At present, the method of printing plate making is mainly divided into two major categories: metal plate and resin plate. The metal plate is produced in a similar way to gravure printing. The metal etching plate and the metal engraving plate are used. The metal etching plate uses an acidic solution to corrode the picture and text. Into the cavities, this method will produce harmful gases and liquid waste, causing serious pollution to the environment, there is a trend of being eliminated, but due to its low cost, easy to grasp the operation process, it is still widely used by printing manufacturers; metal engraving version It is a computer-controlled engraving knife or laser that directly engraves or burns graphic parts on the metal plate. The effect is very good and there is no harmful substance emission. It is an environmentally friendly process, but the cost is high, and the shift is It is hard for Indian manufacturers to accept it. The common feature of the metal plate is that the printing rate is high and large orders can be completed.
The resin plate is precoated with a nylon photosensitive resist on a metal plate, and the non-graphic part is cured by exposure, and then the unexposed photosensitive adhesive of the graphic part is washed out with water and alcohol to make a gravure plate. The nylon photosensitive adhesive not only has wear resistance, but also It can repeatedly rub the scraper, and it can also reproduce the fine dots and print beautiful patterns. Compared with the metal plate, the printing rate is lower and the printing machine's accuracy is higher. Domestic use is not much.
According to the characteristics of metal engraving plates and resin plates, the author tried to find a new plate-making method because of the characteristics of the resin plate and the resin plate. Due to the limited theoretical knowledge and practical experience, the feature was discussed with interested friends.
The practice is: using engraving machines to pre-engrave on the metal plate with a certain number of lines in the same size, the depth of the same network of holes, the first use of nylon sensitized plastic blocking the full version of the network point, and then scraped with a squeegee, Wait until it is dry before painting and then scrape it several times, so that the dried photoresist is flush with the net wall, and then the negative film is released. The non-graphic part of the photosensitive adhesive still remains in the cell after curing. It can prevent the ink from entering during printing. The part of the photosensitive adhesive can be washed out and the net point can be cleared. When printing, the ink can enter, and the net wall between the net points can be cured. The photosensitive resist can protect the printing ink and greatly increase the printing rate of the printing plate. When an order is completed, the cured photosensitive adhesive can be removed and reused. This way, only a small amount of photosensitive adhesive is consumed for each plate making process. Diluting the cost of plate making and ensuring the quality of printing is really a best of both worlds. Of course, the emergence of any new kind of thing will be accompanied by new problems. Human beings are making progress in discovering and solving problems.
Source of information: China Screen Printing Industry Network