Revolutionary print pressure adjustment

The sign of modern lithographic printing press is "three high five", namely, high speed, smooth, high efficiency, multi-color, high quality and flexible, harmonious human-machine, digital network centralized, operation and management integration, automatic control intelligence, safety and environmental protection standardization. . We know that printing pressure is very important for lithography, which requires that the printing pressure adjustment mechanism of modern lithographic printing presses is fast, convenient, safe, and accurate.

1 How NipTronic Technology Works

Printer manufacturers have long dreamed of the ability to automatically set printing pressures with absolute precision. Now that Kna's water-free Cortina press uses NipTronic technology, operators can quickly and accurately adjust printing pressure by pressing a button on the console.

When using a specific type of blanket for a printing press, the printing of high-grade coated paper requires a printing pressure of 0.6 MPa between the two blanket cylinders. If the blanket and the thickness of the paper are not changed, printing is required. When the substrate is transformed into a relatively coarse newsprint, it requires three times as much printing pressure. When this happens in practice, few commercial or semi-commercial printer operators will replace the blanket or Liner, he is more likely to accept this as a minor quality damage that usually occurs when running different substrates. If a new blanket or thicker lining is to be installed in response to increased pressure requirements, this will of course change the pressure between the blanket and the plate, and at the same time it will automatically affect dot gain and plate wear. The same problem occurs when the thickness of the substrate in printing changes, for example, from 40 g/m2 to 85 g/m2 in semi-commercial printing production. Different rubber blankets with different surfaces (thereby making the ink transfer different), different properties, and different speeds of sinking (losing their elasticity) can complicate the problem. According to the type of blanket, when the thickness of the blanket is reduced by only 0.03 mm to 0.05 mm, the printing pressure is halved. Previously faced with this situation can only be honest to change the center distance between the two rollers to achieve the specified printing pressure, in order to ensure the printing quality, but this takes a long time to adjust the printing press, in today's society constantly seek for print quality and In the case of printing efficiency, the operator can quickly and accurately adjust the printing pressure by pressing a button on the console to become a reality - the birth of NipTronic technology.

With the new NipTronic technology, one of the weakest links in the entire lithography work sequence can be eliminated systematically, and print quality can be controlled with greater speed and precision.

NipTronic technology adjusts the optimal printing pressure between the plate cylinder and the blanket cylinder and between the two blanket cylinders via the console remote control.

NipTronic technology is a key innovation in the design and manufacture of printing presses, which will bring great benefits to users in terms of print quality and the range of substrates that can be processed. NipTronic technology is a sectional view of a bearing device. The bearing device includes a conventionally proven roller bearing that is mounted in a guide rail that does not move at all but can perform pre-stretch linear motion, so that the bearing can only be on one plane. movement. The precise embossing force is set according to a predetermined parameter value, and the plate blanket cylinder is electro-hydraulically compressed to lock the cylinder against the wedge after the pressure is applied. When the pressure is released, the system is released and the wear-free spring returns the roller to its initial position. This compact, integrated system operates in an oil-tight enclosure. The printing unit wall panels are oil-free.

The plate cylinder and the blanket cylinder may be separately pressured or pressured together. In the BB type printing press, the optimal printing pressure between the plate cylinder and the blanket cylinder and between the two blanket cylinders can also be remotely set individually or together. The four printing cylinders in the BB printer are arranged in a slightly inclined straight line. Screws are used to mount the bearing device on the wall plate against the cylinder body. When working with wide paper tape, this structure has more advantages: it minimizes vibration-related streaks and eliminates the need for shoulder irons and the resulting maintenance work.

2 Features of NipTronic Technology

NipTronic technology provides invaluable assistance in controlling the nip between the plate cylinder and the blanket cylinder in the most vulnerable areas of the lithography process.

The advantages of NipTronic technology are:

Since there are no multi-turn bearings or cams, the amount of turbulence is zero; the plate cylinder and the blanket cylinder are arranged in a straight line, and the bearing device is installed close to the cylinder body, eliminating the need for the shoulder iron, as shown in Figure 4. The position of pressure separation and pressure is directly integrated in the bearing device; when using a rubber blanket with different elasticity, or after using the blanket for a long time, the time can be quickly set or adjusted without replacing the time-consuming lining. Good printing pressure; when the type of the substrate is changed, if you change from newsprint to semi-commercial printing paper or vice versa, the printing pressure can be optimally set according to the previously determined reference value; reducing the load and extending the use of the bearing Lifetime The optimal pressure setting extends the life of the printing plates and blankets; reduces energy consumption and reduces maintenance; the reaction speeds up and reduces the risk of tape entanglement; the surface is sealed and pollution is reduced.

In the near future, the NipTronic technology will also be used on horizontal printing presses, provided that these horizontal printing presses have a dedicated drive for the cylinders, and the presses use oil-free wallboards. By then we will not use them completely. It takes time and effort to directly set the optimal printing pressure remote setting based on the type and thickness of the substrate to be used on the main console through the reference value of NipTronic technology. The value of the specific job can be corrected, saved, and downloaded later. Used for repeated jobs.