Flag making method and equipment technology change
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Flag making method and equipment technology change

Release time:2022-06-11 13:29 view:96 次

The history of the flag is a history of human civilization. The making method of the flag has also progressed with the development of science and technology. However, it has always been a secret "craft" rather than "industry". The application of digital technology has revolutionized the flag making industry and unveiled its mysterious veil to us.


Today, most flags are still printed by screen printing, which is the most economical way for small format, large quantities of national flags or organizational flags, as well as flags used in commemorative activities.


As for the small batch (called short version in printing) flag production, the digital method, specifically ink-jet printing, is a more economical method. After all, the ink-jet printing method does not need to make a screen version, and for non monochrome flags, especially those with color gradients or detailed and complex patterns, because they are printed at one time, they do not need to be overprinted like screen printing, The flag printed in digital mode has better color and more accurate pattern.


At present, the fabrics used in the banner are all kinds of polyester fabrics. Such fabrics are superior to cotton, silk and other fabrics in terms of physical indicators such as fastness, wrinkle resistance and cost. The early digital method, that is, relatively more traditional, is to use the method of heat transfer printing, first through inkjet printing (commonly called inkjet photo in the advertising industry) or electrostatic photo (Xerox and 3M are the earliest owners of this technology), Disperse dye ink (although called dye ink, the ink is more like pigment ink, which is a granular dispersion rather than a pure water-soluble solution of ordinary dye ink), is printed on a special paper (commonly known as heat transfer paper), and then transferred to the flag fabric through a heat transfer machine. Finally, the material is cut and sewed to make the flag finished product. The heating temperature is about 200 degrees, and the transfer time is about 20 to 30 seconds. This process, The solid granular special dye, once again, directly turns into a gas under the temperature, meets the polyester fiber and combines with the fiber, which is a typical physical so-called "sublimation" process (referring to the phenomenon that the solid substance is directly converted into a gas without going through the liquid state). Therefore, this process is called "thermal sublimation", and the disperse dye ink for such purposes is also called thermal sublimation ink.


In recent years, there has been a direct injection method. Of course, the ink is the same, but there is no need for heat transfer paper, which saves costs to a certain extent. But this also has problems. Because ordinary polyester fabrics can not absorb water-based ink, the fabrics used need special treatment. Customers often rely on specific fabric suppliers, and their prices are higher than those of untreated fabrics, In addition, its effect is slightly worse than that of transfer printing. Another problem with direct printing is that when the ink is not completely dry, the cloth is rolled up, and the adjacent layers of fabrics will cause color bleeding between them. Therefore, some manufacturers have made special "on-line" heating and fixing equipment, which is attached to the photo machine. After printing, the color is directly heated and fixed, and then rolled up. This is not enough, The fixation effect is worse than that of a large human transfer machine.

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