Digital Printing Machine Research Articles

The Study of Wide-Format Digital Inkjet Printers’ Carriage Control Method with Double-Carriage

Aiming to shorten the inkjet printing mechanism single printing time based on the existing digital printing machine,the plan of wide-format digital inkjet printer with double-carriage was proposed to improve the printing speed.Referencing these ordinary printing machine products, the double-carriage reasonable motion parameters were given and the equations of the motion were established.After simulating the real printing process,the phenomenon of collision and printing deficiency was avoided by the way“carriage will give the way".PID control algorithm was adopted to control the carriages’ displacement and solve the coupling problem of mechanical systems.The ADAMS/Simulink combined simulation control systems ensures the displacement fluctuations within the permissible range.

Discussion on Application of 3D Printing Technology in Package Printing

The principle of 3D printing technology is based on the basic principle of ink-jet printing. The application of 3D printing in packaging printing is discussed, including printing history, development present situation, the principle, equipment, the advantages and disadvantages of 3D printing. The application of 3D printing in digital printing machine manufacturing and in offset printing plate making and screen plate making is studied. This paper is of great significance for the transformation of the printing industry.

A Novel and Efficient Method for Digital Printing

We propose a method for digital printing which is novel and efficient. Digital printing is a technical breakthrough in the field of traditional printing and dyeing industry, which is also an effective solution to solve the three high problem, namely, high energy consumption, high noise, high pollution, in the traditional printing and dyeing industry. However, the widely used methods in printing and dyeing system have some deficiencies, such as the low performance of the PC processor and the limitation of transferring data by parallel interface. The proposed method takes advantage of multi-core processor, DMA and RAID technology. Multi-core processor can speed up the processing of the print command and the print images, while DMA technology can minimize the intervention of the CPU to input/output operations which makes the CPU more effective to process the images. Furthermore, the use of RAID technology can improve the access speed of the hard disk which leading to the efficiency improvement of the entire computer system. As we can see that the combination of those three technologies can greatly improve the efficiency of digital printing machine, thus speeding up the popularity of digital printing.

Requirement of Map Digital Printing on Digital Printing Machine

Currently, a mass of digital printing machines emerge in the market, whose brands, norms and types are abundant. Their application in the field of digital printing is increasingly wide. However, after the study on these machines' parameters, the fact that almost no machine can be used in map digital printing is discovered. Therefore, digital printing technique can hardly be used in map digital printing field. This paper analyzes the particularity of map products, pointing out the fact that maps have relatively large breadth and lay rigid requirement on the image-text precision, which should uses high folding strength while low variant paper to print. Current printing machines cannot meet the needs of the above parameters simultaneously, which leads to the blankness in map digital printing field. This paper put forward the needed parameters and chief functions of digital printing machines used in map digital printing, which provides important reference for the printing machine producers and manufacturers to extend the products' application range.

Tone Reproduction Characteristic of Digital Printing

Digital printing has the advantages of variable data, printing according to the demand, individuation service. Therefore, its appropriation in the market of printing field is increasing year by year, and its quality draws near to the offset printing. This paper carries out experiment and does research into the tone reproduction characteristic on the color representation ability of Indigo3500 based on electric ink printing and Canon 7000VP digital printing machine based on carbon powder printing. By obtaining the dot characteristic curve and color gamut range and comparing its offset printing effect with Heidelberg CD102, this paper gets the conclusion: Each tone's dot gain curve of digital printing has the same variation tendency, the tone rendition of digital printing can simulate the offset printing effect. Color gamut has apparent discrepancies the color gamut of Indigo3500 is relatively broader, which can contain the offset printing color gamut. The color gamut range of Canon 7000VP is close to offset printing, but its color gamut range is apparently different. From the aspect of printing quality, the product of digital printing can meet the needs of common offset product. But from the aspect of microcosmic quality, the dot structure of carbon powder printing is not ideal, whose visual sensation is relatively inferior. The dot of electric ink is identical to the offset printing, whose visual sensation is close to the offset printing.

On-demand Transcript Foil Print Technology for Smart-Phone Decoration

Recently, the spread of a smart phone is especially remarkable though the portable terminal is widespread. On the other hand, the diversity of the commodity is requested, and there are a lot of demands of the color variation of the product as for the market, too. Moreover, the demand of the decoration of a metallic color has increased in the market.There are three needs in the decoration of a smart phone. The first is a part around the screen on the surface of the touch panel and a decoration of the logo. The second is a decoration of the back cover of the battery cover. The third is a decoration of a hard case to cover the whole to the purpose as for protection from the dropping impact of a smart phone. For this demand, we have developed totally dry, environment-friendly and small-footprint digital printing machine which is characterized by its Foil printing. It achieved it in the decoration of the surface of the touch panel of the first demand by decorating Anti scattering film. Moreover, because the 2nd and 3rd demand was threedimensional the shape, the decoration with 3D transcript was achieved by 3D heat transcript method with an expanding film. Moreover, it was necessary to avoid the electromagnetic interference in the metallic color decoration with portable telecommunications equipment. We made the ribbon of metallic ink of non-conductive for this problem, and achieved the method of the decoration with the on-demand. As a result, we achieved the ondemand decoration of a smart phone, and came to be able to meet diversified needs.

Workflow Optimization of Raster Image Processor for Digital Press

Raster image processor is decisive in modern digital printing machines. Three random number generators were examined for their applicabilities to raster image processor. Results show that random number generator should be carefully selected in terms of the screen cell size adopted: linear congruential generator (LCG) is the best for the screen cell size of 8 × 8 or 16 × 16; multiplicative congruential generator (MCG) is most desirable when the screen cell size equals to 6 × 6 or 12 × 12; in the case of 24 × 24 screen cell size, either LCG or MCG is optimum. The workflow of raster image processor was optimized according to our results. These findings are helpful to improve the performance of digital press that is equipped with raster image processor.

Технологічні аспекти виготовлення персоналізованої подарункової продукції типу фотоальбом

Tendencies of development of the Ukrainian market of picture albums are analysed; classification, algorithm of quality assurance of the press of picture albums on the digital printing machine are developed. The basic indicators of quality assurance of half-finished products according to which research of quality of the press of picture albums was carried out are considered.

Study on Color Simulating between Offset Printing and Digital Printing

Color output capability and output accuracy of digital printing machine used for simulating the offset printing were analyzed. A digital machine, HpIndigo 1050, was used in this study. The colorimetric values of its primaries, cyan, magenta, yellow and black, were not the same as that primaries used in the offset printing, and the differences between them could not be removed by adjusting the maximal output ink level. The HpIndigo’s color gamut, consequently, could not completely meet the offset print requirement, typically presenting the absence of some colors equal to or close to the offset’s color gamut. So, color management technique was accepted in our experiment, and the offset’s CMYK values were translated into the digital machine’s CMYK values with the relative intent color simulation through these two machine’s profiles. The results showed that the color output accuracy within the offset color gamut was raised on the whole, and the big color differences only happened on these colors outside the digital machine’s gamut. Numerically, for 928 colors in IT8.7/3 chart, the CIELAB average/maximal color differences dropped from 4.98/13.90 to 3.13/13.13 respectively corresponding to the cases before and after color management accepting. Specially, for gray colors, the average/maximal color differences changed from 4.91/5.59 to 0.92/2.00, improving the gray balance dramatically.

Effect of NaCl and Moisture Content on Electrical and Dielectric Properties of Paper

t. The electrical and dielectric properties of paper are important parameters in electrophotography influencing both toner transfer and runnability in laser printers and in digital printing machines. These parameters are dependent on the ionic content and moisture content of the substrate. The effects of NaCI content of the substrate and the ambient relative humidity (RH) on the direct current resistivity in different electric fields and on the real part of the dielectric constant and dielectric loss factor at different frequencies have been investigated with experimental papers of different grammages. A physical model of electrical conductivity in papers with ionic addition is proposed, based on the hypothesis that ionic addition not only increases the number of available free ions but also changes the water state and the paper structure, which influence the ionic motion in an electric field. This model is supported by the dependencies of the real part of the dielectric constant and the dielectric loss factor on the NaCI content, RH, and frequency.

The Printing Quality Control of HP Indigo Digital Printing Machine

In order to ensure printing quality of HP Indigo digital press 1050, the prints was printed on three kinds of paper through different compensation curves and changing developing drum voltage and laser energy value. With testing the solid ink density and dot area percentage of prints, the effects of these factors on digital printing quality were studied and two methods that adjusting dot area percentage were compared. The results indicate that different compensation curves have different effects on dot gain, the increase of developing drum voltage can improve solid density, and the increase of laser energy value can enlarge dot area percentage and the method using color control to adjust dot area percentage is more accurate than color match.

Inkjet printed indicators

Inkjet is an exceptionally versatile printing technology, which application areas vary from inexpensive desktop printers for home printing to photo-quality wide format printers for graphic arts applications and ultra-high-speed digital printing machines for transactional and book printing. Because inkjet is a digital method – where liquid drops are generated from a print head driven by computer controlled electronic signals – very small amounts of material can be added and aligned precisely. Inkjet is also the only non-contact printing method, because there is no interaction between the print head and printing substrate during printing. This means that topography of printing substrate or shape of a printed object isn't as critical as it is in other printing methods, which often require relatively planar, smooth and durable printing surfaces. These two features make the inkjet technology especially appealing also for manufacturing applications. VTT has worked with inkjet technology more than a decade in the areas of publication and packaging production. In the end of last decade, we got interested in developing manufacturing methods based on inkjet. One of our goals has been the development of inkjet printed quality indicators.Optical indicators are based on active compounds, which undergo a definite colour chance depending on changes in exposure conditions. Indicators are used to monitor, for example, food product quality in real time and also remaining shelf-life can this way be better estimated. VTT has developed and patented special ultra-low-cost ink jet printable indicator systems for example in checking the freshness of food supplies. VTT has also developed indicator monitoring systems based on emerging camera phone technology. In this paper, the technologies and the operational environment, in which the new camera phone based indicator applications are developed, are described.

From DReAM to Dollars

The presentation will focus on ‘Real Life’ machine installations and present the revolution from analogue to digital printing focusing on how specific industrial needs and met using the DReAM.One year ago at DPP2003 Reggiani Macchine presented our DReAM printer, this machine developed in collaboration with Scitex Vision and Ciba Specialty Chemicals introduced a novelty to the textile industry. The only digital printing machine designed for small production runs and high quality output: the DreAM.In fact our production speed is 150 m2 per hour with a printing resolution of 600 DPI.In 2004 at NIP20 we would like to present the evolution of our technology, essentially from inception to developmental prototype and focus on the industrial reality. Presenting under the session assignment of ‘Production Digital Printing’ we will illustrate the technological streamlining of our digital printing systems incorporating inline full cycle production situations developed specifically for some of our most avant-garde clients who together with Reggiani Macchine and our partners are clearly bridging the gap between analogue and digital realities in the printing industry. Integrating; preparation and finishing machinery, quality control and cutting instruments and the correct chemistry to ensure a high quality product at an industrial production level.