From Seven In Doing The Four-color Offset Printing Color Overprint Small - Printing Is A Small

Color offset printing color overlay, whether it is for the machine

, or for operators who have very high demands. Only master overlay technology, equipment and printing supplies have excellent conditions, can print out the fine print quality.

Print Network HC Currently, there are many small and medium manufacturers use color printing Offset To overlay color live, the simple overlay color printing products, in general, single-sided four-color overprint were mostly, but some are negative overlay printing eight colors. This requires printing high-quality, high precision, but also demands more sophisticated printing technology operator, and the chromatography process should pay attention to:

1, paper Paper printing process is one of six elements, the pros and cons of paper directly affects print speed and print quality. First asked the paper to be flat, cut to the same size, and straight angles and straightness errors are relatively small. Books used for printing a single sheet of paper, format size (width length) error less than 1 mm, for printing album covers and more sophisticated, format size (width length) error should not exceed 0.5 mm, and indicate the orientation side, that the rules side, the smoothness of paper is the degree of smooth paper surface smoothness of paper and decided to Blanket Close degree of contact is clearly printed in the same pressure, the use of low smoothness of the printed paper product printed graphic clarity poor, for example, the same printing conditions, the use of coated art paper using the patterns than the paper printing effect is good; paper moisture content of 6% -8% required between the paper with no excessive surface tension and surface strength of lower plasticity increase, imprinted ink film curing delay. Water content is too low, then the paper prone to static electricity, and tend to rigid and not conducive to printing. Uneven moisture will form a tight side, lotus leaf, curly or uneven surfaces such as deformation of the printing creases and other faults will appear. This requires the printing shop has the right temperature and humidity, generally require the temperature control in 18 -25 , relative humidity remained at 50% -60%, which are conducive to the preservation of paper and printing smoothly. In addition, the paper itself, the fiber type and pH will also bring a greater influence on the print.

II ink Ink viscosity and fluidity for the printing quality has an important role. Mobility and viscosity of the ink has a close relationship, increasing the viscosity of ink will also reduce its liquidity, and vice versa to improve liquidity, consistency does not mean a large ink viscosity, viscosity of the ink is not necessarily dense, only the viscosity of the same ink, the greater the mobility of consistency worse. Mobility is too small, the transfer ink printing process is not smooth, uneven, causing the surface before the light after printing and other ink deep fault; mobility is too large, imprinting is not an accurate transfer, graphic level is not clear, ink is not full, brilliant color is not clear, while the flow of ink is too large can lead to frequent bars dirty version and ink production. Printing process can be adjusted through the use of ink to adjust the ink viscosity and flow, but should not have to make printed quick-drying ink to add to the corn meal. Can also be used to achieve the purpose of quick-drying ink. The printing process, to adjust the ink viscosity and mobility. Save ink printing has always been a more troublesome problem, because the ink in the air for a time longer, it will be easily oxidized by air and formed a thick layer of ink skin, taking in the next printing ink must be Mexican skin scrape, a part of this is bound to waste ink. Measures taken to printing generally added to the cartridge a certain amount of water, to avoid ink contact with air. But in fact the oxygen contained in water oxidation will be the ink, and the longer the contact time of water and ink is easy to emulsify the ink, when the machine is not on the printing ink when the phenomenon occurs, although to ink large one, but uniform roller (mainly hard roll) is still on the ink. Recommended ink save, use wax paper to separate ink in contact with air, or use Plastic Paper to seal, wax paper or plastic paper be posted on the ink surface, before the next printing of paper torn off waxed paper or plastic can, but do not use plain paper to seal, to avoid tearing the paper when exposing paper brought trouble.

III Fountain Solution

Fountain solution is the role of a blank part of the wet plate, and the formation of metal oxides or hydrophilic salt layer, using the principle repel ink in the blank part and establish a barrier between the ink, the ink stick pollution plate blank part. General requirements fountain solution must be a weak acid medium, adjust fountain solution of the PH value of between 5.0-6.0 is appropriate.

by: gaga

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