Purple Laser CTP Technical Analysis and Huaguang Purple Laser CTP Edition Introduction

First, the purple laser CTP version overview and imaging principle

Purple laser CTP technology has received unprecedented attention from printing and related industries due to its advantages of faster speed, higher precision, and longer laser lifetime. Throughout the world, an upsurge of research and development for purple laser CTP technology has been launched. In recent years, although there have been disputes between photosensitive and thermal technologies in the CTP field, the emergence of new photopolymerization and higher power diodes has enabled violet lasers to have thermal and UV in the newspaper CTP market. Technology tied position. Due to the superiority of the violet laser CTP technology, there has been a shift toward violet laser technology in the visible light CTP field. The production and promotion of the two new purple laser versions of Agfa and Fujifilm in the country have added impetus to this process, and even determined thermal advocates are considering entering the purple laser CTP field.

The violet laser CTP plate imaging process can be divided into four steps: exposure, pre-baking, water washing and developing:

Purple laser CTP plate imaging process

1. Exposure

During the exposure stage, the sensitizing dye in the coating absorbs laser energy, and the molecule transitions from the ground state to the excited state, and the initiator is sensitized by energy transfer or electron transfer, thereby decomposing and generating free radicals to initiate polymerization.

2. Pre-baking

The purpose of the pre-baking is to further cure the exposed cured coating (image area) under high temperature conditions, increase the dissolution contrast between the graphic area and the non-graphic area, and increase the intensity of the image area to increase the resistance to printing.

3. Washed

The purpose of water washing is to remove the water-soluble oxygen barrier layer on the surface of the photosensitive CTP plate before development. In order to ensure rapid removal, the thickness of the protective layer should be controlled within a certain range.

4. Development

Go to the uncured area and create an image. It is worth noting that the photopolymerization plate is often wiped with a brush during the development process, and the pressure of the brush on the plate surface should be strictly controlled.

Second, the market application

The users of the violet laser CTP are divided into two categories: commercial advertising users and newspaper users. The two types have different requirements for the quality of printed products, and finally decided to use the violet laser CTP plate-making system of different manufacturers. Fujifilm's LP-NV violet laser CTP was chosen by commercial advertisers because of its high precision. As of the third quarter of 2005, Fujifilm has sold 1,000 Luxel violet laser systems worldwide. Agfa's N91V has become a newspaper user's choice due to its high speed of plate making. As of the third quarter of 2005, Agfa has sold 1,200 purple laser plate making systems in the world, and the global newspaper CTP has used 95% of its products. Purple laser CTP (containing silver salt version).

The violet laser plate N91v is a violet laser version of the Agfa N91 photopolymerization version. The violet laser N91v version has the same printing characteristics as the N91 and can be flushed with the same chemical PDN91 in the same plate processor. With N91v, the increase in intermediate tone points can also be reduced from the previous 12% to 14% to 5% to 6%. It is reported that purple laser N91v has been produced in the United States or China according to market demand.

Fujifilm announced at the time of Ifra 2003 that the Brillia LP-NNV, a purple laser photopolymerized press for newspapers, can use the same plate processor and chemicals as the sensitized green laser plate Brillia LP-NN2. Thus, users of Fujifilm media are There is no need to change plate presses and chemicals when changing from green lasers to violet lasers. The LP-NNV has the same printing characteristics as the LP-NN2. It also requires warm-up and pre-cleaning. The company believes that the printing quality of LP-NNV is better and the shorter violet laser wavelength can improve the focus of newspaper platform CTP. The plate has a specific sensitivity of 50 μJ/cm2, and at 100 lines/inch, 2% to 98% of the dots can be reproduced, and the resistance force can reach 300,000 impressions.

Fujifilm also introduced another report with the CTP thermal version Brillia LH-NN, which can be processed in a standard photopolymer plate processor, without preheating, with a higher sensitivity than the Kodak PolyLight TNPP report plate. Sensitivity is 20% higher and productivity can be increased by 30%. Fujifilm also claims that LH-NN has greater latitude than Kodak Polyurethane's TNPP in terms of humidity and ambient temperature. This plate has a print resistance of 200,000 impressions and a one year shelf life. It can reproduce 1% to 99% of the dots and is suitable for 20μm FM screening. Because the coating is insensitive to UV light, the plate can be processed directly in the light chamber.

Kodak also officially launched Violet News and Violet Printing in the global market in 2006. The outstanding advantage of this media is its high sensitivity, which is about 35μj/cm2, but its stability is not good.

III. Huaguang PPV Purple Laser CTP Plate

Huaguang PPV type violet laser CTP is a high-end printing plate independently researched and developed by the second film factory of Lekai Group, and is a special edition plate of violet laser CTP plate making machine.

Huaguang PPV purple laser CTP features: high-resolution, high speed, strong development adaptability, long printing process, stable quality. It is especially suitable for high-end commercial color printing, and at the same time can fully meet the high-speed and high-efficiency requirements for newspaper printing.

Huaguang Violet Laser CTP plate uses a special high-quality aluminum plate as a support. After a series of chemical and electrochemical graining treatments, it undergoes hydrophilic surface modification to form a multi-layer composite sand head structure and a continuous, dense oxide film. The base surface of the plate ensures excellent imaging performance, abrasion resistance and ink balance performance of the plate.

Huaguang Purple Laser CTP version of the photosensitive layer formula design, so that the printing plate has excellent overall performance, at the same time to achieve high resolution as the core. Through the unique photosensitive compound structure and excellent photosensitive layer formula design, on the high-quality sand aluminum base, the plate can easily achieve ultra-fine network cable reduction, to meet the high-resolution requirements of high-speed commercial printing, while the plate also High sensitivity, high resistance to printing, yellow light operation, UV ink printing, and high resistance to various printing chemicals.

Huaguang Purple Laser CTP Plate adopts advanced multi-layer coating technology to achieve consistent production from plate base treatment, plate base hydrophilic treatment, photosensitive layer coating, protective layer coating and cutting, ensuring the plate High performance and stable quality.

Reprinted from: Lekai Second Glue Institute