According to the relationship between plate and substrate, there are two main printing methods: pressure printing and non pressure printing.
Contact imprinting is a kind of printing technology that uses plate or other means to transfer the graphic information on the original to the substrate according to the pressure effect. Contact printing is also a traditional printing method. It uses printing ink or pigment to copy images and words on the surface of paper or other materials through printing machine. According to the printing process, the printing process generally includes five elements: original, plate, substrate, ink, printing machine, etc.
From the perspective of plate form, contact printing mainly includes relief printing, gravure printing, lithography and pass printing. According to different printing processes, the above four printing methods are also different from direct printing and indirect printing. There are also different classification habits in the application field. China is generally divided into printing and printing, publishing and printing (including books and periodicals), packaging and decoration printing, Securities printing, stationery printing and parts printing.
Non contact printing, also known as non pressure printing, is a kind of printing technology based on non pressure effect. It is a new printing method with the development of computer output technology. It uses computer-controlled thermal, electrostatic, magnetic or inkjet technology to deliver toner or ink drops to the substrate surface instead of using traditional plates. Or make the paper color special, forming a clear picture and text. Contactless printing is characterized by reliable operation, no noise, compact equipment, fast speed, convenient operation and wide application. It is especially suitable for hard copy output of office environment and information network system.
Non pressure printing includes laser (electrostatic) printing, ink-jet printing, thermal printing and magnetic printing. Among them, the first two methods are widely used in the field of non printing.