Multi-process combination in label printing

July 12, 2020

Label printing ink

With the economic development, the wide application of labels in commodities has driven the rapid development of the label printing industry. However, at present, people do not know much about label printing inks than label materials and printing methods. Label printing inks, such as a mysterious field, urgently need to be recognized and explored.

There are many types of label printing inks. According to the different solvents used, they can be divided into three categories-water-based label printing inks, solvent-based label printing inks and UV label printing inks.

Multi-process combination in label printing

At present, domestic label printing mainly uses relief printing, offset printing, flexographic printing and screen printing. From a technical point of view, these printing methods have their own advantages and disadvantages. There is no inherent printing method that can replace other printing methods. A printing method.

Offset printing is a more extensive printing method. The single-sheet printing in China is basically the world of offset printing. This printing method is fast, high-definition printing, accurate overprinting, and full printing levels, but the durability is poor and the ink layer is relatively poor. Light, not suitable for printing bright color label products.

The graphic reproduction of letterpress printing is good, the printing speed is higher, the color strength and durability are stronger than offset printing, which is slightly worse than screen printing, but the level representation and registration are stronger than screen printing and flexo printing, so domestic Most of them use relief printing to produce labels.

The biggest advantage of screen printing is the thick ink layer and good hiding power, but the speed is slow, the level is poor, and the registration is low (this refers to the general level of domestic, Wan Ji has developed the registration of screen printing machines in recent years The accuracy has reached 10 silks, and the speed reaches 6000 prints per hour), so the screen printing machine can be used to print labels with a weak sense of hierarchy.

The printing characteristics of flexographic printing are relatively central. Most foreign countries use this method to print labels. However, this technology requires a high level of anilox roller processing and workers ’technical level. Although the machine is simple, the process is quite complicated. At present Not many labels are printed in this way in China.

To print the most exquisite labels, it is necessary to effectively combine various processes in the printing process, integrate the advantages of various printing methods, and form a greater combination of advantages. [next]

The purpose of multi-process combination

(1) Effective anti-counterfeiting effect: use multiple process effects to print on the same label product, especially in the labels of cosmetics and food packaging that are easy to fake, this printing method can allow consumers to pass the label at a glance Seeing the authenticity of the products, thus protecting the interests of product manufacturers and consumers, has also earned the printing plant an excellent reputation.

(2) Improve the quality of printed matter: the combination of multiple processes is to combine the advantages of various printing processes, so this combined printing method can ensure the printing effect of printed matter to the greatest extent, thereby meeting people's growing sensory requirements, and at the same time Improve the printing quality of the printing house, thus bring more living sources to it. Improve production efficiency and reduce costs. The combination of multiple processes also includes the combination of printing and post-press processes. Printing and post-printing are completed at one time during product production, and the finished product directly can greatly reduce costs.

The multi-process combination machine has the following two forms:

(1) One is a combination of single machines: in trademark printing machines, we are more commonly used as a cross-back type machine, which can complete the functions of printing, bronzing, die cutting, waste discharge, etc. on one machine, but because it is a single machine printing , Printing size will be affected.

(2) The other is that the unit is combined into a production line: it is a production line for printing and post-press processing such as embossing, screen printing, flexo and bronzing, die-cutting, etc. for printing production, and multiple processes are realized on the same product The combined effect. This combination of printing production methods meets the needs of the current label market development, the grade of printed materials has been greatly improved, and it has also brought huge profits to printing manufacturers. The development of unit-type production lines in China has become more and more Be optimistic.

Combination of letterpress, flexo and screen printing in label printing

Combining a practical example of label production to illustrate the combination of multiple processes in the production process. We want to print a label, the content of which includes color gradation, blue field, character head and corresponding text description. In the above comparison, we know that the pattern with richer color gradation is printed. In label printing, letterpress printing is more than flexographic printing. The sense of layering is stronger. The best choice for printing real maps and texts is screen printing, and we can choose flexo printing for the character's head. Therefore, on this label, we combined letterpress, flexo and screen printing together to form a production line to print beautiful labels. In label printing, the combination of relief, flexo and screen printing is a typical representative of a multi-process combination.

The process arrangement in the combination of multiple processes is also a knowledge. It requires a lot of practical experience, such as the slow drying of screen printing, etc., so a comprehensive and comprehensive consideration should be taken when combining. [next]

Common problems with label printing

When people talk about laser labels, they must think of the word "be careful" because it is difficult to produce and transport. Of course it is a great product, and the market is in great demand. But if you can replace it with other labels, then give up laser labels.

One problem is overheating. The heat of the fusion head on the laser printer reaches 250-300 degrees Fahrenheit. To produce a good label, it is necessary to combine the film base, adhesive and lining. Even if all kinds of raw materials are prepared, if the label moves too slowly in printing, it will be damaged by heat. The other is the problem of the corner of the label-this means that the label is invalid. After the product is damaged, go to the printing house for repair. Before the label is shipped to the user, the paper supplier and manufacturer must solve the above problems.

Laser labels are generally processed on rotary flexible printing equipment. Paper suppliers need to understand the moisture control requirements of laser labels so that they can solve the problems of curling and printer jams. Regardless of whether the curling occurs on 81/2 or 11 die cutting, it will be difficult for manufacturers to solve this problem.

Adhesive is another element. Heinl said, "If it is too soft, it will be on the accumulation cylinder, which is very expensive to repair. Unless a suitable blade is used when cutting the edge, the accumulation of dust on the cylinder will make the printing machine stuck."

In addition, care should be taken on the finished packaging to avoid label folding and damage to the printer's information data.

According to F, the sales coordinator of the Illinois CD company, the company uses special anti-roll lining and sealable plastic bags to package laser labels to prevent moisture (moisture and heat will curl the product). Since the adhesive dries out after one year, the shelf life of the label is written on the packaging. F said that when feeding laser labels to the machine, users can put them into the feed tray by hand to prevent curling, which can avoid failures.

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