Because of the distance between the screen plate and the substrate, the screen printing plate produces a reaction force against the squeegee blade by its own tension, which is called resilience. Due to the effect of resilience, the screen plate and the substrate are brought into movable line contact with each other, but the other portions of screen printing plate are separated from the substrate. In this way, the ink and printing screen undergo a cracking motion, which ensures the dimensional accuracy of printing and avoids soiling substrates. When the squeegee is scraped across the entire plate, it is raised along with printing screen plate and then scrapes ink back to its original position. This is a printing stroke.
Code block of international signal flags
The so-called international signal code block refers to an independent signal composed of 2-4 flags. Sometimes a complete meaning can be expressed by only one code, and sometimes it needs a number of code groups.
The significance of the international signal code block is described in the International Signal Rules. Most of the boats will be equipped with several sets of international signal flags and International Signal Rules to facilitate regional visual communication. However, what listed in International Signal Rules belongs to the "civil communication rules", so the interpretations of signals are only applied to civilian vessels. For warships, the meaning represented by the flags will be completely different. Each navy will compile its own password signal book and replace it regularly. During wartime and combat training, warships will contact each other with unique signal codes to ensure the confidentiality of communications.