Banner is a common way of advertising and public service promotion. A large number of customers are willing to use banners to advertise their information cheaply, simply, and clearly. By printing banners, screen printers can start with a meagre economic income and get involved in the booming advertising industry.
Banner printing has many methods such as manual, thermal transfer and discharge. Regardless of the craftsmanship, the banner world can add luster to the advertising industry. It is precisely because of this that everyone has to do it. Competition has also made banner prices drop to an almost unsustainable level. At this time, excavation is needed. Dark-colored cloth is printed with cover printing. Screen-blocking has plagued many screen printers. This article aims to solve the problem.
Dark fabrics are the most difficult to print, and cover printing paste is thin and can not cover the bottom, thick and block the net or dry net, the entire printing process are thick for the slurry, thick and difficult to cross the network and trouble. Especially in the summer when the high temperature and dryness are fast, 80 mesh nylon screens are used. If you print less than two words, you have to scrub the screen plates. If you move slowly, you will not be able to wipe them until they are discarded. Not only do you lose money, but the quality is not satisfactory. . If a word is printed on the net, it will be something that the operator has not tried. The time limit is not allowed.
In the process of solving this problem, I discovered that under 80 meshes, the wire diameters are usually thickened, which increases the thickness of the mesh; while the same monofilament plain meshes are easy to tear and break; non-monofilament plain meshes, pulps The material could not pass through the screen; if the auxiliaries were added in the thick paste, the cost of the paste would go up again, and the increase in the amount would not render the entire paste scrapped. Through continuous trials, it has been found that stainless steel wire mesh is an iron-nickel alloy wire, which has the characteristics of good ink quality, strong silk, small elasticity, resistance to acid, alkali, high temperature, no oxidation, and electrical conductivity. As long as the number of screen meshes is properly selected, Can solve the problem.
In the selection network, the sum of the thickness of the web and the thickness of the word film is the thickness of the printing paste, and the wire diameter and the weaving method are also parameters to be noted. The low wire mesh stainless steel wire mesh suitable for printing is indeed difficult to buy, with industrial meshes ranging from 70 mesh to 30 mesh, and only 20 mesh screen mesh (seed-proof) is the thinnest single screen. Silk plain, the price is less than 10 yuan / m2. After the test, the use of this kind of net, in addition to the banner before and after the need to wipe the wet surface of the net, the entire banner is printed without the need to wipe the net. For example: to print a banner with 10 square meters long and 10 words long on a red background, after the content is engraved, one person can complete it in 20 minutes, and can ensure clear writing and uniform ink. If many people combine, the speed can be increased. With this type of stainless steel net, even if an inexperienced operator is allowed to print, the quality of each banner is still good, and the pass rate is 100%.
However, the 20-mesh thin wire is also a need to pay attention. In order to prevent the wire from falling off, the following measures need to be taken:
1. Since the steel net can withstand greater tension, the steel net can be stretched tightly, and it is best to paste and nail into the method; 2. When printing, scrape with a small scraper and scrape it, and then use a big scraper to level the slurry. The glass plate or the backing plate under the banner should be flat and the pitch is 0; 3. In the printing, try to ensure continuous operation, do not leave the interval too long. To achieve these points is not without blocking the phenomenon of the net, a small amount of local light plug "Cross" negative pattern sometimes seen around the font, the reason is that the banner printing itself is not a paper film and screen, the word part of the continuous Replacement, the former surface of the printing surface of the residual ink in the printing of a word when the stroke coincide not less than together, not printed, it will dry up because of a longer interval, when the need to print the previous network will occur when blocking the net phenomenon. In the case where the screen center font coincides with a high frequency, there will be no occurrence of dry network or blocking of the network, and the probability of blocking the network will be much greater; the center part of the nylon screen of the regular printed banner is transparent; the stainless steel screen will be used. It is said that the probability of blocking the net is small and easy to clean. This is its two major advantages, and it is easy to regenerate and durable.
The author stopped the water after one printing. The water should be sprinkled on the steel net to keep it moist, and when the water comes, it should be washed again, and no water can be prepared. After the dried screen plate comes in water, it is boiled, pickled, or alkali-coated, and it is stripped off with a stripping solution. Rubbing with a solvent has no effect, and the stubbornness is abnormal. In the helplessness, I burned the nets. When I was burning the nets, I discovered that the plugging slurry was carbonized into ash at high temperatures. The burned steel screens were rinsed with water and used for banner printing. The silky style is strong and seems to be more fluid.
In the past two years, using stainless steel nets to print on banners has saved me a lot of time, manpower and materials. A steel screen plate was burned, burned, durable and unexpected. I hope that colleagues will not worry about the fact that they are stuck on the screen.
Source: China Silk Screen Professional Network
