With the development of economy, the wide application of labels on commodities has led to the rapid development of the label printing industry. However, at present, people know much less about label printing inks than about the label materials, printing methods, etc. Label printing inks need to be recognized and explored as a mysterious field.
There are many types of label printing inks, which can be divided into three categories based on the solvents used: water-based label printing inks, solvent-based label printing inks, and UV label printing inks.
Combination of multiple processes in label printing
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 combining multiple processes:
(1) Effective anti-counterfeiting effect: Use a variety of process effects to print on the same label product, especially on some easily fake cosmetics and food packaging labels. This allows consumers to pass a label. Seeing the authenticity of the product, thus protecting the interests of the product manufacturers and consumers, has also won an excellent reputation for the printing factory.
(2) Improve the quality of printed matter: The combination of multiple processes combines the advantages of various printing processes, so this combined printing mode can ensure the printing effect of printed materials to the greatest degree, thereby satisfying peopleâ€™s growing sensory requirements. Improve the printing quality of the printing factory so as to bring more living resources to it. 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.
Multi-process combined machines have the following two forms:
(1) One is a combination of stand-alone machines: In the trademark printing press, we usually use a ramp-back type machine to print, bronze, die-cut, and waste-discharge on a single machine, but because it is a stand-alone printing , print size will be affected.
(2) 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 processing units such as embossing, screen printing, flexo printing, bronzing, die-cutting, etc. to produce a variety of processes on the same product. Combined 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
Combine a practical example of label production to illustrate the multiple process combinations 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.
Common problems with label printing
When people talk about laser tags, they must think of the word â€œbe carefulâ€ because it is difficult to produce and transport. Of course it is a great product and the market has great demand for it. But if you can replace it with other tags, then give up laser tags.
One problem is overheating. The heat of fusion on the laser printer is 250-300 degrees Fahrenheit. To produce a good label, the film base, adhesive, and lining must all be combined. Even if all kinds of raw materials are well matched, if the label moves too slowly in the printing, it will be thermally damaged. The other is the problem of the tag corner - this means that the tag is invalid. After the product is damaged, it should be repaired at the printing factory. Before the label is shipped to the user, the paper supplier and the manufacturer must solve the above problem.
Laser tags are generally processed on rotary flexographic printing equipment. Paper suppliers need to understand the moisture control requirements for laser tags in order to solve the problem of curling and jamming on the press. Whether crimping occurs on 81/2 or 11 die cuts, it will be difficult for manufacturers to solve this problem.
Adhesives are another factor. Heinl said, "If it is too thin, it will be on the product drum, and it will be expensive to repair. Unless you use a suitable blade for trimming, dust will accumulate on the roller and cause the printer to get stuck."
In addition, care should be taken in the packaging of finished products to avoid label folding and damage to the printer's information data.
According to Illinois State Co. CD Sales Coordinator F, the company uses special anti-roll linings and sealable plastic bags to package the laser labels so that they are protected against moisture (tide and heat will curl the product). Since the adhesive is only dry after one year, the label's shelf life is written on the package. F said that when the user feeds the laser tag to the machine, he or she can put it into the feeding tray with his hands to avoid curling, which can avoid malfunctions.
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