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How to control color printing sticking on the back

  prints dirty is the common fault in color printing. Such failures occur, ranging from affecting print quality, result in large quantities of scrap, brought great losses to the enterprise. Led printing dirty for many reasons, such as printing ink layer thickness, the paper is too smooth, improper inking and printing pressure does not apply. Reasons for dirty ink features, also associated with environmental temperature and humidity. Only serious technical control to ensure product quality.
1. Correct understanding of printing pressure relationship with ink film thickness
suitable printing pressure is an important condition for achieving uniform layout ink transfer suites inadequate or uneven pressure will affect the uniform transfer of ink layer. Print layout in inadequate or uneven pressure, flooding and printing ink, the whole layout ink thickness are not consistent. Increase the amount of ink, can make up for the shortage of printing pressure caused by the layout layer defects arising from poor contact with the substrate, but is also easy to cause printing dirty. So you should adjust the printing pressure, adjust layout ink quantity, so as to get a good printing result.
2. Handling paper printability and deposit relationships
surface smoothness of paper and ink absorbs quickly, large amount of ink. When the paper is printed, if there is insufficient pressure or uneven printing after flooding and threadbare, increase the amount of ink, ink layer too thick, slow drying of imprinting, prone to sticking. On surface smoothness of paper and printing pressure should be increased; good on smooth surface such as paper, glass, cardboard paper, ink layer should be as thin as possible, to avoid sticking. From the perspective of anti-sticking, printing a large area of charts should be used "thin deep ink printing", which got darker ink color, ink thinner, so that can meet the requirements of printing color, and prevent sticking.
3. Master plate features and the relationship between printing ink thickness
plate quality, printing ink film thickness and pressure has something to do with layout poor smoothness, its printing ink layer and pressure required and vice versa is small. Such as zinc in printing, ink because of its pro-poor, poor gloss, only increasing pressure and ink film thickness, in order to achieve the effect of printing ink is full, but this can easily lead to dirty, so should not be used in art more than printed Octavo format color printing products. Imprints due to surface gloss and softness, smoothness and good ink, printing ink thinning, can still achieve good printing effects, and less prone to sticking. So, when printing large areas of an image using imprints.
4. Avoid printing ink thickness caused by improper sticking on the back
determines whether printing ink layer is moderate, mainly in the print layout pressed uniform layout ink evenly not to show, not the virtual printing and printing consistent color and artwork as the main basis. If uneven pressure or insufficient, poor printing gloss paper, prints the original hue of deep, ink color got light may lead to printing ink layer thickness determined accurately, if blindly increase the amount of ink, prints due to the too thick ink layer sticking on the back.
5. Avoid operation improper and caused of printing products stick dirty
(1) ink roll adjustment improper, ink volume had big or not uniform
Dang ink roll head, and axis hole for wear appeared larger clearance or has eccentric Shi; Dang ink roll colloidal elastic variable poor Shi, ink roll in along layout scroll brush ink process in the and layout contact not uniform, easy caused local layout brush ink not are, appeared ink layer partial thin phenomenon. In addition, if adjusted too high or too high rollers, but also easy to make inadequate or uneven ink layer coating, if blindly increase the amount of ink, is the local layout ink layer thickness leads to dirty. When printing large areas of chart products requiring high precision rollers, Cot roundness, and cots colloidal appropriate hard and soft, uniform contact with rollers and ink roller, the level of regulation should be accurate in order to reduce the chance of prints dirty.
(2) improper delivery
printing format, paper is soft and accurate adjustment falls paper angle and height, otherwise copies in its edges rubbed on to a printed mark, makes printing ink surface damage. In addition, printed copies should be beat with care, prevent the sheets to move up and down, friction caused by sticking dirt. Depending on the ink of the print layout, number of the master, as appropriate, to dry paper to prevent sticking the pressure.
(3) plate bottom false, uneven
plywood material pressure firm enough compression coefficient, if the use this material to make plates of the bottom must increase the pressure, and ink thickness, so it is very easy to make prints dirty. Best printing field without backing of plywood should be used in magnetic version or other metal backing, printing ink layer is thin and not to spend, to prevent sticking.
(4) paper's acidity is big, wet, prints not dry when
printed with offset or some China-made coated paper, acid due to printing ink layer thick, paper, ink not dry, prone to sticking. At this point, should include in the ink drying oil, prevent prints from sticking dirty.
(5) friction
printed bond paper, due to the paper's surface smooth, tapping on the paper creases, and easily imprinted friction and sticking. The tapping should be master, as appropriate, depending on the layout structure, the paper characteristics. Thick art paper, try not to knock, only by rubbing or kneading, rubbing the straight, strong paper.
to sum up, cause color printing in the print is dirty for many reasons, as long as we are technically good close, not only receiving good anti-sticking effect, but also to improve the printing quality and production efficiency.

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