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There are many analog and digital methods for gravure proofing, such as SOFT PROOF, BLUELINES OR OZACHROME PROOF, OVERLAY PROOF, SINGLE SHEET PROOFING, and OFFSET proofing. PRESS PROOF), DIRECT DIGITAL PROOF, and GRAVURE PRESS PROOF. The following briefly describes the characteristics of these methods, and focuses on the proofing method of the machine.
First, common gravure proofing method 1. Soft proofing Soft proofing is a less strict term used to describe the process of color reproduction from a video display monitor, representing a monochrome page, and synthesizing color pages. The pattern of soft proofing can be observed from the terminal of a plate making company or a printing factory, or it can be used as data for viewing elsewhere. Because this proofing method has certain limitations in terms of the resolution, image size, color range, and the relationship between the actual sheeting effect, it is only used to detect the position of the layout, the color and order of the sheets, and the correctness. The degree of sexuality and color correction. Due to the accuracy problem, soft proofing cannot be used as a means for customers and printers to finally determine quality.
2. The blue line proofing blue line proofing is based on the final output positive or negative film to obtain the proofing method of the paper proof by exposure. It serves as a test to check if all the information is in the correct color and position. Different shades of color can be obtained by changing the exposure time, so there is a color change (mutation) between the two colors. Since it is a monochrome image, four colors cannot be displayed on the same print, and this type of paper is not stable enough to be used for accurate error measurement. Sometimes the proof also uses "brown lines."
3. Overlapping Proofing Overlapping proofing has been used for many years. It uses transparent multi-layer positives to detect images. During proofing, the negative film of each color version is used as an original document to expose the corresponding color film. The dye on each color film is developed to obtain a corresponding positive image, which can simulate black, yellow, cyan or magenta and other spot colors. The four color positive films are superimposed to synthesize a color proof pattern. All proof register lines and trim gauges can be displayed on the proofing film, but its accuracy is not sufficient for the detection of critical colors.
4, sheetfed proofing sheetfoil proofing commonly used three systems: Crolimin, MATCH PRINT, SINGATURE PROOF.
The Cromarin proofing system is a multi-layer film color proofing system that uses an unbleached photosensitive resin layer and exposes it under a UV light source. The final sample is composed of toner, sequential photosensitive layers or colors. Toner can mix almost any ink hue.
MATCH PRINT is a sheet-fed color proofing system for color publishing and commercial printing. Each color positive film or negative film undergoes exposure and development and can be synthesized as a proofing product. However, the system has certain limitations in using spot colors.
SIGNATURE PROOF is an electronic imaging system that can use any coated printed material as a substrate. This proofing system enables independent dot gain and density control under near-real-world printing conditions.
5, Offset printing machine proofing Offset printing machine proofing is used for the preliminary determination method of gravure cylinder engraving quality, which has been widely used by advertising manufacturers and gravure printing manufacturers. After the proofs have been printed with the offset press, if there are still unsatisfactory points, they can be modified on the pre-proofing system and then gravure printing.
6. Direct Digital Proofing Direct Digital Proofing is a more important method than a few proofing methods. Direct Digital Proofing, also known as DDCP (DIRECT DIGITAL COLOR PROOFS, Direct Digital Color Proofing), uses inkjet and electronic imaging printers that use digital technology to obtain high resolution halftone proofs directly on thermal transfer materials, eliminating the need to use them. Intermediate film steps. This proofing process is fast, subtle and clear, but the range of color rendering is limited.
The history of color digital proofing is a history full of stimulating stories, incomplete promises, damage to reputation, and costly investments, but it is also a history of belief, endurance, and ultimate success. At the earliest, many well-known companies have formulated development plans to strengthen their market position in this area. However, many companies have experienced problems. These problems are mainly related to productivity, reliability, and user convenience. Now the main problems have been To solve, the actual situation is that if you use skilled operators, gravure digital proofing can get very good results, especially for publishing gravure. Therefore, some companies have taken the lead in abandoning the gravure proofer and have completely adopted digital proofing without film.
7, gravure proofer proofing In any case, gravure proofer proofing is the final confirmation gravure plate quality and gravure effect of the closest proofing form. For some of the most demanding color printing products, despite the high cost of proofing, it is still considered the best final proofing method. (To be continued)
Comparison of Gravure Printing Methods (I)
The proofing of the sculpted concave roller prior to printing is critical for the quality communication of the engraving roller, for the roller itself to replicate and for its conformity check. The gravure proofing technology must have a high degree of flexibility in order to meet the reproduction requirements for a variety of substrates and inks for different products. These products may be publications, packaging, labels, wrapping paper, folding cartons, paper bags, etc. The proofing materials may be paper, paperboard, film, aluminum foil, composites, and various coating grades and surface properties.