Powder spraying is an indispensable tool in offset printing. The printing powder on the market is mainly made of pure plant materials. Commonly used materials are flour, corn flour (corn starch), plant starch, cassava powder, etc. Its main function is to prevent the back of the printed matter from being sticky and dirty during the printing process.
Powder spraying particles are fine, and have good assimilation with ink. After spraying, they are evenly dispersed, which is very helpful to improve printing quality and printing efficiency! It is widely used; except for color printing, film, rubber, nylon and composite materials can be used. The powder particles are spherical; the surface is smooth; the particle size is 10-25m (item 300-450); the uniformity of powder particles; the fluidity and dispersion are good; it is assimilated with ink and has good lipophilicity. Completely and effectively evenly coated on the printing surface to ensure the printing quality.
So why spray is used in Jinan label printing?
Because of the printing speed of 15000 per hour, it is amazing on the high-speed paper feeder, and also because of the stability, accuracy and flatness of its paper, because the printing samples are stacked on the paper platform without any sticky dirt. General printing machines are equipped with appropriate powder spraying device to facilitate printing in the case of thick ink layer. Ink with slow drying speed or fine and high-grade printing products are used for powder spraying to prevent printing products from sticking or sticking to each other. High quality electronic powder spraying has become the standard of high-end printing machine, which not only improves the quantity of label printing quality (powder is more evenly distributed in printing products and powder is more reasonable), but also saves a lot of powder and reduces dust. The electronic powder spraying device is more user-friendly. The powder spraying range and time can be adjusted according to the paper format through the touch screen to further ensure the printing quality.
Sometimes operators in order to reduce the sticky problem of printing, is used to increase the powder spray method, which will affect the gloss of stickers, pollute the working environment, and also increase the dirty parts of paper machines, resulting in serious wear and tear of printing and machine will have a negative impact.
The principle of powder spraying control is to make the upper and lower printing just not stick to each other in the effective part of printing, so the powder spraying amount is the best powder spraying amount, the main reason is that the printing surface ink is not completely dry. If the ink is dry, it's useless to sprinkle it again. When the printer is testing the printing, it is an essential work to check the quantity of powder. Most of this work is checked by visual inspection. When it is found that the powder is not evenly or finely sprayed, it should be adjusted in time. In case of improper use or other reasons, the powder spraying device may sometimes have powder block or even block fault. Good routine maintenance and correct use can avoid or reduce the blockage of the duster.
The above is the introduction of Jinan label printing company. If you want to know more, please visit the website: http://www.zhongguoyingyou.com