Sheet-fed offset press connection device features (3)

(2) High printing cost: First, the price of UV equipment is high, and the depreciation cost is high; Second, UV ink is expensive, generally 4 to 5 times that of common ink; Third, the management and operation cost is high, and the content of UV offset printing technology is higher. High, must have a sound process plan and strict management, increase management costs. Due to the lack of workers skilled in UV printing technology, UV printing operators have high wages.

(3) The process is more complex and difficult: First, the point of UV ink ink balance tolerance is narrow, easy to cause more serious ink emulsification, dirty version, increased the difficulty of operation; Second, UV ink curing degree is not easy to grasp, dry is not complete , Dirty printed materials, high curing temperature, which may affect the paper deformation affect overprinting; Third, UV inks require high color sequence, improper arrangement of color saturation will be affected; Fourth, UV ink drying fast, stop printing Long time or machine speed is too slow, the ink may crust or even dry, affecting the printing quality.

Six, double-sided sheet-fed offset printing machine

With the development of double-sided offset printing presses, double-sided coating was mentioned on the agenda. The difficulty with double-sided coating is that the first side must be fully dried after the coating is finished. In addition to UV printing and drying can be carried out immediately (the cost of UV printing is high, some prints can not be UV printing) water-based coating is mainly dry time is not enough. Komori recently introduced two processing units behind the first group of coating units. The processing unit has no plate and blanket cylinders, only the impression and transfer cylinders, so that the paper has enough drying time before it is turned. .

Advantage

First, there is sufficient drying time to ensure that the coating is dry after drying; second, it facilitates drying to generate heat; third, it improves the drying ability. In order to adapt to changes in water and UV coating, IR and UV drying are added at the same time. The device is adapted to the requirements of different printing and glazing for drying, and the scope of use of the machine is increased. Fourthly, the printing quality and production efficiency are improved, and the reject rate is very low.

Disadvantage

Due to the addition of two processing units, the product price is higher and the area is increased.

Seventh, connection number, embossing, punching

After the printing unit, it can be completed by a marking number and embossing unit alone, or a simple marking and embossing device can be installed on the printing unit. It consists of an ink supply unit and a code box axis. The direction of the numbers on the box axis is different, and longitudinal or transverse numbers can be printed on the sheets. Remove the number box and press the convex block in place to emboss the print. Figure 5 is a perforation device configured on a sheet-fed offset printing press. In the longitudinal direction (printing direction), punching, cutting, indentation and embossing are required to install a corresponding tool (such as a punching knife) on a bracket which is installed at a position to be processed (horizontally adjustable.). Holes, cuts, indentations, and embossing are made in the transverse direction (perpendicular to the direction of the paper), and the relevant processing tools are mounted on the supporting shaft. Whether longitudinal or transverse drilling, cutting, indentation, and embossing are all The related tools and the impression cylinder are squeezed. Therefore, there should be protective measures on the surface of the impression cylinder.

Eight, line cutting, indentation

In recent years, die cutting and creasing devices have also been installed on sheetfed offset presses. The initial die-cutting and indentation is performed on the coating machine, ie, the die-cut version is mounted on a glazing roller. The position of the glazing roller on the die-cutting position is adjusted to die-cut or indent the die. Some also put the die-cut version on the blanket cylinder and squeeze it with the impression cylinder. It is now possible to have a separate die-cutting unit.

Individual die-cutting and indentation units can be equipped with a stripping device. A suction and blowing system is equipped on the die-cutting drum. The die-cut waste is firmly sucked on the die-cutting drum. When the die-cutting drum is turned to the exhaust exhaust position, the suction of the die-cutting drum is immediately changed to air blow, and the die-cut scrap is blown away. Was exhausted exhaust system sucked away.

Whether it is die-cutting, indentation, embossing or punching, the surface of the impression cylinder needs to be protected. Generally, a lining or a sheath is used.

Six, double-sided sheet-fed offset printing machine

With the development of double-sided offset printing presses, double-sided coating was mentioned on the agenda. The difficulty with double-sided coating is that the first side must be fully dried after the coating is finished. In addition to UV printing and drying can be carried out immediately (the cost of UV printing is high, some prints can not be UV printing) water-based coating is mainly dry time is not enough. Komori recently introduced two processing units behind the first group of coating units. The processing unit has no plate and blanket cylinders, only the impression and transfer cylinders, so that the paper has enough drying time before it is turned. .

Advantage

First, there is sufficient drying time to ensure that the coating is dry after drying; second, it facilitates drying to generate heat; third, it improves the drying ability. In order to adapt to changes in water and UV coating, IR and UV drying are added at the same time. The device is adapted to the requirements of different printing and glazing for drying, and the scope of use of the machine is increased. Fourthly, the printing quality and production efficiency are improved, and the reject rate is very low.

Disadvantage

Due to the addition of two processing units, the product price is higher and the area is increased.

Seventh, connection number, embossing, punching

After the printing unit, it can be completed by a marking number and embossing unit alone, or a simple marking and embossing device can be installed on the printing unit. It consists of an ink supply unit and a code box axis. The direction of the numbers on the box axis is different, and longitudinal or transverse numbers can be printed on the sheets. Remove the number box and press the convex block in place to emboss the print. Figure 5 is a perforation device configured on a sheet-fed offset printing press. In the longitudinal direction (printing direction), punching, cutting, indentation and embossing are required to install a corresponding tool (such as a punching knife) on a bracket which is installed at a position to be processed (horizontally adjustable.). Holes, cuts, indentations, and embossing are made in the transverse direction (perpendicular to the direction of the paper), and the relevant processing tools are mounted on the supporting shaft. Whether longitudinal or transverse drilling, cutting, indentation, and embossing are all The related tools and the impression cylinder are squeezed. Therefore, there should be protective measures on the surface of the impression cylinder.

Eight, line cutting, indentation

In recent years, die cutting and creasing devices have also been installed on sheetfed offset presses. The initial die-cutting and indentation is performed on the coating machine, ie, the die-cut version is mounted on a glazing roller. The position of the glazing roller on the die-cutting position is adjusted to die-cut or indent the die. Some also put the die-cut version on the blanket cylinder and squeeze it with the impression cylinder. It is now possible to have a separate die-cutting unit.

Individual die-cutting and indentation units can be equipped with a stripping device. A suction and blowing system is equipped on the die-cutting drum. The die-cut waste is firmly sucked on the die-cutting drum. When the die-cutting drum is turned to the exhaust exhaust position, the suction of the die-cutting drum is immediately changed to air blow, and the die-cut scrap is blown away. Was exhausted exhaust system sucked away.

Whether it is die-cutting, indentation, embossing or punching, the surface of the impression cylinder needs to be protected. Generally, a lining or a sheath is used. (Finish)