Features and advantages of multi-function rotary press
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1, multi-function rotary printing machine
The multi-function rotary press is a rotary press that combines various printing methods and various post-press processing functions. With the market demand and the development of technology, the functions of the rotary machine have been expanded, and the single-function rotary machine has been unable to adapt to the increasingly complex market demand, and the multifunctional rotary printing press has emerged.
Various printing methods include: offset printing, flexo printing, gravure printing, gravure printing, silk screen printing, digital printing, etc. Post-press processing functions include bronzing, lamination, die cutting, embossing, folding, cutting and drying. The multi-function rotary press can simultaneously combine the above functions into one printing production line to form a multi-functional production capacity, so that the product can be completed at one time, which can improve production efficiency, and also reduce waste, and at the same time achieve the best printing effect.
In the past, people used a sheetfed press to complete the multi-function printing process. However, such a process also has its deadly weakness. For example, if the paper is printed many times, it will be deformed, resulting in inaccurate overprinting and increased scrap rate. In addition, if a printing press uses a sheet-fed printing press, after multiple printing and post-press processing, the company needs a huge space for semi-product stacking, and the production efficiency is undoubtedly very low. The application of the rotary machine effectively avoids these weaknesses.
The emergence of multi-functional rotary presses is a product of the ever-changing printing market and the ever-increasing demands on printed products. The characteristics of this type of printing machine are that it can fully reflect the current market demand for versatility and high efficiency. At the same time, the emergence of multi-function printing presses is also the product of various advanced technologies. Without the emergence of new technologies, multi-function printing presses are also difficult to enter the market.
2, printed features
Another outstanding feature of the multi-function rotary press is its ability to print a wide range of substrates. It has a wide range of substrates, including plain paper, cardboard, plastic film (PVC, OPP, etc.), aluminized film, stickers and composite materials. The thickness of the substrate can be between 20 and 350 microns.
Its specific products are: commercial rotary printing, plastic flexible packaging, aluminum film packaging, paper packaging, cardboard packaging, self-adhesive labels, silicone labels, seamless cylinder labels, and high value-added security printing, lottery printing, commercial Bill printing, art printing, etc.
Different printing methods have their advantages and disadvantages. The multi-function printing machine can effectively exert the strengths of various printing methods according to the characteristics of the printed products, and complement each other to achieve the best printing effect.
For example, offset printing is characterized by its advantages in printing precise halftones, uniform gradations and high definition. Flexo printing is good at printing on the ground, printing on metallic inks, and partial glazing. Gravure is good at printing metal inks, security printing, solid printing, and has a thick ink layer thickness. Line gravure is unique in online strip printing and security printing. Silk screens have special features in ink layer thickness, metallic inks and special printing effects. Digital printing is the specialty of printing changing content. Combined with hot stamping, laminating die cutting and other post-printing processes, not only can the printed matter reach the most satisfactory printing effect, but also greatly improve the production efficiency.
3, technical characteristics
The multifunction press has the following features in design:
Modular design
The modular design makes it possible to make any printing unit or post-press processing unit into a single module, which can be installed in the necessary position as needed, which makes it possible to arbitrarily increase the printing unit and the post-press processing unit. This increase can also be placed where the customer wants, as needed. The Vision press can be installed with up to 40 sets of printing and finishing modules to perform post-press processing such as offset, flexo, silk screen and bronzing. At the same time, the replacement of these plug-ins can be done quickly without any tools.
Shaftless technology
In the past, multi-unit presses used a main drive shaft. There will be no problems when there are not many printing units. However, when the printing unit is increased and the distance of the drive shaft is lengthened, the torsion instability and the hysteresis of the gear are generated, and it is difficult to keep the synchronous operation of each unit. If the drive shaft is longer, the more gears, the greater the error will be produced. As a result, the printing registration is difficult to guarantee and the printing quality cannot be controlled.
Using a shaftless technology, a motor is mounted on each printing unit and controlled by a computer to enable each printing unit to operate in a very precise manner. The connection between the units is not mechanical, but is driven by a central control computer. The precise control of the shaftless technology also greatly reduces the preparation time before printing and reduces the consumption. The use of shaftless technology makes it easy to add numerous printing units and post-press processing units while also ensuring accurate print quality. Due to the use of shaftless technology, the drive mechanism of the press cylinder is no longer limited by the gears, which makes it possible to install and replace rollers of different sizes. At the same time, due to the simplification of the mechanical structure, the company's spare parts reserve can also be reduced, and the benefits are improved.
Since the shaftless technology is more precise than the shaft design, the preparation time before printing is also greatly shortened, the efficiency is improved, the waste is reduced, and the advantages of the rotary machine are more obvious. This kind of rotary machine can even undertake printing business as short as 3,000 copies.
Plugin technology
A weakness of past reels is the limitation of the size of the printing web. Newspaper presses don't have this problem, and because the size of the newspaper is the same, it won't suffer from size. However, when you need to print different sizes of printed matter, because the diameter of the cylinder of the printing press cannot be changed, the rotary printing press is bound to waste paper. In order to solve this problem, the easiest way is to change the size of the roller, which is the problem that the plug-in technology has to solve. The plug-in technology is to make different diameters of the rollers into different inserts, and the roller inserts of different diameters can be replaced as needed, thus solving the problem that the rotary machine can print different size prints. Drent Goebel's presses are designed with a 3-roller kit. In each kit, the plate cylinder, blanket cylinder and impression cylinder are the same size. This design ensures roll printing. quality. Users can choose different sizes of rollers, the size of which can be increased or decreased by 4.23mm (1/6 inch) or 6.35mm (1/4 inch). Due to the change in the diameter of the drum, the maximum length of the print can be selected from 431.8 mm to 711.2 mm.
When replacing the plug-in, no tools or other artificial intervention is required other than pressing the button. The inserted roller set can be automatically locked in position and rotated to the starting position, and the four roller inserts can be replaced in 10 minutes. In addition, the plate can also be installed before the roller insert is replaced. As soon as the replacement of the roller insert is completed, printing can be started immediately, which greatly saves preparation time before printing.
Sleeve technology
Sleeve technology has been used in flexo printing in the past, and is now applied to offset rotary presses. This technique is also designed to enable the rotary press to print on different sized prints. The functionality achieved by the sleeve technology is consistent with the functionality of the plug-in technology, but the sleeve technology is less expensive than the plug-in technology. Because you don't need to replace the plate cylinder, blanket cylinder, and impression cylinder at the same time, the adjustment time required to change between different prints is shorter, just replace the sleeve.
Unlike the plug-in technology, the plate cylinder, blanket cylinder and impression cylinder using the sleeve technology are each equipped with a separate motor, which also makes the registration work more precise. The plug-in technology only has one motor to drive the plug-in.
Drying technology
Various drying techniques can be used on the multi-function rotary press. Such as UV drying, hot air drying, infrared drying, electron beam drying and high frequency drying. Depending on the needs, the dryer can be equipped with a chill roll or a separate drum cooling unit.
UV drying is the most suitable drying method that is often used, and is most suitable for printing and temperature sensitive materials. Sensitivity to temperature, ink flying ink, UV lamp position, etc. can be controlled in a variety of ways.
The advantages of using UV drying are: reducing energy consumption, reducing the amount of ink used, and reducing the temperature and pressure on the substrate. It is an environmentally friendly printing method with short preparation time before printing and fast drying of ink. Since 100% solid material is used, there is no solvent, and there is no pollution caused by solvent-free evaporation. The performance of the ink in the ink fountain is very stable, suitable for most printing materials, good glazing effect, solvent resistance and heat. It is resistant to abrasion and the ink color is durable.