At present, domestic label printing mainly adopts several methods of letterpress printing, offset printing, flexo printing, and screen printing. From the technical point of view, these printing methods have their own advantages and disadvantages, and each has its own inherent advantages and disadvantages. There is no alternative printing method. A printing method.
Offset printing is a relatively wide range of printing methods. The domestic sheetfed printing is basically the world of offset printing. This type of printing method has high speed, high printing definition, accurate overprinting, and full printing layers, but its durability is poor and the ink layer is relatively poor. Light, not suitable for printing brightly colored label products.
The letterpress printed copy has good definition, higher printing speed, stronger color strength and durability than offset printing, and is slightly inferior to screen printing, but the level of expression and registration are stronger than screen printing and flexo printing. Most of the use of letterpress printing methods for label production.
The biggest advantages of screen printing are the heavy ink layer and good hiding power, but its slow speed, poor leveling, and low degree of registration (this refers to the general level in China, and screen printing machine research and development in recent years. The precision has reached 10 silks and the speed is up to 6000 impressions per hour. Therefore, the screen printing machine can be used to print labels with weak sense of depth.
The characteristics of the flexographic prints are relatively central, and foreign labels are often printed in this way. However, this technique requires high requirements for the processing of the anilox roll and the technical level of the workers. Although the machine is relatively simple, the process is quite complicated. There are not many domestic labels printed in this way.
In order to print the most exquisite labels, it is necessary to combine various processes effectively in the printing process and integrate the advantages of various printing methods to form a greater advantage combination.
The purpose of multi-process integration is effective anti-counterfeiting: use a variety of process effects to print on the same label product, especially on some easy-to-fake cosmetics and food packaging labels that allow consumers to pass The label at a glance sees the authenticity of the product, thereby protecting the interests of the product manufacturers and consumers, and winning an excellent reputation for the printing plant.
Improve the quality of printed matter: The combination of multiple processes combines the advantages of various printing processes, so this combined printing method can ensure the printing effect of printed matter to the greatest extent, so as to meet people’s increasing senses and requirements, and at the same time improve the printing industry. The quality of the printing, so as to bring more live.
Improve production efficiency and reduce costs. Combination of multiple processes also includes a combination of printing and post-printing processes. Printing and post-printing are completed in the production process, and the finished products can be directly exported, which can greatly reduce costs.
There are two types of machines combined with multiple processes: one is a combination of stand-alone machines: In a trademark printing machine, we often use a ramp-back machine to print, bronze, die-cut, and discharge waste on a single machine. Function, but because it is a stand-alone printing, the print size will be affected.
The other is the combination of the unit into a production line: it is a printing production line that consists of printing and post-printing process units such as embossing, screen printing, flexo printing, bronzing, die-cutting, and post-printing processes, and combines various processes on the same product. effect. This modular printing production method adapts to the needs of the current development of the label market, the grade of printed matter has been greatly improved, and at the same time, it has brought huge profits to the printing manufacturers. The development of the unit-type production line in the country is increasingly Be optimistic.
The combination of letterpress, flexo and screen printing in label printing We talked about the characteristics of various printing processes above. In the following we will combine a practical example of label production to illustrate the combination of multiple processes in the production process. We need to print a label with a color gradation, a blue field, a portrait of a person, and a corresponding textual description. In the above comparison we know that printing patterns with rich color gradations are more prominent in label printing than flexographic printing. The sense of hierarchy is stronger, and the best choice for the printing of real map texts is screen printing. We can choose flexographic printing for the characters' portraits. So on this label we have combined the letterpress, flexo, and screen printing to form a production line that produces beautiful labels. In the label printing, the combination of such relief printing, flexographic printing, and screen printing is a typical representation of multi-process integration.
The process arrangement in multi-process integration is also a science and requires a lot of practical experience, such as the slowness of screen printing and drying. Therefore, comprehensive consideration must be taken when combining.
The more processes to be combined in a multi-process combination, the more associated processes are, the more associated processes are. Therefore, the following points must be noted: First, after each process is arranged, it is necessary to leave more space in the production schedule of each process. Quantity, when there is an emergency situation, it is convenient to arrange; Second, ink compatibility test should be conducted before printing to understand the performance of ink and other consumables in advance; Third, ink color matching personnel must go through formal color training, preferably equipped with advanced The color matching equipment such as spectrophotometer, etc.; fourth, according to the printing requirements set the speed of each printing press. In addition, the combination of multiple processes will also point to a new height of the accuracy of the alignment. Computer technology provides a favorable guarantee for the accuracy of the alignment. While improving the technology, printing companies should also pay attention to the improvement of computer technology.
The combination of multi-processes in the production machines produced by Wan Hao The combination of a simple stand-alone hatchback machine and a combined press of a full-rotation printing machine and a double-clamping machine At the same time, the manufacturer can also configure other high-speed screen printers and other equipment that can be combined with Wanhao to configure the unit production line suitable for production.
The combined process of multiple processes is a more complex process. The same job can have different process combinations or the same combination can print jobs of different qualities. This is in line with customer requirements, the level of printing equipment, the level of workers, etc. There is direct contact.
What we have discussed is only based on a certain perspective. I believe that all manufacturers will treat the “multi-process integration†issue as a beholder and a wise man. However, everyone's purpose is the same, which is to improve the quality of printed products. , to the greatest extent meet customer requirements.