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Why there is color difference during offset printing

Tyd: 2019-12-20 Tref: 74

Why there is color difference during offset printing

Because after the offset printing packaging printing Produkte, the pattern level is good, texture is strong, color is rich, the current packaging printing or the vast majority of offset printing. Modern offset printing machine multi - kleur een - tyd vorm doeltreffendheid, bevoordeel deur kliënte. Egter, verreken drukwerk het ook 'n noodlottige swakheid - in vergelyking met ander drukmetodes maklik om chromatiese afwyking te produseer. It has high technical requirements for the operators of offset printing, especially the control of ink balance, veral die gestandaardiseerde data-operasie.

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As 'n packaging printer, we must pay attention to the color difference in offset printing, ontleed die oorsake van kleurverskil noukeurig, and take effective measures to overcome it.

1. The effect of paper on color

1) The whiteness of different paper on the printing ink layer color show different effects.

2) The gloss of printed matter depends on the gloss and smoothness of the paper. As die glans en gladheid van die papier hoog is, we observe that the color is basically reflected through the ink layer, the main color saturation is high.

3) The same color of the ink, onder dieselfde omstandighede, printed to the absorption of different paper will have different gloss and color printing.

2. The effect of paper surface treatment

Packaging printing in addition to printing, there are a lot of post-press processing technology, wat is 'n aansienlike deel van die papier oppervlak behandeling, including film (ligte film, subfilm), glans, kalender, Olie, Lig, en so aan. Printed matter after these surface treatment, there will be different degrees of color changes. Dus, as the packaging offsctdruckereien printed matter, if there is post-press processing process, post-press processing must be considered into the physical and chemical changes, om die digtheid van die inklaag en L*a*b* te bepaal.

3. Printing process operation

Die invloed van droë regressiedigtheidswaarde, benatting vloeistof grootte, printing speed, drukdruk te druk.

4. The effect of bad printing

Printing plate is one of the quality of copy. In the printing process, only the plate of good reducibility, deformation, wear and tear to ensure a better layout of ink transfer stability.

5. Die effect of bad roller

Offset printing technology, printing can get uniform ink, cots quality has a very important role. There are three kinds of cots: transfer roller, uniform roller and inking roller. The roller's elasticity, viskositeit, center, hardness and surface finish, largely determine the quality of ink printing.

6. The effect of light source characteristics

Offset printing in the observation of color must have a light source, no light can not see the color, but if the characteristics of the light source is not the same, then the color difference will be very big. Oor die algemeen, our requirement is to view color in natural light (i.e. standard light source). If the use of ordinary light bulbs as a source of color, then the color will appear yellow, it is difficult to accurately identify the color, the final printing will produce serious color slant.

7. The effect of ink blending

Verpakking offset in addition to four color ink, there are also monochromatic ink. Monochromatic ink is generally required to print their own deployment. Then, we must record every printing ink formula proportion, to have data control - record the ink product name, dosage. 

8. The effect of bad equipment

Keep the machine good performance, is to improve the quality of printing ink reliable guarantee.

In short, the reason of color difference, we must combine the actual work of the situation, analysis and study, find out the solution, make the packaging of offset printing products as much as possible to reduce the chromatism, guarantee in allowed within the prescribed scope of color, to improve the packing quality of offset printing products, to meet customer demand for us.

For more information about BPC Book Printing, please pay attention to www.bookprintingchina.com.