In recent years, with the popularization of four-color machines and multi-color machines, most of the multi-color printing work is completed on the multi-color machine at one time, which greatly improves the production efficiency and printing quality. Jobs that can only be completed by "pipelining". For example, some five-color prints need to be overprinted with spot color inks such as gold or silver on a large area of ​​dark ground. The ink color is thick and bright, and the gold and silver inks should have a strong metallic luster. If such jobs are printed at one time using a five-color offset press, it is actually more difficult to achieve the desired results.
As we all know, multi-color offset presses are "wet-on-wet" overlays, and dark solids are often two-color or even multi-color overlays. The ink layer is relatively thick, and printing is inherently difficult, plus It is more difficult to stack gold and silver ink on it. Because the transferability and adhesion of gold and silver inks are relatively poor, overprinting onto thick and wet ink layers is prone to imprinting defects and the loss of metallic luster of gold and silver inks. There will also be a phenomenon of "reverse overprinting". In addition, because the chemical properties of gold and silver inks are unstable and the transferability is poor, printing in the "wet pressure wet" state must reduce the speed of the printing press, which greatly affects the production efficiency of the multi-color machine.
Most printing companies will try to avoid such low-efficiency and poor-quality printing methods. Generally, two printing methods are used. After the four-color ink printed first is dried and then printed on the machine, the gold and silver inks are printed, and the quality can be obtained. Very good guarantee. However, if a four-color machine is used to print twice, there will be several color groups "run empty", which is too wasteful and less efficient. Therefore, a four-color machine and a single-color machine are generally used in the "flow operation" production mode, which not only ensures the printing quality but also improves the production efficiency of the four-color machine.
In terms of the combination of printing machines, in order to ensure the accuracy of overprinting, especially for the difficult printing of overprinting, the author still advocates choosing the same type of monochrome machine and four-color machine for use. However, we have also tried different combinations of offset presses. For example: after printing by Heidelberg four-color machine, it is also good to print gold and silver ink with one "08" machine. For thicker cardboard-like prints, the "print" changes more, so it is more difficult to control, and must be paid enough attention.
Although the "printing operation" of the offset press has certain difficulties, as long as it is bold to explore and dare to practice, it can be completely mastered.
Here you can find the related products in, N95 Face Mask ,KN95 Face Mask ,Earloop 3 Ply Surgical Face Mask ,Medical Surgical Face Mask, KN90 Face Mask we are professional manufacturer of Disposable Face Mask. We focused on
international export product development, production and sales. We have
improved quality control processes of Disposable Face Mask to ensure
each export qualified product.
If you want to know more about the
products in Disposable Face Mask, please click the product details to
view parameters, models, pictures, prices and other information about
Disposable Face Mask.
Whatever you are a group or individual, we will
do our best to provide you with accurate and comprehensive message
about Disposable Face Mask!
Face Mask
N95 Mask,Surgical Mask,Earloop Face Mask,Disposable Protective Mask
Ningbo superclean environmental technology co.,ltd , https://www.supercleanmedical.com