Screen printing is not only suitable for general paper printing, but also has a wide range of adaptability. For example: ceramics, glass, printed circuit board, etc. According to the texture of the substrate, the printing is different. Although each series has an inseparable internal relationship, they have their own particularity due to the different substrate (i.e. different chemical and physical properties). Therefore, it is usually divided into several categories according to different substrates: paper printing, plastic printing, ceramic printing, glass printing, circuit board printing, metal printing, textile printing and so on. Thus, a relatively independent printing system is formed.