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The working principle of CTP technology
Jul 04, 2017

The CTP Platesetter consists of three parts: an accurate and complex optical system, a circuit system, and a mechanical system. A single beam of raw laser generated by a laser, splitting into a plurality of beams (usually 200-500 beams) by a multi-path optical fiber or a complex high-speed rotating optical crack system. The beam of light is emitted by an acousto-optic modulator The brightness of the image information in the computer and other characteristics of the bright and dark changes in the laser beam to be modulated, into a controlled beam. And then by the focus, hundreds of micro-laser directly to the surface of the plate engraved version of the work, through the scanning engraved on the plate after the formation of the image of the latent image. After the development of the computer screen image information on the reduction in the printing plate for offset printing machine directly. The diameter of each micro-laser beam and the beam's light intensity distribution shape determine the resolution and resolution of the latent image formed on the plate. The smaller the spot of the microbeam, the closer the beam intensity distribution is to the rectangle (ideal), the higher the clarity of the latent image. The scanning accuracy depends on the mechanical and electronic control part of the system. While the number of laser micro-beam determines the length of the scan time. The more the number of micro-beams, the shorter the time to etch a plate. At present, the diameter of the beam has been developed to 4.6 microns, equivalent to etching 120lpi printing accuracy. The number of beams up to 500. The time for the etching of a plate can be completed in 3 minutes. On the other hand, the higher the output power and the energy density (the laser energy per unit area generated in units of Joules per square centimeter) of the beam, the faster the etch rate. However, excessive power will also have a negative effect of shortening the working life of the laser and reducing the distribution quality of the beam.


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Add:B-406 NO.11 XIYUAN BA RD. HANGZHOU,CHINA
Tel:+86-571-89003971
Fax:+86-571-89001669
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E-mail:
export@bridgehead.cn