The reason and solution of color printing ink layer
We are a big printing company in Shenzhen China . We offer all book publications, hardcover book printing, papercover book printing, hardcover notebook, sprial book printing, saddle stiching book printing, booklet printing,packaging box, calendars, all kinds of PVC, product brochures, notes, Children's book, stickers, all kinds of special paper color printing products, game cardand so on.
For more information please visit
http://www.joyful-printing.com. ENG only
http://www.joyful-printing.net
http://www.joyful-printing.org
email: info@joyful-printing.net
The uniformity of the color ink layer on the color print directly reflects the quality of the product. In particular, multi-color overprinting and packaging printed matter mostly uses a large-area layout as a substrate, and its printing receives a large amount of ink. If the process technology is not well mastered, it is difficult to print a uniform and uniform ink layer. Not achieving the desired results. A high-quality color printing product should give people a visually beautiful feeling in appearance. This beauty is first felt from the brightness and uniformity of the printed ink show. Some operators have insufficient experience in craftsmanship. In order to overcome the unevenness and fading of the ink layer on the printing surface, the amount of ink is often blindly increased to meet the bright and thick visual effect of the printed ink layer, so that the printed ink layer has passed. The bottom, the imprint is not strong and the ink film is crystallized and other adverse consequences, which is the mistake of the process operation technology, must pay attention. The following is an analysis of several cases of ink layer blooming:
1. The printing paper is not evenly smeared, and the ink layer on the printing surface is caused by the difference in the smoothness of the paper.
Process practice shows that the paper has a large amount of ink absorption. When printing paper with poor surface smoothness. The surface ink layer is prone to flowering. This is because the paper fibers are interlaced to produce a certain gap and are not well covered by the coating layer. Thus, there is a contact failure between the paper surface and the ink layer on the surface of the printing plate during imprinting. In this case, if it is considered that the amount of ink supplied to the printing plate is insufficient to blindly increase the amount of ink, it is bound to cause the printed matter to be dirty. Failure is not advisable. Instead, increase the printing pressure by appropriate. A uniform and sufficient embossing contact condition is achieved between the paper having poor smoothness and the printing ink layer, thereby achieving better elimination of the fading phenomenon of the ink layer of the printing plate, and ensuring uniform and uniform printing of the ink layer.
2.Tthe printing plate bottom is not solid enough, the printing ink layer is weak due to weak printing pressure
As far as the embossing printing process is concerned, what kind of underlay is used, the transfer relationship of the printing ink layer is great. The test and process practice clearly show that the traditional backward plywood is used as the printing plate bottom, which not only has many drawbacks (such as low printing plate printing rate, inaccurate printing, etc.), but also easy to produce poor ink layer transfer, causing the layout. Inconsistent and insufficient ink layers occur. This is mainly because the wooden base itself is not strong enough, and the possibility of compression deformation is large, resulting in unstable printing pressure, and the ink layer on the printing plate cannot be uniformly transferred to the printed sheet. This situation tends to make people mistakenly believe that the ink supply is insufficient. On the other hand, due to the poor flatness of the wooden bottom, the normal ink and ink transfer of the layout cannot be satisfied. If a multi-layer plywood is used as the bottom support, when the solid proof is taken, the thickness of the ink layer of the whole layout is often very different. Some of the layout parts are obviously colored, and some parts are slightly lighter, giving inspiration. The illusion of uneven printing. After increasing the amount of ink, the visual effect is better, but it is also very easy to cause sticky products, and it will cause undesirable defects such as overprinting. The best way, in addition to carefully putting the padding technology off, for printing larger areas of the plate, such as the format of 16 or more, it is better to use a flat and solid metal plate, which can better prevent The phenomenon of ink color on the layout.
3. The rubber roller is hard or the position of the ink roller is poorly adjusted, and the ink layer of the layout is caused by the uneven ink transfer.
Color printing is usually a multi-color overprint product with a large layout and a large amount of ink absorption. In large-format printing, a uniform and moderate ink coating is required. If the rubber roller is hard, uniform ink transfer and ink discharge cannot be achieved because of the glue. The hardness of the roller is weak, which is not conducive to ink transfer. On the other hand, the transfer roller, the leveling roller and the inking roller are not well bonded to the ink fountain roller, the tandem iron roller and the printing plate, respectively, and are also the cause of the ink color on the printing plate surface. In this regard, careful analysis and inspection should be carried out one by one, and it is found that there is a gap in the adjustment, and the gap should be re-adjusted. For the gap caused by the wear of the shaft head and the shaft hole, repair measures should be taken. In this way, it is better to avoid the phenomenon of product layout caused by ink transfer and uneven printing, and to ensure the printing quality.
4. The anti-adhesive agent in the ink is not evenly stirred, which causes the ink-repellency of the printing surface to be weak, and the ink layer of the printing layer is caused by poor ink transmission.
Printing plate products, after adding anti-sticking agent to the ink, can play a certain anti-sticking effect. If the amount of the anti-adhesive agent is too large, such as more than 4% or the anti-adhesive agent is not evenly mixed in the ink, and can not uniformly penetrate into the ink, the coarse anti-adhesive agent is transmitted to the plate, which affects the printing plate. Ink-to-ink, the color of the printed product will be hair-like after printing. Therefore, if you want to use a good anti-adhesive technology, you should first apply an appropriate amount of varnish or varnish to the anti-adhesive agent to be added to the ink and then add it to the ink. Such a fluid anti-adhesive agent is more likely to penetrate into the ink, and not only can receive a good anti-sticking effect, but also can avoid the occurrence of the fading phenomenon of the printed ink layer.
In summary, as long as we are in the process of practice, good at summing up the experience and accurately understanding the various causes of the ink layer of the product, we can better avoid the blindness of the process operation, thus ensuring the printing efficiency and Product quality improvement.