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FREE SPECIAL CONTENT: Niels M. Winther, President and CEO, Heide
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Technology In the final 2 decades, electrophotography has evolved on the point where it truly is a legitimate option to analog print production technologies for instance offset lithography. Electrophotography’s lack of your permanent image master provides unique advantages over analog printing methods, including reduced makeready as well as the chance to vary information from a single page to your next. Several manufacturers have entered your production digital printing market because these advantages. The Relationship of Paper and Press Both offset lithography and digital printing processes face substrate challenges. These challenges may be separated into four broad categories. First, the substrate must run throughout the press. Second, the substrate must accept the ink/toner, at the same time because the approach to application, without undesirable effects. Third, the task must provide suitable image quality. Fourth, the printed piece must in a position to withstand the rigors it will probably be put through throughout its intended use. Technical Considerations Offset lithography faces numerous substrate challenges; however, there are unique differences inside role that substrates play inside digital printing processes. Since toner is deposited for the substrate primarily using electrostatic charges, the two design from the press and also the conductivity with the substrate have to be considered. The moisture content of the substrate created for digital printing is critical because moisture level affects the dielectric properties of the substrate. The moisture level has to be low enough so the substrate maintains its dielectric properties while holding a sufficient charge make it possible for toner transfer. However, substrate moisture level is not too low, as this will likely cause an excessive electrostatic charge that disrupts transport. On the opposite hand, in the event the moisture level would be to high then this substrate will stop in a position to hold a sufficient charge, contributing to poor toner transfer. The substrate must even be in a position to hold the best charge throughout the transfer phase. Therefore, electrophotographic devices have to be made to preserve optimal paper conductivity through the entire entire printing process. Physical properties on the substrate may bring about printing difficulties in electrophotography. Dimensional stability on the substrate in the printing process is closely associated to changes in moisture content, which may come to be related to your fusing process. Dimensional stability during transport becomes critical in duplexing, because the substrate is cycled with the printing system an additional time. The surface finish from the substrate is additionally important. Unlike lithography, in which a liquid ink penetrates the outer lining in the substrate, toner need to be drawn to the substrate by electrostatic charge using the aid of physical mechanisms. One with the most crucial concepts of digital printing is always to develop a complete document, plus the production of any complete document with an end user typically involves some sort of finishing. Due on the fusing process, digitally printed sheets have lower moisture content than lithographically printed sheets. This can result in increased static and sheet curl issues that restrict finishing processes. Grain direction is an additional critical part of digital substrates because substrate stiffness has a affect on transport. It is usually a good printing practice to think about grain direction on the end use in the product back through any finishing steps, and, to your print engine. However, from time to time the substrate grain will stop from the ideal direction for transport, and other waste can be incurred to resolve the press and finishing conflicts. Table 1 summarizes the relationship between several common substrate properties, conditions that affect those properties, and digital press performance. ,custom cardboard boxes office supply set
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