Computer To Plate Research Articles

PENGARUH KEKUATAN EKSPOS BASYSPRINT UV-SETTER 850 DAN SUHU DEVELOPER TERHADAP UKURAN DOT PADA PLAT CETAK OFSET MEREK MANROLAND

— Current development has led to the development of technology also, including the graphics industry, one of which is the offset printing platemaking process, which used to still use conventional methods in the process using film, the development growing currently into Computer to Plate (CtP) technology is used to be more efficient, better automation, and low cost run. This also affects the quality standard of the printed plate produced, one of quality on the printing plate is the dot/raster size that is produced according to digital data. CtP uses a linear standard within a tolerance 1% of dot recovery, but there are many factors that must be controlled in achieving this linear standard, some of these factors include the strength of exposure to CtP and the temperature of the developer. So in this study is to determine the combination of variables between the strength of CtP exposure with variables 5 ms/dot, 7 ms/dot, 10 ms/dot, 12 ms/dot and developer temperature with variables 18°C, 20°C, 22°C, 24°C which has the smallest overall average dot size shift in the highlights, midtones and shadows areas. The method used in this study is to measure the dot reference using a spectroplate on each variation of the variable combination of CtP exposure strength and developer temperature. Based on the research that has been done, it can be concluded that for the variable exposure power of 5 ms/dot with a temperature of 22°C is the variation that has the lowest average dot size shift with a shift of 1.8% for the highlights area, 1.5% for the midtones area, and 1.5% for the midtones area. 0.7% for the shadows area.

Pengaruh Dip Time Pada Unit Processor Terhadap Linearisasi Plate Cetak

This study aims to analyze the effect of the parameters on the processing unit on the quality of the printing plate. The parameters used in this study use the immersion time method. This research activity also aims to be able to know the real picture of the effect of changes in immersion time on the quality of the printed plate. Expected results of research on the effect of immersion time on the quality of printing plates, namely the extent to which immersion time affects the quality of Computer to Plate (CtP) plates to be printed on offset printing machines. Next, the researchers will also formulate problems that arise due to the development of plaques and provide solutions. This research should be a reference for users involved in improving print quality. For the printing industry can be used as a material consideration in the process of manufacturing quality printing plates for the good of the printing industry which is good at global competition.

Advances of Near Infrared Sensitized Radical and Cationic Photopolymerization: from Graphic Industry to Traditional Coatings

This contribution summarizes recent progress in the field of near-infrared (NIR) initiated photopolymerization. The photoinitiator system consists of a cyanine as sensitizer (Sens) and an iodonium salt with distinct structural pattern of both the cation and anion as radical initiator. Both, photonic and thermal events are discussed as the main source for formation of initiating species. Electron transfer between the excited state of Sens (Sens*) and the iodonium salt can be seen as the main source for formation of initiating species such as radicals and protons/electrophiles. Furthermore, the ion mobility as probed by the electric conductivity possesses a major function to tune the reactivity of the photopolymer system. The reactivity of these systems was studied in different applications such as Computer to Plate (CtP), LED curing, photonic baking, and curing of powder coatings with NIR lasers exhibiting line shape focus.

Digital Imaging of Lithographic Materials by Radical Photopolymerization and Photonic Baking with NIR Diode Lasers

AbstractPhoto‐initiated cross‐linking of multifunctional acrylic esters in polymeric binders was investigated based on digital imaging using the Computer‐to‐Plate (CtP) technology applying laser exposure in the near‐infrared (NIR). Generation of initiating radicals occurs by electron transfer from the excited state of the NIR‐sensitizer to the radical generator, an onium salt. Iodonium salts derived from several borates and those with the bis(trifluoromethylsulfonyl)imide anion resulted in lithographic materials with high sensitivity. Photo‐induced electron transfer plays a major function to generate initiating radicals by a sensitized mechanism but thermal events also influence sensitivity of the coating. Internal conversion was the major deactivation pathway while a certain fraction of NIR‐dye fluorescence was also available. A line shape focused laser system with emission in the NIR was successfully used to bake the materials.

CTP용 다 채널 LD - 드라이버 설계

A laser diode(LD) has been studied in many fields what medical, industrial processing, sensor, advertising equipment, printing equipment. And the LD is being used in industry. However, LD will require precision handling. Therefore, the actual use of LD is limited to areas of specialization. In this study, attend to the characteristics of the LD what weak to electrostatic and physical impact, current and heat. And will make a sample module that use comfortably a various wavelength LD. Furthermore, Furthermore, through the printing CTP(Computer to Plate) equipment used the 128-channel LD-Driver, compares it with a 64-channel CTP device about the print speed and resolution. And will solved the problem of delay between the dot and the dot. Finally, consider the potential of the 256-channel LD-Driver.

Imaging Characteristics Analysis of GLV-Based Thermal CTP System

The Grating Light Valve (GLV) is a spatial light modulator based on Micro Electro Mechanical Systems (MEMS), and it has been successfully applied in the computer-to-plate (CTP) system by modulating laser beams. Fast modulation rate, a mass of pixels, and high power handling capability of the GLV device increase imaging speed. Digital working states, combine of two GLV pixels and exact beam shape improve imaging quality. Numerical calculation and graph analysis using MATLAB software show that imaging quality of GLV-based thermal CTP system is higher than that of traditional acousto-optic modulator scanning system.

Application of NIR-Photopolymers in the Graphic Industry: From Physical Chemistry to Lithographic Applications

Abstract This contribution discusses photoinitiated crosslinking of multifunctional acrylic esters in polymeric binders based on digital imaging using the Computer to Plate (CtP) technology applying laser exposure at 830 nm in the near infrared (NIR). All coating components (NIR photoinitiator system, monomers, binder, adhesion promoter, contrast dye, and oxygen barrier material) were applied as thin double layer film (1–2 μm dry film thickness) on Al-plates with an anodized surface. Materials exposed exhibit a sensitivity between 30–200 mJ/cm2 depending on the NIR-photoinitiator composition. This was processed in a weak aqueous alkaline bath to obtain the image. Generation of initiating radicals occurs by electron transfer from the excited state of the NIR-sensitizer to the radical generator; that is either an onium salt or neutral electron deficient compound. Redox potentials were determined for the NIR-sensitizers and the radical generator. These data allow a rough estimate regarding the free energy of electron transfer of the excited state of the sensitizer and radical generator in NIR-photosensitive imaging material. Photoinduced electron transfer plays a major function to generate initiating radicals by a sensitized mechanism but thermal events also influence sensitivity of the coating. Particular the non-radiative deactivation of the NIR-sensitizer possesses a major function to release selectively the heat. Absorption data of many NIR-sensitizers used exhibit molar extinction coefficient of more than 200000 M –1 cm –1.

A thermo-sensitive imaging coating derived from polymer nanoparticles containing infrared absorbing dye

The present study relates to a method for incorporating a near infrared dye (the absorption maximum at approximately 830nm, IR-830) into polymer particles via miniemulsion polymerization and the preparation of an infrared laser-imageable coating based on the polymer particles as well as the potentiality in developing environment-friendly computer-to-plate (CTP) precursor. Polymer particles containing the IR-830 were prepared through miniemulsion polymerization technology in the presence of sodium dodecyl sulfate and hexadecanol as the emulsifier blend. Polyvinyl alcohol was used as a water soluble polymer binder resin for the production of latex coatings. Using the above prepared materials as the main components, an IR laser-imageable coating was prepared. Upon computer-controlled laser exposure, the IR dye-containing polymer particles absorb IR laser energy and produce high temperature, causing great changes of the imaged areas of the latex coating. As a result, the imaged areas could not be removed with water cleaning, whereas the polymer particles of the non-imaged areas remain unchanged, and still could be easily removed by water cleaning. When developing with water, negative graphics were obtained. The results of the research can be used in developing chemical-free CTP plates required by green printing industry.

光栅光阀光学特性分析及其在热敏CTP中的应用

The grating light valve(GLV)is a diffractive MOEMS spatial light modulator,and it has been successfully applied in the computer-to-plate(CTP)system by modulating laser beams.A simplified grating light valve optical model is put forward,and the optical characteristics of GLV is analyzed according to Fraunhofer single-slit diffraction theory and multiple beam interference theory.The application of grating light valve in thermal CTP system is described,and the structure and imaging principle of GLV optical write engine are analyzed.The digital imaging process of the GLV-based thermal CTP system is concluded,which provides the theory basis for the domestic printing enterprise to use the thermal imaging technology.

Analysis on Design and Mechanical Fabrication Process for Inkjet CTP Electromechanical Transmission Structure

The digital inkjet CTP (Computer to plate) device is one of printing equipments that urgently needs to be reseached and invented in China. Based on the current situation for computer inkjet plate-making devices widely used in the market, this thesis introduces work principle and system composition for inkjet CTP device, mainly from from the mechanical perspective to introduce structural composition of inkjet CTP device. By taking the example of some naked plate of inkjet CTP device, the sample of fabricated machine is studied for the composion of each mechanism in mechanical parts.

Preparation and Properties of Thermo-Sensitive Resin for Processless CTP Plate

Computer-to-Plate (CTP) technology has been becoming an important topic of research and application during the era of digital printing. Processless CTP plate is regarded as a leading candidate for CTP plate due to its many merits such as friendly to environment, saving resources, good quality of imaging, low cost and so on. A new thermo-sensitive resin which could be used in processless CTP plate was synthesized by solution polymerization with styrene and N, N-dimethylaminoethyl methacrylate in 1:1 molar ratio using azodiisobutyronitrile (AIBN) as initiator and 1,4-dioxane as solvent and then by hydrogen peroxide (H2O2) oxidation of the tertiary amine groups of the copolymer. It could be found from thermogravimetric analysis that there was a slight weight loss before 120°C owing to water evaporation; and there was an obvious weight loss from 140°C to 230°C owing to the decomposition of amine oxide group; and there was a large weight loss after 300°C owing to the decomposition of thermo-sensitive resin. It was found from contact angle analysis that the contact angle of the thermo-sensitive resin film reached maximum 75° after baking for 7 min at 140°C, which means that the decomposition rate of amine oxide group is slow and parts of amine oxide groups decompose incompletely. The contact angle of the thermo-sensitive resin film reached maximum 80° after baking for 5 min at 160°C or 2 min at 180°C which means that thermal decomposition rate increases with the increase of temperature and the decomposition occurs completely. It was also found that the resin film could be easily washed away from the substrate with neutral water before heat-treatment, but it could no longer be removed after the heat-treatment of baking for 5 min at 140°C or baking for 2 min at 160°C or baking for 1 min at 180°C. This new thermo-sensitive resin could be used in chemical-free thermal laser imaging application.

Determination of Technical Parameters in CTP Process and its Image Quality

The focal length, zoom, irradiating power and cylinder speed of laser head influence the exposure quality directly in computer-to-plate (CTP) process. This paper determined the most optimal parameters which used screen thermal sensitive device PT-R4100 by changing the focal length, zoom, irradiating power and cylinder speed of laser head. The most optimal parameters of focal length, zoom, irradiating power and cylinder speed in CTP process were 1500puls, 6700puls, 90%, 600r/min respectively。Compared with computer-to-film (CTF), we found that the image quality of CTP process was better. The average density, register accuracy and ink trapping of CTP process were higher than that of CTF. Ink formation was also better.

Determination of the Best Image Parameters in CTP Output Device

The exposure quality was influenced by focal length, zoom, irradiating power and cylinder speed of laser head in computer-to-plate (CTP) process. This paper determined the most optimal parameters which used screen thermal sensitive device PT-R4100 by changing the focal length, zoom, irradiating power and cylinder speed of laser head. Adjusted the setting parameters in order to divide the CTP plate into 13 test strips and each strip was divided into 13 small test pieces. This method could determine the most clear image teat strip by observing and measuring color and density of the test strips or test pieces, and then calculated the most optimal parameters. The results showed that this method could determine the parameters quickly and accurately. The most optimal parameters of focal length, zoom, irradiating power and cylinder speed in CTP process were 1500 puls, 6700 puls, 90%, 600r/min respectively。

Green Plate Making Technology Based on Nano-Materials

Laser phototypesetting and computer to plate (CTP) technologies are widely used in print industry. These technologies are based on the complex photosensitive image process. The exposing and development processes result in waste of photosensitive materials and environment pollution. Green plate making technology is not based on photosensitive materials but nano-materials. The image process of the technology is to jet the nano-composite transfer printing material on super hydrophilic print plate with special nano and micro-structure. Then the oleophilic image area and hydrophilic non image area are formed by adjusting interface characters between the nano-composite transfer printing material and super hydrophilic print plate. The plate is used for printing without exposing and development. Without photosensitive image process, the technology has many advantages such as no operation in darkroom, simple process, environmental friendly and low cost. The key problems of print resolution and press life have been solved effectively by preparation of nano composite transfer printing material and super hydrophilic print plate. In this paper, the research process of the nano composite material and the print plate are presented.

<p>Green Printing: Colorimetric and Densitometric Analysis of Solvent-based and Vegetable Oil-based Inks of Multicolor Offset Printing</p>

The purpose of this study was to determine the differences in the measurable print attributes (Print Contrast and Dot Gain) and color gamut of solvent-based (SB) inks vs. vegetable oil-based (VO) inks of multicolor offset printing. The literature review revealed a lack of published research on this subject. VO inks tend to perform (color reproduction) better than petroleum inks; in recent years many printers have come to prefer using VO inks. This research adopted an experimental research method. The experiment was conducted in a computer to plate (CTP) based workflow. During the printing, once the density values met the standard (GRACoL) ink density values, the press was run continuously without operator interference and 1,000 sheets were printed, from which 278 were randomly selected for colorimetric and densitometric analysis. The color gamuts of both inks were derived by using colorimetric data. The comparison of SB inks to VO inks led to the conclusion that the latter provides a greater color gamut. VO inks offer greater color perception in printed images. The densitometric findings make it difficult to draw conclusions about print contrast, as each of the inks had statistically significant higher levels of print contrast for two of the four ink colors. Further study is needed to control the variables.

SiOx Ink-Repellent Layer Deposited by Radio Frequency (RF) Plasmas in Continuous Wave and Pulse Mode

Low surface energy layers, proposed application for non-water printing in computer to plate (CTP) technology, are deposited in both continuous wave and pulse radio frequency (13.56 MHz) plasma with hexamethyldisiloxane (HMDSO) as precursor. It is found that the plasma mode dominates the polymer growth rate and the surface composition. Derived from the spectra of X-ray photoelectron spectroscopy (XPS) and combined with printable test it is concluded that concentration of Si in coatings plays an important role for the ink printability and the ink does not adhere on the surface with high silicon concentration.

Laser Direct Imaging – Towards a Universal Tool for Display Manufacturing

The constant push to reduce prices is forcing display manufacturers to continuously look for cheaper manufacturing methods. One of the main cost drivers in display manufacturing is patterning. The process of manufacturing a modern display includes several steps of patterning which are conventionally done by photolithography. Photolithography certainly delivers the level of quality that is required in modern displays but it requires costly equipment and, being a subtractive process, also considerable chemical infrastructure for handling the developing, stripping and etching steps which follow the patterning. Laser direct imaging, now the predominant patterning method in computer-to-plate (CTP) applications in graphic arts, has already been proposed as a replacement for photolithography in manufacturing LCD color filters and inkjet barrier ribs.The purpose of this paper is to present recent work done by Creo Inc. and our partners that demonstrates additional applications where laser direct imaging could replace photolithography in display manufacturing. Such applications include surface energy patterning, conductor sintering and process-less masks.

Synthesis and Imaging Performances of A New Type PAC.

In this paper, a new type photoactive compounds (PAC) of diazidonaphthoquinone(DNQ) have been synthesized based on the ballast of 2, 2-diphenyl-2-phenols group acetic lectone compound which is synthesized from benzilic acid.The new type PACs have good miscibility with common novolacs and dissolubility in the solvents used in positive photoresists and photosensitive compositions for PS plates. The photosensitive compositions composed of each new PAC and the novolac have well film-forming performance. Before exposure, the formed photosensitive film behaves strong dissolution inhibiting effect in alkaline developer. After exposure it becomes very easy to dissolve in developer. In other words it obtains good dissolution accelerating performance in exposed areas. Because the change of the effect of dissolution inhibition and dissolution acceleration is remarkable, B/P value can be designed higher, the photosensitivity is also higher and the quantity of exposure energy required for imaging is about 200mJ/cm2. In addition, it has good contrast and imaging film is easy to be taken off in concentrated alkaline liquor.The PACs are widely used in photoresists for integrated circuit(IC), especially in photoresists for liquid crystal display(LCD) and photosensitive compositions for positive PS plates including heat-sensitive computer-to-plate(CTP) plates.

Key Technologies for Next Generation Thin Film Silicon Solar Cells. Surface Technology of Pre-Sensitized Plate.

Printing has been one of the most important technologies in thousand years because of the reproduction of the Bible. Printing plates called pre-sensitized plate are not familiar compared with ink, paper and printing machines, but have an important role in printing technology. In offset printing, two different zones, ink-acceptant and water-acceptant areas, produce images. Water and ink are supplied to the plate in printing simultaneously and then transferred to paper. This is the essence of offset printing technololgy. Since the thickness of image area is about 1 micron (1/1000 mm), the offset printing is said to be a subtle surface technology. Usually surface-treated aluminum is used as non-image area and photo-sensitive polymers are used as image area. Advances of computer and laser technologies increase dynamically the demand of new plates called CTP (=Computer To Plate) in the printing market.

CTP Productivity and Recorder Design

The first drum recorders and scanners appeared in the 1920's. These devices, built on a lathe bed, imaged manually loaded films. The imaging sources were glow modulator tubes and incandescent lamps with mechanical modulators. During the intervening decades semiconductors, lasers, air bearings, brushless motors, and computers have been used to improve the image quality and productivity of various output devices. In the 1960's and 70's, visionaries foresaw the day when lithographic printing plates would be imaged by laser energy modulated by computer generated data. That day has arrived.Today, newspapers and commercial printers employ automated CTP (Computer To Plate) devices to image metal and plastic printing plates. Several system approaches have been developed, each exploits the characteristics of one of the several plate types that have been introduced. Systems are available that use, UV, visible or IR lasers.This paper reviews some of the CTP innovations that have evolved to meet the demands for image quality, productivity, reduced cost and environmentally benign operation.