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The structure and technology of satellite flexo printing machine technological innovation of Zhejiang Guotai Electric Technology Co., Ltd. (Part 1)

satellite flexo printing machine, also known as central impression or central impression cylinder flexo printing machine, is the most important type of flexo printing machine. Data shows that in European and American countries, satellite flexo printing machines account for 70-80% of all flexo printing machines. In China, flexo printing technology is being more and more widely used, and satellite flexo printing machine will become a major model in the application field of flexo printing machine in our country. In addition, some printing machine manufacturers in China have begun to develop such equipment. Therefore. It is of great significance for the introduction of equipment or research and development to understand the current situation of its latest technology development

satellite flexo printing machine has many advantages: its control system is relatively simple and the investment is low; High overprint accuracy and high production efficiency; The production line is stable and reliable, and has a wide range of applications. Satellite flexo printing machine is mainly used in the fields of flexible packaging, carton, label and corrugated box pre printing. Generally speaking, the components of satellite flexographic press include: unwinding and input part, printing part, drying part (color drying and final drying), cooling part, output and winding part or wire processing part, main drive and control part, etc

the technical level of the satellite flexographic press can be accurately expressed by the following performance systems: the maximum number of printing colors and printing arrangement, printing materials and printing width, the range of repeated length of printing text, drying method, printing speed, suitable printing materials, ink type, but it is its control and automation system that centrally reflects the technical level of the flexographic press. Although flexographic presses use a variety of control and automation systems. But it can be roughly divided into semi-automatic type and full-automatic type

the following is a brief introduction to the new structure and advanced technology of the satellite flexo press:

sleeve type plate cylinder and corrugation roller

there are two types of plate cylinder and corrugated roller: integral type and sleeve type

the integral type has simple structure, good rigidity and wide adaptability, but the replacement is complex. The sleeve type is easy to replace, but its structure is complex. Each component is equipped with a pneumatic quick clamping and loosening device. Due to its low cost, easy loading and unloading, high flexibility, long service life, convenient storage, high system accuracy and rapid version change function, the sleeve type plate cylinder has been widely used in flexo printing and gravure printing, and will gradually replace the traditional printing plate

the sleeve type plate cylinder (or sleeve type corrugation roller) is composed of mandrel, air support roller (empty cylinder) and sleeve. When replacing the plate cylinder (or roller), as long as the air pressure switch on the printing unit is turned on, the compressed air is input to the inflatable roll and discharged evenly from the small hole of the inflatable roll to form an air cushion, so that the inner diameter of the sleeve expands and expands. The sleeve of the original plate cylinder (or roller) will pop up automatically. Replace the sleeve of the new plate cylinder (or roller), and the new sleeve can slide to the required position on the inflatable roll easily and conveniently. Turn off the air pressure switch, and the plate cylinder and the embossing roller will be fixed. When the compressed air is cut off, the sleeve will shrink immediately, and the semi-finished fiber matrix with the inflatable roll will be processed and fastened into one. The inner diameter of the sleeve is generally smaller than the outer diameter of the air support roll to ensure its engagement. Two or more sleeves can also be installed on the same inflatable roll. If the sleeve needs to be replaced or removed, just inflate the inflation roll again. The circumference and diameter of the sleeve of the plate cylinder (or corrugation roller) of the new satellite flexo press can be changed, while the size of the mandrel remains unchanged

the biggest advantage of the sleeve type plate cylinder is that it can be reused, and it can stick photosensitive resin plates on the sleeve at any time. In addition, the sleeve can also be used for laser engraving plate making, using seamless flexo, printing continuous patterns or patterns with the same background color. If the allowable printing perimeter change range of the sleeve system is 150mm, it means that the inner diameter of the sleeve with a printing perimeter of 350 ~ 500mm is the same, and only one inflatable roller is required. By changing the wall thickness of the sleeve, the purpose of changing the circumference of the sleeve can be achieved

gearless direct drive technology

the rotation of the plate cylinder and the embossing roller of the old flexo press is to drive the plate cylinder gear through the embossing cylinder gear, and the plate cylinder gear drives the embossing roller gear, forming a synchronous rotation. The repetition length of the printed matter depends on the gear of the plate cylinder and the plate cylinder, and the gear is limited by the pitch and modulus. Therefore, the repetition perimeter of the printed matter is the same as the pitch of the gear. The rotation of the embossing roller of the new flexographic press is directly driven by the plate cylinder, which solves the problem that the repetition length of the printed products of the flexographic press is limited by the gear pitch

each printing unit of the satellite gearless flexographic press is driven by seven motors, four of which drive the front and back movement of the plate cylinder and the embossing roller, one motor controls the longitudinal registration and rotation of the plate cylinder, one motor controls the horizontal registration and horizontal movement of the plate cylinder, and one motor drives the rotation of the embossing roller. After loading, input the circumference of the plate cylinder of the plate cylinder. Through PLC control, the plate cylinder and the embossing roller reach the pre printing and pre registration positions, which greatly shortens the different effects of different experimental machines, which not only reduces the printing pressure and printing registration time, but also saves raw materials

at the same time, due to the gearless transmission, there is no need to replace the gear when replacing printing products with different perimeter. It takes only 1 minute to replace the flexographic cylinder and the corrugation roller on a unit of the gearless satellite flexographic press, which greatly shortens the time spent on replacing the flexographic cylinder and the corrugation roller when replacing products Force measurement method: load sensor for force measurement; Time

the automatic registration system of the satellite flexographic printing machine launched by German eromac company adopts a registration probe to control the registration of all printing units of the flexographic printing machine, unlike the gravure printing machine, which requires 6 Registration probes and auxiliary motors for seven color printing. When printing products are not overprinted on time, the registration probe directly drives the motor through PLC to adjust the vertical and horizontal overprint position of the plate cylinder, unlike the vertical registration of intaglio, which is adjusted by the auxiliary motor. Using eromac automatic registration system to adjust the plate cylinder, the adjustment takes less time and consumes less printing materials. The system can automatically register according to the registration cross line, and can also register according to the manual setting, so as to solve the error between the printing pattern and the registration cross line during plate making and pasting

(to be continued)

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