive and popular printing method, so that it includes everything from advertising designers to all practitioners and end users. Everyone has the vision of 'offset printing' to see everything.
The printing method of offset printing is to transfer the PS plate to the blanket and then to the substrate. The printing cost of offset printing is low, the resources are quite abundant, and the technical personnel are sufficient. The printing overprint is accurate and can be controlled within ± 0.02mm; the dot reproduction is the best, the transition dot or the transition to the absolute mesh is very beautiful, and it will not exceed 10% -15% in the most deformable dot area; the printing quality is high, The usual printing resolution can reach 150 ~ 300lpi. However, offset printing is lacking when printing on the ground, and it is difficult to keep the ink color consistent. Sometimes, it is necessary to print twice on the large ground.
Flexo printing is a developing environmentally friendly printing, also known as green printing, which is a very common printing method in Europe and America. The range of printing materials suitable for flexo printing is very wide, which can achieve excellent solid, line printing and glazing. In large-area field printing, flexo printing is excellent in saturation and consistency, and the colors are bright and beautiful, and the printed matter can keep the ink color consistent. Flexographic printing usually has a printing resolution of 100 to 175 lpi. Water-based inks, alcohol-based inks and UV inks are commonly used in flexo printing. Flexo printing is a short ink path, and the ink transfer roller transfers the ink to the resin plate and then directly prints on the substrate. The printing is light pressure. The main problem of flexo printing is that the dot printing has a large deformation, and the cost of consumables such as ink and printing plates is higher than other printing methods.
Gravure printing is an extensive and common printing method other than offset printing. Gravure printing excellent field printing effect (ink layer thickness reaches 30μm) and metallic ink printing effect, the most commendable; gravure printing usually has a resolution of 100 ~ 359lpi; other advantages of gravure printing include high printing quality and high production efficiency , Good hue consistency, good material adaptability, high printing plate durability. Cooperate with other printing processes, gravure printing can print metallic luster, similar to hot stamping, cost-effective. Gravure printing is the most direct heavy pressure printing. The metal plate roller is directly inked and printed on the substrate. The main problem with gravure printing is that solvent-based inks are usually used, which is not environmentally friendly. Although water-based inks for gravure printing are also under development, they cannot yet completely replace solvent-based inks. In addition, the printing capacity of fine dots for gravure printing is lacking, and small dots are easy to lose.
Screen printing is a supplementary printing, mainly reflected in higher ink hiding power and color strength, the thickness of the ink layer is 20 ~ 100μm. Silk screen is more suitable for special surface treatment, uneven surface finishing, transparent film primer and Braille printing. The silk screen printing ink layer is thick, but the printing speed is slow, and the rotary screen is relatively expensive.
Relief printing is the most widely used method in Chinese label printing. It has the advantages of low cost and cheap plate making. However, the printing quality and printing speed of relief printing are limited. In addition, because the ink color transfer of embossing has a great correlation with speed, contact time, and temperature, it is easy to cause problems of poor ink color consistency and poor solid printing. In European and American countries, relief printing is a printing method that is being eliminated.
Advantages and trends of modular printing
Combined printing combines the advantages of various printing methods, can produce high-quality top-notch printing products, used for luxury luxury printing, can present the best product appearance. Combined printing can add value to printed products, make the product more valuable and competitive, and thus gain a greater market share; combined printing also provides an innovative platform, so that the process can be arbitrarily combined, and the design is more free. Because the product completes all printing and post-processing in one machine, no intermediate links are needed, and the product quality is easy to control, thereby shortening the product delivery time. With combined printing, the production and processing are more convenient, the cost is more economical, and the production efficiency is further improved. Due to the application of many high and new technologies in combination printing, the investment of equipment is relatively high, which also raises the barrier of entry and increases the difficulty of counterfeiting, so that the printed matter produced by the printing enterprise is unique.
Due to the increasing demands of end users for differences, combined printing presents a positive development trend now and in the future: combined printing methods adapt to the needs of the development of the modern printing industry, add value to printed products, and can give printing companies and end users Comes with huge profits; it represents the highest level of label printing and the prospects are promising!
With the extensive application of new processes, new technologies and new materials, combined printing is increasingly showing its strong advantages, and the development prospect is extremely broad. High-end modular printing equipment will set off a wave of innovation and progress in the country, so as to realize its two major commercial values: the first is to add value to its products, and the second is to be unique and reflect its uniqueness.
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