Achieving good and accurate multi-color overprinting in the printing process is very important for printing good prints. The national standard for cold-set ink offset printing of GB / T17934-3 newsprint indicates that the contour and position of the image of the multi-color version should be accurately matched, and the overprint error between any two colors is not greater than 0.15mm. The overprint error is less than 0.20mm, the overprint tolerance of fine print is not more than 0.10mm, there is no visible edge of the visual, the image is not falsified, and the resolution is good. Silica gel relative to the ceramic tableware, plastic tableware, hardware, silica gel tableware harmony together with temperature, in which food is cold is hot, can protect the temperature of the food itself, reduce the loss of the change of temperature and a period of time in the silicone bowl or pot food can still maintain the original temperature, when use won't convey the temperature of the corresponding to the user. Moreover, the particularity of the silicone material itself, which is different from other materials, makes the products produced by it have an amazing effect. For example, landing silent food containers, after high temperature cooking, will not produce harmful substances. And tableware but fold, can knead, can turn over, chuai also does not take a space in the pocket, also won't adsorb smeary. Its own desiccant effect, will not because of long-term storage and moldy, qualitative change. Silica Gel Plate,Silicone Placemat,Silica Gel TLC Plates,Silicone Gel Plate Ningbo Sunmoon Silicone Product CO.,Ltd , https://www.sunsilicone.com
There are many factors that cause inaccurate overprint in newspaper printing. Taking Roland machine UNISET75 as an example, the main factors that cause inaccurate overprint in newspaper printing are the following.
(1) The gap between the transmission gears of the machinery and equipment is large, which cannot meet the strict positional relationship between the rollers.
Solution: replace the gear.
(2) The roller bearing of the offset press is worn and vibrated, causing the position of the roller to change.
Solution: replace the copper sleeve of the bearing and roller connecting rod.
(3) Errors caused by imposition, printing and bending.
Solution: Re-imposition, copy and bend.
(4) The axial registration is inaccurate due to the wear of the positioning pin of the printing cylinder.
Solution: reinstall and correct the positioning pin position.
(5) The printing pressure is too large, the roller lining is not suitable, resulting in inaccurate overprinting.
Solution: Adjust the printing pressure and correct the roller lining.
(6) The paper is stretched and deformed after absorbing water, and the paper's wet edge (lotus leaf edge) causes overprinting to be inaccurate.
Solution: Control the amount of fountain solution and use olive rollers to prevent fan-shaped expansion of the paper. In severe cases, remove the paper with ruffled edges.
The types of inaccurate overprinting of color newspapers are irregular deviations of printed images, partial deviations of printed images, and regular deviations of printed image positions in the same direction. In view of various problems, it should be treated differently in production. The paper's own reasons, printing press accuracy, printing pressure, pre-press platemaking process, including the operator's skills and the equipment maintenance status of the printing press may all affect the accuracy of overprinting. factor. My company's Roland machine UNISET60 often has an M version drum. One of the two PS versions on the same drum regularly has axial registration deviation. In order to improve the registration accuracy, the machine staff uses scissors to modify the position of the PS version positioning hole to compensate for the overprint. Error is a solution taken after analyzing specific problems.
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Exchange of experience Quality control of newspaper printing overprint