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All aspects of print quality inspection


Color performance is more consistent. 6. Check quality of printing down. Should check the specifications of the main layout, text, images, whether the printing process requirements; check the accuracy of sets of printing down, graphic depth is uniform; check the accuracy of printing down position, locking and positioning rules are used to meet the printing requirements; layout map Wen, dot, line is uniform, smooth, not flowers, not paste, easy to dwell; layout is clean and smooth, no dirty spots, no trace road, no bump marks.Second, the quality of printed checks 1. Using Cross Regulation ray layout overlay situation. General offset printing, in relying on the body, and drag outward slightly at the plate on the side of a number of cross-proofing and line regulation, and the best paper in the pull-side rules to regulate cross-proofing and line, so that when the cutting edges appear wavy edge, they can accurately pull the printing process checks compliance work is stable. Usually cross lines should be placed beside the incision products (other than at the finished product specifications), which is used as the upper and lower horizontal line (vertical) of the overlay rules, and are used to come and go vertical (axial) of the overlay rules, as long as the colored version Regulation line overlay, the printed version of the basic overlay of the graphic also. Therefore,[link widoczny dla zalogowanych], the cross line of the sheets can also be used to check the rules, if accurate and consistent positioning, can be removed from part of the semi-finished products, the trace deviates from the vertical edges, and hit the seams, edges together to observe the upper and lower rule curves are quasi-homogeneous, we can check Vertical printed sheets accurately or not; drag parts of the lateral edges slightly deviates trace, hit Zillah regulatory edges, you can check the direction of the printed sheets come and go is accurate. 2. Use of color, the signal shall check the color of ink colors and printing the defective products. Side of the color printing blocks, ink and printing can be used to compare samples are the same. Condition of relief because the dot product, dot size in the graphic very different context, is difficult to directly compare the color, with color can be more directly compared. Leakage can also be used as color block color, white pages,[link widoczny dla zalogowanych], check page to be printed down the basis of standard colors as long as the block is complete to see, location is correct, you can quickly check out a variety of defective products. Color plates should generally be in the lower right corner, upper left corner and dragging a little edge, and the colors of the color blocks arranged in consecutive order. Width 5ram general about color, long 8ram around sheets of paper attached to the outside edge at the finished product specification. Determine the make-up position, to the edge of color also signal bar on the sheets, test strips. Digital signals are commonly used round standard Article and star pattern signal bar. Is both the most widely used signals, two features of the Brunner test five paragraphs signal, test strips, and with the ratio of testing, use of better detection. If the use of chromatography can accurately compare the sample and the actual printing printing ink between the hue, brightness and saturation differences. 3. Check that the product is dirty from the phenomenon. Dirty products is offset from the printing process occurs in the common faults, in general, try to control the printed layout less water, like the intrinsic quality of print products, but the dirty water from the prone to the shortcomings of print, it is worth attention. Therefore, each sampling time,[link widoczny dla zalogowanych], as long as the first to see the amount of ink printed sheets seams, corners, or the relative area consumed more ink status, you can find the quality of printed session Ⅱ, because these areas are the most prone to play dirty. If it is aluminum print, paper-based optical reflectivity as a larger, slightly before printing, and color ink from dirty play dirty, not easy to detect, so check, you can change the sheets careful to observe a variety of perspectives, but also in time found from the dirty phenomenon. 4. On the text, site layout ink uniformity checks. Printed text, site layout of the printed materials, the ink film thickness and uniformity on how, sampling inspection, can be on both sides of the sample sheets and proofs before the middle of smoked compared to see whether the shades of ink between the sheets. Meanwhile, we must carefully observe whether there are flowers layout version, paste version, and other ills, in order to take appropriate measures to deal with, to ensure the stability of the quality of the batch. 5. Check sheets layout of the network definition. Network is the smallest perception of the printing unit of the human eye can not be observed. Observed with a magnifying glass network printing appears on the full, strong, clear instructions and good printing restored. Conversely, if the access point of printing gray hair,[link widoczny dla zalogowanych], fluff, white point,[link widoczny dla zalogowanych], then printing and reproduction quality is not good, then check the bag lining should be noted that the characteristics of printing pressure and other factors is appropriate. 6. Check the layout of the printed sheets textured tone. How effective copy sheets, magnifying glass, check the forum can be high, medium and low levels of the three netted section to see print runs high on the parts of the network without loss of light, halftone dot reproduction level of effectiveness, whether the paste out of the dark tone network in order to take timely measures to correct it.

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