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What is CTP?
CTP including several meanings:
Offline-to-plate (Computer-to-plate)
Machine CTP (Computer-to-press)
Direct printing (Computer-to-paper/print)
Digital Proofing (Computer-to-proof)
The the ordinary PS plate-to-plate technology font, that CTcP (Computer-to-conventional plate)
The CTP system discussed here is the offline CTP (Computer-to-plate) printing technology. CTP is the computer directly to the plate, is a digital plate imaging process. CTP platesetter, imagesetter structural principle is similar. The platemaking equipment are directly with the computer control, laser scanning imaging, machine printed on the plate printing technology by developing and fixing generated directly. Computer to plate digital workflow, direct text, image into digital directly generate the plate, eliminating the need for a film of this material, artificial imposition process, semi-automatic or fully automatic proofing process.

2.CTP whom, when?
The the CTP concept of the proposed originated the idea of ​​an American in 1978, but due to technical and plates for various reasons, in the 1990s CTP really developed. DRUPA show in Germany in 1995, CTP is the first large-scale appearance, after they get rapid development.

Based 3.CTP technology running?
Digital workflow and CTP technology to run the necessary conditions and key. Most enterprises to adopt standardized workflow management prepress process, CTP output target, the progressive realization of digital photography, digital proofing, output portable document format (PDF), color management, digital process management, network transmission, and ultimately achieve full processes the digital printing market.

The technical characteristics of 4.CTP
CTP's main features are as follows:
(1) completely abolished film technology and materials, and greatly simplifies the process, significantly shortening the platemaking time;
2can output format of the printed version, and to meet the printing requirements;
3plate when the plate precise positioning to ensure the registration requirements of the plate;
The 4 Resolution, 3000 ~ 5000dpi output accuracy;
5 able to form a network of 175 to 300 lpi, 256 tone;
The 6 platemaking speed, a plate can be prepared in a matter of minutes;
7 four-color plates overprint precision, to the printing requirements, and to prevent moire phenomenon caused due to the dot shape, angle;
8 has good maneuverability, automatic transmission, automatic exposure, automatic developer to ensure the plate making accurate;
9 can produce good economic benefits.
5.CTP technology works
CTP platesetter by precise and complex optical systems, electrical systems, and mechanical systems constitute the majority. Original laser single beam generated by a laser, multi-path optical fiber, or a complex, high-speed rotating optical split-beam system is split into multiple beams (typically 200-500 beam) ultrafine a laser beam of each beam by the acousto-optical modulator, respectively press computer the image information in the bright and dark features, the bright-dark change of the laser beam to be modulated, into a controlled beam. Then focused, hundreds beam micro laser directly incident on the surface of the plate engraved version of the work CTP by scanning the engraved version, after the image of the latent image is formed on the plate. Has been developed after the image on the computer screen to restore direct printing plate for offset press. The light intensity distribution of each beam micro laser beam diameter and the beam shape and determine the clarity and resolution of a latent image to form an image on the printing plate. The smaller the micro beam spot of the light beam intensity distribution and more nearly rectangular (ideally), the higher the latent image clarity. The scanning accuracy depends on the mechanical and electronic control part of the system. The laser microbeam number determines the length of time of the scan. The more the number of micro-beam etching a printed version of the shorter time. At present, the diameter of the light beam has been developed to 4.6 microns, equivalent to printing accuracy of the etched 600lpi. The beam number up to 500. The time of the eclipse off plates in three minutes to complete the printing market. Other hand, EDITION beam output power and the energy density (per unit area on the laser energy generated in paper and packaging, in units of Joules / cm ²) is higher, the etching speed is the faster. Excessive power will produce shorten the working life of the laser to reduce the negative impact of the distribution of the beam quality.

What are the basic concepts of 6.CTP system?
The CTP system composed of many parts of the equipment, plates, software and technical support, including CTP machine version of the machine, the printed version, Fapai software RIP, systems management software, after-sales service, spare parts supply in many aspects.

7.CTP system of classification
Exposure system can be divided into: the outer edge of the inner drum, drum, flatbed, curve-four major categories of printing technology. Four types, use up the inner drum and outer drum; Flatbed mainly for newspapers and other large-format plates; curve with the least.
Plate varieties can be divided into: silver salt, thermal edition (the ablative thermal edition, non-ablative thermal Edition), photosensitive resin plate and polyester version (non-metallic version of the base), etc.;
From the technical aspects can be divided into: thermal technologies (the ordinary laser imaging), violet laser technology, the UV light source technology;
From the degree of automation can be divided into: manual stand-alone, semi-automatic and fully automatic type and mixed type (CTF-computer to film)
The connection from the plate fixed on the drum processing, can be divided into: adsorption and intermediate adsorption, inclusive clamp two cards. Full adsorption is no limit on the size of the plate, and the clip-plate format there must be a fixed size.
From the application can be divided into: commercial CTP system and reported with CTP system.

8 What is the raster image processors RIP? CTP system, what kind of role?
Raster Image Processor RIP, an abbreviation of the English Raster Image Processor, which is processed from the prepress layout to output film or plate process essential intermediate links. It is related to the quality and speed of output, operating environment, and even the entire system is the core of the entire system. The RIP's main function is to accept the data sent from the computer, and its translation into raster data information required by the output device for output printing market. At the same time the RIP also have other information on the role of the control of the output device and control output layout. RIP "translation" as a digital proofer, imagesetter, etc., the computer row of good graphic page output to different media essential hub link plays a vital role.

9.RIP by how many parts?
RIP, consists of a micro-computer and operating system software, RIP dongle, RIP and output device connected to the interface card and data cable, RIP software and fonts, etc..
General RIP can be divided into the RIP printing hardware RIP, software RIP, and the combination of hardware and software tools. The hardware RIP fact is a dedicated computer, dedicated page information to explain. Software RIP software page calculation resolves good information to CTP platesetter the software RIP should be installed on a computer. But as computer speed significantly improved, the the software RIP explanation algorithm processing network algorithm also continue to improve and software upgrades easier, more and more users of all ages.

CTP basics Raiders 2012-11-27 本文被阅读 4399 次
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