CTP, CTcP, left or right?

It is an indisputable fact that computer platemaking will gradually replace film, but which technology is more suitable for Chinese commercial printing companies? The following technically makes a simple computer-to-plate technology on the current market. According to the plate or imaging technology used, it can be roughly divided into the CTcP technology exposed on the traditional PS plate and the thermal technology exposed on the thermal plate. And violet laser technology exposed on silver salt or photosensitive plates.

● CTcP

The core of the CTcP technology for imaging in the traditional PS version is the DMD chip and DSI technology. The DMD digital micromirror group produced by Texas Instruments in the United States is composed of more than 1.3 million extremely small lenses in an area of ​​less than 2.5 square centimeters. The side length of each small square lens is less than 17 microns. These small lenses are the unit of exposure, or "pixels."

DSI technology is the patented technology of basysPrint, this technology exposes the light on the PS plate through the DMD micro-mirror group. We know that the light source of the CTcP device is a mercury lamp with extremely high energy. Through optical reflection and focusing, the emitted ultraviolet light is collected on this small square of less than 2.5 square centimeters. Each digital micromirror can change the angle at a very fast speed. Through different angles, the light can be refracted away, or refracted to the focusing lens group to the plate, so that the 0/1 number of light is extremely delicately achieved Convert.

Driving this core is the magnetic suspension power system from the German company Siemens. The magnetic levitation linear motor avoids the influence of mechanical friction and vibration on the equipment, guarantees the smooth and smooth movement of the exposure head, and ensures its accuracy. The accuracy of the third-generation equipment has reached +/- 2 microns, and the accuracy of the fourth-generation equipment has been increased to +/- 0.3 microns, ensuring the accurate registration of the plate on the printing machine.

The biggest advantage this technology brings to printing companies is that it is exposed on the traditional PS version.

In terms of imaging quality, square exposure micromirrors produce square dots with sharp edges and rich image layers, while greatly reducing dot expansion. And because the PS version that the printing person is not familiar with is used, the familiarity with the plate material can make the operator complete the quality control easily.

In terms of plate-making efficiency, the publishing speed of the double-headed folio equipment reached 20 per hour. The single-head four-open device can also easily achieve 16 images per hour.

● CTP

The mainstream technologies of CTP are thermal CTP and violet laser CTP. Their common point is to expose on special CTP plates.

Thermal technology uses infrared laser emitters to generate infrared laser beams with a wavelength of about 805 nanometers. These beams stay on the thermal CTP plate for a period of time and ablate the surface coating, resulting in images and blanks.

The advantage of this technology is that its dots are relatively fine. With good CTP plates and good plate-making control, it can produce high-quality plates, but the speed is slower than that of the purple laser.

The special plate used in violet laser technology is the photosensitive CTP plate. This plate has a very high sensitivity and does not require high energy to make the coating chemically react. The laser beam emitted by the high-frequency ultraviolet laser emitter, similar to the thermal technology, scans on the surface of the plate to complete the exposure of the image.

The advantage of violet laser CTP technology is fast speed. However, the environment is very demanding, requiring dark rooms and dust-free treatment of the air. In addition, because the laser energy is Gaussian, there is a decrease from the center to the edge of the light, making the dot rough. Because of the high sensitivity of the plates, it is difficult to control the dots.

Both technologies have their own merits, but whether it is thermal technology or photosensitive technology, because special CTP plates must be used, and the plates are matched with the equipment, the two are tied together, and the plate production technology is mainly controlled abroad. In the hands of several equipment manufacturers, the price of the plate material has remained high for a long time, which is nearly double or higher than that of the traditional PS plate, making the printing industry that was already a small profit or a meager profit unbearable. A large part of it flows into the pockets of equipment suppliers.

● CTcP vs CTP (violet laser / thermal)

Below we make a simple comparison of these technologies in terms of quality, efficiency and cost:

CTcP technology has evolved from a theory to today ’s fourth-generation technology for more than a decade, and has entered

The Chinese market has also been in existence for four years. As a medium-sized but well-positioned basysPrint company, the development philosophy in China is very clear, that is, to bring customers the most cost-effective plate-making method with excellent German-quality technical equipment.

Because the traditional PS version is used, printing companies can really feel the joy of cost savings compared to the special expensive plates of CTP equipment. The PS version of more than 30 yuan per square meter is compared with the CTP version of 60-70 yuan per square meter, plus the potion that is no longer free. The CTcP method brings 50% savings and 100% profit.

In terms of quality, because the square dots are used, the edges of the dots are smooth and sharp, and the dot expansion is reduced. It is easy to output high screen lines at low image resolution. There is no problem for the conventional 175lpi and 200lpi processing. At the same time, with the correct front-end screen setting, it can also output 300lpi or higher network cables. The minimum dot size of 17 microns also lays the foundation for high-quality FM screening.

Because the dots of 10 microns can be achieved, the thermal CTP technology is better in platemaking quality, but except for a few thermal CTPs, most thermal imaging images are circular dots, which does not match the square pixels output by the computer. Yes, the purple laser technology has the same problem, which leads to errors in imaging. The Gaussian effect of the purple laser technology and the excessively high plate sensitivity make the quality of plate making unstable and difficult to control.

● CTcP, CTP left or right?

According to the latest statistics from the China Institute of Printing Technology, CTcP was firmly ranked third in sales of CTP equipment in 2007. After several years of investigation and argumentation, Chinese printing companies have a clear understanding of various types of computer-to-plate equipment, where to go, and the direction of the market has gradually become clear. 2008 is the CTP year of China's printing industry. CTcP is in it, and it will surely usher in unprecedented development with unique advantages!

Saitu Technology, as the general agent of CTcP products in China, has branches in Shanghai, Beijing, Shenzhen, Hong Kong, Chongqing, Hangzhou and other places, which will help the development of Chinese printing companies and provide them with the fastest and highest quality after-sales. Service and technical support! For more information, please contact 0755-27856766 or log in to the Saitu website.

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