Folding: Folding is the working process of folding printed sheets into book stickers with the size of books and periodicals in the order of page numbers, or folding large-format printed sheets into certain specifications and formats as required. Folding is an essential process in the printing industry. The large format paper printed by printing machine must be folded to form products, such as newspapers, books, magazines, sample advertisements and so on.

Insert: refers to the number of pages inserted into the book block to supplement its content because of the need of the number of words in the book block and the arrangement of charts.

Bleeding page: a printed page outside the center of the printing plate. Color bleeding in printing refers to the pattern that increases the external size of the product, and some pattern extensions are added at the cutting position, which are specially used in each production process within its process tolerance, so as to avoid white edges or cut content in the cut finished product.