In printing, there are many processes that take place. For example, offset printing uses offset presses that press paper with raised surfaces, such as metal plates or wooden blocks. In addition, printing also uses a process called block printing, which utilizes a raised surface and cuts away lignin from the paper. The result is a high-contrast image that is sometimes referred to as line art or line work.
Some processes are environmentally friendly, like vegetable oil inks. The printing process also uses a special type of glue to create books and other products. Some of these processes also produce waste. For example, when printing on a sheet of paper, unwanted holes can occur. Some of these holes can be used as registration marks on printing plates or separations.
During the medieval period, printing was a popular form of publishing. It made it possible to reproduce books in a mass amount. Previously, books were copied one by one. However, with the invention of the printing press, books could be printed in thousands instead of just a few hundred. Today, newspapers are increasingly being distributed online, but books still hold a place in our lives.
The earliest form of printing is called letterpress. Unlike offset printing, this process uses semi-liquid inks. In addition, this method is fast and inexpensive. It is also suitable for printing on uneven surfaces.