Introduction to the process flow of printing machine

2024-10-25 10:49:21

There are many ways to apply ink to etching platesThere are many ways to apply ink to etching plates. The ink is first sprayed onto the etching plate, and then the excess ink is scraped off with a retractable squeegee. At this point, the solvent left in the ink in the etched area evaporates and forms a gelatinous surface, and then the glue head descends onto the etching plate and absorbs the ink.

The glue head of the ink absorbing and printing products rises after absorbing most of the ink on the etching plate, at this time, this layer of ink volatilizes a part, and the remaining part of the undried ink surface is more conducive to the close combination of the printed object and the glue head. The head should be shaped in such a way that it produces a rolling motion to remove excess air from the surface of the etching plate and ink.

In the generation process, the ideal situation is that all the ink on the etching plate is transferred to the printed object, and in the generation process (close to 10 microns or 0.01 mm thick ink adheres to the substrate and is transferred to the substrate) the glue head printing is easily affected by air, temperature, static electricity, etc. If the evaporation rate and dissolution rate are controlled in equilibrium throughout the entire process from etching plate to transfer head to substrate, then successful printing is achieved. If it evaporates too quickly, the ink will dry up before it can be absorbed. If the evaporation is too slow, the surface of the ink has not yet formed a gelatinous form, and it is not easy for the glue head to adhere to the substrate.   There are several main etching substrates for etching plates: 1. Thick steel plate 2. Thin steel plates 

3. Plastic photopolymer panels (photosensitive) As far as any image is concerned, they are generated by photographic methods. First, a positive image of the photographic object is made with a photosensitive emulsion, and then the positive film is placed on the board. The plate has been coated with a photosensitive layer, and when exposed under ultraviolet light, there is no image area hardening. Then, the photosensitive material in the image area is washed away (the plastic photopolymer board is cleaned with a mixture of water and alcohol) and finally dried.

This high-quality etching plate making equipment is inexpensive, costing about 3,000 yuan to manufacture according to customer requirements. In the case of metal plates, once the photosensitive material in the image area has been washed away, the metal plate is placed in a corrosive material such as ferric chlorate or hydrochloric acid, etched, and careful handling is required. Whether you use a thick or thin steel sheet, or a plastic photopolymer plate, depends on the printer. Thick steel plates are most suitable for production, but the printing quality is poor; Thin steel plate is different from thick steel plate, which is usually pre-coated with a layer of photosensitive emulsion, which is more practical; However, plastic photopolymer panels have the best printing quality of the three, but they are the worst in terms of production. The depth and quality of the etch are very important. If the depth is not right, the image will be poor. If you use a defective inferior steel plate, then the print will reflect it.

Silicone transfer headsTransfers are made of flexible silicone and can be made into many different shapes. Its function is to take the pattern from the etching plate and transfer the pattern to the substrate. The ability of the transfer head to absorb ink and its printing quality are affected by the following four factors: 1. The shape of the transfer head 2. The hardness of the transfer head