Abstract: The main printed products of self-adhesive printing machines are product labels and signs, so they are also called self-adhesive trademark printing machines. In terms of printing methods, in addition to the commonly used screen printing method, there are three methods of self-adhesive printing: flexo printing, letterpress printing, and offset printing. Maintaining a self-adhesive printing machine is not difficult. When using it, you must pay attention to regular and quantitative lubricating oil. The operator must be familiar with the operating methods to avoid machine failure. Next, let’s take a look with the editor. What are the printing methods of self-adhesive printing machines

1. Flexographic printing

Flexographic printing is a typical printing method of self-adhesive printing machines. The main equipment is small and medium-sized unit printing. The unit, which mainly uses ink, uses roll-to-roll printing and circular die-cutting. It has the characteristics of high production efficiency, advanced technology and compliance with environmental protection requirements. The quality of its prints is no less than offset printing, and even has its own unique features.

2. Letterpress printing

Letterpress printing is more popular in Europe and the Asia-Pacific region. Professional self-adhesive printing machines that mainly use letterpress printing have the ability to print film labels. Self-adhesive labels printed with letterpress printing have the advantage of full ink color, but now the grade of letterpress printing equipment is quite different. Some are still using rotary flattening letterpress printing machines, some are using ordinary rotary letterpress printing machines, and some have adopted A professional slope-back, satellite or unit-type self-adhesive label printing machine has been selected, so it cannot be generalized during the transformation.

3. Offset printing

Offset printing is the main way of printing paper self-adhesives in label printing factories in my country. It is a type of lithographic printing, with clear graphics and text, and easy production of printing plates. It is fast and suitable for large-volume printing, and the printing equipment can be used for multiple purposes, which is suitable for the characteristics of the Chinese label market. Offset printing can print thicker plastic materials, such as in-mold labels and labels and tags, but the machine must be equipped with a UV curing device, which requires a considerable expense.

4. Screen printing

Screen printing is also what we often call screen printing. This is a printing method with the widest adaptability to substrates. Screen printing labels It is characterized by thick ink color and strong three-dimensional effect. Film products can be printed with UV ink. Except for a handful of rotary screen printing equipment that are capable of roll-to-roll label printing, most screen printing equipment are semi-automatic flat screen printers that can only print single products, have low overprint accuracy, and are not suitable for use with production lines. Film label production equipment.

Use and maintenance of self-adhesive printing machines

1. The operator must have a deep understanding of the performance and structural principles of self-adhesive printing equipment and be able to adjust them skillfully and correctly. , to ensure the machine operates reasonably. If there is a fault in the self-adhesive printing machine, it should be eliminated in time to avoid working with illness.

2. The environmental sanitation around the equipment in the self-adhesive printing workshop must be kept clean and tidy, creating a good working environment and allowing all employees to develop a good habit of civility and hygiene.

3. Add lubricating oil regularly and quantitatively. Since the offset printing equipment operates at a high speed of 5,000 sheets/h, adding oil has two functions: one is lubrication; the other is cooling. Make sure the oil line is smooth. It is also necessary to conduct regular inspections and observe the wear and tear of major components to avoid damage to parts due to sudden problems.

4. The offset printing workshop must formulate a set of equipment management implementation details, institutionalize and standardize equipment management, and strictly abide by safety technical operating procedures.

5. Strengthen daily minor repairs, select materials for replacement parts, and prepare spare parts for vulnerable parts, so as to shorten maintenance time, improve equipment utilization, and ensure the integrity of offset printing equipment.

6. A technical file must be established for each self-adhesive printing equipment to record in detail the wear and tear of various maintenance parts, analyze the reasons, draw corresponding conclusions, and accumulate experience. Provide technical information for equipment overhaul, and also provide reliable data for standardization of repair quality.

7. Improve the ability to read pictures, understand the operating instructions of self-adhesive printing equipment and the electrical schematic diagram of offset printing equipment, master the use and maintenance of the electrical drive and its control part of the host machine, and the principle of electric drag , Drawings are engineering language. Only after understanding the drawings can the self-adhesive printing equipment be repaired. Do not blindly disassemble electrical components.