Purple Laser CTP Features

Purple laser CTP is stable and reliable due to its exposure performance, small spot, the use of internal drum imaging structure, making CTP platesetter easy to operate, easy to achieve high-speed, and laser imaging system is cheap, compared with the thermal CTP generated low heat The phenomenon of plate expansion and contraction caused by temperature changes is rarely generated, and it can be operated under yellow light near the bright room, which improves the convenience of operation and is thus promoted as a promising CTP technology.

High resolution

Because the short-wavelength laser produces a smaller light spot, providing higher imaging resolution, the output image resolution can reach 250 lines/inch, achieving higher print quality.

Small and fast

Due to the small laser spot produced by the violet laser CTP, the reflective lens system of the laser head is reduced accordingly. The small laser head volume means that the speed can be increased. With a high-sensitivity silver salt plate, the laser head speed can reach 55,000 revolutions per minute. If converted to the inner circumference of the drum drum, the laser scanning speed is 5078km/h. At such a fast rate, even with a single beam, the violet laser CTP can be generally plated at a production speed of 22 full-length plates (1030 mm x 800 mm/2400 dpi) per hour.

Stable quality

The inner drum imaging model uses only a single laser and accounts for a relatively low total cost of the CTP; the outer drum imaging model, due to the limitation of the rotational speed of the plate cylinder, needs to use multiple laser beams to compensate for the speed defects, but its Relatively increased costs. Currently, the violet laser CTP on the market adopts internal drum imaging technology. This kind of imaging system has a stable light source and a strong laser spot, which can produce High Quality dots on the printing plate and improve the printing quality.

Easy maintenance and replacement

Violet laser diodes, due to their small size and high degree of modularity, are easier to maintain and replace, reducing maintenance time and increasing production efficiency.

long lasting

The lifespan of a violet laser diode is about 3,000 hours. Take a 1030mm x 770mm plate as an example. If you produce 100 plates per day and work 250 days in one year, the life of 3,000 hours is equivalent to about 3 years of use. It can be seen that the service life is excellent. In infrared diode lasers.

Purple laser CTP technology status

At present, purple laser technology is applied to CTP plate making machines by manufacturers such as Agfa, Heidelberg, and Fujifilm, and there are more than a dozen suppliers of violet laser CTP silver salt plates, such as Agfa and Mitsubishi Paper. As the silver salt plate is a mature and stable technology, it is currently the most widely used CTP photosensitive plate in the market. Its high resolution (up to 250 lines/inch) can precisely take advantage of the short wavelength of the violet laser, plus silver salts. The high-sensitivity characteristics of the plate (the critical value of the photosensitive energy is 2.5 μJ), 2.5 μJ of energy is equivalent to only 5% of the output power of the 5 mW laser head. Therefore, the earliest violet laser plates were based on the 410nm silver salt plate. However, on the one hand, due to the unstable performance of the silver salt platen and the silver content in the developer, the cost is high, and silver recycling equipment is also needed, which increases the investment cost; on the other hand, the laser power is continuously improved and improved. 5mW, 30mW development to 50mW, 60mW or even 100mW violet laser diode installed, 150mW purple laser diodes have to be launched, in this situation, for environmental considerations, 410nm violet laser photopolymer plate has been nothing wrong to become mainstream.

Purple Laser cTP vs. Other cTPs

Table 1 shows the advantages and disadvantages of silver salt and photopolymerization plates.

Comparison of the cost accounting of violet laser diodes and infrared diode lasers is shown in Table 2.

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