Photopolymerization CTP plate material introduction

Since its debut in the printing field, CTP technology has gone through a period of start-up to today's high-speed development stage. At the same time, the development path for CTP plates equipped with CTP technology has also grown wider and wider. A wide variety of CTP plates are classified into three major categories based on imaging principles: thermal, photo-sensitive, and ink-jet. Among them, the photosensitive media can be divided into four major categories of photopolymerization, optical-linked, silver-salt, and photosensitive phase-change based on imaging principles.

The development of CTP technology (including platemakers and plates) has been around for 30 years. After the plate material technology has undergone various scenes, the thermal-type and photo-polymerization plates have become the two major mainstreams of the development of CTP plates with their own advantages. CTP technology has matured.

The following is a detailed introduction to the photopolymerization CTP plate.

Three-layer structure; aluminum mesh base, photosensitive layer and protective layer after sanding. The photosensitive layer is mainly composed of a film-forming resin, a sensitizing dye, a photoinitiator, a monomer or oligomer, a stabilizer, and other additives. The protective layer is a polyethylene oxide barrier layer used to block the monomer or oligomer block polymerization. There are already reports in the literature that photopolymerization plates that do not pray for protection have been successfully developed.

After the plate is scanned by the laser light source, the sensitizing dye in the photosensitive layer of the visible part first absorbs the photon energy into the excited state and then transfers the energy to the photoinitiator. The photoinitiator decomposes to form free radicals, and the free radical initiates monomer or The polymer is polymerized and solidified, and the portion not showing light in the graphic portion is removed by development to form a blank portion.

· violet laser diode (410nm)

Nitrogen ion laser (488nm)
· Current D YAG laser (532nm)
· Let the infrared laser diode (830nm)

1. The printing type of photopolymerized CTP plate belongs to the traditional offset printing type. Due to the thin thickness of the photosensitive layer, the graphic part and the blank part of the tomb are on the same plane. The blank part is a grinded aluminum plate, which has good hydrophilicity and repels oil: The graphic part is a solidified photosensitive layer that has pro-dominance and repels water. The graphic part adsorbs the oil and transfers the oil star to the blanket cylinder and transfers it to the substrate to complete the printing.

2, photopolymerization CTP plate is negative type. From the previous imaging principle it is known that after light irradiation, the visible part of the plate is polymerized and solidified to form a graphic part. No light part is removed by development to form a blank part.

3. The development of the photopolymerizable CTP plate is alkali development. The film-forming resin and monomer or oligomer in the photosensitive layer have a certain degree of acidity and can be dissolved in an alkali solution and removed by development. After the photocuring, it cannot be dissolved in the developer.

1) The first type of celebrity c:}rP material with a sense of service than Shangtian sense, four this version of the brush against the partners, especially with the newspaper industry.
2) The plate-loading laser (violet laser diode) has low cost and long life.
3) The photopolymerization CTP plate is of a negative pattern type, and therefore has the feature that the negative plate material has a high printing durability.
4) Powerful For different plate-making machines, we can find matching photo-polymerized CTP plates for commercial and newspaper printing.

5, alkali development pollution is conducive to environmental protection.

Shanghai Printing Technology Research Institute is the first company to get involved in the development of photopolymerization CTP plates. The photopolymer plates developed and developed for 488nm laser sources and 532nm laser sources have passed the technical appraisal of the Shanghai Science and Technology Commission. Newly-developed photopolymerization plates adapted to 410---532nm laser sources have been tested on different platesetters. Good results are currently being organized for trial production.

Lokkai Group's second film factory began to develop Huaguang brand photopolymerization CTP series plate materials in 1998. It has overcome many difficulties brought by equipment and raw materials from scratch. After 6 years of unremitting efforts, it has made remarkable achievements. The second film factory of Lekai Group attaches great importance to the development of plate materials, and has increased its efforts in terms of manpower and material resources, as well as the industrialization process. Recently, it has also newly purchased the COBLAT4 violet laser platemaking machine for scientific research and development. The research and development of PPA (488 nm), PPY (532 nm), PPV (410 nm), and PPI (830 nm) technologies are all basically mature and industrialization is underway.

Nowadays, the development of CTP plate lags behind the plate-making machine. Especially in the country, the issue of plate material price limits the installation speed of the plate-making machine. It is believed that the successful development of the domestic photopolymerization CTP series plate will help the development of CTP technology in China to increase the choice of the CTP plate material users.

Different types of photopolymerized CTP plates are suitable for different wavelengths of light sources, and there are matching plates from blue to infrared light, but along with the development of laser technology and related technologies, photopolymerization CTP plates can be developed in the future. The direction of development.

In 2003, NICHIA launched the 30mW violet laser diode laser and the ever-higher power violet laser diode was born, enabling the plate-making machine loaded with this laser to meet the photosensitivity requirements of photopolymerized CTP plates. This laser has a short wavelength of high energy, a laser with fine dots, which makes plate making faster and with higher precision, and it has the advantages of low cost, good stability, long life, bright room operation, etc., making the purple laser plate making machine develop continuously. Laser photopolymerization CTP plate is a development direction.

Plates based on thermal technology will continue to develop and improve with their obvious advantages such as no dot expansion and high resolution. Thermal plate-making machines will become more and more common in the printing industry. Photopolymerization CTP plates adapted to this plate-making machine (used in the industry to refer to this plate as a thermal polymerization version of the newspaper are based on the principle of photopolymerization) Opportunity for development. This type of plate has the advantage of faster plate making speed compared with the thermal plate and will occupy a place in the newspaper industry. Therefore, this type of photopolymerization CTP plate is also a development direction.